CN101204031B - Systems and methods for OFDM channelization - Google Patents

Systems and methods for OFDM channelization Download PDF

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Publication number
CN101204031B
CN101204031B CN200680017818.8A CN200680017818A CN101204031B CN 101204031 B CN101204031 B CN 101204031B CN 200680017818 A CN200680017818 A CN 200680017818A CN 101204031 B CN101204031 B CN 101204031B
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sub
channel
diversity
tree
ofdm
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CN101204031A (en
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张航
马江镭
贾明
索菲·维兹克
房慕娴
俞东生
许华
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Nortel Networks Ltd
Apple Inc
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Nortel Networks Corp
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Priority to CN201310048966.8A priority Critical patent/CN103179072B/en
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Abstract

Systems and methods for OFDM channelization are provided that allow for the co-existence of sub-band channels and diversity channels. Methods of defining diversity sub-channels and sub-band sub-channels are provided, and systematic channel definition and labeling schemes are provided.

Description

The system and method that is used for the OFDM channelizing
Related application
The application requires formerly U.S. provisional application: the No.60/666 that on March 30th, 2005 proposed, 548,60/710 of proposition on August 23rd, 2005,527,60/741 of the proposition on December 2nd, 60/728,845,2005 that on December 21st, 2005 proposed, 60/751,101 the priority that proposed on December 16th, 923 and 2005.
Technical field
The present invention relates to be used in the channelizing system and method such as in OFDM (OFDM) system of OFDM wireless network.
Background technology
Conventional ofdm system adapts to the travelling carriage of slow movement in the mode of utilizing the fact that may follow the trail of the decline in frequency domain and the time domain.In order to utilize the channel of slow variation, carry out sub-band scheduling in order to be the set of an adjacency of each mobile assignment subcarrier.In the case, each subband travelling carriage is typically given each subband or only is best subband report Carrier interference ratio, is specified by the base station in the quantity of this frequency band that will report.
Conventional ofdm system adapts to the travelling carriage of fast moving equally.So that can not carry out channel sensitive scheduling, the subcarrier that distributes on whole bandwidth is assigned with when move too fast of travelling carriage.In the case, travelling carriage report Whole frequency band CIR rather than subband CIR.
Conventional implementation method for the treatment of the travelling carriage of mobile at a slow speed travelling carriage and fast moving has to have some to be exclusively used in the transmission cycle of mobile at a slow speed travelling carriage always, and other the transmission cycle that the travelling carriage of the fast moving of being exclusively used in is arranged.An example of this method has been shown among Figure 34, wherein for the decomposition between the mobile assignment resource of mobile at a slow speed travelling carriage and fast moving demonstrates the frequency that has in the vertical access 10, and the time on the trunnion axis 12.In some time interval 14, whole frequency band is used to support have the channel of the subcarrier of distribution, and other the time interval 15 is used to support the channel that utilizes subband to realize.
Summary of the invention
According to the aspect of a broad sense, the invention provides a kind of method, comprising: utilize a plurality of subcarriers in the OFDM frequency band to transmit the OFDM symbol; Described OFDM symbol jointly comprises diversity channel and sub-band channel, and each diversity channel utilizes the subcarrier of a plurality of leap OFDM frequency band distributions, and each sub-band channel is utilized one group of subcarrier of adjacency in the OFDM frequency band; At least some of described OFDM symbol comprise the subcarrier that is utilized by sub-band channel and the subcarrier that is utilized by diversity channel simultaneously.
In certain embodiments, described method also comprises: described a plurality of subcarriers are further divided into Resource Block, and each Resource Block comprises the contiguous subcarrier of the fixed qty at least one OFDM symbol duration; Use or distribution channel is used that one of them integrally utilizes each Resource Block for sub-band channel.
In certain embodiments, described method also comprises: the mode with statically definition is used each resource block assignments or the distribution channel use to sub-band channel.
In certain embodiments, described method also comprises: the mode that changes with in time past is used to sub-band channel by each resource block assignments or distribution channel is used.
In certain embodiments, described method also comprises: for the set of the OFDM symbol of professional each fixed size transmits at least one with reference to the OFDM symbol.
In certain embodiments, each diversity channel comprises a plurality of Resource Block with frequency interval.
In certain embodiments, the described a plurality of Resource Block with frequency interval that are used for given diversity channel are transmitted simultaneously.
In certain embodiments, the described a plurality of Resource Block with frequency interval for given diversity channel are transmitted during different OFDM symbols.
In certain embodiments, for utilizing a plurality of subcarriers in the OFDM frequency band, each execution of a plurality of antennas transmits the OFDM symbols, described method also comprises: for each antenna, transmit scattered pilots collection separately, described scattered pilots collection is transmitted so that can the phase mutual interference.
In certain embodiments, described method also comprises: for each antenna, transmit at least one with reference to the OFDM symbol; And for the professional OFDM assemble of symbol of each fixed size, during described reference symbol, transmit described scattered pilots.
In certain embodiments, described method also comprises: for the services sets of each fixed size transmits at least one with reference to the OFDM symbol; And for each antenna, during described reference symbol, transmit some scattered pilots collection separately, and during service symbol, transmit some scattered pilots.
In certain embodiments, for each antenna described scattered pilots is inserted the Diamond spot system of battle formations.
In certain embodiments, described method also comprises: by with described a plurality of OFDM subcarriers take the frequency partition that transmits through M 〉=1 sub-slots in time as N 〉=2 subband, definition comprises the time slot in N * M Resource Block space, and each sub-slots comprises L 〉=1 an OFDM symbol; For diversity channel uses or sub-band channel is used that one of them integrally distributes each Resource Block.
In certain embodiments, described method also comprises: for each time slot, at first use distributes resource blocks for sub-band channel, then distribute the surplus resources piece for diversity channel uses.
In certain embodiments, described method comprises: for each time slot, the subcarrier of remaining Resource Block defines a diversity subchannel after utilizing sub-band channel to distribute, and then distributes at least one diversity subchannel for each diversity channel that will be transmitted during this time slot.
In certain embodiments, described diversity subchannel is systematically defined so that given sub-band channel is distributed one group of remaining Resource Block afterwards, and the result is same diversity subchannel always.
In certain embodiments, utilization has the sub-channelizing tree of multilayer the diversity subchannel is distributed to diversity channel, wherein the top layer in this tree comprises a plurality of nodes, each node represents single diversity subchannel, and each succeeding layer in this tree comprises one or more nodes, each node in the succeeding layer has merged the node of at least two front one decks, and expression is by all represented subchannels of described at least two nodes of this front one deck.
In certain embodiments, each diversity channel comprises one group of one or more diversity subchannel that represented by the corresponding individual node in the described sub-channelizing tree.
In certain embodiments, described method also comprises: by transmitting so that the delivering diversity channel definition signal that each diversity channel is associated with corresponding individual node in the described sub-channelizing tree, and for user identifier of each diversity channel transmission.
In certain embodiments, each diversity subchannel comprises: accordingly at least one subcarrier in the sub-carrier positions in each available Resource Block of diversity channel use.
In certain embodiments, utilization sets to define the diversity subchannel based on the sub-channelizing of the subcarrier in single subband residue-space-Shi (leftover-space-wise) sub-channelizing.
In certain embodiments, utilize sub-band channel distribute after the subcarrier of remaining Resource Block define a diversity subchannel and comprise and carry out residue-space-formula channelizing.
In certain embodiments, after utilization distributes based on sub-band channel in given time slot in the remaining Resource Block can with the sub-channelizing of all subcarriers set to define the diversity subchannel, and distribute diversity channel to transmit at the diversity subchannel as the basis take slotted mode.
In certain embodiments, utilize after distributing based on sub-band channel in given time slot in the remaining Resource Block can with the sub-channelizing of all subcarriers set to define the diversity subchannel, and as the basis diversity channel is distributed to subchannel in the sub-slots mode.
In certain embodiments, each diversity subchannel comprises the OFDM subcarrier on separately one group of a plurality of continuous OFDM symbol.
In certain embodiments, each diversity subchannel transmits on a plurality of OFDM symbols, and comprises one group of OFDM subcarrier that changes in the systematization mode in described a plurality of OFDM symbols separately.
In certain embodiments, described method also comprises: transmit the signaling information which Resource Block indication distributes can use diversity channel to sub-band channel and which piece.
In certain embodiments, transmitting signaling information comprises: be transmitted as the two-dimensional bitmap which Resource Block the indication of NxM Resource Block space distributes can use diversity channel to sub-band channel and which piece.
In certain embodiments, transmitting signaling information comprises: transmit and be included as the one dimension bitmap whether each subband indication sub-band channel will be comprised in the single position in this subband; For each position in the described one dimension bitmap, transmit the information of identification number of users, and be each user, transmit the information of the initial sub-slots index of identification and sub-slots quantity.
In certain embodiments, described method also comprises: give unique realm identifier of each resource block assignments, and transmit described realm identifier to indicate this zone just being used to sub-band channel.
In certain embodiments, described method also comprises: be each sub-band channel and each diversity channel, transmit user identifier separately.
In certain embodiments, utilize sub-band channel distribute after the subcarrier of remaining Resource Block define a diversity subchannel and comprise: for each time slot, the corresponding diversity set of sub-channels of the subcarrier that can use this time slot is used in definition; The sub-channelizing that the permission of this subchannel of the synthetic definition of all groups of subchannels is made up is set.
In certain embodiments, described method also comprises: utilize the continuous OFDM symbol in time slot of time domain tree identification; Utilize the identification of frequency domain tree in abutting connection with subband; Utilize the combination of time domain tree and frequency domain tree to define each sub-band channel.
In certain embodiments, the continuous symbol that always comprises the first symbol in this time slot in time slot of described time domain tree identification.
In certain embodiments, described method comprises that also by carrying out following steps one of them defines the title of each possible sub-band channel: for each the node range of distribution ID in the time domain tree be frequency domain each node range of distribution ID in setting; Be each the node range of distribution ID in the time domain tree and the node that utilizes in the bitmap identification frequency domain tree; Utilize the node in the bitmap identification time domain tree and be each the node range of distribution ID in the frequency domain tree; Utilize node and the node that utilizes in the second bitmap identification frequency domain tree in the first bitmap identification time domain tree; Utilize bitmap to identify the combination that each possible time domain tree node adds the frequency domain tree node; Add the combination range of distribution ID of frequency domain tree node for each time domain tree node.
In certain embodiments, described method also comprises: identify sub-band channel by following steps: transmit the information which Resource Block of identification can be used for sub-band channel; Utilize systematic naming method agreement name one or more each arrangement in abutting connection with subband on one or more continuous sub-slots; For each sub-band channel, with user identifier with come self-identifying to distribute to the title of the systematic naming method agreement of the one or more particular arrangement in abutting connection with subband on this user's the one or more continuous sub-slots.
In certain embodiments, transmit the information which Resource Block of identification can be used for sub-band channel and comprise traffic bit figure.
In certain embodiments, described method comprises: utilize all a plurality of OFDM subcarrier definition subband subchannels; Utilize all a plurality of OFDM subcarrier definition diversity subchannels; For each sub-band channel is distributed one or more subband subchannels; For each diversity subchannel distributes one or more diversity subchannels.
In certain embodiments, described method also comprises: existing in the situation of conflict between the sub-band channel on the given subcarrier and the diversity channel, transmit the described sub-band channel on the described subcarrier.
In certain embodiments, described method also comprises: utilize the subband sub-channelizing tree in time and the frequency that the permission that the subband groups of subchannels is made into sub-band channel is made up; Utilize the diversity subchannel tree in time and/or the frequency that the permission that the diversity groups of subchannels is made into diversity channel is made up.
In certain embodiments, described method also comprises: utilize bitmap or area identifiers to be used as sub-band channel with the combination of which permission of indication subband basic access unit, and the combination of which permission of diversity subchannel is used as diversity channel.
In certain embodiments, described method also comprises: for each sub-band channel or diversity subchannel, transmit corresponding user identifier.
In certain embodiments, described method also comprises: activate by following steps operating part tree: utilize corresponding sub-channelizing tree groups of subchannels to be made at least permission channel of one of them that defines for diversity channel definition and sub-band channel; For at least one sub-channelizing tree, activate a part of subchannel tree and transmit the information of identifying this part; This part allocated channel from this subchannel tree.
In certain embodiments, activate a part of subchannel tree and comprise one group of continuous layer determining in this tree of activation.
In certain embodiments, activate a part of subchannel tree and comprise that the corresponding pantostrat that activates in this tree makes up for each combination of each combination of the top node of at least one definition.
In certain embodiments, the combination of pantostrat is by corresponding top layer and corresponding bottom definition for each top node.
In certain embodiments, this group pantostrat is by the bottom definition separately of this top node and this top node.
In certain embodiments, activating a part of subchannel tree comprises: the subset of utilizing the effective node in the first bitmap recognin channelizing tree.
In certain embodiments, described method also comprises: which node that utilizes the second bitmap to identify in the subset of this node is assigned with, and for each node that is assigned with, distributes a user identifier.
In certain embodiments, described method also comprises: upgrade every now and then described partial tree and activate.
In certain embodiments, upgrading every now and then described partial tree activation comprises: only the section that has changed for this tree transmits lastest imformation.
In certain embodiments, described method comprises: the indication of this section that transmission will change for each section that will change; Transmission is for the active information of the renewal of this section.
In certain embodiments, described method also comprises dynamic closed portion bandwidth resources.
In certain embodiments, described method also comprises dynamic closed portion bandwidth resources.
In certain embodiments, described method also comprises the pent information of which resource of identification that transmits.
In certain embodiments, transmit which resource of identification pent information comprise one of following: transmit the pent two-dimensional bitmap of which Resource Block of indication; Transmit the pent one dimension bitmap of which subband of indication; Transmit which subband of indication and put pent one dimension bitmap in certain of this time slot, and transmit their pent additional informations when in this time slot of indication.
In certain embodiments, described method also comprises: dispatch each receiver to sub-band channel or the diversity channel function as the information that receives from receiver.
In certain embodiments, described method also comprises: be each receiver definition priority; Attempt each receiver of sequential scheduling according to priority.
In certain embodiments, each receiver of sequential scheduling of attempting according to priority comprises: if this receiver is the sub-band channel receiver, then attempt to be receiver allocated subbands channel; If this receiver is the diversity channel receiver, then attempt to distribute diversity channel for receiver.
In certain embodiments, attempt to comprise for receiver allocated subbands channel: the selection of the sub-channels that the reception receiver has been selected or selected a plurality of subchannels; If selected subchannel can be used, determine then whether utilize selected subchannel to dispatch this receiver will affect the diversity user who has been scheduled, and if do not affect the receiver of this available selected subband of scheduling use then; If selected subband can be used, and scheduling uses the receiver of this selected subband will affect the diversity user who has been scheduled, then attempt to reschedule the diversity user that at least one is affected, if success then reschedules the receiver that uses this available selected subband.
In certain embodiments, described method also comprises: some resources of enduringly assignment in a plurality of time slots, and other resource of impermanently assignment.
In certain embodiments, described method also comprises: in some resources of enduringly assignment of beginning of each time slot, how many resources utilize this persistent assignments or not afterwards to send indication has by the information of persistent assignments.
In certain embodiments, described method also comprises: utilize asynchronous HARQ to be used for retransmitting, and to each higher priority of grouping of dividing the non-re-transmission of component proportion that is retransmitted.
In certain embodiments, described method also comprises: for given dispatching cycle, the assignment subset channel is until an assignment threshold value.
In certain embodiments, for given dispatching cycle, the assignment sub-band channel until an assignment threshold value comprise: at first assignment sub-band channel is until this assignment threshold value; Utilize sub-band channel to distribute afterwards remaining subcarrier definition diversity channel.
In certain embodiments, for given dispatching cycle, the assignment sub-band channel until an assignment threshold value comprise: the assignment sub-band channel is until this assignment threshold value; Utilize all OFDM subcarriers definition diversity subchannels, and with the diversity subchannel assignment to diversity channel; Be transmitted in each breakdown diversity channel in the sub-carrier positions common between the sub-band channel of diversity channel and distribution.
In certain embodiments, described method also comprises: for VoIP business enduringly assignment subband or diversity channel transfer resource.
In certain embodiments, described method also comprises: by calling out one of two MCS of beginning assignment (modulation and encoding scheme) layer, if and detect CQI in the average report of receiver great changes have taken place then only change the MCS layer, use one of two MCS layer VoIP business.
In certain embodiments, described method also comprises: if travelling carriage has been reported the CQI of the MCS that is mapped to the MCS that is higher than operation, then transmitting power is reduced by one to the specified amount of the difference of two MCS layers; And if travelling carriage reported the CQI of the MCS that is mapped to the MCS that is lower than operation, then do not carry out power adjustments.
According to the aspect of another broad sense, the invention provides a kind of method, comprising: utilize a plurality of subcarriers in the OFDM frequency band to receive the OFDM symbol; This OFDM symbol jointly comprises diversity channel and sub-band channel, a plurality of subcarriers that each diversity channel utilization distributes at the OFDM frequency band, and each sub-band channel is utilized the sub-carrier set of the adjacency in the OFDM frequency band; At least some OFDM symbols comprise the subcarrier that is utilized by sub-band channel and the subcarrier that is utilized by diversity channel simultaneously; Receive the signaling information of indicating to extract which diversity channel or sub-band channel.
In certain embodiments, described method also comprises: receive and allow to determine that diversity channel and sub-band channel are the signaling informations how to define.
In certain embodiments, this signaling information comprises the sign that is taken by sub-band channel about which subcarrier, and this diversity channel utilizes remaining subcarrier to come system definition.
In certain embodiments, receiver is suitable for realizing the method for above-mentioned conclusion.
In certain embodiments, transmitter is suitable for realizing the method for above-mentioned conclusion.
According to the aspect of another broad sense, the invention provides a kind of transmitter, comprising: produce the OFDM modulator that the OFDM symbol is used for transmission from a plurality of inputs; With sign map to the input of OFDM modulator so that the OFDM symbol jointly comprises the channelizer of diversity channel and sub-band channel, a plurality of subcarriers that each diversity channel utilization distributes at the OFDM channel, and each sub-band channel is utilized the sub-carrier set of the adjacency in the OFDM channel, so that at least some OFDM symbols comprise the subcarrier that is utilized by sub-band channel and the subcarrier that is utilized by diversity channel simultaneously.
According to the aspect of another broad sense, the invention provides a kind of system, comprising: at least one transmitter and at least one receiver; This at least one transmitter and at least one receiver utilization jointly comprise the OFDM symbolic communication of diversity channel and sub-band channel, a plurality of subcarriers that each diversity channel utilization distributes at the OFDM channel, and each sub-band channel is utilized the sub-carrier set of the adjacency in the OFDM channel, so that at least some OFDM symbols comprise the subcarrier that is utilized by sub-band channel and the subcarrier that is utilized by diversity channel simultaneously.
Description of drawings
With reference now to accompanying drawing, the preferred embodiments of the present invention are described, wherein:
Figure 1A and 1B take into account the two the OFDM symbolic construction figure of coexistence of sub-band channel and diversity channel;
Fig. 2 is that wherein the OFDM subcarrier is divided into the OFDM frame assumption diagram of subband, and each subband is assigned to one of them sub-band channel that diversity channel uses and uses;
Fig. 3 is wherein assignment further is broken down into three different diversity channels for the subcarrier of the diversity channel use of Fig. 2 frame assumption diagram;
Fig. 4 is another OFDM frame assumption diagram, and it shows in each group that is made of 7 OFDM symbols, and the two all is assigned the pilot tone that is inserted in the OFDM symbol diversity channel and sub-band channel;
Fig. 5 is the frame assumption diagram that again shows the coexistence of sub-band channel and diversity channel, also comprises in the case pilot tone and the control channel of a dispersion;
Fig. 6 is a form, shows the exemplary parameter for the subband definition;
Fig. 7 and Fig. 8 are that wherein the OFDM subcarrier is divided into subband, and the OFDM symbol of given time slot is divided into the exemplary frame structure figure of sub-slots;
Fig. 9 A and 9B utilize the sub-channelizing tree to carry out the diagram of two distinct methods of sub-channelizing;
Figure 10 is that the subcarrier definition that given subchannel is distributed in signal is the diagram of frequency hopping of how can passing in time;
Figure 11 is the schematic diagram of sub-channelizing tree node name;
Figure 12 is the exemplary plot of the diversity subchannel definition that remaining subcarrier occurs after utilizing sub-band channel to distribute;
Figure 13 is the schematic diagram that shows another example that utilizes the diversity subchannel definition of remaining subcarrier after the allocation of subbands;
Figure 14 is the schematic diagram of another example of the diversity subchannel definition of remaining subcarrier after utilizing sub-band channel to distribute;
Figure 15 is the schematic diagram of utilization another example of the diversity subchannel definition of remaining subcarrier after the sub-band channel distribution;
Figure 16 is the schematic diagram of utilization another example of the diversity subchannel definition of remaining subcarrier after the sub-band channel distribution;
Figure 17 is another example of diversity subchannel definition;
Figure 18 is the example of diversity sub-channelizing tree that utilizes the definition of Figure 17;
Figure 19 is with the schematic diagram of resource block assignments to the example of sub-band channel;
Figure 21 is the instance graph of sub-band channel resource block assignments with two examples of operable naming method;
Figure 22 is the diagram that signal is used for another naming method of name sub-band channel;
Figure 23 A and 23B are other examples of sub-band channel definition and name;
Figure 24～26 are diagrams of three different diversity sub-channelizing examples, and wherein all subcarriers all are used to the diversity sub-channelizing and no matter whether distributed sub-band channel;
Figure 27～32nd illustrated how the simplification part of an overall tree can be applied to reducing required signaling amount, and how to be realized the view to the renewal of this tree;
Figure 33 is the instance graph of the interim cut-out subband in this overall OFDM resource;
Figure 34 is the view that does not take into account the OFDM transmission collection that sub-band channel and diversity channel coexist at single OFDM symbol;
Figure 35 is the block diagram of cellular communication system;
Figure 36 is the block diagram of the exemplary base of some embodiment that can be used in the present invention;
Figure 37 is the block diagram of the example wireless terminal of some embodiment that can be used in the present invention;
Figure 38 is the logical breakdown block diagram of the exemplary OFDM transmitter architecture of some embodiment that can be used in the present invention;
Figure 39 is the logical breakdown block diagram of the exemplary OFDM receiver architecture of some embodiment that can be used in the present invention;
Figure 40 is the flow chart of scheduling diversity user and subband user's illustrative methods.
Embodiment
A broad aspect of the present invention provides a kind of OFDM channelizing system and method, and wherein sub-band channel and diversity channel transmit in same OFDM symbol simultaneously.Each sub-band channel is used the subcarrier of one group of adjacency.Each diversity channel comprises one group of incomplete vicinity and is the subcarrier of diversity in whole frequency band.In this general sense of usually using non--adjacency, at least some gaps are arranged between some subcarriers namely.
Figure 1A shows according to an embodiment of the invention the coexistence of two types channel.In this example, some subcarrier is unified in the indication of 20 places, be exclusively used in diversity channel, and some subcarrier is unified in the indication of 22 places, is exclusively used in sub-band channel.Can find out that during any given OFDM mark space, for example the OFDM symbol 24, diversity channel and sub-band channel are supported simultaneously.In this particular instance of illustrating, the OFDM sub-carrier set is divided into a plurality of subbands of each subcarrier that all includes fixed qty, and the total OFDM resource in time and the frequency domain is divided into Resource Block, and each Resource Block is comprised of the subband (frequency) on the OFDM mark space of fixed qty (one or more).When Resource Block is assigned when using for sub-band channel, all subcarriers of this Resource Block all are assigned to same sub-band channel.In some implementations, a given sub-band channel only allows to take single subband; In other was realized, a sub-band channel can take maximum two adjacent sub-bands.In other was realized, a given sub-band channel was allowed to take a plurality of adjacent sub-bands of any amount.The below provides the Multi-instance of sub-band channel definition.When Resource Block is assigned when using for distributed channel, a plurality of distributed channels can use this Resource Block and other Resource Block, and perhaps single distributed channel can use whole Resource Block together with other non-conterminous Resource Block.The below provides the Multi-instance of distributed channel definition.In certain embodiments, the resource block size is selected as the function of coherence bandwidth, so that all experience similar channel for the whole subband set of sub-band channel.In case whole sub-carrier band all is assigned to Resource Block, so each Resource Block just can be applied in the structure of diversity or sub-band channel fully.In the example of Figure 1A, this distribution can not change from an OFDM symbol duration (on the time orientation) to another OFDM symbol duration.In another embodiment, shown in the example of Figure 1B, resource block assignments can be changed in time to diversity channel or sub-band channel.In Figure 1B, can find out during OFDM mark space 26, have 4 Resource Block to be used to diversity channel and to have 3 Resource Block to be used to sub-band channel, and during OFDM mark space 28, have 4 Resource Block to be used to sub-band channel and to have 3 Resource Block to be used to diversity channel.In addition, it can also be seen that the distribution of Resource Block changes as the basis take each OFDM symbol.Figure 1A has been used to illustrate in time with the particular instance of the resource block assignments of statistical definition.The in time quantity of fixing Resource Block and assignment is to realize specific parameter.Similarly, for the example of Figure 1B, show a kind of very special layout for the Resource Block of the diversity channel of the sub-band channel that changes in time, for example passed through dynamic assignment.Generally speaking, can use any suitable Resource Block layout to these two kinds of channel types.
With reference now to Fig. 2, another example of this channel of two types coexistence is described.In this example, the OFDM symbol is divided into TTI (Transmission Time Interval).Shown in example in, each TTI is comprised of 7 continuous OFDM symbols.But, certainly can use the symbol of any amount.Wherein a kind of such TTI indicates at 30 places.First symbol in each TTI namely for the symbol 32 of first TTI, is used as reference symbol.This may for example comprise pilot tone and control information.Generally speaking, each TTI has at least one reference symbol, and all the other 6 OFDM symbols 34 are used to Traffic Channel.In frequency direction, the available bandwidth of subcarrier is divided into Resource Block.In a particular instance, each Resource Block can comprise 25 subcarriers.Then, each Resource Block is allocated for sub-band channel or diversity channel.In the example of illustrating, Resource Block 36 is used to sub-band channel and Resource Block 38 is used to diversity channel.In this particular instance, resource block assignments is fixed to sub-band channel and diversity channel, but in another is realized, can allow to change, just as the situation in the example of Figure 1B.In the example of Fig. 2, reference symbol is inserted in TDM (time division multiplexing) mode, and wherein per 7 symbols are a reference symbol, but can use different frequency.
With subcarrier and the assignment of OFDM symbol duration to subband or diversity mode after, have the various ways that utilizes assigned subcarrier definition diversity subchannel.With reference now to Fig. 3, describe first example, in Fig. 3, reference symbol insertion, TTI size and resource block assignments hypothesis are with described identical with reference to figure 2.In the case, 3 the different diversity channels that utilized the resources definition distribute, the resource that minute is used in the first channel is indicated at 46 places.It is comprised of following Resource Block: two OFDM symbols 40 arrive the single resource piece during the TTI, and lower two OFDM symbols 42 arrive the single resource piece during the TTI, and two OFDM symbols 44 arrive single resource piece 50 during the TTI again.The frequency location of 3 Resource Block that forms diversity channel is different, and Here it is why channel is considered to the reason of diversity channel.Show the similar distribution of Resource Block for channel 48 and 50.Shown in example in, all fix to the channel allocation of next TTI from a TTI, but needn't be always like this.What be readily appreciated that is, utilizes the model of Fig. 3, supposes to use to diversity channel and has distributed enough resources, then can create the diversity channel of any amount.In addition, as the situation shown in the example of Fig. 2, the quantity of the OFDM symbol in each TTI and the quantity of the subcarrier in each Resource Block are considered to realize the specific details of institute.
With reference now to Fig. 4,, Fig. 4 shows another example of the coexistence of subband and diversity channel.By this example, available subcarrier is divided into Resource Block again.In the example of illustrating, each Resource Block is divided into 8 subcarriers, but can adopt other quantity.The OFDM symbol 60 of each TTI is used as reference symbol, and the reference symbol of illustrating in this particular instance is used to the frequency pilot sign insertion.In the example of illustrating, suppose that the MIMO transmission has 4 transmitting antennas.Pilot tone has been inserted into corresponding distributed sub-carrier collection, and these sub-carrier set are assigned with the pilot tone as each antenna.In the particular instance of this signal, the first subcarrier and per 4 subcarriers afterwards are used to the first antenna; The second subcarrier and per 4 subcarriers afterwards are used to the second antenna, and the rest may be inferred.In the frequency of a pilot tone of an antenna transmission, other antenna transmission is empty.Before next symbol comprised pilot frequency information, OFDM symbol 62 was used to transfer of data.As the situation in the last example, several Resource Block 64 are assigned for sub-band channel, and several Resource Block 66 are assigned for diversity channel.In this example, subcarrier is used to 3 different diversity channels that assignment is indicated to be implemented in 68,70,72 places for diversity channel.In this example, two OFDM symbols 47 are used to the first diversity subchannel; Lower two OFDM symbols 76 are used to the second diversity subchannel 70, and the 3rd pair of OFDM symbol 78 is used to the 3rd diversity channel 72.Use at these channels on the meaning of subcarrier of Resource Block 66 of comfortable whole spread spectrum, they remain diversity channel.Comparatively speaking, for sub-band channel, one or more Resource Block will be assigned to given user.Frequency decomposition between subband and the diversity channel can with many antenna scenario in identical.Yet, generally speaking, the decomposition between sub-band channel and the diversity channel needn't with the multiple transmit antennas situation in identical, and can define as the basis take each antenna.Shown a particular instance in Fig. 4, it is suitable for 4 system of transmit antennas.Certainly, can be to having still less or the back-up system of the antenna of greater number is done suitable correction.In addition, the specified arrangement of sub band resources piece and diversity Resource Block only is an example.Similarly, the quantity of the subcarrier in the size of TTI 62 and each Resource Block also is to realize the specific details of institute.
For being used for the OFDM symbol of pilots insertion among Fig. 4, for a given OFDM subcarrier, only individual antenna is launched a pilot tone.In this way, between from the pilot tone of each antenna, do not disturb.Therefore, pilot tone is dispersed among the embodiment of Fig. 4, wherein has the interval of 4 subcarriers and the interval between per 7 OFDM symbols between the pilot tone of given antenna.Generally speaking, the pilot design of dispersion be to frequency and on the time each antenna at interval comprise a design of pilot tone.Fig. 5 shows another example of the pilot design of dispersion, and the pilot tone that wherein is used for each antenna is inserted into rhombohedral lattice, and wherein antenna 1,2,3 and 4 pilot tone are indicated at 90,92,94 and 96 places respectively.The structure of the channel among Fig. 5 is 6 OFDM symbols, 100 compositions for business by the reference OFDM symbol 98 as control channel afterwards.For this example, control channel is used to launch the identical content from all antennas.The specific decomposition that is used for professional OFDM symbol 100 is identical with the situation of Fig. 4 example, and wherein sub-band channel is indicated at 120 places, and 3 diversity channels are indicated at 104,106 and 108 places.Yet, in the case, the rhombohedral lattice pilot frequency design punctured control channel 98 and data channel 100 the two.First punctures option is to have the pure puncture of being ignored simply from the actual content of each data channel.In the case, forward error correction coding or other error correcting technique must be employed so that the content that can recover to lose.Another option is the payload size that changes the channel with puncture place.For example, for the first subchannel 102, can find out do not having in the situation of pilots insertion, will have a data position, OFDM symbol=48,8 subcarrier * 6.When having carried out puncture, wherein 6 positions are removed, and therefore only have now 42 data positions.If payload reduces in size in proportion, then forward error correction needn't depend on and recover any information of losing, and is not owing to puncture any information of losing that pilot channel causes at least.In Fig. 5, shown a very specific example.It should be understood that the quantity for the OFDM symbol of the data of each time slot is to realize the specific details of institute; The quantity of OFDM subcarrier is to realize that institute is specific in each Resource Block; The specified arrangement of the pilot tone of scattering is to realize that institute is specific; Employed antenna amount is to realize that institute is specific; The configuration of sub-band channel and diversity channel and layout are to realize that institute is specific.
Fig. 6 is the form how the particular system bandwidth can be used for the various examples of realization OFDM channelization structure.
Another general method being used for channelizing is called as " time slot " dispatching cycle, and this time slot is comprised of the individual OFDM symbol of one group of L (L 〉=1).
All carrier waves in a time slot (time domain) and the whole frequency band (frequency domain) are regarded as the subcarrier pond.Time slot in the time domain is divided into M sub-slots, and each sub-slots comprises one or more continuous OFDM symbols or symbol pair.Whole frequency band (frequency domain) is divided into N subband, and each subband comprises the subcarrier of a plurality of adjacency.Therefore, the subcarrier pond is divided into MxN Resource Block space effectively, and wherein each Resource Block comprises the subcarrier of one or more sub-slots and a plurality of adjacency.The duration of sub-slots is equivalent to the duration of Resource Block.Can upgrade M and N dynamically or take several time slots as basic service based statistical static ground based on time slot, M 〉=1 wherein, N 〉=2.
Consider that having inserted other OFDM symbol is used for reference, pilot tone or control, how the example that provides up to now meets this vague generalization is obviously.Two particular instances of Resource Block definition have been provided among Fig. 7.First example in 120 places indications, relates to the sub-carrier space with 48 subcarriers usually, and the slot length that is comprised of 8 OFDM symbols.This time domain time slot is divided into M=2 sub-slots, and each sub-slots comprises 4 OFDM symbols, and frequency domain is divided into N=4 subband, and each subband comprises the subcarrier of 12 adjacency.The result has consisted of one 4 * 2 Resource Block space.Second example usually in the indication of 122 places, comprises 8 same OFDM symbols of same group of 48 OFDM subcarriers and each time slot.In the case, all 8 OFDM symbols are used to define single sub-slots, and 48 OFDM subcarriers are divided into 8 subbands in frequency domain, and each subband comprises 6 OFDM subcarriers.Thus in this example, exist N=8 to multiply by the Resource Block space of M=1.
With reference to figure 8, there is shown another example of Resource Block definition, wherein 48 subcarriers on 8 OFDM symbols are divided into N=8 subband, and each subband has 6 OFDM subcarriers, and each comprises 2 sub-slots of 4 OFDM symbols for 8 * 2 Resource Block space.
After having defined the Resource Block space of N * M, so each Resource Block can be used for subband or distributed channel.
Time slot can be configured to comprise two types channel, i.e. sub-band channel and diversity channel.Sub-band channel comprises continuous group of one or more Resource Block.Diversity channel comprises a plurality of subcarriers, and these subcarriers are distributed on a plurality of Resource Block.The below will describe the Multi-instance how division between sub-band channel and the diversity channel realizes in a time slot.In some above-mentioned examples, at first assignment sub-band channel resource, then all interior remaining resource spaces of time slot just can be used for diversity channel.
Refer again to Fig. 8, in the example of illustrating, the single resource piece has been divided to be used in to create the first sub-band channel 130; 2 continuous Resource Block have been assigned to the second sub-band channel 132 in time, and 2 adjacent Resource Block have been allocated for the 3rd sub-band channel 133 on frequency domain.So remaining capacity just can be used for diversity channel.
Utilize the diversity channel definition of diversity sub-channelizing
In certain embodiments, remaining Resource Block is used to define a diversity subchannel after sub-band channel is distributed, and then each diversity channel is defined and comprises one or more diversity subchannels.Have the multiple option that is used for the diversity sub-channelizing, the below will describe several examples.In certain embodiments, the diversity subchannel is by system definition, so that given one group of available subcarrier always can cause identical diversity groups of subchannels.Make in this way, suppose that transmitter and receiver all knows this systematized definition that just is being employed, the given one group of subcarrier that can use for the diversity sub-channelizing, transmitter and receiver all will be known this sub-channel structure.The sub-channelizing tree method that the following describes is the example of this systematized subchannel define method.
In first example, carry out subband formula (sub-band-wise) sub-channelizing.By considering the subcarrier of at least one selection in the subband, the diversity subchannel is defined.This definition is then by required all Resource Block that can use diversity channel.In other words, this diversity subchannel comprises the corresponding subcarrier in the same position in each available subband of diversity channelization.For example, the diversity subchannel may be comprised of the first subcarrier to each available subband of diversity channelization.
In another option, carry out the channelizing of remaining space formula.By considering that all (after the subband assignment) the remaining subcarriers in one or more OFDM symbols define the diversity subchannel.
In certain embodiments, how many OFDM symbols are the diversity subchannel that comprises identical definition no matter cross over and will be comprised in the Resource Block and use.In other embodiments, the diversity subchannel is defined in the Resource Block and changes from an OFDM symbol to the next one, for example passes through frequency hopping.The below provides such example.
Along with the diversity subchannel that defined like this, consist of diversity channel according to one or more these subchannels.
In certain embodiments, wherein the channel definition is unfixed, and where the signaling that adopts is positioned at whole available resources so that each travelling carriage is known their certain content.In an example of this signaling, adopt a two-dimensional bitmap to be used to indicate sub-band channel and be positioned at where be positioned at comparison where with diversity channel.The below is an example for this two-dimensional bitmap of the resource assignation shown in Fig. 8, wherein:
N＝8，M＝2：
[1?0?1?0?0?0?0?0
0?0?1?0?0?1?1?0]
In this two-dimensional bitmap each " 1 " expression just is being assigned the Resource Block that uses to sub-band channel.Can find out that each " 1 " in the top bitmap is sub-band channel 130,132 shown in the corresponding diagram 8,133 how.Then, in the two-dimensional bitmap each, send the signal of user ID.For example, can followingly send user ID 1,2 and 3 signal for 5 " 1 " in this bitmap, occurring:
{User?ID＝1
User?ID＝2
User?ID＝2
User?ID＝3
User?ID＝3}
Whether another option being used for the resource assignation signaling can adopt the one dimension bitmap, indicate sub-band channel will be comprised in this subband take single position as each subband.The below is the example for this one dimension bitmap of the assignment of Fig. 8:
N＝8[1?0?1?0?0?1?1?0]
This situation indication the first, the 3rd, the 6th and the 7th subband is used for the sub-band channel user, but does not represent that this specific channel allocation is to so keeping each subband.For realizing this, to each position " 1 " in this one dimension bitmap, transmit the information of identification number of users, and to each user, transmit the information of initial sub-slots index and sub-slots quantity.
Be used for also option of resource assignation signaling, each Resource Block is given a corresponding regional ID.For the particular condition of the sub-slots of the subband of N=8 and M=2, always have 16 Resource Block and 4 positions can be used for identified region ID.So for each zone, the signaling that is performed comprises regional ID and the user ID that will transmit in this zone.
In general, in the place that the channel definition can change, can transmit any suitable signaling information, which resource block assignments this signaling information makes it possible to determine to sub-band channel, and which Resource Block can be used diversity channel.Also can be each sub-band channel assignment and transmit user ID.
In certain embodiments, utilization has multilayer sub-channelizing tree and distributes to come the diversity subchannel, wherein the top layer in this tree comprises a plurality of nodes, each node represents single subchannel, and each succeeding layer in this tree comprises one or more nodes, and each node in the succeeding layer comprises all subchannels that at least two nodes of front one deck and representative are represented by this two nodes of this front one deck at least.The below provides specific example.So being defined, each diversity channel comprises one group of one or more subchannel that is represented by the corresponding individual node in the sub-channelizing tree.
In order to send the diversity channel definition signal, can transmit so that the information that the corresponding individual node in each diversity channel and the sub-channelizing tree is associated.Following specific example comprises bitmap and regional ID.
The below will be respectively describes two examples by the diversity channel of sub-channelizing definition with reference to figure 9A and 9B.These examples are all supposed the input of a subcarrier baseset, carry out sub-channelizing based on this baseset.The below provides the exemplary method of the baseset of definition subcarrier, says that the baseset of subcarrier may be with adjacency be just not enough.In these examples, by the subcarrier systematization definition diversity subchannel with use of K quantity, and utilize these K subcarriers to define the subchannel of L quantity.First option is to adopt the full-diversity tree method to define subchannel.Utilize the full-diversity tree method, if will will comprise a plurality of subcarriers in subchannel, then subchannel comprises non--contiguous subcarrier.The diversity tree method allows definition to comprise the sets of sub-channels of the subcarrier that quantity increases gradually.Utilize the example shown in Fig. 9 A, in the indication of 141 places, supposing has K=16 subcarrier usually.At the top layer of diversity tree, in the indication of 140 places, this K=16 subcarrier is used to define the L=16 sub-channels, is called sub-ch[16,0 usually] ..., sub-ch[16,15].Lower one deck in the diversity tree is indicated at 142 places usually.At this, defined 8 sub-channels and be marked as sub-ch[8,0] ..., sub-ch[8,7].Each of these subchannels is shown as two sub-channels that comprise from the top layer of this tree.Thus, in the second layer 142, sub-ch[8,0] comprise the 0th and the 8th subcarrier.Repeat this process for follow-up each layer in this hierarchy.In the example of illustrating, more layer 144,146 and 148 is arranged.Every sub-channels in the 3rd layer 144 comprises 4 subcarriers, and the every sub-channels in the 4th layer 146 comprises 8 subcarriers, and the individual node in the layer 5 148 comprises all subcarriers.What should be readily understood that is how this example that provides expands to the subcarrier K that covers any amount.Use this sub-channelizing definition, given diversity channel can be defined to comprise one or more these subchannels.
In second example shown in Fig. 9 B, usually in the indication of 150 places, adopted a kind of hybrid diversity tree method.Top layer in this diversity tree 152 is identical with the top layer 140 of first example 141.Yet, when generating the second layer, select from the adjacent sub-carrier of top layer pair.Thus, in the second layer 154, sub-ch[8,0] comprise two continuous subcarriers.After this, then the subchannel of the second layer 154 can define the 3rd layer 156, the 4th layers 158 and layer 5 160 in the diversity tree with combined with mode like first example class.Again be readily understood that how to expand the method that provides in the example 150 to cover the subcarrier of any amount.In addition, although in the example of illustrating, combined two continuous subcarriers, may comprise in another embodiment four continuous subcarriers, for example in the 3rd layer of diversity tree 156.For example, 2,4 or 8 contiguous set can be used to support the STTD transformat.Baseset for subcarrier is the application of adjacency, the method for Fig. 9 B considered to disturb and and the better estimation of channel status because there is the contiguous set of subcarrier.
In another example, the diversity subchannel comprises based on the subcarrier frequency hopping in the time domain of for example specific AD HOC in base station.A such example has been shown among Figure 10, wherein be the respectively following indication of subcarrier that given diversity subchannel is selected: at first pair of OFDM symbol of 162 places indication, the lower a pair of OFDM symbol of 164 places indication, 166 places indicate the 3rd pair of OFDM symbol, and indicate the 4th pair of OFDM symbol at 168 places.Subcarrier 162,164,166,168 is all in a subband.In this example, subband has 16 subcarriers, but is readily understood that how to expand this concept to the subcarrier of the interior any amount of subband.In Figure 10, expression formula (+12) %16 has defined the subcarrier frequency hopping that occurs for this particular instance.It means and is defining first sub-carrier positions (for example utilize sub-channelizing tree) afterwards, by current location is added 12 (this numeral 1 to 16 index may in abutting connection with or the subcarrier baseset of any definition of adjacency not) then carry out mould 16 computings and determine the right sub-carrier positions of next OFDM symbol.Utilize given example, can find out, can define 16 different subchannels on 4 pairs of OFDM symbols in a subband.In general, can adopt any suitable subcarrier hopping; Certainly should mechanism need to be deterministic at it can be on the meaning that receiver is reappeared.In the superincumbent example, the subcarrier frequency hopping is crossed over the OFDM symbol to occuring; In general, this frequency hopping can occur in the time interval of any definition of one or more OFDM symbols.
State in the use one of scheme and defined after the diversity subchannel, the definition diversity channel is to comprise one or more diversity subchannels.Can utilize addressing mechanism to identify diversity channel.In an example, this addressing can be based on the position in the sub-channelizing tree.Later with reference to the example among the figure 9, if single diversity channel only is one of them subchannel of speaking of in the second layer 142, so this diversity channel can utilize and allow any mechanism of this position in this tree of identification to identify.
With reference now to Figure 11, provides a particular instance of diversity channel addressing.For this example, have 8 subcarriers, these subcarriers have been used to be created in has 8 nodes in the ground floor 172, have 4 nodes in the second layer 174, in the 3rd layer 174, have 2 nodes, and in the 4th layer of 4 layers of diversity tree with 1 node.The first option is based on bitmap and carries out addressing.For the L=8 sub-channels in the ground floor, the large young pathbreaker of this bitmap is 15, because altogether only have 15 nodes in this tree.As providing bitmap as the situation of option of the signal that takies that sends available sub-band channel, can launch a bitmap to indicate which diversity channel occupied, together with the user ID of occupied subchannel.This combination will be specified the content of diversity channel fully.In another example, each node in this tree is assigned with one " regional ID ", because 15 nodes are arranged, and can be with 4 each nodes of identifying uniquely in this tree.For example, in the example of illustrating, regional ID " 0010 " identifies one of them node in this tree the 3rd layer.Can find out that the diversity channel with this zone ID will comprise subcarrier 8,10,12 and 14.Any diversity subchannel definition how bitmap and regional ID method can be applied to propose up to now is apparent.
In certain embodiments, all subchannel definition described above are applied to can be used for all subbands of diversity transmission, and during given time slot or sub-slots, same user is assigned with this combination ability.Provide one of them example referring now to Figure 12, comprising 2 sub-slots 182,184 and comprise in the given time slot 180 of 8 subbands 186～200, as shown in 202,204,206 distributed 3 subband users.The residue subband is used to the diversity sub-channelizing.Shown in example in, each frequency band comprises 8 subcarriers, and can be as such use the shown in usually be similar to this sub-channelizing of describing with reference to Figure 11 at 208 places.By same sub-channelizing being applied to be not yet assigned to subband user's all sub-slots and subband, can define a plurality of diversity channels.Illustrate by way of example two kinds of specific diversity channels, its sub-carriers 201 is used to define the first diversity channel, and subcarrier 212 is used to define the second diversity channel.In the case, this distribution is take time slot as the basis, and wherein sub-channelizing is applied to whole time slot, then is assigned to given diversity channel.For continuous OFDM symbol for, the subcarrier that is assigned in this example each subband be offset each other a subcarrier ground between two groups alternately, this just above with reference to an example of the described frequency hopping of Figure 10.Can find out, for a plurality of additional diversity channels still Existential Space.Then, can only identify this diversity channel by the position of diversity channel in bitmap or regional ID.For example, diversity channel 210 will only be identified by the position 4 in the bitmap or regional ID " 0100 ".Similarly, diversity channel 211 will be identified by the position 6 in the bitmap or regional ID " 0110 ", and the below is an example with the diversity channel assignment signalling of this meaning that can adopt:
Situation for bitmap
Bitmap
To each position 1
{ user ID }
Situation for regional ID
Number of users
For number of users
{ user ID
Zone ID}
Can as followsly notify two diversity channels shown in Fig. 2 with signaling:
User ID=4, regional ID=0100
User ID=5, regional ID=0110
In another example, diversity channel is take sub-slots as the basis definition.An example like this is shown in Figure 13.This example comprises the sub-slots identical with Figure 12, sub band structure, and comprises same 3 subband users 202,204,206.In addition, define and the recognin channel with identical diversity tree 208.In the case, 3 different diversity channels have been illustrated.The subcarrier that is used for the first diversity channel illustrates 220, and the subcarrier that is used for the second diversity channel illustrates 222, and illustrates 224 for the subcarrier of the 3rd diversity channel.In the case, can find out, the content of the first diversity channel 220 crossed over sub-slots 182,184 the two; The content of the second diversity channel 222 only is positioned at the first sub-slots 182, and the content of the 3rd diversity channel 224 only is positioned at the second sub-slots 184.Therefore, given diversity channel can be assigned to one or the other in 2 sub-slots, perhaps, distributes to simultaneously this 2 sub-slots.How the below realizes that the diversity channel assignment signalling is with an example of the sub-slots content of notifying this realization:
Situation for bitmap
To each sub-slots
{ bitmap
For each position 1
{ user ID }
Situation for regional ID
To each sub-slots
{ number of users
For number of users
{ user ID
Zone ID }
For the specific diversity channel shown in Figure 13, can identify diversity channel fully with following signaling:
For the diversity user
For sub-slots 0
User ID=4, regional ID=0100
User ID=5, regional ID=0110
For sub-slots 1
User ID=4, regional ID=0100
User ID=6, regional ID=1001
Note, in the example of Figure 12 and 13, adopt each to comprise two sub-slots and subcarrier frequency hoppings that the OFDM symbol is right for every sub-channels.For example, can find out that the subchannel (subchannel that diversity channel 222 uses) of being identified by regional ID 0100 is offset two subcarriers the 2nd OFDM symbol centering of sub-slots 182.Obviously, the subcarrier frequency hopping can be applied to maybe can shall not be applied in the given realization.In addition, how the example of Figure 12 and 13 being expanded to any time slot definition, the definition of norator time slot, the subcarrier of any amount and the subband of any amount is obviously equally.
Above-mentioned example is the example of subband formula channelizing.In another is realized, utilize diversity channel, this namely so-called remaining space formula channelizing by considering that all remaining subcarriers create the diversity channel tree after sub-band channel is distributed.
In first example, this diversity channelization can be carried out as the basis take sub-slots, and the distribution of travelling carriage is also carried out as the basis take sub-slots.Provide a such example referring now to Figure 14, define wherein that a kind of each subband comprises 6 subcarriers by 2 sub-slots 230,232 and 8 structure of time slot that subband 234～248 forms, and 3 subband users indicate at 250,252,254 places.During the first sub-slots 230, the available subcarrier of the diversity channel that is useful on is all in the combination of 356 places, and then, these subcarriers just can be used for creating all as the aforementioned sub-channelizing trees.Then, can utilize as the bitmap in the previous example and regional ID definition diversity channel.Shown in example in, during the first sub-slots, exist 36 to can be used for the subcarriers that the diversity channel tree creates, and during the second sub-slots 232, the subcarrier that can be used for diversity channel indicate, can find out 30 such subcarriers of existence at 258 places.
In another was realized, the remaining subcarrier of all in each sub-slots made up as the situation of the example among Figure 14, then made up these two groups of subcarriers and tabulated to create single sub-carrier, and utilize the tabulation of making up to carry out the diversity sub-channelizing.With reference to Figure 15, Figure 15 shows such example, wherein is combined to create single tabulation 258 from the subcarrier 256 of the first sub-slots 230 with from the subcarrier 258 of the second sub-slots 232, and then tabulation 258 is used to create diversity sub-channelizing tree structure.In the case, will carry out as the basis take each time slot the distribution of travelling carriage.In another example of diversity channel definition, be positioned at a time slot and at first listed at all residue subcarriers of given subband.Then these tabulations based on subband are combined into for one of whole time slot total tabulation, and utilize the list creating diversity sub-channelizing tree of this combination.Then, take each time slot as the distribution of basis execution to travelling carriage.Provided a such example among Figure 16, wherein identical sub-slots and sub band structure and subband user assignment illustrate as the situation of the example among Figure 15 equally.Available subcarrier in the second sub-slots 232 is organized by the subband of 260 places indication.Then these subbands make up to generate with the subband of the first sub-slots 230 of tissue similarly and are used to thereafter the Assembly Listing 262 that diversity sub-channelizing tree generates.
The time slot diversity channel tree that the above introduces has defined as follows so that any one sub-band channel distribution can not affect time slot diversity channel tree structure and can be used for assigned resources.The below has provided other example of time slot diversity channel tree.Purpose for the following embodiments of the invention that provide, this time slot diversity channel tree is used the diversity subchannel of L the subcarrier that comprises quantification, and each time slot comprises M the OFDM symbol (perhaps M group is determined size, and is for example paired, OFDM symbol) of quantification.This structure of time slot can provide by the following method:
For given OFDM symbol, available subcarrier is divided into the L group.According to the subcarrier N that can be used for the diversity subchannel TotSum, subchannel N ChQuantity will be N Ch=N Tot/ (L), because every sub-channels has L subcarrier.For each OFDM symbol (or glossary of symbols) (m=1,2 ..., M), get a subcarrier by each group from L group and define N ChSub-channels.In a particular instance shown in Figure 17, M=10, L=24.Thus, a sub-channels is to create by getting a subcarrier each group in OFDM symbol (or glossary of symbols) m.A diversity channel comprises 24 subcarriers.The quantity N of subcarrier depends on available bandwidth.For these specific quantities N=3,6,12,25,39,53, bandwidth is respectively 1.25MHz, 2.5MHz, 5MHz, 10MHz, 15MHz and 20MHz.Shown in example in, the position that is included in the subcarrier in each group in the given subchannel is identical.Therefore, for first subchannel 272 of anticipating shown in Figure 17, it comprises the first subcarrier of 24 each groups in the group.
Carry out sub-channelizing to define one group of basis subchannel so that the basic subchannel of this group is included in the subset of the corresponding subchannel that defines on each of a plurality of OFDM symbols (or OFDM glossary of symbols).Equal a plurality of groups of quantity of the subchannel that will define by available subcarrier being divided into quantity, and randomly from each group, get a subcarrier in same position and can as the example of Figure 17, define subchannel.Yet, can use other to define the method for subchannel.The subchannel (on a plurality of OFDM symbols or OFDM glossary of symbols) of definition for example utilizes the sub-channelizing tree so can be combined into as the diversity channel in the previous examples thus.
Figure 18 shows and uses the example of organizing the diversity sub-channelizing of basic subchannel such as this that defines among Figure 17.With reference to the general hybrid diversity tree method of describing of figure 9B, still also can use the more general any method that subchannel combinations is become diversity channel before using.Shown in example in, paired " adjacent " subchannel in Figure 18 in the first combination layer combination (being called layer 5～80).Note, according to the definition of this base set of subcarrier, the adjacent sub-carrier in this subband that may or may not can cause in the first combination layer, defining.The input of sub-channelizing is similar to reference to as described in Figure 17.Particularly, take out the available subcarrier of the diversity sub-channelizing that is useful on all symbols in this time slot (or each group code), and according to creating the individual channel tree structure in these subcarriers.In the example of illustrating, to forming, and for first, second and the tenth symbol pair, there is to come respectively one group of right available subcarrier of each symbol of comfortable 288,290,292 places indication in single time slot by 10 symbols.Basic diversity subchannel is indicated at 294 places and is comprised from a right subcarrier of each symbol.Yet, make up so that there is the mode combining diversity subchannel of paired continuous subcarrier at the lower one deck at 286 places.All the other diversity trees are to utilize other layer in the indication of 294,296,298,300 places to make up as previously mentioned.
With reference now to Figure 19～23,, and will provide one group of example that sub-band channel defines.Recall utilize sub-band channel be given subband user assignment in given time slot in frequency and one of adjacency group of resource all on the time.Suppose that Resource Block has N subcarrier on the individual OFDM symbol of M (M 〉=1), by giving their assignment K * N subcarriers (in other words at M OFDM mark space of J group, K Resource Block, K 〉=1) these resources are distributed to the subband user, in this J 〉=1.The least unit of subband assignment is the single resource piece.Figure 19 shows time domain and moves from left to right along axle 302, and the structure of time slot that frequency domain from top to bottom moves along frequency domain axle 304.This structure of time slot comprises that 5 OFDM symbols are to (that is, M=2) and 8 subbands.For each group code there is the corresponding Resource Block 306 of indicating in each upper possible subband in the T/F plane.For example, Resource Block 308 is comprised of same first subband of the subcarrier on first pair of OFDM symbol.How for the subband of any amount in total frequency band and how to be that (or set of M 〉=1 an OFDM symbol) prepared this decomposition is obvious for the OFDM symbol of any amount in the time slot.The time domain tree structure of usually indicating at 310 places takes into account and effectively defines any one group of continuous OFDM symbol to (or set of M 〉=1 an OFDM symbol).Ground floor on this tree has and is equal to the right resolution of each OFDM symbol.In the example of illustrating, 5 nodes will be arranged, although this is not to separate with the node of Resource Block to illustrate in this tree.Lower one deck in this tree comprises node 312,314,316,318, a pair of continuous OFDM symbol of the unique identification of each node pair.For example, node 312 will be identified the first and second OFDM symbols pair, and the 3rd layer in this tree has node 320,322,324.3 continuous OFDM symbols of the unique identification of each such node pair.For example, node 320 will be identified 3 continuous combinations that the OFDM symbol is right.In the 4th layer, node 326 and 328 is all identified 4 continuous OFDM symbols pair.For example, node 326 and 4 OFDM symbols are to being associated.At last, at the layer 5 of this tree, have individual node 330, its will with all 5 OFDM symbols of this time slot to being associated.Therefore, by each node in this tree of unique identification (having 5+4+3+2+1=15 node), can any continuous right set of OFDM symbol of unique identification.As the situation in the definition of aforesaid diversity, time domain tree 310 can have relevant bitmap or realm identifier to quote the interior specific node of this tree.
Similar table structure of definition is to realize in abutting connection with unique the quoting of any one permission combination of subband in frequency domain.In some implementations, maximum two adjacent sub-bands can be combined into a sub-band channel.In other is realized, allow any a plurality of combination.In the example of illustrating, a complete tree (not shown) will have 8 nodes at ground floor, at the second layer 7 nodes etc. be arranged, altogether 36 nodes.For example utilize bitmap or regional ID can again identify these nodes.
In a particular instance, can utilize 4 arbitrary nodes of identifying in the time domain tree 310, and can utilize 6 arbitrary nodes of identifying in the frequency domain.
Defined time domain tree 310 and frequency domain and set, can be by making up to define arbitrarily sub-band channel with the node of identifying according to the frequency domain tree according to the node of time domain tree identification.Be the example purpose, illustrated the part of frequency domain tree.For example, specific sub-band channel of 150 places in Figure 19 indication, it comprises the subband of 3 adjacency in to the duration at two continuous OFDM symbols.This seed belt can be by coming unique identification for the time domain tree node identifier of node 314 with for the combination of the frequency domain tree node identifier of node 360.This embodiment allows the optional position of sub band resources in whole resource space to be assigned.
In another embodiment, all sub-band channel resources all are to (generally speaking, the first symbol of M symbol or first group) beginning assignment from this first symbol.This allows to realize that a simpler time domain is set and its expense is less.Yet, still have the shortcoming of underaction.Figure 20 shows a such example, wherein usually only comprises the node of the combination that continuous OFDM symbol that representative begins from the time slot starting point is right in the time domain tree of 370 places indication.2 OFDM symbols of node 372 representative pair, 3 OFDM symbols of next node 374 representatives pair, 4 OFDM symbols of next node 376 representatives pair, and top node 378 represents all 5 OFDM symbols pair.This tree does not allow reference example such as the third and fourth continuous OFDM symbol pair.Yet, can find out that owing in this tree 5 nodes (supposing to have comprised first node 371) are only arranged, it can only utilize 3 and represent.This frequency domain tree structure can be identical with the described structure of reference Figure 19.
Notice that given realization may limit the quantity of the continuous subband that can be combined into sub-band channel, for example, may be to only have maximum 2 subbands to be combined into a given sub-band channel.In the case, the frequency domain tree will only have 2 layers, each subband of the unique identification of ground floor, and the unique identification of the second layer is any a pair of in abutting connection with subband.In the case, for the example that has 8 son band bases among Figure 19, altogether 15 nodes in the frequency domain will have 7 nodes in lower one deck of this tree, and can utilize 4 to come these nodes of unique identification.
With reference to Figure 21, Figure 21 shows for so a kind of realization, i.e. how the realization of Figure 19 carries out sub-band channel identification, but only has maximum two sons to be with basic access unit to be combined in sub-band channel.This can be seen that, in time domain tree 310, still have 15 nodes, and these nodes can by the position in the bitmap (be called 1,2 ... 15) identification, 4 node ID shown in perhaps utilizing are identified.Similarly, in the common frequency domain tree in the indication of 380 places, this tree only comprises above-mentioned two-layer and have altogether 15 nodes, each node can or pass through in the bitmap the position (1,2 ... 15), perhaps 4 node identifiers are identified.Therefore, always have in the sub-band channel that 8 examples that are used for identification Figure 21 allow any one.In addition, the node name agreement of using in frequency domain or time domain need not be identical.For example, can use the bitmap scheme in time domain and use node ID in frequency domain, vice versa.It will also be appreciated that and to use any one suitable node naming convention.A specific subchannel illustrates at 382 places, and it is comprised of two upper continuous subbands two OFDM symbols.For by 10,001,011 8 bit identifiers that form, this node identifier may be the combination of time domain node identifier (1000) and frequency domain node identifier (1011).
In another embodiment of the present invention, be not each node of mark in time domain and frequency domain respectively, but the frequency domain node and the time domain node each arrange the uniquely tagged zone ID that has respectively separately.For the example of Figure 21, for altogether 225 nodes that provide separately unique identifier, domain node and 15 frequency domain nodes when having 15.Therefore, still can be with 8 each that come in these 255 nodes of unique identification.Figure 22 shows a such example, and it is identical with tree structure among Figure 21, but each node is uniquely tagged.In Figure 22, only have which node relevant with the first subband to be labeled, because the time domain tree is extended from these nodes.Yet, will be presented the situation of uniquely tagged for each node, be the corresponding time domain tree that each subband makes up all as shown meanings.Owing to there are 255 nodes, 8 bit identifiers shown in can using come these nodes of unique identification.
In another example of the definition of the channel of sub-band channel and name, adopt a kind of two step schemes.In a first step, identify the Resource Block that can be used for the sub-band channel definition with bitmap.For example, 4 OFDM symbols in the structure of time slot that formed by 8 subbands, total resources will be comprised of 32 Resource Block, therefore can come to identify it for each Resource Block with 32 two-dimensional bitmap and whether can be used for sub-band channel and use.The 400 places indication in Figure 23 A of resource space for 4 * 8, an example of this two-dimensional bitmap.Below be an example for the two-dimensional bitmap 400 of the particular instance of Figure 23 A:
[1?0?0?0?0?0?1?1
1?0?0?0?1?0?1?1
1?0?1?0?0?0?0?0
0?0?1?0?0?1?1?0]
Figure 23 B shows another example of the subband assignment of using this scheme.In the case, indicate at 408 places in this two-dimensional bitmap.
Next step is to name with the systematic naming method method to utilize each sub-band channel of using the combination of Resource Block identifying or Resource Block to create for sub-band channel by bitmap.Use the purpose of " systematic naming method method " can as one man be applied to network for location to provide identical result nothing but the method.In the specific example that Figure 23 A illustrates, carry out a kind of two step schemes for unified name.At first, in frequency domain, utilize each subband that has provided title to carry out name, and have one group in the situation of subband, utilize these continuous subbands to make up the frequency domain tree.In the example of illustrating, the first name step indicate at 402 places, can find out, an OFDM symbol to during, in bitmap, have identified 3 subbands and can be used for the sub-band channel use, and they are identified as respectively 1,2,3.In addition, owing to the subband that is labeled as 2 and 3 is adjacency, a tree is set up thus, and this will cause being labeled as another node of 4.During next OFDM symbol, have 4 subbands to can be used for sub-band channel and use, and they are marked as 5,6,7 and 8, and the combination that is labeled as 7 and 8 subband has been marked as 9.During the 3rd OFDM symbol, only have 2 subbands to use owing to sub-band channel, and they are labeled as 10 and 11.The 4th OFDM symbol to during, have 3 subbands to can be used for sub-band channel and use, and they are marked as 12,13 and 14 be adjacency owing to be labeled as 13 and 14 subband, exist to be labeled as another node of 15.Next, as in the indication of 404 places, set up tree structure in the suitable place in time domain.This also systematically finishes.In the example of illustrating, this begins to carry out from the top at frequency domain.Therefore, because node 1,5 and 10 is continuous for given subband in time, the arbitrary arrangement 1 of these Resource Block, 2 or 3 is effective sub-band channel definition.Therefore, node 16 and 17 is used to be identified as right continuous symbol pair, and node 18 is used to identify wherein all combinations of 3.In addition, node 19 is added into the combination that is used to indicate node 12 and 13; Node 20 is added into the combination that is used to indicate node 2 and 7; And node 21 is added into the combination that is used to indicate node 3 and 8; At last, node 22 is added into the combination that is used to indicate node 4 and 6.Node 22 will be referred to comprise the module of node 2,3, four resources of 7 and 8.
After having finished such naming convention, always have 22 nodes and can or can come any these arrangements of distributes resource blocks in order to use with given sub-band channel with 5 node ID with 22 bitmap.Node ID and bitmap can be used for notifying uniquely the sub-band channel structure together with original two dimensional bitmap 400.
For the example of Figure 23 B, do not exist in abutting connection with subband, therefore in frequency domain, there is not tree structure.
The below is an example that can be used for carrying out in conjunction with bitmap the signaling of channel allocation.
Quantity allotted=00010
U1 (user identifier of first user), node ID=01110, physical parameter
U2 (the second user's user identifier), node ID=10110, physical parameter
With reference to figure 23A and 23B a kind of specific naming convention has been described.Generally speaking, in that at first notified will be for the Resource Block (for example, utilizing bitmap) of sub-band channel afterwards, can arrange to identify each arrangement in abutting connection with subband on the continuous sub-slots with any systematic naming method.
In the method for assigned resources to sub-band channel and diversity channel of describing, suppose the sub-band channel resource by at first assignment in the above, then remainingly be used to assignment to diversity channel.In another embodiment, can not produce the system schema of this difference to sub-band channel and diversity channel definition use.On the contrary, whole frequency band can be used for sub-band channel use and diversity channel use simultaneously.Yet, when having conflict, give a channel type or another channel type priority.In one embodiment, when given subcarrier be assigned for sub-band channel or diversity channel the two the time, the content of diversity channel is breakdown or omit, and subcarrier is used to the sub-band channel content.Which subcarrier that the recipient of this diversity channel can utilize signaling information to understand their diversity channel is punctured by sub-band channel, will know that thus which subcarrier is left in the basket.
In first embodiment, according to any one example that provides above with the sub-band channel definition scheme to allow to utilize one or more OFDM symbols or symbol that the subcarrier group of upper adjacency is defined sub-band channel.After this, the diversity subchannel utilizes all subcarriers in this frequency band.So specific diversity user is assigned with one or more these diversity subchannels.In the overlapping situation of diversity channel and the sub-band channel of distributing, the diversity channel content is left in the basket to support the sub-band channel content.
With reference now to Figure 24, describing a particular instance, wherein is that an exemplary time slot preparing in 4 * 4 Resource Block spaces shows a son and is with basic access unit structure of time slot at 410 places, and each Resource Block multiply by 2 OFDM symbols by 8 subcarriers and forms.Therefore, each node in the tree 410 represents 8 subcarriers on two OFDM symbols.Tree structure shown in this allows any a pair of continuous basic access unit to be combined in the sub-band channel.In certain embodiments, a plurality of combinations of 8 subcarriers of position adjacency also can be combined to generate this sub-band channel, as the situation in the previous examples.Therefore, can be used to define sub-band channel from any piece of tree 410 node, as long as they are being rectangle in shape.Show in general manner the complete or collected works for 32 subcarriers of the right subcarrier of last the OFDM symbol of tree in 410 at 412 places.These 32 subcarriers are used to define the basic access unit of diversity channel definition, i.e. diversity channel.In the example of illustrating, these 32 subcarriers by take 4 as one group of arrangement, and per the 4th subcarrier is assigned to same diversity subchannel.The diversity sub-channelizing is generally indicated at 414 places by tree.Lowermost layer diversity subchannel is indicated at 417 places.For wherein one group in 4 one group subcarrier of 412 places indication, one of them of these subchannels 415 is illustrated to comprise the first subcarrier.Similarly, for 16 diversity subchannels altogether, be respectively first, second, and third OFDM symbol to defining 4 diversity subchannels.Can find out that each diversity subchannel comprises 8 subcarriers, this with this example in sub-band channel in identical.So diversity sub-channelizing tree 414 just can be used for defining the diversity channel as the combination of diversity subchannel.For example, the node 419 in this tree will be comprised of a combination of 4 diversity subchannels, all these the first symbol to during realize.
With reference now to Figure 25,, Figure 25 shows an example of the subchannel that how can identify the associating definition.In the particular instance of illustrating, each node that basic access unit time slot tree 410 neutralizations that are used for sub-band channel are used for the basic access unit time slot tree 414 of diversity sub-channelizing can use to indicate this user identifier will use this channel with user identifier explicitly, and this channel is sub-band channel or diversity channel.In another possible realization, transmit the bitmap that comprises corresponding position for every sub-channels, wherein each is " 1 " with occupied position.Outside this, can transmit the user identifier relevant with each " 1 " and will take this channel to identify which user.In particular instance illustrated in Figure 25, in subband tree, 40 nodes are arranged and 31 nodes are arranged in diversity tree 414 and thereby can to use 71 bitmaps to identify which subchannel occupied.
With reference now to Figure 26,, Figure 16 shows the particular instance that sub-channelizing uses, and has 7 sub-band channel 416 occupied at this in subband tree 410, and has 7 diversity channels 418 occupied in diversity tree 414.
For the example of Figure 24 to 26, suppose that each single node can be used for defining sub-band channel or diversity channel in subband tree or the diversity tree.In some implementations, some node that only activates in this tree is favourable.For example, will need the situation of the combination of at least two basic access unit for wherein minimum subband, comprise that the coxopodite point in the subband basic access unit is useful because these nodes never at them from using with it.Can more effectively identify specific channel architecture by the nodes that reduces in the tree.For example, if use bitmap, then can transmit less bitmap and identify the interior efficient channel of this " effectively " channel set and where be positioned at.Generally speaking, the method is which that will notify this tree partly is effectively, then to this effective node XM name, and utilizes the node of thus name to carry out channel allocation.This partial tree activate scheme can with the use that combines of sub-band channel tree and/or diversity sub-channelizing tree or the two.
In the first example, for the activating part tree, by notifying the interior effective top layer of this tree and notifying all layers that effective bottom will be set in this tree to come along activation or activation.Such example is shown in Figure 27, usually indicates at 420 places.5 layers of tree 422 have been shown among Figure 27, have wished in these 5 layers of trees, only to activate third and fourth layer node.In other words, the channel that comprises individual layer 5 sub-channels is under an embargo, and is under an embargo corresponding to the channel of the second layer (8 sub-channels) or ground floor (all subchannels).This can realize for bottom for the 4th layer of top layer by notifying the 3rd layer, this will indicate this effectively tree be usually in the tree of 424 places indication.Can utilize aforesaid any one example to carry out node at this point and name this effectively each node in the tree.In the particular instance of illustrating, effectively in the tree 12 nodes are only being arranged, therefore 12 bitmap can be used or 4 regional ID can be used to identify each node.
In another example, this scheme is defined top layer and bottom by further refining with a plurality of sections of allowing in this tree, and each tree is by a corresponding top node definition.An example like this is also shown in Figure 27, usually indicates at 430 places.At this, show identical 5 layers of tree 422, and have two sections, first paragraph 432 has top node 431, and the top layer in this tree that will be activated under this top node is the 3rd layer, is the 4th layer with the bottom that is activated.Similarly, for the second segment 434 with top node 435, the top layer that activate is the second layer, is the 3rd layer and want the bottom of bottom.Resultant effective tree is indicated at 436 places.Any suitable nomenclature scheme can be used for the thus node of identification of name again.In the particular instance of illustrating, always have 9 nodes, therefore can use 9 bitmaps or 4 realm identifiers.The below is an example that can be used to indicate the signaling mechanism of effective tree structure.
The hop count amount
For certain
The Tcp node
The top layer of tree
The bottom of tree
For the example 1 among Figure 27:
Hop count amount=1
Top layer=3, bottom=4
For the example 2 among Figure 27:
Hop count amount=2:
For section 1 (top node ID=00001, top layer=3, bottom=4)
For section 2 (top node ID=00010, top layer=2, bottom=3)
According to one embodiment of present invention, Figure 28 has proposed to use another part tree activation mechanism of binding tree method.Utilizing this method, is not the bottom to top node, top layer and the tree of the tree of each section notice in a plurality of sections, but to each section notice top node and the bottom of notifying each top node.Therefore, all nodes that quilt under each top node recognizes relevant top layer have downwards effectively been comprised in the tree at this.In the example of Figure 28,5 layers of tree are indicated at 440 places, and will have 2 top nodes 441 to be comprised in this effectively in the tree, and the 4th layer of top layer position.Therefore, the effective tree that produces is the tree of the general indication at 442 places.Utilize effective tree of so setting up, can utilize any one group of suitable method, for example previously described a certain method is carried out the node name.
According to one embodiment of present invention, Figure 29 has proposed to use the another kind of partial tree activation mechanism of node Activiation method.Utilize the method, at first, effective all nodes in the overall tree of identification.This can realize by for example utilizing bitmap.In case the node of lesser amt is identified thus, name remaining effective node with regard to utilizing suitable naming method.Figure 29 shows a such example, wherein shows 5 layers of tree that comprise 31 nodes at 444 places.One subset of these nodes is selected as effectively, and these nodes are included among Figure 29 with 7 nodes shown in the black matrix.Can transmit 31 bitmaps is effective to indicate 7 nodes.Then, as in effective time slot tree of 446 places indications like that, can name each effective node.In the example of illustrating, owing to there are 7 effective nodes, can with 3 next each nodes of unique identification, perhaps can indicate which node in this effective time slot tree to be used with 7 bitmaps.In the case, can find out, exist a unbalanced resource to distribute, because the node in this effective time slot tree has the resource of the varying number of distributing to them.
Can be lentamente or dynamically upgrade and form this effectively node of tree, in certain embodiments, can upgrade whole tree.In other embodiments, in this tree only which part of having changed be updated in order to reduce expense.Figure 30 has illustrated two specific examples.In first example, define the part (or section) that needs in this tree to revise with top node.Preferably, this top node is considered to use whole tree, namely before with tree-pruning being effective tree.In the example 1 of Figure 30, effectively set 450 and need to be corrected in order to become effective tree 452.Therefore, to the whole tree identifier of node 451 identifications, then provide the new lastest imformation for this node.In this example, its bottom by this node forms, and definition refers again to whole tree for layer.Only notify this individual node 451 and lastest imformation thereof than again notifying whole effective tree more effective.
In the example 2 of Figure 30, notify again top node, the node of then which indicating face toward with bitmap will be effective afterwards in correction.Therefore, after having identified node 455, refer again to this whole tree, can indicate which node with bitmap will be effectively in the effective tree 456 after renewal.In the example of illustrating, it is comprised of 3 nodes 457.
With reference now to Figure 31,, Figure 31 will provide two particular instances of assignment signalling.For bit map method, transmit a bitmap with indicate this effectively which node in the tree be assigned with, and notify corresponding user ID for each node.The below is an example for this bitmap of the effective tree 460 among Figure 31 and user ID signaling:
Bitmap:
100011111000
User ID: U1, U2, U3, U4, U5, U6
In another example, not to use bitmap, but each node ID is distributed to each user ID.An example has been shown among Figure 31, and wherein the quantity assignment of node ID is 2.An example of operable signaling is as follows:
Quantity allotted=0010 (2)
User ID U1 distributes to node ID=0000,
User ID U2 distributes to node ID=0100
As in all other examples described here, if do not know recipient's priority, also can transmit explicitly physical layer parameter with assignment signalling.
With reference to Figure 32,3 other signaling examples have been described by way of example.In first example, usually to indicate at 464 places, which effective node 7 bitmaps can be used for indicating be assigned with, then for the user ID of each transmission in this bitmap.For the example of illustrating, can use following signaling:
Bitmap 1110110
User ID: U1, U2, U3, U4, U5
For second example of the general indication at 466 places, can use node to distribute.Can following use signaling:
Quantity allotted=010 (2)
User ID U1 distributes to node 000;
User ID U2 distributes to node 001.
In Figure 32, show the 3rd example in 468 place's generality.In this example, use all 7 effective nodes, therefore must transmit a bitmap to indicate which effective node to be assigned with.On the contrary, only need to be to each effective node notice user identifier.
Static partition
Based on subband and diversity user's difference and their business load, this subregion can keep a period of time and can upgrade by signaling at a slow speed.Any above-mentioned method all can be used for static partition.
Dynamic partition
In certain embodiments, for each time slot, dynamically generate subregion between subband and the diversity channel based on dispatching algorithm.Subregion can dynamically be broadcasted by two-dimensional bitmap.Any above-mentioned method may be used to dynamic partition.
Having described wherein at first assignment sub-band channel then utilizes remaining Resource Block to generate the example of diversity channel.In some embodiment that implement this assignment order, define a threshold value, be used for the amount that restriction can be distributed to total transfer resource of subband user.Its reason is, if the subband CU too much frequency spectrum, be used for definition and have diversity channel for other frequency diversity of acceptor level of given application definition but then may not can be left enough frequency spectrums.In some implementations, in case reach this threshold value, just do not allow to dispatch other sub-band channel.In other is realized, in case reach this threshold value, just do not allow to dispatch diversity channel, and so that remaining bandwidth can be used for the sub-band channel use.
The example that the complete or collected works that wherein utilize the OFDM subcarrier define diversity channel and wherein take the sub-band channel assignment from the subcarrier of given diversity subchannel away has been described.Threshold value setting is to guarantee having enough resources to be used for the transmission of diversity channel like can application class.In certain embodiments, defined threshold value about the quantity of sub-band channel bandwidth occupancy.
The closed portion resource
A kind of mechanism of closing of the part resource for supporting bandwidth is provided according to one embodiment of present invention.The part resource (POPR) of closing bandwidth can be used in some situation, in order to cover by allowing dynamically to close the subcarrier control presence of intercell interference on the local time slot and strengthening the residential quarter.The position of POPR and size can be that residential quarter (base station) is specific in this time slot, and can dynamically close and open.
Can realize allowing dynamically to enable with various examples the signaling of POPR control.For the situation that the POPR bandwidth is slowly upgraded, can identify with bitmap will pent resource.For example, one dimension (each corresponding subband, wherein first is used for the first subband) or two-dimensional bitmap (each corresponding Resource Block).
With reference now to Figure 33,, an one dimension bitmap can be used for notice by the POPR situation of 500 general indications, can find out that wherein subband 0 and subband 6 will be by Temporarily Closeds.The one dimension bitmap can be used to indicate and close these subbands.The below is an example of this bitmap:
Example 1-one dimension bitmap (frequency domain)
[0 111110 1], first corresponding to the first subband
In second example, use a two-dimensional bitmap.This is so that can close subband during the specified time interval in a structure of time slot.An example like this is usually in the indication of 502 places of Figure 33, and one of them independently is used to each Resource Block in the position.In the case, can use 32 bitmaps.As selection, can at first use the additional information of one dimension bitmap to indicate affected subband how to be affected together with these subbands of indication for frequency domain.The below is the example for a frequency domain bitmap of the example 502 of Figure 33:
Frequency domain
[1 011111 0]-＞ subband 1 and 7 is influenced
Utilizing the one dimension frequency domain bitmap to identify after subband 1 and 7 is affected, it can be the one dimension bitmap that each affected frequency domain subband generates time domain.The below is its example, and it indicates the OFDM symbol in the second subband that (generally speaking, OFDM symbol or one group of M 〉=1 symbol) 2 is closed, and the OFDM symbol 3 in the 7th subband is closed:
Time domain
For subband 1:[1 10 1]-＞the OFDM symbol is closed 2
For subband 7:[1 11 0]-＞the OFDM symbol is closed 3
When arriving the time of definition diversity channel, for example, utilize previous described diversity subchannelization technique, be necessary that transmitter and receiver all understands the subcarrier that is taken by POPR and be not useable for diversity channel and make up.In the case, the diversity channel of size reduction can be used for transmitting the data that quantity reduces; As selection, can transmit the data of equal number, expectation can be in receiver the redundancy in the equilibrium criterion with the carrier wave of compensating missing.
In the other method that the POPR position is provided, this can distribute to the sky user by the sub band resources that will close simply and realize, for example in this mode, and MAC ID=0, these channels will can not be used.So just provide a kind of of resource to closing very simply to dynamically update.
Scheduling
According to various embodiments of the present invention, the below has proposed to support the scheduling scheme of subband and/or diversity user's OFDM air interface.
When the schedule forward link resource, there is in 3 situation to consider;
All users are the subband users;
All users are the diversity users;
Be mixed with subband user and diversity user.
In certain embodiments, given travelling carriage can want to report that subband CIR or Whole frequency band CIR indicate its preference sub-band channel or diversity channel distributes by indicating it.In some implementations, each travelling carriage want what system just to it what.Yet in other was realized, although travelling carriage has indicated it whether to want to report subband CIR Whole frequency band CIR, scheduler program had determined that in fact which user of indication preference subband report has reported subband CIR.For example, scheduler program can be indicated travelling carriage it would rather be based on reporting one or more subband CIR and be unwilling to report Whole frequency band CIR that such as type of service, buffer sizes, geometry or diversity user vice versa with the factor of subband user's ratio.Generally speaking, dispatching each user is that sub-band channel or diversity channel can be carried out according to the information that the user receives.
Front two kinds of situations (that is, all users are that subband user or all users are the diversity user) are easy to process, because the user that next user that will dispatch dispatches before can not disturbing.Yet the third situation namely is mixed with subband and diversity user, and is more complicated.When sub-band channel was scheduled, it can be taken subcarrier away from a plurality of diversity channels.If before the subband user, dispatched the diversity user, then in same time slot, be retained in the lazy weight of the subcarrier in the diversity channel to transmit with the data transfer rate that distributes.
Above three kinds of situations can utilize scheduling scheme described below to process.According to embodiments of the invention, the scheme that proposes is according to above-mentioned channelization scheme.Yet sensu lato concept is not limited to this, but can be applied to other channelization scheme, for example comprises, if diversity channel is taken subcarrier away the perhaps situation of the employed subcarrier mutual exclusion of sub-band channel and diversity channel from sub-band channel.
With reference to Figure 40, provide according to one embodiment of present invention following scheduling scheme:
4C-1) create two-dimentional priority matrix, wherein a N bIndividual row represent each user to the priority of single frequency band, and last row representative is to the priority of whole frequency band.If travelling carriage does not have report about the CIR of each single frequency band, then each subband priority of user is set to 0.For being the travelling carriage that some or all subbands are reported CIR, if do not report Whole frequency band CIR, then the diversity priority is set to 0.If not only reported Whole frequency band CIR but also reported subband CIR, and if subband CIR be mapped to the data transfer rate identical with Whole frequency band CIR, then the subband priority is set to 0, in the case, may be no advantage for allocated subbands.The below is example, wherein a P of this matrix I, jBe i user in the priority of j frequency band, and P iThat i user is for the priority of whole frequency band.Can use any suitable priority scheme.
P 1,1 P 1,2 · · · P 1 , N b P 1 P 2 , 1 P 2 , 2 · · · P 2 , N b P 2 · · · · · · · · · · · · · · · P n , 1 P n , 2 · · · P n , N b P n
4C-2) create an available band tabulation, it comprises the two basic subchannel and each unit size on each transmitting antenna of diversity and sub-band channel.An example of this channel list is as follows, wherein D iThe diversity channel unit, and S iSub-band channel unit (identical with the Resource Block of before definition).By provide row to use identical method to the antenna of any amount (one or more) for each antenna.
Channel Elements Available subcarrier on the antenna 1 Available subcarrier on the antenna 2
D 1 B D，1 (1) B D，1 (2)
D 2 B D，2 (1) B D，2 (2)
… … …
D d B D，d (1) B D，d (2)
S 1 B S，1 (1) B S，1 (2)
… … …
S s B S，s (1) B S，s (2)
4C-3) from two-dimentional priority matrix, select to have the user of highest priority.
Is 4C-4) user the subband user?
If the user is subband user (yes path, step 40-4), then at step 40-5, if have available sub-band channel (yes path at selected subband, step 40-8), if and the impact of the diversity channel of previous scheduling is lower than threshold value (yes path, step 40-9) (for example, the quantity of the subcarrier that can take away from diversity channel, and still allow diversity channel to be rescheduled with the data transfer rate of the equivalence that before had been assigned with), or preferably do not have an impact, then will divide at step 40-11 and match the impact of all diversity channels and be lower than the sub-band channel of threshold value.In certain embodiments, distribute the subchannel with minimum influence.If the impact on the diversity user is not less than threshold value (no path, step 40-9), if then the diversity channel of previous scheduling can't be reallocated (no path, step 40-10), then can select not dispatch this subband user.Therefore, user's priority can be set to 0 and return step 40-3 at step 40-14, otherwise continues.If affected diversity channel can be reallocated (yes path, step 40-10), then this subband user is scheduled, and the diversity user is reallocated at step 40-12.
After scheduling, the sub-band channel of distributing is removed from available channel list, and upgraded the size of (available with scheduling) diversity channel at step 40-13.
If the user is diversity user (no path, step 40-4), then distribute diversity channel to the user at step 40-6.
If have the available channel that will distribute and have more user to dispatch, then return step 40-3.
Described a kind of very concrete dispatching method with reference to Figure 40, this is a kind of very concrete combination of the adoptable feature of scheduler program.Generally speaking, the subset of these features can occur in given realization.
For example, in certain embodiments, provide a kind of dispatching method that each receiver is dispatched to sub-band channel or diversity channel according to the information that receives from receiver that relates to.Select subband or subband CQI information or to subband or the preference of diversity channel is three examples of this information.
In certain embodiments, the method is related to each receiver definition priority, and attempts each receiver of scheduling with priority order.
According to one embodiment of present invention, under the situation of MIMO transmission, for example utilize and control (PARC) or a space-time emission diversity (STTD) by day wire rate, scheduling process is identical.Yet, use PARC and some users use the mixed scenario of STTD for PARC or for some users, will safeguard available channel list and priority matrix for each transmitting antenna.Although top shown example is for the MIMO situation, these scheduling schemes of the above and following statement all can be applicable to the configuration of an antenna.
According to another embodiment of the present invention, not that the diversity user for previous scheduling redistributes resource after having dispatched the subband user, but scheduler program can calculate the required stock number of the diversity user of each scheduling, distributes the diversity channel of reality after selected and subband user is assigned with sub-band channel the user.
After having determined the impact of allocated subbands channel on diversity channel, can consider simultaneously the quantity of the subcarrier that in diversity channel, keeps and the distance between the subcarrier.Allocation of subbands should be so that the minimum number of the subcarrier that takes out from diversity channel, and the distance between the remaining subcarrier should maximize.
According to another embodiment of the present invention, provide in the following manner multi-slot/permanent resource allocative decision.In the situation with the latency sensitive services of constant grouping arrival rate, such as VoIP, the scheduler program a plurality of time slots that separate at the interval of arrival rate of can allocating in advance to equal to divide into groups.The benefit of distributing a plurality of time slots is that it has reduced signaling consumption.Because the voip user is dispatched in advance, only utilizes said method to dispatch non-voip user.
Multi-slot distributes can be from first OFDM sign-on of this time slot.Do not take a symbol fully if multi-slot distributes, the residue subcarrier in this symbol belongs to same channel format (diversity or subband) so.In a scheduling example, the quantity that is used for the Channel Elements of multi-slot transmission is notified by the base station.In other words, notice is the quantity of Channel Elements but not user, data transfer rate and channel.This just allows other user to understand has what to be allocated in advance, so that they know that current distribution begins wherefrom, and can avoid the signaling relevant with identifying user, data transfer rate and channel, because it is identical with original allocation.Impermanent channel allocation can be from first Channel Elements of residue Channel Elements.
When the user was dispatched a plurality of time slot in advance, data transfer rate and stock number can remain unchanged.In order to follow the tracks of each user's channel, can use power management to replace speed control.If given user's channels to improve then can be given the subcarrier that distributes this user with less power assignment, and give the user with poor channel conditions with more power division.In case distributed the multi-slot form, if it does not puncture any one subcarrier from the multi-slot channel that distributes, then can carry out the subsequent subband assignment.
In certain embodiments, when detecting the quiet time slot from the user in the time slot of determined number is being given in the base station, this permanent allocation is removed until detect a non-quiet time slot in the base station.
Generally speaking, in certain embodiments, scheduling be implemented in case on a plurality of time slots some resources of for good and all assignment and other resource of assignment non-permanently.In certain embodiments, the resource of permanent assignment be positioned at each time slot begin locate and transmit indication how many resources are arranged by the signaling information of permanent assignment, wherein impermanently occur in assignment after permanent assignment.
The VoIP business is to benefit from the particular instance of permanent assignment in conjunction with the type of service of synchronous HARQ.
Provide in one embodiment of the present of invention of synchronous HARQ at the permanent assignment capacity for VoIP, only have two MCS (modulation and encoding scheme) layer to be used to the VoIP business.MCS distributes when calling out beginning, and only just changes when transmitter (such as the base station) detects marked change among the average report CQI of receiver (travelling carriage).
Because MCS is constant to a plurality of transmission when the CQI of travelling carriage changes, and can improve with power management the use of resource.For this purpose, travelling carriage is reported CQI to the base station; This CQI report can occur in any form.That instantiation comprises is multistage, difference, unit lifting/lowering, two position lifting/lowerings/unchanged.
Power is based on that the CQI of travelling carriage report regulates.Do not need additional signaling from the signaling of the travelling carriage of going to the station to meet somebody.Mapping between the CQI of power adjustments amount and report is used to select this power adjustments; This mapping all is known for base station and travelling carriage.
In certain embodiments, if travelling carriage report CQI is mapped to the MCS higher than existing MCS, then power is reduced for the specified amount of difference between two MCS ranks.If travelling carriage report CQI is mapped to the MCS lower than existing MCS, then do not carry out power adjustments.
According to another embodiment of the present invention, permanent and impermanent transmission all can be used asynchronous HARQ, and wherein all retransmission packet all are assigned with a priority that is higher than retransmission packet.In the case, can dispatch re-transmission once receiving NAK.The grouping that retransmits can be assigned with the modulation identical with initial transmission and encoding scheme, yet the channel that distributes can be different.
For the context that is provided for embodiments of the invention to be used for communication system, Figure 35 shows base station controller (BSC) 610, it controls the radio communication in a plurality of residential quarters 612, these residential quarters provide service by corresponding base station 614.Usually, each base station 614 utilizes communicating by letter of OFDM promotion and travelling carriage and/or wireless terminal 616, and travelling carriage and/or wireless terminal are positioned at the residential quarter 612 relevant with corresponding base station 614.Travelling carriage 616 causes the remarkable fluctuation of channel condition with respect to the movement of base station 614.As shown in the figure, base station 614 can comprise the space diversity of a plurality of antennas to be provided for communicating by letter with travelling carriage 616.
Before the 26S Proteasome Structure and Function details of further investigation preferred embodiment, the high-level overview of travelling carriage 616 and base station 614 is provided, the present invention can realize based on these aspects.With reference to Figure 36, wherein illustrated base station 614.Base station 614 generally includes control system 620, baseband processor 622, radiating circuit 624, receiving circuit 626, a plurality of antenna 628 and network interface 630.The radiofrequency signal (illustrating among Figure 35) of beared information is provided from the one or more distance transmitters that provided by travelling carriage 616 receiving circuit 626.Low noise amplifier and filter (not shown) can be provided, they are collaborative be used for amplifying and remove from the broad-band interference of signal for the treatment of.The signal that then down-conversion and digitizer (not shown) will filter, receive down-converts to intermediate frequency or baseband frequency signal, and then this signal is digitized as one or more digital streams.
Baseband processor 622 is processed information or the data bit of reception signal to extract and to pass on after the digitlization in receiving signal.This processing typically comprises demodulation, decoding and error-correction operation.Therefore, baseband processor 622 normally realizes in one or more digital signal processors (DSP) or application-specific integrated circuit (ASIC) (ASIC), and then the information that receives crossed over wireless networks via network interface 630 and transmitted or be transferred to another travelling carriage 616 by 614 servers in base station.
In emission one side, baseband processor 622 receives digitalized data from network interface 630 under the control of control system 620, and this digitalized data can represent speech, data or control information, and these data of encoding are used for transmission.Data behind the coding are output to radiating circuit 624, are had the carrier signal modulation of the tranmitting frequency of expectation in these data.The carrier signal that the power amplifier (not shown) will amplify after the modulation is the level that is suitable for transmitting, and the carrier signal after will modulating is sent to antenna 628 by the network (not shown) that mates.The below describes modulation in detail and processes details.
With reference to Figure 37, Figure 37 has illustrated according to the travelling carriage 616 of one embodiment of the invention configuration.Similar with base station 614, travelling carriage 616 will comprise control system 632, baseband processor 634, radiating circuit 636, receiving circuit 638, one or more antenna 640 and user interface circuit 642.Receiving circuit 638 receives the radiofrequency signal of beared information from one or more base stations 614.Low noise amplifier and filter (not shown) can be provided, they are collaborative be used for amplifying and remove from the broad-band interference of signal for the treatment of.The signal that then down-conversion and digitizer (not shown) will filter, receive down-converts to intermediate frequency or baseband frequency signal, and then this signal is digitized as one or more digital streams.
Baseband processor 634 is processed information or the data bit of reception signal to extract and to pass on after the digitlization in receiving signal.This processing typically comprises demodulation, decoding and error-correction operation.Baseband processor 634 normally realizes in one or more digital signal processors (DSP) or application-specific integrated circuit (ASIC) (ASIC).
In order to transmit, baseband processor 634 receives digitized data from control system 632, and digitalized data can represent speech, data or control information, and these data of encoding are used for transmission.Data behind the coding are output to radiating circuit 636, are used for modulating the carrier signal that is in the tranmitting frequency with expectation at the modulated device of these data.The carrier signal that the power amplifier (not shown) will amplify after the modulation is the level that is suitable for transmitting, and the carrier signal after will modulating is sent to antenna 640 by the network (not shown) that mates.The obtainable various modulation of those skilled in the art and treatment technology are used to the signal transmission between travelling carriage and the base station.
In OFDM modulation, that transmission band is divided into is a plurality of, the carrier wave of quadrature.Each carrier wave is modulated according to the numerical data that will transmit.Because OFDM is divided into a plurality of carrier waves with transmission band, the Bandwidth Reduction of each carrier wave and the modulating time of each carrier wave increase.Because a plurality of carrier waves are parallel transmissions, the speed when being lower than when the single carrier wave of use for the transmission rate of numerical data or symbol on any specific carrier wave.
The characteristic of invert fast fourier transformation (IFFT) is used in the OFDM debugging for the information that will transmit.For demodulation, then use fast fourier transform (FFT) to recover the information of transmission for the signal that receives.In fact, the IFFT and the FFT that are provided by Digital Signal Processing have realized respectively inverse discrete Fourier transformer inverse-discrete (IDFT) and discrete Fourier transform (DFT) (DFT).Therefore, the feature of OFDM modulation is the carrier wave for a plurality of frequency band generating orthogonals in the transmission channel.Signal after the modulation is the digital signal that has relatively low transmission rate and can stop in their frequency bands separately.Directly do not modulate independent carrier wave according to digital signal.On the contrary, all carrier waves are processed simultaneously modulated by IFFT.
When operation, OFDM is optimized for base station 614 to down link and/or ul transmissions between the travelling carriage 616.Each base station 614 is equipped with the individual transmitting antenna 628 in " r " (〉=1), and each travelling carriage 616 is equipped with the individual reception antenna 640 in " m " (〉=1).It should be noted that and utilize suitable duplexer or the corresponding antenna of transducer can be used for receiving and transmission, and mark for clarity and like this only.
With reference to Figure 38, a logic OFDM transmission architecture will be described.At first, base station controller 610 will transmit to send each travelling carriage 616 to data to the base station 614.Base station 614 can use the channel quality indicator (CQI) relevant with this travelling carriage to come data dispatching to be used for transmission, and in order to transmit suitable coding and the modulation of data selection of dispatching.614 places determine the information that CQI may be directly provides from travelling carriage 616 or movement-based platform 616 in the base station.In any situation, the CQI of each travelling carriage 616 is that channel magnitude (or response) is crossed over the function of the degree of OFDM frequency band variation.
The data 644 of scheduling, it is bit stream, may be scrambled in the mode of utilizing the data scramble logic 646 reductions peak-average power ratio rate relevant with these data.For the data of scramble are determined a cyclic redundancy check (CRC) (CRC) and are utilized CRC to add data after logic 648 appends to scramble.Then, utilize channel encoder logic 650 to carry out chnnel coding in order to effectively add redundant to promote recovery and the error correction at travelling carriage 616 places to data.May again carry out chnnel coding based on CQI to specific travelling carriage 616.In some implementations, channel encoder logic 650 uses known spy to broadcast coding techniques.Data behind the coding are then processed to compensate and the data expansion of encoding relevant by rate-matched logic 652.
Position interleaver logic 654 systematically the position in the data behind the record coding so that the loss of continuous data position minimize.According to the baseband modulation that mapping logic 656 is selected, the result data position systematically is mapped as corresponding symbol.In certain embodiments, use quadrature amplitude modulation (QAM) or Quadrature Phase Shift Keying (QPSK).The degree of modulation can be selected based on the CQI of this specific travelling carriage.Utilize symbol interleaver logic 658, symbol can systematically be recorded the vulnerability to jamming of the periodic data that is caused by frequency selective fading being lost with the signal of further support transmission.
In this, hyte has been mapped as the symbol of the position in expression amplitude and the phase constellation.When expecting space diversity, then by space-time block code (STC) encoder logic 660 process symbol pieces, STC encoder logic 660 more can be anti-interference with a kind of so that signal of transmission and be easier to revise symbol in the mode of travelling carriage 616 decodings.STC encoder logic 660 will be processed incoming symbol and " n " output corresponding to the quantity of the transmitting antenna 628 of base station 614 will be provided.Above-mentioned control system 20 and/or baseband processor 622 about Figure 36 will provide mapping control signal to control STC coding.In this, suppose for the symbolic representation data that will transmit of " n " output and can be moved platform 616 and recover.
For given example, suppose that base station 614 has two antennas 28 (n=2) and STC encoder logic 660 that two output symbol streams are provided.Therefore, each symbol stream of being exported by STC encoder logic 660 is addressed to corresponding IFFT processor 662, illustrates separately respectively for the purpose of easy to understand.What person of skill in the art will appreciate that is, can use one or more processors and be combined to provide this Digital Signal Processing separately or with other processing described here, preferably IFFT processor 662 based on each symbol manipulation so that inverse Fourier transform to be provided.The output of IFFT processor 662 provides the symbol in the time domain.Every group of time-domain symbol (every " frame ") by 662 outputs of IFFT processor is associated with the prefix of inserting logic 664 insertions by prefix.Each consequential signal is up-converted to intermediate frequency and is converted to analog signal via corresponding Digital Up Convert (DUC) and number-Mo (D/A) change-over circuit 666 in numeric field.Result's (simulation) signal is then modulated simultaneously, is amplified and transmitted via RF circuit 668 and antenna 628 in the RF frequency of expectation.Can also transmit the known pilot signal of predetermined travelling carriage 616.These signals for example can be scattered among the subcarrier.The below will use pilot signal to be used for channel estimating the travelling carriage 616 that discusses in detail.Notice the above provides user content how can be mapped to many examples of OFDM subcarrier.In the particular instance of Figure 38, different subbands and diversity channel suitably are mapped to the input of IFFT function.A channelizer (not shown) utilizes above-mentioned arbitrary scheme that sign map is arrived the OFDM subcarrier.
With reference now to Figure 39,, illustrated among the figure to receive the signal that transmits by travelling carriage 616.The signal one that transmits arrives each antenna 640 of travelling carriage 616, and corresponding signal is just by RF circuit 670 demodulation of correspondence and amplification.For the sake of simplicity with clear for the purpose of, only describe in detail and illustrated one of them of two RX path.Mould-number (A/D) converter and lower frequency changer circuit 672 are that digital signal and down-conversion are used for digital processing with analog signal conversion.Signal after result's the digital processing can be used to control the gain of the amplifier in the RF circuit 670 based on the signal level that receives by automatic gain control circuit (AGC) 674.
At first, the signal after the digital processing is provided for synchronous logic 676, and synchronous logic 676 comprises thick synchronous logic 678, and the thick some OFDM symbols of synchronous logic 678 buffer memorys also calculate two automatic correlations between the continuous OFDM symbol.Peaked as a result time index corresponding to this correlated results has been determined a thin sync search window, and this window is used to determine accurate frame synchronization original position based on head by thin synchronous logic 680.The output of thin synchronous logic 680 has promoted the frame collection that frame alignment logic 684 is carried out.It is important that suitable frame is aimed at provides an accurate transformation from the time domain to the frequency domain so that FFT subsequently processes.Thin synchronized algorithm is based on the correlation between the pilot signal of the reception of carrying out according to the local replica of head and known pilot data.In case occuring, frame aims at collection, then use the prefix of prefix removal logic 686 removal OFDM symbols and result's sampling to be sent to frequency offset correction logic 688, the system frequency excursion that 688 compensation of frequency offset correction logic are caused by the unmatched local oscillator in the transmitter and receiver.Preferably, synchronous logic 676 comprises frequency shift (FS) and clock estimation logic 682, and frequency shift (FS) and clock estimation logic 682 offer correcting logic 688 suitably to process the OFDM symbol based on head with this impact on the signal that helps to estimate to transmit and with these estimations.
In this, the OFDM symbol in the time domain is ready to utilize FFT processing logic 690 to be transformed into frequency domain.The result is frequency domain symbol, and frequency domain symbol is transmitted to processing logic 692.Processing logic 692 utilizes scattered pilots extract out the pilot signal of scattering of logic 694 of extracting, and utilizes channel estimating logic 696 to determine channel estimating based on the pilot signal of extracting, and utilizes channel reconstruction logic 698 that the channel response of all subcarriers is provided.In order to determine the channel response of each subcarrier, pilot signal is a plurality of frequency pilot signs that run through the scattering among data symbol of OFDM subcarrier with pattern known in time and frequency basically.Continue Figure 39, processing logic with the frequency pilot sign that receives with in the subcarrier of determining at the compare channel response of the subcarrier that is transmitted with definite wherein frequency pilot sign of desired frequency pilot sign of the moment of determining.This result is interpolated to estimate that great majority (if not all) do not provide the channel response of the residue subcarrier of frequency pilot sign for it.The actual channel with interpolation is corresponding to be used to estimate whole channel response, and it comprises the channel response of great majority (if not all) subcarrier in the OFDM channel.
Be provided for STC decoder 700 according to channel response for frequency domain symbol and the channel reconstruction information that each RX path draws, STC decoder 700 provides STC to decode the symbol that recovers to transmit in the path of two receptions.When processing corresponding frequency domain symbol, channel reconstruction information provides enough equalization information to eliminate the impact of transmission channel for STC decoder 700.
Utilize symbol deinterleaver logic 702, the symbol of recovery is put back in order, and deinterleaver logic 702 is corresponding to the symbol interleaver logic 658 of transmitter.The symbol that deinterleaves then demodulated or utilization goes mapping logic 704 to remove to be mapped as corresponding bit stream.Then utilize position deinterleaver logic 706 to deinterleave these, position deinterleaver logic 706 is corresponding to the position interleaver logic 654 of transmitter architecture.Position after deinterleaving then by speed go matching logic 708 process and submit to channel decoder logic 710 with the data of recovering initial scramble and CRC effect and.Therefore, CRC logic 712 remove the CRC effects and, the data of in a usual manner verification scramble, and data are offered descrambling logic 714 be used for utilizing known base station descrambling code descrambling to recover the initial data 716 that transmit.
With recover that data 716 can be determined a CQI concurrently or 614 create the enough information of CQI and mail to base station 614 in the base station.As previously noted, CQI can be the function that carrier wave-interference ratio (CR) and channel response are crossed over the degree of each sub-carrier variations in the OFDM frequency band.For this embodiment, the channel gain that is used to each subcarrier in the OFDM frequency band of the information that transmits is compared to determine that channel gain crosses over the degree that the OFDM frequency band changes to each other mutually.Although there are many technology to can be used for measuring the degree of variation, wherein a kind of technology be used for to be calculated the standard deviation that runs through for the channel gain of each subcarrier of the OFDM frequency band that transmits data.
Figure 35～39 provide the particular instance of the communication system of the embodiment that can be used in the present invention.Will be appreciated that and to realize embodiments of the invention with the communication system with structure different from this particular instance, but to be the mode consistent with the realization of embodiment described here operate for it.
MAC (media access control) layer is used for realizing the characteristic of physics (PHY) layer in the OFDM air interface framework.Frame is a kind of for the form by the air interface transmission data between base station and the wireless terminal.Wireless terminal is the wireless device of any OFDM of possessing ability and can is fixing, that flow or movement, for example cell phone, the computer with radio modem or PDA of position.The information element of some type (IE) is comprised in the frame to provide a structure in this frame to be used for to define down link and up-link information to be positioned at which position of this frame.
With regard to the transmitter of the channelizing method of using above-mentioned instruction, this may comprise that the one or more sub-band channel distribution of transmission and/or definition, diversity channel distribute and/or definition, POPR signaling and part active information.This may comprise and receives one or more CQI, subband to preference and the preferred sub-band information of diversity channel.
In the above-described embodiment, all diversity channels are assumed to be and are distributed in the frequency domain.In another embodiment, diversity channel is defined as using one or more subcarriers, but is distributed in the time domain.Will select the OFDM symbol duration at interval to please oneself to giving the domain diversity.Can adopt similar naming method in order to defining subchannel and diversity channel with the time domain diversity.
According to above-mentioned instruction, various modifications of the present invention and modification are possible.Therefore will be appreciated that within the scope of appended claims, can be different from this mode of specific description put into practice the present invention.

Claims (72)

1. method that is used for the OFDM channelizing comprises:
Utilize a plurality of subcarriers in the OFDM frequency band to transmit the OFDM symbol;
Described OFDM symbol jointly comprises diversity channel and sub-band channel, and a plurality of subcarriers of described OFDM frequency band distribution are crossed in each diversity channel utilization, and each sub-band channel is utilized one group of subcarrier of adjacency in the described OFDM frequency band;
At least some of described OFDM symbol comprise the subcarrier that is utilized by sub-band channel and the subcarrier that is utilized by diversity channel simultaneously;
Described a plurality of subcarriers are further divided into a plurality of Resource Block, and each Resource Block comprises the contiguous subcarrier of the fixed qty at least one OFDM symbol duration;
By with described a plurality of OFDM subcarriers take the frequency partition that transmits through M 〉=1 sub-slots in time as N 〉=2 subband, definition comprises the time slot in N * M Resource Block space, each sub-slots comprises L 〉=1 an OFDM symbol; And
For diversity channel uses or sub-band channel is used that one of them integrally distributes each Resource Block.
2. method according to claim 1 also comprises:
In the mode that defines statically, each resource block assignments is used to sub-band channel or the distribution channel use.
3. method according to claim 1 also comprises:
In the mode that changes along with the time, each resource block assignments is used to sub-band channel or the distribution channel use.
4. method according to claim 1 also comprises:
Set for the OFDM symbol of each fixed size transmits at least one with reference to the OFDM symbol.
5. method according to claim 1, wherein:
Each diversity channel comprises a plurality of Resource Block with frequency interval.
6. method according to claim 1, a plurality of Resource Block with frequency interval that wherein are used for given diversity channel are transmitted simultaneously.
7. method according to claim 1, a plurality of Resource Block with frequency interval that wherein are used for given diversity channel are transmitted during different OFDM symbols.
8. method according to claim 1 wherein utilizes a plurality of subcarriers in the OFDM frequency band to transmit the OFDM symbol for each execution in a plurality of antennas, and described method also comprises:
For each antenna, transmit scattered pilots collection separately, described scattered pilots collection is transmitted so that can the phase mutual interference.
9. method according to claim 8, the described OFDM symbol that wherein jointly comprises diversity channel and sub-band channel is professional OFDM symbol, described method also comprises:
For each antenna, except described professional OFDM outer symbol, also transmit at least one with reference to the OFDM symbol; And
For the professional OFDM glossary of symbols of each fixed size, during described reference symbol, transmit described scattered pilots.
10. method according to claim 8, the described OFDM symbol that wherein jointly comprises diversity channel and sub-band channel is professional OFDM symbol, described method also comprises:
Professional OFDM glossary of symbols for each fixed size transmits at least one with reference to the OFDM symbol; And
For each antenna, during described reference symbol, transmit some corresponding scattered pilots collection, and during professional OFDM symbol, transmit some scattered pilots.
11. method according to claim 10 wherein for each antenna, is inserted the Diamond spot system of battle formations with described scattered pilots.
12. method according to claim 1 also comprises:
For each time slot, at first use distributes resource blocks for sub-band channel, then for using, diversity channel distributes remaining Resource Block.
13. method according to claim 12 also comprises:
For each time slot, utilize sub-band channel to distribute the subcarrier of rear remaining Resource Block, define a diversity subchannel, then distribute at least one diversity subchannel for each diversity channel that will during described time slot, be transmitted.
14. method according to claim 13, wherein said diversity subchannel is systematically defined, as long as so that remaining one group of Resource Block after having sub-band channel to distribute, always the result will produce same diversity subchannel.
15. method according to claim 13, wherein utilize the sub-channelizing tree with multilayer, the diversity subchannel is distributed to diversity channel, ground floor in the wherein said tree comprises a plurality of nodes, each node represents single diversity subchannel, each succeeding layer in the described tree comprises one or more nodes, and each node in the succeeding layer has merged at least two nodes of front one deck, and all subchannels of being represented by described at least two nodes of described front one deck of expression.
16. method according to claim 15, wherein each diversity channel comprises one group of one or more diversity subchannel that represented by the corresponding individual node in the described sub-channelizing tree.
17. method according to claim 16 also comprises:
By sending so that the information that each diversity channel is associated with corresponding individual node in the described sub-channelizing tree, signaling diversity channel definition, and for each diversity channel transmission user identifier.
18. method according to claim 13, wherein each diversity subchannel comprises:
To at least one subcarrier on the corresponding sub-carrier positions in each available Resource Block of diversity channel use.
19. method according to claim 18, wherein utilize the sub-channelizing tree based on the subcarrier in the channelizing of single subband remaining space formula, definition diversity subchannel, described remaining space formula channel turn to by considering that all remaining subcarriers create the diversity channel that the diversity channel tree utilizes after sub-band channel is distributed.
20. method according to claim 13, wherein utilize sub-band channel distribute after the subcarrier of remaining Resource Block define a diversity subchannel and comprise:
Carry out the channelizing of remaining space formula, described remaining space formula channel turns to by considering that all remaining subcarriers create the diversity channel that the diversity channel tree utilizes after sub-band channel is distributed.
21. method according to claim 20, wherein utilize the sub-channelizing tree of distributing all available in rear remaining Resource Block subcarriers based on sub-band channel in given time slot, definition diversity subchannel, thus and distribute diversity channel to transmit at the diversity subchannel as the basis take slotted mode.
22. method according to claim 21, wherein utilize the sub-channelizing tree of distributing all available in rear remaining Resource Block subcarriers based on sub-band channel in given time slot, define the diversity subchannel, and as the basis diversity channel is distributed to subchannel in the sub-slots mode.
23. method according to claim 13, wherein each diversity subchannel comprises the one group of OFDM subcarrier separately on a plurality of continuous OFDM symbols.
24. method according to claim 13, wherein each diversity subchannel transmits at a plurality of OFDM symbols, and be included in the one group of OFDM subcarrier separately that changes with systematized subchannel definition mode in described a plurality of OFDM symbol, described systematized subchannel definition mode is for so that given one group of available subcarrier, always can cause the system definition of the diversity subchannel of identical groups of subchannels.
25. method according to claim 1 also comprises:
Send indication and distribute which Resource Block to sub-band channel, and the signaling information that can use diversity channel of which piece.
26. method according to claim 25 wherein sends signaling information and comprises:
Send two-dimensional bitmap, described two-dimensional bitmap is to distribute the two-dimensional array of the position which Resource Block can use diversity channel to sub-band channel and which piece for the indication of NxM Resource Block space.
27. method according to claim 25 wherein sends signaling information and comprises:
Send the one dimension bitmap, described one dimension bitmap is to be included as the one-dimensional array whether each subband indication sub-band channel will be comprised in the position of the single position in the described subband;
For in the described one dimension bitmap each, send the information of identification number of users, and for each user, send the information of the initial sub-slots index of identification and sub-slots quantity.
28. method according to claim 25 also comprises:
Be the unique realm identifier of each resource block assignments, and send described realm identifier to indicate described zone just being used to sub-band channel.
29. method according to claim 25 also comprises:
For each sub-band channel and each diversity channel, send user identifier separately.
30. method according to claim 13 wherein utilizes sub-band channel to distribute the afterwards subcarrier of remaining Resource Block, defines a diversity subchannel and comprises:
For each time slot, a corresponding diversity set of sub-channels of the subcarrier that can use described time slot is used in definition;
The sub-channelizing that the permission of the described subchannel of the synthetic definition of all groups of subchannels is made up is set.
31. method according to claim 1 also comprises:
Utilize the continuous OFDM symbol in time slot of time domain tree identification;
Utilize the identification of frequency domain tree in abutting connection with subband;
Utilize the combination of time domain tree and frequency domain tree, define each sub-band channel.
32. method according to claim 31, wherein said time domain tree identifies the continuous symbol that always comprises the first symbol in the described time slot in the time slot.
33. method according to claim 31 also comprises:
Define the title of each possible sub-band channel by one of them that carry out following steps:
For each the node range of distribution Identity Code in the time domain tree be frequency domain each node range of distribution Identity Code in setting;
Be each the node range of distribution Identity Code in the time domain tree and the node that utilizes in the bitmap identification frequency domain tree;
Utilize the node in the bitmap identification time domain tree and be each the node range of distribution Identity Code in the frequency domain tree;
Utilize node and the node that utilizes in the second bitmap identification frequency domain tree in the first bitmap identification time domain tree;
Utilize bitmap to identify the combination that each possible time domain tree node adds the frequency domain tree node;
Add the combination range of distribution Identity Code of frequency domain tree node for each time domain tree node.
34. method according to claim 1 also comprises:
Identify sub-band channel by following steps:
Send the information which Resource Block of identification can be used for sub-band channel;
Utilize systematic naming method to reach an agreement on to name one or more each arrangement in abutting connection with subband on one or more continuous sub-slots;
For each sub-band channel, transmit user identifier and come self-identifying to distribute to the title of the systematic naming method agreement of the one or more particular arrangement in abutting connection with subband on described user's the one or more continuous sub-slots.
35. method according to claim 34 wherein sends the information which Resource Block of identification can be used for sub-band channel and comprises the transmission bitmap.
36. method according to claim 1 comprises:
Utilize all a plurality of OFDM subcarrier definition subband subchannels;
Utilize one group of subcarrier definition diversity subchannel of adjacency in the OFDM frequency band;
For each sub-band channel is distributed one or more subband subchannels;
For each diversity subchannel distributes one or more diversity subchannels.
37. method according to claim 36 also comprises:
Existing in the situation of conflict between the sub-band channel on the given subcarrier and the diversity channel, send the described sub-band channel on the described subcarrier.
38. method according to claim 36 also comprises:
Utilize the subband sub-channelizing tree in time and the frequency, the subband groups of subchannels is made into the permission combination of sub-band channel;
Utilize the diversity subchannel tree in time and the frequency, the diversity groups of subchannels is made into the permission combination of diversity channel.
39. method according to claim 36 also comprises:
Utilize the subband sub-channelizing tree in time or the frequency, the subband groups of subchannels is made into the permission combination of sub-band channel;
Utilize the diversity subchannel tree in time or the frequency, the diversity groups of subchannels is made into the permission combination of diversity channel.
40. according to claim 38 or 39 described methods, also comprise:
Utilize bitmap or realm identifier to be used as sub-band channel with the combination of which permission of indication subband basic access unit, and the combination of which permission of diversity subchannel is used as diversity channel.
41. described method according to claim 40 also comprises:
For each sub-band channel or diversity subchannel, send corresponding user identifier.
42. method according to claim 1 also comprises:
Activate by following steps operating part tree:
Utilize corresponding sub-channelizing tree, groups of subchannels is made at least permission channel of one of them that defines for diversity channel definition and sub-band channel;
For at least one sub-channelizing tree, activate a part of subchannel tree and send the information of identifying described part;
Described part allocated channel from described subchannel tree.
43. described method according to claim 42 wherein activates a part of sub-channelizing tree and comprises:
Activate one group of pantostrat determining in the described tree.
44. described method according to claim 42 wherein activates a part of sub-channelizing tree and comprises:
For in the top node group of corresponding at least one definition each, activate the corresponding pantostrat group in the described tree.
45. described method according to claim 44, wherein said pantostrat group is by corresponding top layer and the definition of corresponding bottom for each top node.
46. described method according to claim 44, wherein said pantostrat group is by the corresponding bottom definition of described top node and described top node.
47. described method according to claim 42 wherein activates a part of sub-channelizing tree and comprises:
Utilize the subset of the effective node in the first bitmap recognin channelizing tree.
48. described method according to claim 47 also comprises:
Which node that utilizes the second bitmap to identify in the subset of described node is assigned with, and for each node that is assigned with, distributing user identifier.
49. described method according to claim 42 also comprises:
Upgrading every now and then described partial tree activates.
50. described method is according to claim 49 wherein upgraded every now and then described partial tree and is activated and comprise:
Only the section that has changed for described tree sends lastest imformation.
51. described method according to claim 50 comprises for each section that will change:
Described section the indication that transmission will change;
Transmission is for the active information of described section renewal.
52. method according to claim 1 also comprises:
Dynamic closed portion bandwidth resources.
53. 2 described methods also comprise the pent information of which resource of identification that sends according to claim 5.
54. 3 described methods according to claim 5, wherein send which resource of identification pent information comprise one of following:
Send the pent two-dimensional bitmap of which Resource Block of indication;
Send the pent one dimension bitmap of which subband of indication;
Send which subband of indication and put pent one dimension bitmap in certain of described time slot, and send their pent additional informations when in described time slot of indication.
55. method according to claim 1 also comprises:
Dispatch each receiver to sub-band channel or diversity channel, as the function of the information that receives from receiver.
56. 5 described methods according to claim 5 also comprise:
Be each receiver definition priority;
Attempt each receiver of sequential scheduling according to priority.
57. 6 described methods according to claim 5, each receiver of sequential scheduling of wherein attempting according to priority comprises:
If described receiver is the sub-band channel receiver, then attempt to be described receiver allocated subbands channel;
If described receiver is the diversity channel receiver, then attempt to distribute diversity channel for receiver.
58. 7 described methods according to claim 5 wherein attempt to comprise for receiver allocated subbands channel:
The selection of the subband that receives that receiver selected or selected a plurality of subbands;
If described selected subband can be used, then determine to utilize the described selected described receiver of sub-band scheduling whether will affect the diversity user who has been scheduled, and if do not affect, then the receiver of described available selected subband is used in scheduling;
If described selected subband can be used, and scheduling uses the receiver of described selected subband will affect the diversity user who has been scheduled, then attempt to reschedule the diversity user that at least one is affected, and if success, then reschedule the receiver that uses described available selected subband.
59. method according to claim 1 also comprises:
Some resources of enduringly assignment in a plurality of time slots, and other resource of impermanently assignment.
60. 9 described methods according to claim 5 also comprise:
In some resources of enduringly assignment of beginning of each time slot, utilize described persistent assignments or not afterwards, signaling is used in reference to and is shown with how many resources by the information of persistent assignments.
61. 9 described methods also comprise and utilize asynchronous mixed automatic retransmission request to be used for retransmitting according to claim 5, and to all higher priority of grouping of dividing the non-re-transmissions of component proportion that is retransmitted.
62. method according to claim 1 also comprises:
For given dispatching cycle, the assignment sub-band channel is until an assignment threshold value.
63. 2 described methods according to claim 6, wherein for given dispatching cycle, the assignment sub-band channel until an assignment threshold value comprise:
At first assignment sub-band channel is until described assignment threshold value;
Utilize sub-band channel to distribute afterwards remaining subcarrier, the definition diversity channel.
64. 2 described methods according to claim 6, wherein for given dispatching cycle, the assignment sub-band channel until an assignment threshold value comprise:
The assignment sub-band channel is until described assignment threshold value;
Utilize all OFDM subcarriers definition diversity subchannels, and with the diversity subchannel assignment to diversity channel;
Be transmitted in each breakdown diversity channel in the sub-carrier positions common between the sub-band channel of diversity channel and distribution.
65. method according to claim 1 also comprises:
For VoIP business enduringly assignment subband or diversity channel transfer resource.
66. 5 described methods according to claim 6 also comprise:
By calling out one of two MCS of beginning assignment (modulation and encoding scheme) layer, and if detect that great changes have taken place in the CQI of average report of receiver then only change the MCS layer, use one of two MCS layer VoIP business.
67. 6 described methods according to claim 6 also comprise:
If travelling carriage has been reported the CQI of the MCS that is mapped to the MCS that is higher than operation, then transmitting power is reduced for the specified amount of the difference of two MCS layers; And
If travelling carriage has been reported the CQI of the MCS that is mapped to the MCS that is lower than operation, then do not carry out power adjustments.
68. a method that is used for the OFDM channelizing comprises:
Utilize a plurality of subcarriers in the OFDM frequency band to receive the OFDM symbol;
Described OFDM symbol jointly comprises diversity channel and sub-band channel, a plurality of subcarriers that each diversity channel utilization distributes at the OFDM frequency band, and each sub-band channel is utilized the sub-carrier set of adjacency in the described OFDM frequency band;
At least some OFDM symbols comprise the subcarrier that is utilized by sub-band channel and the subcarrier that is utilized by diversity channel simultaneously;
Described a plurality of subcarriers are further divided into a plurality of Resource Block, and each Resource Block comprises the contiguous subcarrier of the fixed qty at least one OFDM symbol duration;
By with described a plurality of OFDM subcarriers take the frequency partition that transmits through M 〉=1 sub-slots in time as N 〉=2 subband, definition comprises the time slot in N * M Resource Block space, each sub-slots comprises L 〉=1 an OFDM symbol;
For diversity channel uses or sub-band channel is used that one of them integrally distributes each Resource Block; And
Receive the signaling information of indicating to extract which diversity channel or sub-band channel.
69. 8 described methods according to claim 6 also comprise:
Receive and allow to determine that diversity channel and sub-band channel are the signaling informations how to define.
70. 9 described methods according to claim 6, wherein said signaling information comprises the sign that is taken by sub-band channel about which subcarrier, and described diversity channel utilizes remaining subcarrier to come the systematization definition.
71. a transmitter comprises:
Produce the OFDM modulator that the OFDM symbol is used for transmission from a plurality of inputs;
With the input of sign map to the OFDM modulator, so that the OFDM symbol jointly comprises the channelizer of diversity channel and sub-band channel, a plurality of subcarriers that each diversity channel utilization distributes at the OFDM frequency band, and each sub-band channel is utilized the sub-carrier set of the adjacency in the OFDM frequency band, so that at least some OFDM symbols comprise the subcarrier that is utilized by sub-band channel and the subcarrier that is utilized by diversity channel simultaneously, and described a plurality of subcarriers are further divided into a plurality of Resource Block, and each Resource Block comprises the contiguous subcarrier of the fixed qty at least one OFDM symbol duration; By with described a plurality of OFDM subcarriers take the frequency partition that transmits through M 〉=1 sub-slots in time as N 〉=2 subband, definition comprises the time slot in N * M Resource Block space, each sub-slots comprises L 〉=1 an OFDM symbol; And use or sub-band channel is used that one of them integrally distributes each Resource Block for diversity channel.
72. a system that is used for the OFDM channelizing comprises:
At least one transmitter and at least one receiver;
The OFDM symbol that described at least one transmitter and described at least one receiver utilization jointly comprise diversity channel and sub-band channel communicates, a plurality of subcarriers that each diversity channel utilization distributes at the OFDM frequency band, each sub-band channel is utilized the sub-carrier set of the adjacency in the OFDM frequency band, so that at least some OFDM symbols comprise the subcarrier that is utilized by sub-band channel and the subcarrier that is utilized by diversity channel simultaneously, and described a plurality of subcarriers are further divided into a plurality of Resource Block, and each Resource Block comprises the contiguous subcarrier of the fixed qty at least one OFDM symbol duration; By with described a plurality of OFDM subcarriers take the frequency partition that transmits through M 〉=1 sub-slots in time as N 〉=2 subband, definition comprises the time slot in N * M Resource Block space, each sub-slots comprises L 〉=1 an OFDM symbol; And use or sub-band channel is used that one of them integrally distributes each Resource Block for diversity channel.
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