CN101405950B - Base station, communication terminal, transmission method and reception method - Google Patents
Base station, communication terminal, transmission method and reception method Download PDFInfo
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Abstract
A base station includes: means configured to manage frequency blocks; means configured to determine, for each frequency block, scheduling information for assigning one or more resource blocks to a communication terminal being in a good channel state; means configured to generate a control channel including the scheduling information for each frequency block; and means configured to frequency multiplexing control channels within the system frequency band and to transmit it. In addition, the base station transmits the control channel by separating a non-specific control channel to be decoded bya non-specific communication terminal and a specific control channel to be decoded by a communication terminal to which one or more resource blocks are assigned.
Description
Technical field
The present invention relates to technical field of wireless communication, particularly the base station of in the communication system of carrying out frequency scheduling and multi-carrier transmission, using, communication terminal, sending method and method of reseptance.
Background technology
In this technical field, the wireless access in broadband that be used for to realize carrying out effectively the communication of high-speed high capacity becomes day by day important.Especially in down channel, the time carry out the viewpoint of the communication etc. of high-speed high capacity from suppressing the multipath decline effectively, multi-carrier mode-more particularly, OFDM (OFDM:Orthogonal Frequency Division Multiplexing) mode-be regarded as promising.And, from improving the viewpoint that frequency utilization efficient improves throughput etc., in system of future generation, also proposed to carry out the mode of frequency scheduling.
As shown in Figure 1, spendable frequency band is split into a plurality of Resource Block (being divided into three in illustrated embodiment) in system, and each Resource Block comprises more than one subcarrier.Resource Block is also referred to as frequency chunks (chunk).In terminal, distributed more than one Resource Block.Frequency scheduling is, received signal quality or channel condition information (CQI:Channel Quality Indicator) according to each Resource Block of the downlink pilot frequency channel of being reported from terminal, to the good terminal of channel status distributes resource blocks preferentially, to improve efficiency of transmission or the throughput of entire system.Under the situation of carrying out frequency scheduling, the context notification of scheduling need be arrived terminal, this notice is to be undertaken by control channel (be also referred to as L1/L2 control signaling channel, follow control channel, low layer control channel etc.).In addition, use this control channel, (for example also be sent in the modulation system used in the Resource Block that is scheduled, QPSK, 16QAM, 64QAM etc.), chnnel coding information (for example, channel encoding rate etc.), and then also send mixed automatic retransmission request (HARQ:Hybrid Auto Repeat ReQuest).For frequency band being divided into a plurality of Resource Block, each Resource Block is changed the technology of modulation system, for example be documented in P.Chow, J.Cioffi, J.Bingham, " A Practical Discrete Multitone Transceiver Loading Algorithm for Data Tran smission over Spectrally Shaped Channel ", IEEETrans.Commun.vol.43, No.2/3/4 is among the February/March/April 1995.
Summary of the invention
The problem that invention will solve
On the other hand, in wireless access way of future generation in the future, perhaps require to prepare the various frequency bands of width, terminal can be utilized various frequency bands according to place or purposes.At this moment, the receivable bandwidth of terminal also can be prepared the various frequency bands of width according to purposes or price.At this moment, if suitably carry out frequency scheduling, also can expect the raising of frequency utilization efficient and throughput.But, because of will be in communication system in the past spendable frequency band be that the frequency band that is fixed is as prerequisite, do not prepared under the situation of the various frequency bands of width in base station side and end side so also have to establish, all allowed on the basis of all combinations, the content of scheduling has suitably been notified terminal or user's concrete grammar.
On the other hand, suppose to divide regularly at certain public specific Resource Block of all terminals to be used in control channel, then the channel status of general terminal is to each Resource Block difference, so exist according to terminal different and can not receive the misgivings of control channel well.In addition, all Resource Block are being disperseed under the situation of control channel, might which terminal can both receive control channel with the quality of reception to a certain degree, but be difficult to expect the higher quality of reception.Therefore, expectation is transferred to terminal more in high quality with control channel.
In addition, under the situation of carrying out Adaptive Modulation and Coding (the AMC:Adaptive Modulation and Coding) control that modulation system and channel encoding rate changed adaptively, be used for transmitting control channel required code element number to each terminal difference.This is because each code element institute information transmitted amount is according to the combination of AMC and difference.In addition, in system in the future, a plurality of antennas of also having discussed by preparing respectively at transmitter side and receiver side send the mode that receives different signals.At this moment, by each signal of being communicated by letter, may need the above-mentioned control information of schedule information etc. by each antenna.Therefore, at this moment, be used for transmitting control channel required code element number, be not only each terminal change, might also change according to the antenna number that is used for terminal.Should by control channel information transmitted amount to the different situation of each terminal under, in order to use resource effectively, just need utilization can tackle the variable format of the change of control information amount neatly, but can increase the weight of the signal processing burden of transmitter side and receiver side like this.On the contrary, under the situation that form is fixed, need be complementary to guarantee the field of control channel special use with maximum fault information.But like this, even produced the space in the field of control channel special use, that a part of resource can not be utilized in transfer of data, violates the requirement of efficent use of resources.Therefore, expectation transmitting control channel simply and expeditiously.
The present invention is in order to tackle at least one of the problems referred to above point, its problem is, provide a kind of in communication system, for to the different various terminals of the bandwidth that can communicate by letter base station, communication terminal, sending method and the method for reseptance of transmitting control channel effectively, wherein, the frequency band of distributing to communication system is split into a plurality of frequency chunks, and each frequency chunks comprises a plurality of Resource Block that comprise more than one subcarrier, and terminal uses more than one frequency chunks to communicate.
Be used for solving the means of problem
Use in communication system the base station of using in a mode of the present invention, and the frequency band that offers communication system comprises a plurality of frequency chunks, and each frequency chunks comprises a plurality of Resource Block that comprise more than one subcarrier.The base station communicates with the communication terminal that uses more than one frequency chunks.The base station comprises: the parts of the corresponding relation between the frequency chunks that is used for managing the bandwidth of communicating by letter of each communication terminal and distributing to communication terminal; Each frequency chunks is determined to be used for the frequency scheduling device of more than one resource block assignments to the schedule information of the good communication terminal of channel status; Each frequency chunks is generated the parts of the control channel that comprises schedule information; To in offering the frequency band of communication system, carry out the reusable component of software of channeling to the control channel that each frequency chunks generates; And the parts that the output signal of reusable component of software is sent with multi-carrier mode.
The base station of a mode of the present invention is the base station of carrying out the multi-carrier mode of frequency scheduling in the frequency band that comprises a plurality of Resource Block that comprise more than one subcarrier.This base station comprises: the frequency scheduling device based on the channel condition information of reporting from each communication terminal, determines to be used for the schedule information of more than one resource block assignments to the good communication terminal of channel status; Comprise the coding of control channel of not specific control channel and specific control channel and the parts of modulation, described not specific control channel is that described specific control channel is to be assigned with the particular communication decoding terminals of more than one Resource Block at particular communication decoding terminals not; According to schedule information, not specific control channel and specific control channel are carried out time-multiplexed reusable component of software; Send the parts of the output signal of described reusable component of software with multi-carrier mode.
The base station of a mode of the present invention is the base station of carrying out the multi-carrier mode of frequency scheduling in the frequency band that comprises a plurality of Resource Block that comprise more than one subcarrier.The base station comprises: the frequency scheduling device based on the channel condition information of reporting from each communication terminal, determines to be used for the schedule information of more than one resource block assignments to the good communication terminal of channel status; According to schedule information, control channel and data channel are carried out multiplexing reusable component of software; Send the parts of the output signal of described reusable component of software with multi-carrier mode.Decoded control channel is mapped in the described frequency band that comprises a plurality of Resource Block dispersedly by the particular communication terminal.
The base station of a mode of the present invention is the base station of carrying out the multi-carrier mode of frequency scheduling in the frequency band that comprises a plurality of Resource Block that comprise more than one subcarrier.The base station comprises: the frequency scheduling device based on the channel condition information of reporting from each communication terminal, determines to be used for the schedule information of more than one resource block assignments to the good communication terminal of channel status; According to schedule information, control channel and data channel are carried out multiplexing reusable component of software; Send the parts of the output signal of described reusable component of software with multi-carrier mode.Decoded control channel is mapped in the Resource Block of distributing to this particular communication terminal with being defined by the particular communication terminal.
The base station of a mode of the present invention is the base station of carrying out the multi-carrier mode of frequency scheduling in the frequency band that comprises a plurality of Resource Block that comprise more than one subcarrier.The base station comprises: the frequency scheduling device based on the channel condition information of reporting from each communication terminal, determines to be used for the schedule information of more than one resource block assignments to the good communication terminal of channel status; Comprise the coding of control channel of not specific control channel and specific control channel and the parts of modulation, described not specific control channel is that described specific control channel is to be assigned with the particular communication decoding terminals of more than one Resource Block at particular communication decoding terminals not; According to schedule information, not specific control channel and specific control channel are carried out time-multiplexed reusable component of software; And the parts that send the output signal of described reusable component of software with multi-carrier mode.Described not specific control channel comprises for representing this not information of the transformat of specific control channel.
The invention effect
According to the present invention, comprise in the communication system of a plurality of Resource Block that comprise more than one subcarrier that in each frequency chunks of a plurality of frequency chunks of construction system frequency band can be to the bandwidth that can communicate by letter different various communication terminals are transmitting control channel effectively.
Description of drawings
Fig. 1 is the figure for the explanation frequency scheduling.
Fig. 2 is the figure that represents the frequency band that uses in one embodiment of the invention.
Fig. 3 A represents the part block diagram (1) of the base station of one embodiment of the invention.
Fig. 3 B represents the part block diagram (2) of the base station of one embodiment of the invention.
Fig. 4 A is the figure of the expression signal processing key element relevant with frequency chunks.
Fig. 4 B is the figure that the expression signal relevant with control channel handled key element.
Fig. 4 C is the figure that the expression signal relevant with control channel handled key element.
Fig. 4 D is the figure that the expression signal relevant with control channel handled key element.
Fig. 4 E is the figure of the expression signal processing key element relevant with frequency chunks.
Fig. 5 A is the figure of the information project example of expression control signaling channel.
Fig. 5 B is the figure of the centralized FDM mode of expression and distributing FDM mode.
Fig. 5 C is the figure of the L1/L2 control channel that changes according to while users multiplexing number of expression code element number.
Fig. 6 is the figure of the unit of expression error correction coding.
Fig. 7 A is the figure of the mapping example of expression data channel and control channel.
Fig. 7 B is the figure of the mapping example of expression data channel and control channel.
Fig. 7 C is the figure of the form example of expression L1/L2 control channel.
Fig. 7 D is the figure of the form example of expression L1/L2 control channel.
Fig. 7 E is the figure of the mapping example of the L1/L2 control channel in 3 sector strucres of expression.
Fig. 7 F is the not figure of the multiplex mode of specific control channel of illustration.
Fig. 7 G is the figure of the mapping example of expression data channel and control channel.
Fig. 7 H is the figure of the mapping example of expression data channel and control channel.
Fig. 7 I is the figure of the mapping example of expression data channel and control channel.
Fig. 7 J is the figure of expression situation that the user in the residential quarter is divided into groups.
Fig. 8 A is the part block diagram of the terminal of expression one embodiment of the invention.
Fig. 8 B is the part block diagram of the terminal of expression one embodiment of the invention.
Fig. 8 C represents the block diagram relevant with the receiving element of terminal.
Fig. 9 is the flow chart of the action example of expression one embodiment of the invention.
Figure 10 A is the figure of the relation of expression error checking object and chnnel coding unit.
Figure 10 B is the figure of the relation of expression error checking object and chnnel coding unit.
Figure 10 C is the figure of the relation of expression error checking object and chnnel coding unit.
Figure 10 D is that expression is for the figure of the method example of the amount of information of cutting down the transmitting uplink data related information.
Figure 10 E is the figure of the action example of expression when carrying out the situation of frequency frequency hopping.
Figure 11 is the flow chart of action example of expression one embodiment of the invention and the figure of frequency band.
Figure 12 is other action flow charts of examples of expression one embodiment of the invention and the figure of frequency band.
Figure 13 is the figure that the situation of TPC is carried out in expression.
Figure 14 is the figure that the situation of AMC control is carried out in expression.
Label declaration
31 frequency chunks assignment control
32 frequency scheduling unit
The control signaling channel generation unit of 33-x in frequency chunks x
The data channel generation unit of 34-x in frequency chunks x
35 broadcast channels (perhaps calling channel) generation unit
The 1st Multiplexing Unit that 1-x is relevant with frequency chunks x
37 the 2nd Multiplexing Units
38 the 3rd Multiplexing Units
39 other channel generation units
40 inverse fast fourier transform unit
41 Cyclic Prefix extra cells
41 not specific control channel generation units
42 specific control channel generation units
43 Multiplexing Units
81 carrier frequency tuned cells
82 filter units
83 Cyclic Prefix delete cellses
84 fast Fourier transform unit (FFT)
The 85CQI determination unit
86 broadcast channel decoding units
The not specific control channel of 87-0 (part 0) decoding unit
87 not specific control channel decoding units
88 specific control channel decoding units
89 data channel decoding units
Embodiment
In a mode of the present invention, each frequency chunks is carried out frequency scheduling, the control channel and the minimum bandwidth that are used for the notice schedule information generate each frequency chunks matchingly.Like this, can be to the bandwidth that can communicate by letter different various communication terminals are transmitting control channel effectively.Communication terminal generally is portable terminal or travelling carriage, but also can be fixed terminal or fixed station.Communication terminal also can be called as user's set.
The control channel that each frequency chunks is generated also can be according to the rules frequency-hopping mode by channeling.Like this, can be implemented in the homogenizing of the communication quality between the communication terminal and between the frequency chunks.
Can send broadcast channel with the frequency band of bandwidth with a frequency chunks amount, described frequency band is the frequency band that comprises the centre frequency of the frequency band that offers communication system.Like this, no matter be which communication terminal of wanting to have access to communication system, near the signal of the lowest-bandwidth can both the receiving center frequency, thus can be connected to communication system simply.
Also can send calling channel with the frequency band of bandwidth with a frequency chunks amount, described frequency band is the frequency band that comprises the centre frequency of the frequency band that offers communication system.Like this, can mate to receive and wait the frequency acceptance band of biding one's time and the frequency band that carries out Cell searching, better from the viewpoint that reduces frequency harmony number of times as far as possible.
From the viewpoint of service band integral body equably, the frequency chunks that the calling channel that is used for the call communication terminal also can be assigned to this communication terminal sends.
In a mode of the present invention, control channel is divided at the decoded not specific control channel of particular communication terminal not with at the decoded specific control channel of the particular communication terminal of having distributed more than one Resource Block, and they can be encoded respectively and modulate.Control channel carries out not specific control channel and specific control channel according to schedule information time-multiplexed, is sent out by multi-carrier mode.Like this, even in the control information amount difference of each communication terminal, also can be with set form transmitting control channel and can not waste resource effectively.
Not specific control channel is mapped in the universe of frequency chunks dispersedly, and the specific control channel relevant with a certain particular communication terminal also can be defined and be mapped in the Resource Block of distributing to this particular communication terminal.The quality of specific control channel not can be guaranteed in all users for more than certain, simultaneously the quality of specific control channel is improved.This be because specific control channel be mapped to for the particular communication terminal separately the good Resource Block of channel status.
The pilot channel of down link also can be mapped in a plurality of Resource Block of distributing to a plurality of communication terminals dispersedly.By pilot channel is shone upon, thereby can improve precision of channel estimation etc. in broadband.
In a mode of the present invention, from keeping or improve the viewpoint of the quality of reception of the control channel that comprises not specific and specific control channel, not specific control channel is carried out transmission power control, specific control channel is carried out a side or the both sides of transmission power control and Adaptive Modulation and Coding control.
Also can carry out the not transmission power control of specific control channel, make the particular communication terminal that has been assigned with Resource Block can receive not specific control channel in high quality.This is that all users or the communication terminal of specific control channel have the obligation of attempting demodulation because received not, but the final actual user who has been assigned with Resource Block successfully gets final product in demodulation.
Also can in not specific control channel, comprise modulation system and a side of coded system or both sides' the information that is applicable to specific control channel.The modulation system that is fixed for not specific control channel and the combination of coded system are fixed, so by the not specific control channel of the user who has distributed Resource Block is carried out demodulation, thereby can obtain the information of the modulation system relevant with specific control channel and coded system etc.Thus, in control channel, can carry out Adaptive Modulation and Coding control to the part of specific control channel, can improve the quality of reception of this part.
Under the situation of control channel being carried out the control of transmission power control and Adaptive Modulation and Coding, be used for the modulation system of specific control channel and the combination sum of coded system and also can prepare to such an extent that be less than for the modulation system of sharing data channel and the combination sum of coded system.Even this is because can't reach desired qualities by the control of Adaptive Modulation and Coding, as long as can reach desired qualities by transmission power control.
Fig. 2 represents the frequency band that uses in one embodiment of this invention.For convenience of explanation, use concrete numerical value, but numerical value is a simple example, also can use various numerical value.The frequency band (whole transmission frequency band) that offers communication system has the bandwidth of 20MHz as an example.This whole transmission frequency band comprises four frequency chunks 1～4, and each frequency chunks comprises a plurality of Resource Block that contain more than one subcarrier.In illustrated embodiment, be shown schematically in the situation that contains a plurality of subcarriers in each frequency chunks.In the present embodiment, prepared 5MHz, 10MHz, 15MHz and 20MHz as the bandwidth that communicates four kinds, terminal is used more than one frequency chunks, communicates by any bandwidth in four.The terminal that communicates in communication system may can communicate by any frequency band in four, also might communicate in certain bandwidth.But need can communicate in the bandwidth of 5MHz at least.Perhaps, also can not prepare the frequency band of so much kind, make any communication terminal in the universe of system bandwidth, to communicate and decide by standard.In order more generally to illustrate, in following embodiment, the situation of the option of having prepared four kinds of bandwidth has been described.But also can understand the option that is with or without such bandwidth and can both adapt to the present invention.
In the present embodiment, the control channel (L1/L2 control signaling channel or low layer control channel) that arrives terminal for the scheduling context notification with data channel (sharing data channel) constitutes with minimum bandwidth (5MHz), and control channel is prepared in each frequency chunks independently.For example under the situation that the terminal that the bandwidth with 5MHz communicates communicates by frequency chunks 1, may be received in the control channel of preparing in the frequency chunks 1, obtain the content of scheduling.Can communicate by which frequency chunks for terminal, for example also can use broadcast channel to prenotice.In addition, also can be after the communication beginning, the frequency chunks that change is used.Under the situation that the terminal that the bandwidth with 10MHz communicates communicates by frequency chunks 1 and 2, terminal is used two frequency chunks of adjacency, be received in frequency chunks 1 and 2 both sides' that prepare control channel, can obtain the content in the scheduling of the scope of 10MHz.The terminal that communicates in the bandwidth with 15MHz is used three frequency chunks of adjacency, under frequency chunks 1,2 and 3 situations about communicating, terminal is received in the frequency chunks 1,2 and 3 all control channels of preparing, can obtain the content in the scheduling of the scope of 15MHz.All be received in the control channel of preparing in all frequency chunks in the terminal that the bandwidth with 20MHz communicates, can obtain the content in the scheduling of the scope of 20MHz.
Among the figure, represented four discrete pieces about control channel in frequency chunks, its expression control channel disperses to be mapped to the situation in a plurality of Resource Block in this frequency chunks.Concrete mapping example for control channel is narrated in the back.
Fig. 3 A represents the part block diagram of the base station of one embodiment of the invention.In Fig. 3 A, drawn frequency chunks assignment control 31, frequency scheduling unit 32, control signaling channel generation unit 33-1 in frequency chunks 1 and data channel generation unit 34-1, ... the control signaling channel generation unit 33-M in frequency chunks M and data channel generation unit 34-M, broadcast channel (perhaps calling channel) generation unit 35, the 1st Multiplexing Unit 1-1 of relevant frequency chunks 1, ... the 1st Multiplexing Unit 1-M of relevant frequency chunks M, the 2nd Multiplexing Unit 37, the 3rd Multiplexing Unit 38, other channel generation units 39, inverse fast fourier transform unit 40 (IFFT) and Cyclic Prefix (CP) extra cell 41.
Frequency chunks assignment control 31 is confirmed the employed frequency chunks of this terminal based on the information relevant with the maximum bandwidth of reporting from terminal (also can be portable terminal, also can be fixed terminal) of communicating by letter.Corresponding relation between frequency chunks assignment control 31 each terminals of management and the frequency chunks, and give frequency scheduling unit 32 with its context notification.For can by which frequency chunks communicating in the terminal of certain bandwidth communication, also can pass through broadcast channel broadcasts in advance.For example broadcast channel also can also can be limited to wherein any for the use with any frequency band of user's authorized frequency piece 1,2,3,4 of the bandwidth communication of 5MHz.In addition, for the user with the bandwidth communication of 10MHz, the combination of two frequency chunks that permission to use frequency chunks (1,2), (2,3) or (3,4) are adjacent like this.Also can permit the use that these are all, perhaps also use can be limited to any combination.For the user with the bandwidth communication of 15MHz, the combination of three adjacent frequency chunks that permission to use frequency chunks (1,2,3) or (2,3,4) are such.Also can permit two sides' use, perhaps also can be limited to a side combination.User for the bandwidth communication of 20MHz uses all frequency chunks.As described later, the frequency-hopping mode that spendable frequency chunks also can be according to the rules changes after the communication beginning.
Control signaling channel generation unit 33-1 in frequency chunks 1 is the Resource Block in the frequency of utilization piece 1 only, is configured for the schedule information in the frequency chunks 1 is notified the control signaling channel of terminal.Other frequency chunks is only used the Resource Block in this frequency chunks also in the same manner, is configured for the schedule information in this frequency chunks is notified the control signaling channel of terminal.
Data channel generation unit 34-1 in frequency chunks 1 generates the data channel of the more than one Resource Block transmission in the frequency of utilization piece 1.Frequency chunks 1 can be shared by more than one terminal (user), so prepared N data channel generation unit 1-1～N in illustrated embodiment.For other frequency chunks also in the same manner, generate to share the data channel of the terminal of this frequency chunks.
About the 1st Multiplexing Unit 1-1 pair of frequency chunks 1 signal relevant with frequency chunks 1 carries out multiplexing.This multiplexing channeling that comprises at least.Control signaling channel and data channel be multiplexing narration in the back by how.Other the 1st Multiplexing Unit 1-x carries out multiplexing to control signaling channel and data channel by frequency chunks x transmission also in the same manner.
The 2nd Multiplexing Unit 37 carry out according to the rules frequency-hopping mode change various Multiplexing Unit 1-x (x=1 ..., M) frequency axis on the action of position relation, but describe in the 2nd embodiment for this function.
Broadcast channel (perhaps calling channel) generation unit 35 generation station data (office data) etc. are used for notice to the broadcast message of subordinate's terminal.In control information, also can comprise for the maximum band of communicating by letter of expression terminal and the information of the relation between the spendable frequency chunks of this terminal.Change under the various situations in spendable frequency chunks, in broadcast message, also can comprise the information that is used to specify its frequency-hopping mode how to change of expression.In addition, calling channel can send by the frequency band identical with broadcast channel, also can send by the frequency chunks of using in each terminal.
The channel that other channel generation units 39 generate outside control signaling channel and the data channel.For example other channel generation units 39 generate pilot channel.Pilot channel or pilot signal are at transmitter side and the known suitable any signal of receiver side, also can be called as benchmark (reference) signal, contrast signal, known signal, preparation (training) signal etc.
The 3rd Multiplexing Unit 38 carries out multiplexing to the control signaling channel of each frequency chunks and data channel and broadcast channel and/or other channel as required.
The 40 pairs of signals from 38 outputs of the 3rd Multiplexing Unit in inverse fast fourier transform unit carry out inverse fast fourier transform, and carry out the modulation of OFDM mode.
Code element supplementary protection after the modulation of 41 pairs of OFDM modes of Cyclic Prefix (CP) extra cell generates and sends code element at interval.Sending code element for example also can be attached to beginning (perhaps end) by a series of data with the end (perhaps starting) of OFDM code element and generate.
Fig. 3 B is illustrated in CP extra cell 41 element afterwards of Fig. 3 A.As shown in the figure, be attached and protected code element at interval processing through digital-to-analogue conversion, frequency translation and frequency band limits etc. in the RF transtation mission circuit, in power amplifier, be enlarged into suitable power, sent via duplexer and transmission/reception antennas.
Though optional in the present invention, when receiving, carry out in the present embodiment receiving by the antenna diversity of two antennas.The upward signal that is received by two antennas is imported into the upward signal receiving element.
Fig. 4 A represents the signal processing key element relevant with a frequency chunks (X frequency chunks).X is more than 1 and the following integer of M.Substantially, the control signaling channel generation unit 33-x of relevant frequency chunks x and data channel generation unit 34-x, Multiplexing Unit 43-A, B, Multiplexing Unit 1-x have been represented.Control signaling channel generation unit 33-x comprises not specific control channel generation unit 41 and more than one specific control channel generation unit 42-A, B.......
Not specific control channel generation unit 41 is among the control signaling channel, must decode and the part of the not specific control channel (also can be called as not specific control information) of demodulation is carried out chnnel coding and multistage modulation to all terminals of using this frequency chunks, and with its output.
Specific control channel generation unit 42-A, B...... are among the control signaling channel, must decode and the part of the specific control channel (also can be called as specific control information) of demodulation is carried out chnnel coding and multistage modulation to the terminal that in its frequency chunks, has been assigned with more than one Resource Block, and with its output.
Data channel generation unit x-A, B...... carry out respectively for the chnnel coding of the data channel that mails to each terminal A, B...... and multistage modulation.The information relevant with this chnnel coding and multistage modulation is included in the above-mentioned specific control channel.
Multiplexing Unit 43-A, B...... be to being assigned with each terminal of Resource Block, with specific control channel and data channel corresponding to Resource Block.
As mentioned above, for the coding of specific control channel not (and modulation) in not specific control channel generation unit 41, carry out, carry out respectively in specific control channel generation unit 42-A, B...... for the coding (and modulation) of specific control channel.Therefore, as among Fig. 6 conceptually shown in, in the present embodiment, not specific control channel comprises the information of the user crew amount that has been assigned with frequency chunks x, they become the object of error correction coding together.
In other embodiment, not specific control channel also can carry out error correction coding to each user.At this moment, each user can't determine uniquely the information of this TV station is included in respectively by in which piece of the piece of error correction coding, so need decode to all pieces.In these other embodiment, the processing of coding is sealed each user, so the appending and change than being easier to of user.Each user need decode to the not specific control channel of user crew's amount, demodulation.
With respect to this, specific control channel only comprises the information that is associated with the actual user who has been assigned with Resource Block, and each user is carried out error correction coding.By not specific control channel is decoded and demodulation, distinguish whom the user who has been assigned with Resource Block is.Therefore, specific control channel need not the crew and decodes, and the user who only has been assigned with Resource Block decodes and gets final product.In addition, suitably changed in communication for channel encoding rate and the modulation system of specific control channel, but for channel encoding rate and the modulation system of specific control channel can not be fixed yet.But in order to ensure certain above signal quality, transmission power control (TPC) is carried out in expectation.Specific control channel transmits by good Resource Block on the basis that has been implemented error correction coding.Therefore, also can be by deleting (puncturing) minimizing downlink data amount to a certain degree of cutting.
Fig. 5 A represents the kind of descending control signaling channel and an example of information project.In the descending control signaling channel, comprise broadcast channel (BCH), special-purpose L3 signaling channel (upper strata control channel or high-rise control channel) and L1/L2 control channel (low layer control channel).In the L1/L2 control channel, not only can comprise the information for downlink data transmission, also can comprise the information for transmitting uplink data.Below, diagrammatic illustration is by each channel information transmitted project.
(broadcast channel)
Broadcast channel is used for will be in the residential quarter constant information or notifies communication terminal (can be that portable terminal also can be fixed terminal, also can be called as user's set) with the information that low speed changes.For example can be used as broadcast message and notify with the information of the variation of the cycle about 1000ms (1 second).In broadcast message, also can comprise the transformat of descending L1/L2 control channel, distribute maximum number of user, Resource Block configuration information and MIMO mode information simultaneously.
Transformat can be determined by data modulation system and channel encoding rate.Also can the notification data size replace channel encoding rate.This is because can derive channel encoding rate uniquely according to data modulation system and size of data.
Distribute maximum number of user to be illustrated in 1TTI simultaneously and use that FDM, CDM and TDM's can carry out multiplexing maximum number more than one.This number can be identical in up channel and down channel, also can be different.
The Resource Block configuration information is for the frequency of the Resource Block of determining to use in this residential quarter, the information of position on time shaft.In the present embodiment, as frequency division multiplexing (FDM) mode, can utilize the dual mode of centralized (localized) FDM mode and distributing (distributed) FDM mode.In centralized FDM mode, on the frequency axis partly the user priority ground of good channel status distribute continuous frequency band.This mode is favourable for mobile degree little user's communications or high-quality and large-capacity data transmission etc.In distributing FDM mode, generate downstream signal, make in broadband, to have a plurality of frequency components by spells.This mode is favourable for transfer of data of the such periodicity of the big user's communications of mobile degree or packets of voice (VoIP) and little size of data etc.No matter make in any way, frequency resource is carried out resource and is distributed according to information that be used for to determine continuous frequency band or a plurality of discrete frequency component.
Shown in the upside of Fig. 5 B, for example resource is confirmed as under the situation of " the 4th " in centralized FDM mode, uses the resource of Physical Resource Block numbers 4.In distributing FDM mode such shown in the downside of Fig. 5 B, resource is confirmed as under the situation of " the 4th ", uses Physical Resource Block 2, two left-half of 8.In illustrated embodiment, a Physical Resource Block is split into two.Label in distributing FDM mode adds or cuts apart number can be to each residential quarter difference.Therefore, the Resource Block configuration information is notified communication terminal in the residential quarter by broadcast channel.
Prepare to have under the situation of a plurality of antennas in the base station, which of Single User MIMO (SU-MIMO:Single User-Multi Input Multi Output) mode or multiuser MIMO (MU-MIMO:Multi-User MIMO) mode be MIMO mode information represent to carry out.The SU-MIMO mode is a mode that communication terminal communicates with a plurality of antennas, and the MU-MIMO mode is the mode that a plurality of communication terminals with an antenna communicate simultaneously.
(special-purpose L3 signaling channel)
Special-purpose L3 signaling channel also is used for and will notifies communication terminal with the information that such low speed of for example 1000ms cycle changes.Broadcast channel is informed to all communication terminals in the residential quarter, but special-purpose L3 signaling channel only is informed to the particular communication terminal.In special-purpose L3 signaling channel, comprise kind and the continuous dispatching information of FDM mode.Special-purpose L3 signaling channel can be categorized as specific control channel.
Each communication terminal that the kind indication of FDM mode is determined by which kind of mode of centralized FDM mode or distributing FDM mode is re-used.
Continuous dispatching information is determined the transformat (data modulation system and channel encoding rate) of up or downstream data channel or employed Resource Block etc. under the situation that continues (persistent) scheduling.
(L1/L2 control channel)
In descending L1/L2 control channel, not only can comprise the information that is associated with the transfer of data of down link, also can comprise the information that is associated with the transfer of data of up link.Ground as follows, the former can be classified as part 0, part 1, part 2a and part 2b.Part 1 and part 2a can be classified as not specific control channel, and part 2b can be classified as specific control channel.
(part 0)
In part 0, comprise the information of the transformat (modulation system and channel encoding rate, while distributing user number or all control bit numbers) for expression L1/L2 control channel.Under the transformat of the L1/L2 control channel situation notified by broadcast channel, in part 0, also can comprise distributing user number simultaneously (perhaps all control bit number).
The quality of reception that required code element number depends on users multiplexing number simultaneously and wants multiplexing user in the L1/L2 control channel.As shown in the left side of Fig. 5 C, generally establish the code element number of L1/L2 control channel fully big.Under the situation of change code element number, according to the transformat of the L1/L2 control channel of notifying by broadcast channel, for example can control with the cycle about 1000ms (1 second).But shown in the right side of Fig. 5 C, if the users multiplexing number is few simultaneously, then the required code element number of control channel reduces.Therefore, users multiplexing number and the quality of reception of wanting multiplexing user have the situation that produces waste in guaranteeing for fully big L1/L2 control channel with under the situation about changing in the short period at the same time.
In order to reduce the waste of such L1/L2 control channel, also can be in the L1/L2 control channel, notice modulation system and channel encoding rate, distributing user number (perhaps all control bit number) simultaneously.By notice modulation system and channel encoding rate in the L1/L2 control channel, thereby can change modulation system and channel encoding rate in the shorter cycle than the notice of passing through broadcast channel.
(part 1)
In part 1, comprise call indicator (PI).Each communication terminal is by carrying out demodulation to call indicator, thereby can confirm whether to have carried out the calling for this terminal.
(part 2a)
In part 2a, comprise resource allocation information, distribution time span and the MIMO information of downstream data channel.
The resource allocation information of downstream data channel is determined the Resource Block that downstream data channel comprises.For determining of Resource Block, can use the whole bag of tricks known in this technical field.For example, bitmap (bitmap) mode, tree branch (tree branching) number mode etc.
Distribute time span to represent downstream data channel transmission continuously during what degree.Under the situation that resource distribution content changes the most continually, though be at each TTI, from reducing the viewpoint of expense, also can in a plurality of TTI, distribute the content delivery data channel with identical resource.
In communication, use under the situation of MIMO mode MIMO information given antenna number, fluxion etc.Fluxion also can be called as the information sequence number.
In addition, it is not necessary comprising customer identification information in part 2a, can comprise that they are whole or a part of yet.
(part 2b)
In part 2b, control (HARQ) information and CRC information are retransmitted in the precoding information, the transformat of downstream data channel, the mixing that comprise when using the MIMO mode.
Precoding information when using the MIMO mode determines to be applicable to the weight coefficient of each antenna of a plurality of antennas.Be applicable to the weight coefficient of each antenna by adjustment, the directive property of signal of communication is adjusted.
The transformat of downstream data channel is determined with data modulation system and channel encoding rate.Also can the notification data size or pay(useful) load (payload) size replace channel encoding rate.This is because according to data modulation system and size of data, can derive channel encoding rate uniquely.
Mix the required information of repeating transmission control that control (HARQ:Hybrid Automatic Repeat ReQuest) information comprises downlink grouped of retransmitting.More particularly, retransmit control information and comprise that to handle number, be used for the redundancy version information of expression grouping synthetic method and be used for distinguishing be new grouping or the new and old designator of packet retransmission (New Data Indicator).
The CRC information table is shown under the situation of having used touring redundant check method in the error detection, and stack (convolute) CRC of customer identification information (UE-ID) and detected bit.
The information that is associated with the transfer of data of up link can followingly be classified as part 1 like that to four kinds of part 4.It is better to be categorized as not specific control channel on these information principles, but has distributed the communication terminal of resource to being used for downstream data channel, also can be used as specific control channel and transmits.
(part 1)
In part 1, comprise the confirmation of sending to for the uplink data channels in past.Even sending to confirmation is illustrated in situation about being free from mistakes in the grouping or has the also affirmative acknowledgement of the situation in permissible range (ACK) or be illustrated in the grouping negative response (NACK) of the situation that has the mistake that surpasses permissible range of mistake.
(part 2)
In part 2, comprise for the resource allocation information of uplink data channels in the future, transformat, power information and the CRC information of this uplink data channels.
Resource allocation information is determined at the spendable Resource Block of the transmission of uplink data channels.For determining of Resource Block, can use the whole bag of tricks known in this technical field.For example, bitmap (bitmap) mode, tree branch (tree branching) number mode etc.
The transformat of uplink data channels is determined by data modulation system and channel encoding rate.Also can the notification data size or the pay(useful) load size replace channel encoding rate.This is because according to data modulation system and size of data, can derive channel encoding rate uniquely.
Power information represents that uplink data channels should send with the power of what degree.
The CRC information table is shown under the situation of having used touring redundant check method in the error detection, and stack (convolute) CRC of customer identification information (UE-ID) and detected bit.In addition, in the answer signal (descending L1/L2 control channel) for Random Access Channel (RACH), as UE-ID, also can use the ID at random of RACH lead code (preamble).
(part 3)
In part 3, comprise transmission timing controlled bit.It is be used to the synchronous control bit between the communication terminal of obtaining in the residential quarter.
(part 4)
Fig. 4 E and Fig. 4 A in the same manner, the signal processing key element that expression is relevant with frequency chunks, but be with the difference of Fig. 4 A has been expressed each control information particularly.In Fig. 4 A and Fig. 4 E, identical reference marks is represented identical key element.In the drawings, " mapping in the Resource Block " expression limits the situation that is mapped in the more than one Resource Block of distributing to the particular communication terminal." Resource Block shines upon outward " is illustrated in the situation of shining upon in the universe of the frequency chunks that comprises a plurality of Resource Block.The information (part 1～4) that is associated with transmitting uplink data in the L1/L2 control channel, if distributed the resource that is used for downstream data channel, then send by this resource as specific control channel, if not, then send in the universe of frequency chunks as not specific control channel.
Fig. 7 A represents the mapping example of data channel and control channel.Illustrated mapping example is and a frequency chunks and the example that subframe is relevant roughly to be equivalent to the output content (wherein, pilot channel etc. is re-used in the 3rd Multiplexing Unit 38) of the 1st Multiplexing Unit 1-x.Subframe for example can be corresponding to a transmission time interval (TTI), also can be corresponding to a plurality of TTI.In illustrated embodiment, in frequency chunks, comprise 7 Resource Block RB1～7.These 7 Resource Block are distributed to the good terminal of channel status by the frequency scheduling unit 32 of Fig. 3 A.
Substantially, not specific control channel etc., pilot channel etc. and data channel etc. by time-multiplexed.Not specific control channel is mapped in the universe of frequency chunks dispersedly.That is, not specific control channel is dispersed in the occupied frequency band integral body of 7 Resource Block.In illustrated embodiment, not specific control channel and other control channels (except specific control channel) are by channeling.In other channel, for example also can comprise (also can not distinguish not specific control channel and other control channels, be defined as not specific control channel and comprise synchronizing channel etc.) such as synchronizing channels.In illustrated embodiment, not specific control channel and other control channels are separated certain at interval and a plurality of frequency components of arranging by channeling so that it has respectively.Such multiplex mode is also referred to as distributing frequency division multiplexing (distributed FDM) mode.Interval between the frequency component can be all identical, also can be different.Anyway, need not specific control channel to be dispersed in the universe of a frequency chunks.
In illustrated embodiment, pilot channel etc. also are mapped in the universe of frequency chunks.From correctly carrying out the viewpoint for the channel estimating of various frequency components etc., the such pilot channel of expectation diagram shines upon in wide region.
In illustrated embodiment, Resource Block RB1, RB2, RB4 distribute to user 1 (UE1), and Resource Block RB3, RB5, RB6 distribute to user 2 (UE2), and Resource Block RB7 distributes to user 3 (UE3).As described above, such assignment information is included in the not specific control channel.In addition, the beginning of the Resource Block RB1 in the Resource Block of distributing to user 1 the is mapped specific control channel relevant with user 1.The beginning of Resource Block RB3 in the Resource Block of distributing to user 2 the is mapped specific control channel relevant with user 2.The beginning of the Resource Block RB7 that distributes to user 3 mapped the specific control channel relevant with user 3.Among the figure, need be careful the aspect that user 1,2,3 the occupied size of specific control channel draw unevenly.This represents that the amount of information of specific control channel can be according to the user and different situations.Specific control channel is defined in the Resource Block of distributing to data channel and is shone upon partly.This point is with the distributing FDM of mapping is different dispersedly in various Resource Block, and such mapping mode is also referred to as centralized frequency division multiplexing (localized FDM).
Fig. 7 B represents other mapping example of specific control channel not.User's 1 (UE1) specific control channel only is mapped to a Resource Block RB1 in Fig. 7 A, but disperses discretely to be mapped in Resource Block RB1, RB2, the RB4 integral body (distributing to user 1 Resource Block integral body) in distributing FDM mode in Fig. 7 B.In addition, the specific control channel relevant with user 2 (UE2) also with in the situation shown in Fig. 7 A differently, be mapped in Resource Block RB3, RB5, the RB6 integral body.Specific control channel of the user 2 and shared data channel are by time division multiplexing.Like this, each user's specific control channel and shared data channel can be multiplexing by Time Division Multiplexing mode and/or frequency division multiplexing mode (comprising distributing FDM mode and centralized FDM mode) in the whole or part of the more than one Resource Block of distributing to each user.By the specific control channel of mapping in plural Resource Block, also can also can realize the further raising of the signal quality of specific control channel to specific control channel expectation frequency diversity effect.
The concrete form of the part 0 in the L1/L2 control channel then, is described.
Fig. 7 C is that expression is with the example of the form of the L1/L2 control channel of code element number (perhaps while distributing user number) when notifying with part 0 of L1/L2 control channel.Use at communication terminal under the situation of modulation system by the broadcast channel notice and encoding rate (MCS:Modulation and Coding Scheme), the code element number required at the L1/L2 control channel changes according to while distributing user number.For it is identified, be provided with control bit (being 2 bits) as the information of the part 0 of L1/L2 control channel in Fig. 7 C.By will be for example 00 control bit notify as the information of part 0, at communication terminal this control bit is decoded, thereby the code element number of L1/L2 control channel is 100 situation as can be known.In addition, be equivalent to part 0 at 2 bits of the beginning of Fig. 7 C, variable control channel is equivalent to not specific control channel (being part 1 and part 2a under the descending situation).In addition, in Fig. 7 C, MCS notifies by broadcast channel, but MCS also can be by L3 signaling channel notice.
Fig. 7 D is the example of the form of the L1/L2 control channel when the distributing user number is with part 0 notice when representing each MCS.From the MCS of the kind that is predetermined, use according to the quality of reception of communication terminal under the situation of appropriate MCS, change in the quality of reception of the required code element number of L1/L2 control channel according to communication terminal.For it is identified, be provided with control bit (being 8 bits) as the information of the part 0 of L1/L2 control channel in Fig. 7 D.There are four kinds of MCS in expression as an example in Fig. 7 D, and the maximum of distributing user number is 3 situation in the time of each MCS.Because while distributing user number is 0～3, so this information can be represented (00=0 user, 01=1 user, 10=2 user, 11=3 user) with 2 bits.Because needing 2 bits for each MCS, so the part 0 of this moment becomes 8 bits.For example by 01100001 control bit is notified as the information of part 0, thus at communication terminal based on this control bit as can be known corresponding to oneself the control information (being part 2a under the descending situation) of the quality of reception.
The example of the form of the information bit (part 0) in the L1/L2 control channel when Fig. 7 E is three sector strucres of expression.Under the situation of three sector strucres, also can to have prepared three kinds of patterns in order sending for the information bit (part 0) of the transformat of representing the L1/L2 control channel, and to distributing each sector, to have made that each pattern can be not overlapping in frequency domain.By preference pattern, make that the sending mode in adjacent sectors (perhaps residential quarter) is different mutually, thereby can obtain the effect of interference coordination.
Fig. 7 F represents the example of various multiplexing methods.In above-mentioned example, various not specific control channels are re-used in distributing FDM mode, but also can use code division multiplexing (CDM) mode or the such suitable various multiplexing method of Time Division Multiplexing mode.Fig. 7 F (1) expression is carried out multiplexing situation in distributing FDM mode.By use to be used for determining the number 1,2,3,4 of discrete a plurality of frequency contents, thus the signal that can make each user quadrature suitably.But, also can be unlike this example standard.In addition, by between adjacent residential quarter, using different rules, thereby can make the interference volume randomization when having carried out transmission power control.Fig. 7 F (2) expression is carried out multiplexing situation in code division multiplexing (CDM) mode.By using sign indicating number 1,2,3,4, thus the signal that can make each user quadrature suitably.Fig. 7 F (3) expression is in distributing FDM mode, and user's multiplexing number is changed to 3 o'clock situation.By number 1,2,3 that be used for to determine discrete a plurality of frequency contents is defined again, thus the signal that can make each user quadrature suitably.Under the situation of distributing user number less than maximum number, shown in Fig. 7 F (4), the base station also can increase the transmitted power of down control channel at the same time.In addition, also can be suitable for the mixing of CDM and FDM.
Fig. 8 A represents the part block diagram of the portable terminal that uses in one embodiment of the invention.In Fig. 8 A, carrier frequency tuned cell 81, filter unit 82, Cyclic Prefix (CP) delete cells 83, fast Fourier transform unit (FFT) 84, CQI determination unit 85, broadcast channel (perhaps calling channel) decoding unit 86, not specific control channel (part 0) decoding unit 87-0, not specific control channel decoding unit 87, specific control channel decoding unit 88 and data channel decoding unit 89 have been drawn.
The centre frequency of 81 pairs of frequency acceptance bands of carrier frequency tuned cell is suitably adjusted, and makes it possible to receive the signal of the frequency chunks of distributing to terminal.
Cyclic Prefix delete cells 83 is deletion protection interval from receive signal, and extracts the effective code element part from receiving symbol.
The information that comprises in 84 pairs of effective code elements of fast Fourier transform unit (FFT) is carried out fast fourier transform, carries out the demodulation of OFDM mode.
The received power level of the pilot channel that CQI determination unit 85 comprises is to received signal measured, and measurement result is fed back to the base station as channel condition information CQI.Each fast Resource Block of whole resource in the frequency chunks of CQI carries out, and they are all reported the base station.
86 pairs of broadcast channels of broadcast channel (perhaps calling channel) decoding unit are decoded.Including under the situation of calling channel, it is also decoded.
The information of the part 0 in the L1/L2 control channel of not specific control channel (part 0) decoding unit 87-0 is decoded.By this part 0, can identify the not transformat of specific control channel.
The not specific control channel that not specific control channel decoding unit 87 comprises is to received signal decoded, and extracts schedule information.In schedule information, include for being illustrated in the information whether shared data channel that mails to its terminal has distributed Resource Block the information of expression Resource Block number etc. under the situation of having distributed.
The specific control channel that specific control channel decoding unit 88 comprises is to received signal decoded.Specific control channel comprises the data modulation relevant with sharing data channel, channel encoding rate and HARQ information.
Data channel decoding unit 89 is based on the information of extracting from specific control channel, and the shared data channel that comprises in is to received signal decoded.Also can the base station be arrived in affirmative acknowledgement (ACK) or negative response (NACK) report according to decoded result.
Fig. 8 B and Fig. 8 A in the same manner, the part block diagram of expression portable terminal, but be with the difference of Fig. 8 A has been expressed each control information particularly.In Fig. 8 A and Fig. 8 B, identical reference marks is represented identical key element.In the drawings, the situation that is defined to the information that the more than one Resource Block of distributing to the particular communication terminal shines upon is extracted in " Resource Block in mapping " expression." Resource Block shines upon outward " expression is extracted in the situation of the information of shining upon in the universe of the frequency chunks that comprises a plurality of Resource Block.
Fig. 8 C represents the key element relevant with the receiving element of Fig. 8 A.Though optional in the present invention, in the present embodiment, when receiving, carry out receiving by the antenna diversity of two antennas.The downstream signal that is received by two antennas is input to RF receiving element (81,82) respectively, and protection is (Cyclic Prefix) deleted (83) at interval, carry out fast fourier transform (84).The signal that each antenna receives is synthetic in the antenna diversity synthesis unit.Signal after synthetic offers each decoding unit of Fig. 8 A or the separative element of Fig. 8 B.
Fig. 9 is the flow chart of the action example of expression one embodiment of the invention.As an example, the user who supposes to have the mobile terminal UE 1 that can communicate by letter under the bandwidth of 10MHz has entered residential quarter or the sector that the bandwidth with 20MHz communicates.The lowest band of supposing communication system is 5MHz, as illustrated in fig. 2, establishes whole frequency band and is divided into four frequency chunks 1～4.
In step S11, the broadcast channel that terminal UE 1 receives from the base station confirms which the spendable frequency chunks of this TV station is.Broadcast channel also can be by comprising whole 20MHz the frequency band of 5MHz of centre frequency of frequency band send.Like this, the different any terminal of receivable bandwidth can both receive broadcast channel simply.Broadcast channel is for the user with the bandwidth communication of 10MHz, the use of the combination of two adjacent frequency chunks that authorized frequency piece (1,2), (2,3) or (3,4) are such.Can permit the use that these are whole, perhaps also use can be limited to any combination.As an example, suppose authorized frequency piece 2,3 use.
In step S12, terminal UE 1 receives downlink pilot frequency channel, measures and frequency chunks 2,3 relevant received signal qualities.Mensuration is that each Resource Block to a plurality of Resource Block that are included in each frequency chunks carries out, and they all report the base station as channel condition information CQI.
In step S21, the base station is carried out frequency scheduling based on the channel condition information CQI from terminal UE 1 and other-end report to each frequency chunks.The data channel that mails to UE1 is to be confirmed and management by frequency chunks assignment control (Fig. 3 A 31) from frequency chunks 2 or 3 transmission.
In step S22, the base station generates the control signaling channel according to schedule information to each frequency chunks.In the control signaling channel, comprise not specific control channel and specific control channel.
In step S23, according to schedule information, from the base station each frequency chunks is transmitted control channel and share data channel.
In step S13, terminal UE 1 receives the signal that transmits by frequency chunks 2 and 3.
In step S14-0, terminal UE 1 is from the part 0 of the control channel that receives by frequency chunks 2 and 3, and identification is the transformat of specific control channel not.
In step S14, from the control channel that receives by frequency chunks 2, separate not specific control channel, and with its decoding, extract schedule information.Similarly, also separate not specific control channel from the control channel that receives by frequency chunks 3, and with its decoding, extract schedule information.In any schedule information, all comprise the information of whether the shared data channel that mails to terminal UE 1 having been distributed Resource Block for expression, under the situation of distributing, represent the information of Resource Block number etc.Do not distribute under the situation of any Resource Block in mailing to the shared data channel of this TV station, terminal UE 1 turns back to the wait accepting state, waits for the reception of control channel.Distributed under the situation of certain Resource Block in mailing to the shared data channel of this TV station, the specific control channel that terminal UE 1 comprises in to received signal in step S15 separates, and with its decoding.Specific control channel comprises the data modulation relevant with sharing data channel, channel encoding rate and HARQ information.
In step S16, terminal UE 1 is based on the information of extracting from specific control channel, and the shared data channel that comprises in is to received signal decoded.Also can be according to decoded result, to base station report affirmative acknowledgement (ACK) or negative response (NACK).Afterwards, same step repeatedly.
In the 1st embodiment, control channel is divided into beyond specific control channel and its, described specific control channel is to be assigned with the essential decoding of terminal of Resource Block and the channel of demodulation, specific control channel is defined in the Resource Block that is assigned with and shines upon, and other control channel shines upon in the universe of frequency band.Thus, can realize the raising of the efficiency of transmission relevant with control channel and high quality etc.But the present invention is not limited to the example of such transmission method.
Fig. 7 G is the figure of the mapping example of the expression data channel of the 2nd embodiment of the present invention and control channel.In the present embodiment, also use as shown in Figure 3 base station.At this moment, about control channel, mainly use the processing key element shown in Fig. 4 B.In the present embodiment, specific control information and not specific control information are all distinguished clearly, and the universe of the frequency band by a plurality of Resource Block is sent out.Shown in Fig. 4 B, like that, in the present embodiment, will handle unit as one with a plurality of subscriber-related control channel integral body and carry out error correction coding.Whether user's set (generally being travelling carriage) is decoded and demodulation to control channel, differentiate this TV station and be assigned with, and according to channel allocation information the data channel that transmits by specific Resource Block is restored.
For example, suppose having distributed the 1st of Resource Block～the 3rd user UE1, UE2, UE3 to transmit the control information of 10 bits respectively.The control information 30 bit integral body of three people's amount are carried out error correction coding as a processing unit.Suppose that encoding rate (R) is 1/2, then generates and sends 30 * 2=60 bit.On the other hand, also consider with present embodiment differently, the situation of error correction coding and transmission is carried out in the control information that each is individual respectively.At this moment, control information 10 bits of a people's amount carry out error correction coding, generate 10 * 2=20 bit, and it prepares three people's amount (adding up to 60 bits).The control information amount that should transmit all becomes 60 bits, but according to present embodiment, longer 3 times than another because of the processing unit of error correction coding, be favourable so present embodiment sets out from the viewpoint that improves coding gain (that is, mistake is given birth in difficult labour).In addition, in the present embodiment, 60 bit integral body have been added detection bits (CRC is than top grade), but when each user is carried out error correction coding, become the additional detection bits of each 20 bit.Therefore, from the viewpoint of the increase of the expense that suppresses detection bits, also be that present embodiment is favourable.
Fig. 7 H is the figure of the mapping example of the expression data channel of the 3rd embodiment of the present invention and control channel.Also use base station as shown in Figure 3 in the present embodiment, but mainly use processing key element shown in Fig. 4 C about control channel.In the present embodiment, also do not distinguish specific control information and not specific control information clearly, but the control channel restriction is mapped in the Resource Block of distributing to the user that should receive it.For example the control channel of the 1st user UE1 is mapped to the 1st and the 2nd Resource Block RB1, RB2, and the control channel of the 2nd user UE2 is mapped to the 3rd and the 4th Resource Block RB3, RB4, and the control channel of the 3rd user UE3 is mapped to the 5th Resource Block RB5.Error correction coding is that each user is carried out.This point is different with the 2nd embodiment, and in the 2nd embodiment, the 1st～the 3rd user's control channel is together by error correction coding and to Resource Block RB1～RB5 mapping.
In the present embodiment, control channel all is defined in the identical Resource Block with data channel, but concerning travelling carriage, it is unknown before control channel receives which Resource Block this travelling carriage having been distributed.Therefore, each travelling carriage need receive whole Resource Block of the mapped control channel of possibility, not only this TV station is also carried out demodulation to other control channel.In the example shown in Fig. 7 H, the 1st user UE1 is by carrying out demodulation to the control channel that is mapped to whole Resource Block RB1～RB5, thereby can know the 1st and the 2nd Resource Block RB1, RB2 have been distributed this TV station.
In the 2nd embodiment, in order to receive control channel with required quality the user who is in the poorest communication environment, determined the transmitted power of base station accordingly with the user in this difference ring border.Therefore, the user for not being the poorest communication environment becomes superfluous quality, and the base station need wasted unnecessary power all the time.But in the 3rd embodiment, the Resource Block that the processing of error correction coding etc. or transmission frequency band are limited at each user carries out, so transmission power control also can be carried out each user.Therefore, can not consume the power of base station redundantly.In addition, because Resource Block is to distribute to the good user of channel status, so can realize the high quality of control channel with such good channel status transmitting control channel.
Fig. 7 I is the figure of the mapping example of the expression data channel of the 4th embodiment of the present invention and control channel.Also use base station as shown in Figure 3 in the present embodiment, but become shown in Fig. 4 D about the processing key element of control channel.In the present embodiment, also do not distinguish specific control information and not specific control information clearly, control channel and the 3rd embodiment carry out error correction coding to each user in the same manner, determine transmitted power.But control channel is mapped, makes not only to be distributed to the Resource Block of distributing to the user that should receive it, also is distributed to other Resource Block.Even like this, also can transmitting control channel.
In addition, in the 1st to the 4th embodiment, a plurality of Resource Block are shone upon dispersedly under the situation of control channel, need not all the resource block mapping control channels in the frequency band of having given.For example, can be only to Resource Block RB1, the RB3 of the odd number in the frequency band of having given ... mapping control channel, the also resource block mapping of dual numbers number only.Control channel can limit and be mapped in suitable any Resource Block known between base station and the travelling carriage.Like this, the hunting zone in the time of can suitably dwindling travelling carriage and extract the assignment information of this TV station.
As mentioned above, in the 2nd embodiment, determine the transmitted power of base station accordingly with the user who is in the poorest communication environment, the base station need wasted unnecessary power all the time.But, if suppose that a plurality of user's communications environment same degree ground is good, then can eliminate such misgivings.Therefore, in the communication environment of the quality that can obtain same degree to a plurality of users, the method that illustrates in the 2nd embodiment is favourable.From such viewpoint, in the 5th embodiment of the present invention, the user's set in the residential quarter is suitably divided into groups, and each component has been cut service band.
Fig. 7 J is the concept map for explanation the 5th embodiment of the present invention.In illustrated embodiment, according to having prepared three groups from the distance of base station, in group 1, distributed Resource Block RB1～RB3, in group 2, distributed Resource Block RB4～RB6, in group 3, distributed Resource Block RB7～RB9.Group number and the number of resource blocks prepared are an example, can use suitable any number.After grouping, can carry out the various methods that in the 1st to the 4th embodiment, illustrate.By user and frequency band are divided into groups, thereby can reduce quality poor of the quality of reception between the user.Thus, can tackle effectively result from difference ring border the user and consume the problem (problem of in the 2nd embodiment, worrying) of the transmitted power of base station redundantly.In addition, also divide into groups as present embodiment in the 3rd embodiment, thereby the transmitted power of the control channel in same group becoming same degree, is favourable from the viewpoint of the stabilisation of the action that realizes base station transmitter etc.
In illustrated embodiment, for the purpose of simplifying the description, according to having prepared three groups from the distance of base station.But not only based on distance, can also divide into groups based on CQI (CQI).Can in the corresponding technical field of SIR or SINR etc., measure CQI according to known suitable any amount.
Not specific control channel (comprising part 0) is the information of whole user's needs, because based on this not specific control channel data channel being decoded, so not specific control channel is carried out error detection (CRC) coding and chnnel coding.In the 6th embodiment of the present invention, the object lesson of this error detection coding and chnnel coding is described.Fig. 4 E is the figure (to separately control information, comprise chnnel coding/spread spectrum/data modulating unit 41,42-A) corresponding with the structure of L1/L2 control information (part 0) and L1/L2 control information (part 2a and 2b) being carried out chnnel coding respectively.In this alternative structure of following explanation.
Figure 10 A represents part 0 and part 2a and 2b are carried out error detection coding together, part 0 and part 2a and 2b is carried out the situation of chnnel coding respectively.The part 0 of communication terminal UE1 and UE2 and part 2a and 2b carry out error detection coding together, and use the L1/L2 control channel that is used for this communication terminal based on part 0 from part 2a and 2b.
So error detection (CRC) the sign indicating number possibility more especially big than the control ratio of part 0 because there being part 0 at this moment, can reduce the expense of error detection coding.
Figure 10 B represents part 0 and part 2a and 2b are carried out error detection coding respectively, part 0 and part 2a and 2b is carried out the situation of chnnel coding respectively.Compare with the situation of Figure 10 A, it is big that expense becomes, but have under the situation of the error detection failure of part 0, need not to carry out the advantage of the processing of part 2a and 2b.
Figure 10 C represents part 0 and part 2a and 2b are carried out error detection coding together, part 0 and part 2a and 2b is carried out together the situation of chnnel coding.At this moment, if part 0 and part 2a and 2b are not decoded together, then can't extract the information of part 0, but have the advantage that the efficient of channel encoding rate improves.
In Figure 10 A～10C, error detection coding and the chnnel coding of part 0 and part 2a and 2b has been described, but can be suitable for too for the not specific control channel beyond part 2a and the 2b.
Figure 10 D represents the method example for the amount of information of cutting down the transmitting uplink data relevant information.In step S1, send descending L1/L2 control channel from the base station.The control information that the is used for a plurality of communication terminals transmission (for convenience, establishing user's multiplexing number is N) that is re-used (particularly, is described with Fig. 7 F) as described above relatively like that.Each communication terminal is to mailing to own or other a plurality of L1/L2 control channels of communication terminal carry out demodulation.For example, the control channel of supposing to comprise the UE-ID of this terminal is mapped to the X position in N.At this moment, user's set carries out N time demodulation process at most, just can find out the not specific control channel that mails to this device that is mapped in the X position, and according to the assignment information that comprises at it, investigate thoroughly the distribution content relevant with this terminal (the available Resource Block of this terminal (RB) for which etc.).
In step S2, use this distribution RB that is assigned with, for example the grouping of up link (t=TTI1) is sent to the base station.T=TTI1 represents constantly.
In step S3, the base station receives, decodes this uplink data channels D (t=TTI1), and judges that zero defect is arranged.Result of determination is with ACK or NACK performance.The base station must be notified to this result of determination the communication terminal in transmission source.The base station is notified to communication terminal by the L1/L2 control channel with its result of determination.According to the classification of Fig. 5 A, this result of determination (sending to confirmation) belongs to the part 1 of transmitting uplink data relevant information.Because the base station also receives up channel from various communication terminals, send to confirmation (ACK/NACK) so these whole communication terminals are notified respectively.Therefore, in order to distinguish these information mutually, and to whole further user identifying informations (ID) of the part 1 (ACK/NACK) of the transmitting uplink data relevant information in the descending L1/L2 control channel, what then each communication terminal can be known the uplink data channels that sends in the past for this terminal reliably sends to confirmation (ACK/NACK).
But, in the present embodiment, from cutting down the viewpoint of control information amount, carry out descending L1/L2 control channel transmission and not to the information of the part 1 of each communication terminal additional identification information respectively.Corresponding relation when instead, each communication terminal being maintained the information of having shone upon part 2 between the information of employed distribution X and part 1.For example, suppose under the situation of carrying out multiplexing method such shown in Fig. 7 F (1), use in order to notify communication terminal UE1 with the information of part 2 and distribute number 3 (X=3) (among the multiplexing number N the 3rd).At this moment, by to distributing numbers 3 resource information to carry out demodulation, thereby determine the Resource Block of uplink data channels, and in this Resource Block, send uplink data channels.For the information (ACK/NACK) of the part 1 of this uplink data channels, be documented in the resource of the distribution numbers 3 in the descending L1/L2 control channel that sends with t=TTI1+ α.α is the time of sending to confirmation and setting be used to beaming back.In step S3, such L1/L2 control channel is sent to communication terminal.
In step S4, each communication terminal based on distribution X and regulation during α, read the information that is associated with part 1, confirm whether to need to retransmit the data D (t=TTI1) that sends in the moment of t=TTI1.
So in the present embodiment, to each portable terminal maintain the distribution used among the step S1 number and the distribution in step S3, used number between 1 couple 1 corresponding relation, thereby the base station can specify the part 1 (ACK/NACK) of transmitting uplink data relevant information for mailing to the part of which communication terminal respectively.By this method, can reduce the amount of information of the descending L1/L2 control channel that in the step S22 of Fig. 9, generates like this.Distributed the resource that is used for uplink data channels if carve the communication terminal of the M platform of t=TTI1 at a time, then distribution X be 1 ..., M, the number of the assignment information of transmitting uplink data relevant information (part 2) and after the moment t=TTI1+ α number that must send to the destination of confirmation (part 1) all become M.Therefore, can keep 1 couple's 1 relevant with distribution X as described above corresponding relation all the time.
Figure 10 E is the figure of the action example of expression when carrying out frequency hopping.The frequency band of distributing to communication system is 20MHz, comprises four frequency chunks of the lowest-bandwidth with 5MHz.In illustrated embodiment, communication system can be held user 40 people of band communication that can 5MHz, user 20 people of band communication that can 10MHz, user 10 people of band communication that can 20MHz.
The user of band communication that can 20MHz can use whole frequency chunks 1～4 all the time.But, in can only the user with 40 people of the band communication of 5MHz, from No. 1 to No. 10 user moment t permission to use frequency chunks 1, moment t+1 permission to use frequency chunks 2, moment t+2 permission to use frequency chunks 3.From the user of No. 20, o.11 to the at moment t, t+1, the licensed frequency of utilization piece 2 of t+2,3,4.From No. 21 to No. 30 user at moment t, t+1, the licensed frequency of utilization piece 3 of t+2,4,1.From No. 31 to No. 40 user at moment t, t+1, the licensed frequency of utilization piece 4 of t+2,1,2.In addition, in can only the user with 20 people of the band communication of 10MHz, from No. 1 to No. 10 user moment t permission to use frequency chunks 1 and 2, moment t+1 permission to use frequency chunks 3 and 4, moment t+2 permission to use frequency chunks 1 and 2.From the user of No. 20, o.11 to the in moment t, t+1, t+2 permission to use frequency chunks 3 and 4,1 and 2,3 and 4.
Such frequency-hopping mode is by broadcast channel or other method each user that given advance notice.At this moment, stipulate several patterns in advance as frequency-hopping mode, by will being notified to the user for the mode number wherein which pattern of expression is used, thereby can enough few bit numbers frequency-hopping mode be notified to the user.As present embodiment, spendable frequency chunks has under the situation of several options, sets out in the viewpoint that realizes the homogenizing of communication quality between the user and between the frequency chunks, preferably changes spendable frequency chunks after the communication beginning.For example, if do not carried out frequency hopping as present embodiment, then under the bigger situation of the quality difference of communication quality between the frequency chunks, specific user must communicate by letter with the quality of difference all the time.By carrying out frequency hopping, even at a time communication quality is poor, also can expect to improve constantly at other.
In illustrated embodiment, the frequency chunks of expression 5MHz and 10MHz is the frequency-hopping mode of skew to the right one by one, but also can use various frequency-hopping modes in addition.This is because no matter adopt any frequency-hopping mode, as long as it is known at transmitter side and receiver side.
In the 9th embodiment of the present invention of following explanation, illustrate except the channel that sends control signaling, also to send the method for calling channel.
Figure 11 is the flow chart (left side) of action example of expression one embodiment of the invention and the figure of frequency band (right side).In step S1, the user from the base station to the subordinate sends broadcast channel.Shown in Figure 11 (1), broadcast channel is with the lowest-bandwidth transmission of the centre frequency that comprises the full range band.In the broadcast message of notifying by broadcast channel, comprise the corresponding relation between the receivable bandwidth of user and the spendable frequency chunks.
In step S2, user (for example UE1) enters the wait accepting state in appointed frequency chunks (for example frequency chunks 1).At this moment, user UE1 adjust to receive the frequency band of signal, makes it possible to receive the signal of the frequency chunks 1 of licensed use.In the present embodiment, not only transmit the control signaling channel relevant with user UE1 by frequency chunks 1, also the transmission calling channel relevant with user UE1.If be identified the calling of having carried out user UE1 by calling channel, then flow process proceeds to step S3.
In step S3, receive data channel by the frequency chunks that is instructed to according to schedule information.Turn back to the wait accepting state after the user UE1 again.
Figure 12 is other action flow charts (left side) of examples of expression one embodiment of the invention and the figure of frequency band (right side).Ground same as described above in step S1, sends broadcast channel from the base station, broadcast channel is with the lowest-bandwidth transmission (Figure 12 (1)) of the centre frequency that comprises the full range band.With the example of Figure 11 in the same manner, suppose that spendable frequency chunks is frequency chunks 1.
In step S2, user UE1 enters the wait accepting state.Different with above-mentioned example, user UE1 does not adjust the frequency band that receives signal in this moment.Therefore, with the frequency band Waiting for Call channel (Figure 12 (2)) identical with the frequency band that receives broadcast channel.
In step S3, confirmed after the calling channel that terminal is transferred to the frequency chunks 1 of distributing to this TV station, receive the control signaling channel, and communicate (Figure 12 (3)) according to schedule information.Turn back to the wait accepting state after the user UE1 again.
In example shown in Figure 11, terminal is promptly transferred to frequency chunks 1 when wait for receiving, but in example shown in Figure 12, and terminal did not shift and confirmed to transfer to frequency chunks 1 after the calling of this TV station in this moment.In the former method, each user uses the frequency chunks waiting signal of distributing to separately, but in the latter's method, all the user uses identical frequency band waiting signal.Therefore, the former with the latter is compared, may be better aspect frequency of utilization resource equably.On the other hand, be used for confirming that the peripheral cell search that whether needs to switch (handover) uses the lowest-bandwidth of whole frequency band central authorities to carry out.Therefore, from the viewpoint of the frequency harmony number of times that reduces terminal, the frequency band of the frequency band when expectation example as shown in figure 12 will be waited for reception like that during with Cell searching is consistent.
But from the viewpoint of the received signal quality that improves control channel, link circuit self-adapting (link adaptation) is carried out in expectation.In the 10th embodiment of the present invention, use the control of transmission power control (TPC:Transmission Power Control) and Adaptive Modulation and Coding (AMC:Adaptive Modulation and Coding) as the method for carrying out link circuit self-adapting.Figure 13 represents to carry out the situation of transmission power control, by the transmitted power of control downlink channel, thereby attempts to reach required quality at receiver side.More particularly, poor because estimating for the channel status away from the user 1 of base station, so send downlink channel with big transmitted power.On the contrary, estimate for the channel status near the user 2 of base station good.At this moment, if hypothesis is big to the transmitted power of user 2 downlink channel, then might get well user 2 received signal quality, can become big but other user disturbed.Because user 2 channel status is good, so even transmitted power is little, also can guarantee required quality.Therefore, at this moment, downlink channel is sent out with smaller transmitted power.Transmission power control by the situation of carrying out individually under, modulation system and channel coding method are maintained necessarily, use known combination at transmitter side and receiver side.Therefore, under transmission power control, channel is separated timing, need not to notify in addition modulation system etc.
Figure 14 is the situation that Adaptive Modulation and Coding control is carried out in expression, comes both sides or a side of adaptively modifying modulation system and coded system according to the quality of channel status, thereby attempts to reach the required quality at receiver side.More particularly, suppose from the transmitted power of base station for certain that it is poor then to estimate for the channel status away from the user 1 of base station, so order of modulation is set and/or channel encoding rate is also set lessly lessly.In illustrated embodiment, use QPSK in the modulation system for user 1, each code element is transmitted the information of 2 bits.With respect to this, it is good to estimate for the channel status near the user 2 of base station, so order of modulation is set significantly and/or channel encoding rate is also set significantly.In illustrated embodiment, use 16QAM in the modulation system for user 2, each code element is transmitted the information of 4 bits.Like this, can reach required quality to improve reliability to the user of channel status difference, improve throughput when can keep required quality to the good user of channel status.In Adaptive Modulation and Coding control, the channel that receives is separated timing, so the information of the modulation system that need implement this channel, coded system, code element number etc. is need be by notifying this information to receiver side someway.In addition, the bit number that each code element can be transmitted is according to the quality of channel status and difference, thus if channel status well then can be with few code element number transmission information, but then, if not then need more code element number.
In the 10th embodiment of the present invention, the not specific control channel that must will decode to not specific user carries out transmission power control, a side or both sides that the specific control channel that the specific user's decoding that has been assigned with Resource Block is got final product carries out transmission power control and Adaptive Modulation and Coding control.Specifically, consider following three kinds of methods.
(1)TPC-TPC
In the 1st method, not specific control channel is carried out transmission power control, specific control channel is also only carried out transmission power control.Because modulation system etc. in transmission power control is fixed, so if channel is received well, then can carry out demodulation and need not the prior notice relevant with modulation system etc. it.Because not specific control channel is dispersed in the frequency chunks integral body, so in whole frequency range, send with identical transmitted power.With respect to this, only occupy the specific Resource Block subscriber-related with this with a certain subscriber-related specific control channel.Therefore, for each user who has been assigned with Resource Block, the transmitted power of specific control channel also can be adjusted individually, makes received signal quality improve.For example also can be in the example shown in Fig. 7 A, the B, not specific control channel is with transmitted power P
0Send, user's 1 (UE1) specific control channel with user 1 corresponding transmitted power P
1Send, user's 2 (UE2) specific control channel with user 2 corresponding transmitted power P
2Send, user's 3 (UE3) specific control channel with user 3 corresponding transmitted power P
3Send.And the part of sharing data channel can be with identical or different transmitted power P
DSend.
As described above, not specific control channel must otherwise specific user crew decodes.But the main purpose of transmitting control channel is, the situation of the data that should receive and this schedule information untill further notice user of Resource Block that given actual allocated will be arranged.Therefore, the transmitted power in the time of also can being adjusted at the not specific control channel of transmission makes the user who has been assigned with Resource Block is satisfied required quality.For example in the example of Fig. 7 A, B, under the user 1,2 who has been assigned with Resource Block, 3 crews are positioned near the base station situation, the transmitted power P of specific control channel not
0Can be set to smaller.At this moment, the user of for example cell edge beyond the user 1,2,3 possibly can't decode to not specific control channel well, but does not have distributes resource blocks for them, so there is not actual loss.
(2)TPC-AMC
In the 2nd method, not specific control channel is carried out transmission power control, specific control channel is only carried out Adaptive Modulation and Coding control.Under the situation of carrying out AMC control, the modulation system etc. of generally need giving advance notice.In the method, the information for modulation system of specific control channel etc. is included in the not specific control channel.Therefore, each user at first to not specific control channel receive, decoding and demodulation, and differentiate and have or not the data that mail to this TV station.If its existence then except extracting schedule information, is also extracted the information for the modulation system that is applicable to specific control channel, coded system and code element number etc.Then, according to the information of schedule information and modulation system etc., specific control channel is by demodulation, obtains the information of the modulation system of sharing data channel etc., shares data channel by demodulation.
Compare with shared data channel, control channel need not transmit with high-throughput so.Therefore, not specific control channel is being carried out under the situation of AMC control, the combination sum of modulation system etc. can lack than the combination sum of the modulation system that is used for sharing data channel etc.As an example, as the not combination of the AMC of specific control channel, modulation system can be fixed to QPSK, and encoding rate changes as 7/8,3/4,1/2,1/4.
According to the 2nd method, the quality of specific control channel not can be guaranteed for more than certain grade all users, can make the quality of specific control channel for good simultaneously.This is because specific control channel is mapped to the Resource Block that channel status is good concerning specific each communication terminal and uses suitable modulation system and/or coded system.In control channel, by the part of specific control channel being carried out Adaptive Modulation and Coding control, thereby can improve the quality of reception of this part.
In addition, also the number of combinations of modulation system and channel encoding rate can be limited enough fewly, make receiver side to the tentative demodulation of all combinations.Finally adopt by the content of demodulation well.Like this, even without the information of giving advance notice and being associated with modulation system etc., also can carry out AMC control to a certain degree.
(3)TPC-TPC/AMC
In the 3rd method, not specific control channel is carried out transmission power control, specific control channel is carried out the both sides of transmission power control and Adaptive Modulation and Coding control.As mentioned above, under the situation of carrying out AMC control, need the modulation system etc. of giving advance notice in principle.In addition, even from existing more cataclysmal decline also will guarantee the viewpoint of required quality, the combination sum of expectation modulation system and channel encoding rate is more.But if its sum is many, then the decision of modulation system etc. is handled and is also become complicated, notifies required amount of information also to become many, and it is big that computational burden and expense (overhead) become.In the 3rd method, except AMC control, also and use transmission power control, keep required quality according to both sides' control.Therefore, can not only control the whole of the cataclysmal decline of compensate for slower with AMC.Specifically, reach near the modulation system required quality etc. and be selected, guarantee required quality by under selecteed modulation system etc., adjusting transmitted power.Therefore, the combination sum of modulation system and channel coding method can less limit.
Above-mentioned arbitrary method is all only carried out transmission power control to not specific control channel, so the user can easily obtain control information when can keep required quality.Control differently with AMC, the transinformation of each code element is constant, so can transmit simply with set form.Because not specific control channel is dispersed in frequency chunks universe or a plurality of Resource Block, so the frequency diversity effect is big.Therefore can expect by adjusting the such simple transmission power control of average level of long periodicity, reach required quality fully.In addition, in the present invention, not specific control channel is only carried out transmission power control not necessarily.For example, can use broadcast channel, be used for not the transformat of specific control channel and controlled by low speed ground.
AMC control information by being used in specific control channel (be used for determining modulation system etc. information) is included in not specific control channel, thereby can carry out AMC control to specific control channel.Therefore, can improve efficiency of transmission or the quality of specific control channel.Code element number required in not specific control channel is for roughly certain, but in specific control channel required code element number according to the interior perhaps antenna number of AMC control etc. and different.For example suppose channel encoding rate be 1/2 and antenna number be that 1 o'clock required code element number is N, then channel encoding rate be 1/4 and antenna number be that 2 o'clock required code element numbers are increased to 4N.Like this, even required code element number changes in control channel, in the present embodiment, still can come transmitting control channel by the simple set form shown in Fig. 7 A, B.The content that code element number changes is not included in the not specific control channel, and it is included in the specific control channel.Therefore, by change specific control channel and the shared ratio of shared data channel in specific Resource Block, thereby can tackle this variation of code element number neatly.
More than, preferred embodiment of the present invention has been described, but the present invention is not limited to these, in the scope of intention of the present invention, can carry out various distortion and change.For convenience of explanation, the present invention is divided into a plurality of embodiment and illustrates, but the differentiation of each embodiment is not the differentiation of internal of the present invention, can use plural embodiment as required.
The priority based on the Japanese patent application of application on January 18th, 2006 2006-10496 number is advocated in this world application, its full content is also referred to this world apply for.
The priority based on the Japanese patent application of application on May 1st, 2006 2006-127987 number is advocated in this world application, its full content is also referred to this world apply for.
The priority based on the Japanese patent application of application on October 3rd, 2006 2006-272347 number is advocated in this world application, its full content is referred to this world apply for.
The priority based on the Japanese patent application of application on November 1st, 2006 2006-298312 number is advocated in this world application, its full content is also referred to this world apply for.
Claims (12)
1. base station comprises:
The frequency scheduling device, the frequency band that offers communication system comprises a plurality of frequency chunks, and each frequency chunks comprises a plurality of Resource Block, and each communication terminal is distributed at least one Resource Block;
The 1st generates parts, and the communication terminal that has distributed at least one Resource Block in described frequency scheduling device is generated data channel;
The 2nd generates parts, generates specific control channel to distributed the communication terminal unit of at least one Resource Block in described frequency scheduling device;
The 3rd generates parts, and the communication terminal that has distributed at least one Resource Block in described frequency scheduling device is generated common not specific control channel;
The 4th generates parts, generates the broadcast channel for the broadcast message that communication terminal is notified;
Reusable component of software, in a plurality of frequency chunks that the frequency band that communication system is provided comprises, configuration broadcast channel in comprising the frequency chunks of centre frequency, and a plurality of frequency chunks in that the whole frequency band that communication system is provided comprises dispose not specific control channel, at least one specific control channel and at least one data channel; And
Transmit block is with the output signal transmission of described reusable component of software.
2. base station as claimed in claim 1 is characterized in that,
Generate in the specific control channel that generates in the parts the described the 2nd, comprise the information relevant with the data modulation system.
3. base station as claimed in claim 1 is characterized in that,
Generate in the specific control channel that generates in the parts the described the 2nd, comprise the information relevant with coded system.
4. base station as claimed in claim 1 is characterized in that,
Generate in the specific control channel that generates in the parts the described the 2nd, comprise and mix the relevant information of repeating transmission control mode.
5. as any described base station of claim 1 to 4, it is characterized in that,
Described reusable component of software makes at least one data channel that generates in described the 1st generation parts carry out time-multiplexed to generating the not specific control channel that generates in the parts and generate at least one the specific control channel that generates in the parts the described the 2nd the described the 3rd.
6. as any described base station of claim 1 to 4, it is characterized in that,
The same configuration call channel with data channel of described reusable component of software.
7. sending method comprises:
The frequency band that offers communication system comprises a plurality of frequency chunks, and each frequency chunks comprises a plurality of Resource Block, each communication terminal is distributed the step of at least one Resource Block;
The communication terminal that has distributed at least one Resource Block is generated the step of data channel;
The communication terminal unit that has distributed at least one Resource Block is generated the step of specific control channel;
The communication terminal that has distributed at least one Resource Block is generated the step of common not specific control channel;
Generate the step for the broadcast channel of the broadcast message that communication terminal is notified;
In a plurality of frequency chunks that the frequency band that communication system is provided comprises, configuration broadcast channel in comprising the frequency chunks of centre frequency, and in a plurality of frequency chunks that the whole frequency band that communication system is provided comprises, dispose the step of not specific control channel, at least one specific control channel and at least one data channel; And
The step that will send from the output signal of the described step that is configured.
8. sending method as claimed in claim 7 is characterized in that,
In the specific control channel that in the step that generates described specific control channel, generates, comprise the information relevant with the data modulation system.
9. sending method as claimed in claim 7 is characterized in that,
In the specific control channel that in the step that generates described specific control channel, generates, comprise the information relevant with coded system.
10. sending method as claimed in claim 7 is characterized in that,
In the specific control channel that in the step that generates described specific control channel, generates, comprise and mix the relevant information of repeating transmission control mode.
11. any described sending method as claim 7 to 10 is characterized in that,
In the described step that is configured, make at least one data channel carry out time-multiplexed to not specific control channel and at least one specific control channel.
12. any described sending method as claim 7 to 10 is characterized in that,
In the described step that is configured, the same configuration call channel with data channel.
Applications Claiming Priority (9)
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| JP127987/2006 | 2006-05-01 | ||
| JP2006127987A JP4373410B2 (en) | 2006-01-18 | 2006-05-01 | Transmitting apparatus and transmitting method |
| JP2006272347A JP4373422B2 (en) | 2006-01-18 | 2006-10-03 | Transmitting apparatus and transmitting method |
| JP272347/2006 | 2006-10-03 | ||
| JP2006298312A JP4373426B2 (en) | 2006-01-18 | 2006-11-01 | Transmitting apparatus and transmitting method |
| JP298312/2006 | 2006-11-01 | ||
| PCT/JP2007/050262 WO2007083569A1 (en) | 2006-01-18 | 2007-01-11 | Base station, communication terminal, transmission method and reception method |
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| CN201110371003.2A Division CN102368872B (en) | 2006-01-18 | 2007-01-11 | Transmission device and transmission method |
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| JP5122529B2 (en) * | 2009-06-23 | 2013-01-16 | 株式会社エヌ・ティ・ティ・ドコモ | Mobile terminal apparatus, radio base station apparatus, radio communication method, and radio communication system |
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| CN101405950A (en) | 2009-04-08 |
| JP2009273181A (en) | 2009-11-19 |
| JP4966345B2 (en) | 2012-07-04 |
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