CN103220809A - Downlink physical control channel sending method and receiving method and corresponding devices - Google Patents
Downlink physical control channel sending method and receiving method and corresponding devices Download PDFInfo
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Abstract
The invention discloses a downlink physical control channel sending method and a receiving method and corresponding devices. According to the downlink physical control channel sending method, when an eNodeB sends a downlink physical control channel of user equipment (UE), the downlink physical control channel of the UE is mapped onto the central frequency domain position of the system bandwidth of the second time slot of a subframe, and downlink control information of the UE is carried by the downlink physical control channel and sent. The downlink physical control channel sending device comprises a mapping module and a sending module. According to the downlink physical control channel receiving method, when the UE judges that the system bandwidth is larger than a first pre-defined bandwidth, the downlink physical control channel is detected at the central frequency domain position of the system bandwidth of the second time slot of the subframe, and the downlink control information of the UE is analyzed and obtained from the downlink physical control channel. The downlink physical control channel receiving device comprises a judging module, a detecting module and an analyzing module. According to the downlink physical control channel sending method and the receiving method and the corresponding devices, the cost of terminal equipment based on long term evolution (LTE) is reduced greatly on the basis that the system performance of the LTE is not affected, and original spectrum effectiveness can be improved.
Description
Technical field
The present invention relates to wireless communication field, be specifically related to a kind of sending, receiving method and related device of downlink physical control channel.
Background technology
Machine class communication user equipment (Machine Type Communication User Equipment is called for short MTC UE) claims M2M (Machine To Machine) user communication device again, is the main application form of present stage Internet of Things.But low power consumption and low cost is the important leverage of its large-scale application.At present, the M2M technology has obtained the support of international well-known manufacturers such as NEC, HP, CA, Intel, IBM, AT﹠T and the approval of various countries mobile operator.The M2M equipment of existing market deploy is mainly based on GSM (Global System of Mobile communication, global mobile communication) system.In recent years, because the spectrum efficiency height of LTE (Long Term Evolution, Long Term Evolution), increasing mobile operator selects the evolution direction of LTE as the future wireless system.Many kinds of class data services of M2M based on LTE will be more attractive also.It is lower than the MTC terminal of gsm system to have only the one-tenth instinct of LTE-M2M equipment to accomplish, the M2M business could really forward in the LTE system from GSM.
The cost that influences MTC UE mainly is Base-Band Processing and radio frequency.And reduce to send and receive bandwidth is to reduce a kind of very effective mode of MTC UE cost.The maximum support transmitting-receiving bandwidth that is MTC UE is less than the traditional LTE terminal of routine (Ordinary Legacy R8/9/10 UE is called for short OL UE) desired maximum transmitting-receiving bandwidth 20MHz under single carrier wave.The reception of MTC UE and send bandwidth and can be set to the little bandwidth that 1.4MHz or LTE systems such as 3MHz or 5MHz are supported.
Radio frames in the LTE system (RF, Radio Frame) comprises the frame structure of Frequency Division Duplexing (FDD) (FDD, Frequency Division Duplex) pattern and time division duplex (TDD, Time Division Duplex) pattern.
As shown in Figure 1, Fig. 1 is the frame structure schematic diagram of fdd mode in the existing LTE technology.The radio frames of one 10 milliseconds (ms) is that 0.5ms, numbering 0～19 time slot (slot) are formed by 20 length, and time slot 2i and 2i+1 composition length are subframe (subframe) i of 1ms.
As shown in Figure 2, Fig. 2 is the frame structure schematic diagram of tdd mode in the existing LTE technology.The radio frames of a 10ms is longly formed for the field of 5ms (half frame) by two, and a field comprises that 5 length are the subframe of 1ms, and subframe i is defined as two and longly is time slot 2i and the 2i+1 of 0.5ms.
In above-mentioned two kinds of frame structures, for standard cyclic prefix (Normal CP, Normal Cyclic Prefix), the symbol that it is 66.7 microseconds (us) that time slot comprises 7 length, wherein, the CP length of first symbol is 5.21us, and the CP length of all the other 6 symbols is 4.69us; For extended cyclic prefix (Extended CP, Extended Cyclic Prefix), a time slot comprises 6 symbols, and the CP length of all symbols is 16.67us.
Following three kinds of downlink physical control channels have been defined among the LTE: physical down control format indicating channel (PCFICH, Physical Control Format Indicator Channel), the automatic repeat requests indicating channel of physical mixed (PHICH, Physical Hybrid Automatic Retransmission Request Indicator Channel), Physical Downlink Control Channel (PDCCH, Physical Downlink Control Channel).The time-frequency structure of each physical channel of descending sub frame as shown in Figure 3.
Wherein, PCFICH is positioned at first symbol of subframe, is used to refer to PDCCH control signaling occupies symbol in a subframe number.For downlink bandwidth
Situation, control format indication (CFI) desirable 1,2 or 3.For
Desirable 2,3 or 4, i.e. CFI+1.
PHICH is positioned at first symbol or first three symbol of subframe, is used to carry the ACK/NACK feedback information to up PUSCH.
PDCCH is used for bearing downlink control information (DCI, Downlink Control Information), comprising: uplink and downlink schedule information, and uplink power control information.The number of symbols that time domain specifically occupies is indicated by PCFICH.Frequency domain position is mapped to whole bandwidth.
The MTC UE of low-cost limited bandwidth inserts the LTE system, has some problems.Wherein topmost is exactly that three kinds of downlink physical control channels interweave for the total system bandwidth, and MTC UE can not receive the phase related control information fully because of limited bandwidth.Have a strong impact on the reception of LTE system descending data and the transmission of MTC UE upstream data.
Successfully receive LTE downlink transmission data and terminal at low-cost limited bandwidth MTC UE and relevant issues such as how to insert, do not propose effective solution at present as yet.
Summary of the invention
Technical problem to be solved by this invention provides a kind of sending method and dispensing device of downlink physical control channel, and a kind of delivery plan of new downlink physical control channel is provided for LTE UE.
For solving the problems of the technologies described above, the invention provides a kind of sending method of downlink physical control channel, comprising:
Base station (eNodeB) is when sending the downlink physical control channel of subscriber equipment (UE), the downlink physical control channel of this UE is mapped to the center frequency domain position of the system bandwidth of second time slot of subframe, the Downlink Control Information of this UE of carrying and sending on described downlink physical control channel.
For solving the problems of the technologies described above, the present invention also provides a kind of dispensing device of downlink physical control channel, is positioned at eNodeB, comprises mapping block and sending module:
Described mapping block is used for the downlink physical control channel of this UE being mapped to the center frequency domain position of the system bandwidth of second time slot of subframe when sending the downlink physical control channel of UE;
Described sending module is used for Downlink Control Information and the transmission of this UE of carrying on described downlink physical control channel.
Technical problem to be solved by this invention provides a kind of method of reseptance and receiving system of downlink physical control channel, and a kind of reception programme of new downlink physical control channel is provided for LTE UE.
For solving the problems of the technologies described above, the invention provides a kind of method of reseptance of downlink physical control channel, comprising:
When UE judges system bandwidth greater than the first predefine bandwidth, frequency domain position detects downlink physical control channel at the center of the system bandwidth of second time slot of subframe, resolve the Downlink Control Information that obtains this UE from described downlink physical control channel, the width of described center frequency domain is the second predefine bandwidth, and the described first predefine bandwidth is more than or equal to the described second predefine bandwidth.
For solving the problems of the technologies described above, the present invention also provides a kind of receiving system of downlink physical control channel, is positioned at UE, comprises judge module, detection module and parsing module, wherein:
Described judge module is used to judge that whether system bandwidth is greater than the first predefine bandwidth;
Described detection module is used for when described judge module is judged system bandwidth greater than the first predefine bandwidth, detects downlink physical control channel at the center frequency domain position of the system bandwidth of second time slot of subframe; The width of described center frequency domain is the second predefine bandwidth, and the described first predefine bandwidth is more than or equal to the described second predefine bandwidth;
Described parsing module is used for resolving the Downlink Control Information that obtains this UE from described downlink physical control channel.
The method and apparatus that the application of the invention embodiment is proposed, be applicable to LTE UE, be specially adapted to MTC UE, this method reduces the terminal equipment cost based on LTE greatly on the basis that does not influence the LTE systematic function, can solve the MTC terminal downlink data receiving of limited bandwidth and the problem that successfully inserts the LTE system in addition, promote the MTC business from the evolution of gsm system, and can improve original spectrum efficiency to the LTE system.
Description of drawings
Fig. 1 is the frame structure schematic diagram of fdd mode among the LTE;
Fig. 2 is the frame structure schematic diagram of tdd mode among the LTE;
Fig. 3 is a down channel subframe time-frequency structure schematic diagram among the LTE;
Fig. 4 is an embodiment of the invention 1eNodeB side downlink physical control channel process of transmitting schematic diagram;
Fig. 5 is the embodiment of the invention 1 a dispensing device structural representation;
Fig. 6 is an embodiment of the invention 2MTC UE side downlink physical control information receiving course schematic diagram;
Fig. 7 is the embodiment of the invention 2 receiving system structural representations;
Fig. 8 is for using example 1 downlink physical control channel sub-frame configuration schematic diagram;
Fig. 9 is for using example 2 downlink physical control channel sub-frame configuration schematic diagrames;
Figure 10 is for using example 3 downlink physical control channel sub-frame configuration schematic diagrames;
Figure 11 is for using example 4 downlink physical control channel sub-frame configuration schematic diagrames;
Figure 12 is for using example 5 downlink physical control channel sub-frame configuration schematic diagrames.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, hereinafter will be elaborated to embodiments of the invention in conjunction with the accompanying drawings.Need to prove that under the situation of not conflicting, embodiment among the application and the feature among the embodiment be combination in any mutually.
Present embodiment is described the sending method of downlink physical control channel, as shown in Figure 4, may further comprise the steps:
Step 101, base station (eNodeB) is mapped to the downlink physical control channel of this UE the center frequency domain position of the system bandwidth of second time slot of subframe when sending the downlink physical control channel of subscriber equipment (UE);
Preferably, this UE comprises MTC UE, is specifically as follows the MTC UE of low-cost limited bandwidth.
Preferably, whether this eNodeB judges system bandwidth greater than the first predefine bandwidth earlier when sending the downlink physical control channel of UE, if then the downlink physical control channel of UE is mapped to the center frequency domain position of the system bandwidth of second time slot of subframe; If not (being less than or equal to), then send the downlink physical control channel (PCFICH, PDCCH, PHICH) of UE according to prior art.The width of above-mentioned center frequency domain is the second predefine bandwidth, and the first predefine bandwidth is more than or equal to the second predefine bandwidth.The maximum that this first predefine bandwidth is UE receives bandwidth, the descending control area bandwidth that this second predefine bandwidth is UE (or claims the system of UE to receive bandwidth, be the bandwidth that UE receives the frequency domain region of downlink physical control channel), be that the centre frequency with system bandwidth is one section bandwidth of centre frequency.The first predefine bandwidth and the second predefine bandwidth all can dispose in the following ways: preset or disposed by signaling.The second predefine bandwidth of the MTC UE of common low-cost limited bandwidth less than the first predefine bandwidth less than system bandwidth.
Preferably, eNodeB can be mapped to this downlink physical control channel following time-domain position: preceding n OFDM (OFDM of second time slot of subframe, Orthogonal Frequency Division Multiplexing) symbol, wherein, n is less than the sum of the OFDM symbol of described subframe second time slot.
Particularly, above-mentioned downlink physical control channel comprises: at least a among PCFICH, PDCCH and the PHICH;
Be preferably in the following combination any one: PDCCH and PHICH; PCFICH and PDCCH; PCFICH, PDCCH and PHICH; PDCCH; PHICH.
If comprise PCFICH and PDCCH, then this PCFICH is positioned at first OFDM symbol of second time slot of subframe, and this PDCCH is positioned at preceding n OFDM symbol of second time slot of subframe, and particular location is by this PCFICH configuration.
If comprise PDCCH and PHICH, promptly when not comprising PCFICH, time-frequency position that can pre-defined PDCCH for example is configured on preceding n the predefined OFDM symbol of second time slot of subframe.
When comprising PHICH, this PHICH can be positioned at the 1st OFDM symbol of second time slot of subframe, or preceding 3 OFDM symbols of second time slot of subframe.Preferably, the quantity of this PHICH and time domain length information are disposed by signaling or are preset value, if adopt the signaling configuration, this signaling bear is on PBCH (Physical Broadcast Channel).
Preferably, the transmission mode of above-mentioned downlink physical control channel is a diversity mode.
For the FDD system, the control area at this downlink physical control channel place is not positioned at subframe 0, and promptly eNodeB is mapped to other one or more subframes except that subframe 0 with this downlink physical control channel.
For the TDD system, the control area at this downlink physical control channel place is not positioned at subframe 0, sub-frame of uplink and comprises DwPTS (Downlink Pilot Time Slot, descending pilot frequency time slot) special subframe, promptly eNodeB is mapped to this downlink physical control channel except that subframe 0, sub-frame of uplink and comprises other one or more subframes the special subframe of DwPTS.
Step 102, eNodeB carries the Downlink Control Information of this UE and sends on above-mentioned downlink physical control channel.
Preferably, eNodeB also sends the PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel) of UE when sending downlink physical control channel.Particularly: the time domain zone of this PDSCH is: in the subframe from predefined OFDM symbol (k OFDM symbol, the k value is for preset value or by signaling configuration) begin to last OFDM symbol of subframe, remove residue OFDM symbol behind the OFDM symbol at above-mentioned channel place.Preferably, if when comprising synchronizing channel and/or Physical Broadcast Channel in the subframe, then this eNodeB is mapped to PDSCH remaining time domain OFDM symbol behind the time domain OFDM symbol of removing above-mentioned channel (synchronizing channel and/or PBCH) place in this time domain zone.
Realize the dispensing device of said method, be positioned at eNodeB, as shown in Figure 5, comprise mapping block and sending module:
This mapping block is used for the downlink physical control channel of this UE being mapped to the center frequency domain position of the system bandwidth of second time slot of subframe when sending the downlink physical control channel of UE;
This sending module is used for Downlink Control Information and the transmission of this UE of carrying on this downlink physical control channel.
Preferably, this device also comprises judge module, and it is used to judge that whether system bandwidth is greater than the first predefine bandwidth;
Described mapping block is used for the downlink physical control channel of described UE being mapped to the center frequency domain position of the system bandwidth of second time slot of subframe when described judge module is judged system bandwidth greater than the first predefine bandwidth; The width of described center frequency domain is the second predefine bandwidth, and the described first predefine bandwidth is more than or equal to the described second predefine bandwidth.
The maximum that this first predefine bandwidth is UE receives bandwidth, and the system that this second predefine bandwidth is UE receives bandwidth (or claiming descending control area bandwidth).The above-mentioned first predefine bandwidth adopts preset value or is disposed by signaling.Similarly, this second predefine bandwidth adopts preset value or is disposed by signaling.
Preferably, this mapping block is mapped to following time-domain position with described downlink physical control channel: preceding n OFDM symbol of second time slot of subframe, wherein, n is less than the sum of the OFDM symbol of described subframe second time slot.
Above-mentioned downlink physical control channel comprises with in the lower channel one or several: PCFICH, PDCCH and PHICH.
When downlink physical control channel comprised PCFICH, this mapping block was mapped to this PCFICH the 1st OFDM symbol of second time slot of subframe.
When downlink physical control channel comprised PHICH, this mapping block was mapped to the 1st OFDM symbol of second time slot of subframe or preceding 3 OFDM symbols of second time slot of subframe with this PHICH.
Preferably, above-mentioned sending module adopts diversity mode to send downlink physical control channel.
In the FDD system, mapping block is to be used for shining upon in the following ways downlink physical control channel: this downlink physical control channel is mapped to other one or more descending sub frames except that subframe 0.
In the TDD system, mapping block is to be used for shining upon in the following ways downlink physical control channel: be mapped to this downlink physical control channel except that subframe 0, sub-frame of uplink and comprise other one or more descending sub frames the special subframe of descending pilot frequency time slot (DwPTS).
Preferably, this mapping block also is used in the mapping downlink physical control channel, with the PDSCH of described UE, be mapped to following time domain zone: remove remaining OFDM symbol behind the OFDM symbol at downlink physical control channel place in the subframe last OFDM symbol from predefined OFDM sign-on to subframe; This sending module also is used for sending the PDSCH of UE when sending downlink physical control channel.
When comprising synchronizing channel and/or Physical Broadcast Channel in the subframe, this mapping block is to be used for shining upon described PDSCH in the following ways: this PDSCH is mapped to described time domain zone removes remaining OFDM symbol behind the OFDM symbol at above-mentioned channel place.
Present embodiment is described the method for reseptance of downlink physical control channel, as shown in Figure 6, may further comprise the steps:
Preferably, this UE comprises MTC UE.
The first predefine bandwidth is that the maximum of UE receives bandwidth, and the second predefine bandwidth is the descending control area bandwidth (perhaps the system of UE receives bandwidth) of UE.Preferably, this first predefine bandwidth adopts preset value or is disposed by signaling; Similarly, this second predefine bandwidth also can adopt preset value or be disposed by signaling.
Preferably, UE detects downlink physical control channel at following time-domain position: preceding n OFDM symbol of second time slot of subframe, wherein, n is less than the sum of the OFDM symbol of this subframe second time slot.
The downlink physical control channel that UE detects comprises with in the lower channel one or several: PCFICH, PDCCH and PHICH.
Be preferably in the following combination any one: PDCCH and PHICH; PCFICH and PDCCH; PCFICH, PDCCH and PHICH; PDCCH; PHICH.
In the FDD system, UE detects downlink physical control channel in following subframe: the one or more descending sub frames of other except that subframe 0.
In the TDD system, UE detects downlink physical control channel in following subframe: except that subframe 0, sub-frame of uplink and comprise other one or more descending sub frames the special subframe of DwPTS.
After UE obtains Downlink Control Information, UE is according to the indication of described Downlink Control Information, receives PDSCH from following time domain zone: remove remaining OFDM symbol behind the OFDM symbol at described downlink physical control channel place the subframe last OFDM symbol from predefined OFDM sign-on to subframe.When comprising synchronizing channel and/or Physical Broadcast Channel in the subframe, remaining OFDM symbol receives described PDSCH UE removes the OFDM symbol at above-mentioned channel place from described time domain zone after.
Realize the receiving system of said method, be positioned at UE, as shown in Figure 7, comprise judge module, detection module and parsing module, wherein:
This judge module is used to judge that whether system bandwidth is greater than the first predefine bandwidth;
This detection module is used for when described judge module is judged system bandwidth greater than the first predefine bandwidth, detects downlink physical control channel at the center frequency domain position of the system bandwidth of second time slot of subframe; The width of described center frequency domain is the second predefine bandwidth, and the described first predefine bandwidth is more than or equal to the described second predefine bandwidth;
This parsing module is used for resolving the Downlink Control Information that obtains this UE from described downlink physical control channel.
As previously mentioned, the maximum that this first predefine bandwidth is UE receives bandwidth, and the second predefine bandwidth is that the system of UE receives bandwidth.The first predefine bandwidth can adopt preset value or be disposed by signaling.Similarly, this second predefine bandwidth also can adopt preset value or be disposed by signaling.
Preferably, this detection module is used for detecting described downlink physical control channel at following time-domain position: preceding n OFDM symbol of second time slot of subframe, wherein, n is less than the sum of the OFDM symbol of described subframe second time slot.
In the FDD system, described detection module detects downlink physical control channel in following subframe: the one or more descending sub frames of other except that subframe 0.
In the TDD system, described detection module detects downlink physical control channel in following subframe: except that subframe 0, sub-frame of uplink and comprise other one or more descending sub frames the special subframe of descending pilot frequency time slot (DwPTS).
Preferably, this UE also comprises the PDSCH receiver module, be used for the indication of the Downlink Control Information that is resolved to according to described parsing module, receive PDSCH: remove remaining OFDM symbol behind the OFDM symbol at described downlink physical control channel place the subframe from predefined OFDM sign-on to subframe last OFDM symbol from following time domain zone.
When comprising synchronizing channel and/or Physical Broadcast Channel in subframe, the PDSCH receiver module also is used for: remaining OFDM symbol receives described PDSCH remove the OFDM symbol at above-mentioned channel place from described time domain zone after.
Be example with MTC UE below, the foregoing description method described by some application examples.The reception of this MTC UE and transmission bandwidth are predeterminable to be the little bandwidth that 1.4MHz or LTE systems such as 3MHz or 5MHz are supported, perhaps disposes by high-level signaling.Represent that by before channel name, increasing " M-" this channel is the channel of MTC UE in the following application example, only be used for difference, not as a limitation of the invention.
Use example 1
This example describes at the situation that downlink physical control channel comprises M-PCFICH, M-PHICH and M-PDCCH.In this example, system bandwidth is 10MHz, and the transmitting-receiving bandwidth of MTC UE is 1.4MHz, 6 RB.
ENodeB side transmitting channel process as shown in Figure 4, at first, eNodeB judges, system bandwidth and the predefined bandwidth of MTC UE are compared, system bandwidth is obviously greater than the predefined bandwidth of MTCUE, so adopt channel time-frequency mapping position shown in Figure 8 to send the downlink physical control channel of the MTC UE of this low cost limited bandwidth in this example:
The frequency domain position in The whole control zone is positioned at 6 RB in system bandwidth center, and time domain is preceding 3 OFDM symbols of second time slot of subframe.Wherein:
The M-PCFICH value is 2,3 or 4.For each antenna port, CFI information symbol group after the coded modulation will be by to increase on four resource particle groups that sequential mode maps to second first OFDM symbol of time slot of subframe, promptly take 4 REG (Resource element group, resource particle group).M-PCFICH will transmit on the same antenna port that PBCH uses.
M-PHICH also is mapped to first OFDM symbol or first three OFDM symbol of second time slot of subframe, specifically organizes configuration informations such as number and time-domain position and is included among the PBCH.Mapping the time also is to be unit with REG, is mapped on the resource particle group of not distributing to M-PCFICH.
M-PDCCH is mapped to preceding 2-3 OFDM symbol of second time slot of subframe, and concrete number is disposed by M-PCFICH.Time-frequency region will be shared according to described control channel the OFDM symbol, remove the shared REG of M-PCFICH and M-PHICH again, the remaining mapping area that is M-PDCCH.
The M-PDSCH time-domain position of MTC UE be from the predefined OFDM sign-on of subframe to last OFDM symbol of subframe, remove above-mentioned control area.Concrete frequency domain position is specifically comprised this frame scheduling and is striden the frame scheduling dual mode by M-PDCCH control information indication.In the time of this frame scheduling of M-PDCCH, the M-PDSCH frequency domain position must be positioned at 6 RB in system bandwidth center, and when striding frame scheduling, and M-PDSCH can be positioned at system bandwidth continuous 6 RB or also be defined as 6 RB in system bandwidth center arbitrarily.
All to avoid original cell special reference (Cell-specific reference signals, band of position CRS) in the time of above-mentioned channel Mapping.
The receiving course of MTC UE side as shown in Figure 6.After the system bandwidth in reading PBCH, terminal compares system bandwidth and self predefine bandwidth earlier, MTC UE detects the down control channel of oneself in second time slot starting position of subframe in this example, solves the information of M-PCFICH, M-PHICH and M-PDCCH successively.And the DCI that carries according to M-PDCCH reads M-PDSCH.At respective physical transmitted over resources M-PUSCH, perhaps on predefine bandwidth (6 RB), transmit M-PUSCH according to the uplink scheduling information of M-PDCCH carrying.
Use example 2
This example describes at the configuring condition that downlink physical control channel only comprises M-PDCCH and M-PHICH.In this example, system bandwidth is 20MHz, and the transmitting-receiving bandwidth of MTC UE is 1.4MHz, 6 RB.
ENodeB adopts Fig. 4 flow process, judges system bandwidth greater than the predefined bandwidth of MTC UE, according to the downlink physical control channel of judged result configuration MTC Ue.The concrete configuration situation is as shown in Figure 9:
The frequency domain position in The whole control zone is positioned at 6 RB in system bandwidth center, and time domain is predefined preceding two the OFDM symbols of second time slot of subframe.Wherein:
M-PHICH is mapped to first OFDM symbol of second time slot of subframe, the group number be 3, promptly number and the time length of field be preset value.
M-PDCCH is mapped to predefined preceding two the OFDM symbols of second time slot of subframe, need not the M-PCFICH configuration.Time-frequency region will be shared according to all downlink physical control channels the OFDM symbol, remove the shared REG of M-PHICH again, surplus resources is the mapping area of M-PDCCH.
The M-PDSCH time-domain position of MTC UE is to last OFDM symbol of subframe, the control area of removing above-mentioned downlink physical control channel from the predefined OFDM sign-on of subframe.Frequency domain position is indicated by the M-PDCCH control information.Comprise this frame scheduling and stride the frame scheduling dual mode.
All to avoid the band of position of original CRS in the time of above-mentioned channel Mapping.
The receiving course of MTC UE side as shown in Figure 6.According to judged result, MTC UE is at the downlink physical control channel of second predefined preceding two symbol detection oneself of time slot of subframe.Solve the information of M-PHICH and M-PDCCH, read M-PDSCH.At respective physical transmitted over resources M-PUSCH, perhaps just on the predefine bandwidth, transmit M-PUSCH according to the uplink scheduling information of M-PDCCH carrying.
Use example 3
This example describes at the configuring condition that downlink physical control channel only comprises M-PDCCH.In this example, system bandwidth is 20MHz, and the transmitting-receiving bandwidth of MTC UE is 1.4MHz, 6 RB.
ENodeB adopts Fig. 4 flow process, judges earlier, judges that system bandwidth greater than the predefined bandwidth of MTC UE, disposes the downlink physical control channel of MTC UE then.The concrete configuration situation is as shown in figure 10:
The frequency domain position in The whole control zone is positioned at 6 RB in system bandwidth center, and time domain is predefined first three the OFDM symbol of second time slot of subframe.Wherein:
M-PDCCH is mapped to predefined first three the OFDM symbol of second time slot of subframe, need not the M-PCFICH indication.
The M-PDSCH time-domain position of MTC UE is to last OFDM symbol of subframe, the control area of removing above-mentioned M-PDCCH from the predefined OFDM sign-on of subframe.Frequency domain position is indicated by the M-PDCCH control information.Comprise this frame scheduling and stride the frame scheduling dual mode.
To avoid the band of position of original CRS in the time of channel Mapping.
The receiving course of MTC UE side as shown in Figure 6.According to judged result, MTC UE detects the down control channel of oneself at second time slot of subframe.Blind check goes out the information of M-PDCCH, reads corresponding M-PDSCH.According to the uplink scheduling information of M-PDCCH carrying at respective physical transmitted over resources M-PUSCH.Perhaps just on the predefine bandwidth, transmit M-PUSCH.And M-PUSCH adopts dynamic TTI bundling, perhaps utilizes UL Grant to retransmit, and guarantees accuracy.
Use example 4
In this example, system bandwidth is 1.4MHz, and the transmitting-receiving bandwidth of MTC UE also is 1.4MHz, 6 RB.
ENodeB adopts Fig. 4 flow process, judges system bandwidth is equaled the predefined bandwidth of MTC UE, and then the collocation method by the conventional physical down control channel disposes MTC UE.
The concrete time-frequency mapping position of channel is as shown in figure 11:
Wherein, the PCFICH value is 2,3 or 4.For each antenna port.CFI information symbol group after the coded modulation will be taken 4 REG (Resource element group) by to increase on four resource particle groups that sequential mode maps to first OFDM symbol of subframe.PCFICH will transmit on the same antenna port that PBCH uses.
PHICH also is mapped to first OFDM symbol of subframe or first three OFDM symbol, specifically organizes configuration informations such as number and time-domain position and is included among the PBCH.Mapping the time also is to be unit with REG, is mapped on the resource particle group of not distributing to PCFICH.
PDCCH is mapped to preceding 2-4 OFDM symbol of subframe, and concrete number is disposed by PCFICH.Time-frequency region will be shared according to described downlink physical control channel total OFDM symbol, remove the shared REG of PCFICH and PHICH again, the remaining mapping area that is PDCCH.
The PDSCH time-domain position is for removing described control area residue OFDM symbol.Concrete frequency domain position is indicated by the PDCCH control information.
After the system bandwidth of MTC UE side in reading PBCH, terminal compares system bandwidth and self predefine bandwidth earlier, because system bandwidth equals MTC UE self predefine bandwidth, then MTC UE is according to the traditional technique in measuring Physical Downlink Control Channel, solve the information of PCFICH, PHICH and PDCCH successively, and read PDSCH according to the DCI of PDCCH carrying, or, PUSCH sent.
Use example 5
This example describes at the configuring condition that downlink physical control channel only wraps M-PHICH.In this example, system bandwidth is 20MHz, and the transmitting-receiving bandwidth of MTC UE is 1.4MHz, 6 RB.
ENodeB adopts Fig. 4 flow process, judges system bandwidth greater than the predefined bandwidth of MTC UE, according to the downlink physical control channel of judged result configuration MTC Ue.The concrete configuration situation is as shown in figure 12:
The frequency domain position in The whole control zone is positioned at 6 RB in system bandwidth center, and time domain is predefined preceding 1 the OFDM symbol of second time slot of subframe.Wherein:
M-PHICH is mapped to first OFDM symbol of second time slot of subframe, the group number be 1, promptly number and the time length of field be preset value.
The M-PDSCH time-domain position of MTC UE be from the predefined OFDM sign-on of subframe to last OFDM symbol of subframe, remove the RE (Resource element, resource particle) that above-mentioned M-PHICH shines upon.Frequency domain position is by the Downlink Control Information decision of ePDCCH carrying.Comprise this frame scheduling and stride the frame scheduling dual mode.
All to avoid the band of position of original CRS in the time of above-mentioned channel Mapping.
The receiving course of MTC UE side as shown in Figure 6.According to judged result, MTC UE is at the downlink physical control channel of second time slot of subframe predefined previous symbol detection oneself.Solve M-PHICH information; Separate ePDCCH, the Downlink Control Information (schedule information of M-PDSCH) according to the ePDCCH carrying reads M-PDSCH, Downlink Control Information (uplink scheduling information) according to the ePDCCH carrying, at respective physical transmitted over resources M-PUSCH, perhaps, on the predefine bandwidth, transmit M-PUSCH.
Though above-mentioned application example is the example explanation with MTC UE, the sending method of this downlink physical control channel also can be applied to other scene, is applied to other type UE, is not limited in MTC UE.
The foregoing description transmitting-receiving bandwidth to little bandwidth MTC UE is the explanation that the situation of 1.4MHz is carried out, and the processing procedure when other transmitting-receiving bandwidth is 3MHz or 5MHz is similar, and this paper repeats no more.
The present invention is on the basis of original LTE system, the transmission method of the MTC UE downlink physical control channel of low-cost limited bandwidth has been proposed, and according to this configuration, can guarantee that little bandwidth MTC UE successfully inserts the LTE network, promote the M2M business from the quick evolution of gsm system to the LTE system.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to finish by program, described program can be stored in the computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (48)
1. the sending method of a downlink physical control channel comprises:
Base station (eNodeB) is when sending the downlink physical control channel of subscriber equipment (UE), the downlink physical control channel of this UE is mapped to the center frequency domain position of the system bandwidth of second time slot of subframe, the Downlink Control Information of this UE of carrying and sending on described downlink physical control channel.
2. the method for claim 1 is characterized in that:
Described UE comprises machine class communication (MTC) UE.
3. method as claimed in claim 1 or 2 is characterized in that:
Described method also comprises: described eNodeB is when sending the downlink physical control channel of UE, if judge that system bandwidth is greater than the first predefine bandwidth, then the downlink physical control channel of described UE is mapped to the center frequency domain position of the system bandwidth of second time slot of subframe, the width of described center frequency domain is the second predefine bandwidth, and the described first predefine bandwidth is more than or equal to the described second predefine bandwidth.
4. method as claimed in claim 3 is characterized in that:
The described first predefine bandwidth adopts preset value or is disposed by signaling; The described second predefine bandwidth adopts preset value or is disposed by signaling.
5. method as claimed in claim 3 is characterized in that:
The maximum that the described first predefine bandwidth is described UE receives bandwidth, and the system that the described second predefine bandwidth is described UE receives bandwidth.
6. method as claimed in claim 1 or 2 is characterized in that:
Described downlink physical control channel comprises with in the lower channel one or several: physical down control format indicating channel (PCFICH), Physical Downlink Control Channel (PDCCH) and the automatic repeat requests indicating channel of physical mixed (PHICH).
7. method as claimed in claim 6 is characterized in that:
Described eNodeB with the time-domain position that described downlink physical control channel is mapped to is: preceding n OFDM (OFDM) symbol of second time slot of subframe, wherein, n is less than the sum of the OFDM symbol of described subframe second time slot.
8. method as claimed in claim 6 is characterized in that:
When described downlink physical control channel comprised PCFICH, described eNodeB was mapped to this PCFICH the 1st OFDM symbol of second time slot of subframe.
9. method as claimed in claim 6 is characterized in that:
When described downlink physical control channel comprised PHICH, described eNodeB was mapped to the 1st OFDM symbol of second time slot of subframe or preceding 3 OFDM symbols of second time slot of subframe with this PHICH.
10. method as claimed in claim 1 or 2 is characterized in that:
Described eNodeB adopts diversity mode to transmit described downlink physical control channel.
11. method as claimed in claim 1 or 2 is characterized in that:
In Frequency Division Duplexing (FDD) (FDD) system, described eNodeB is mapped to other one or more descending sub frames except that subframe 0 with this downlink physical control channel.
12. method as claimed in claim 1 or 2 is characterized in that:
In time division duplex (TDD) system, described eNodeB is mapped to this downlink physical control channel except that subframe 0, sub-frame of uplink and comprises other one or more descending sub frames the special subframe of descending pilot frequency time slot (DwPTS).
13. method as claimed in claim 1 or 2 is characterized in that:
Described method also comprises, when sending downlink physical control channel, described eNodeB also sends the Physical Downlink Shared Channel (PDSCH) of described UE, and described PDSCH is mapped to following time domain zone: remove remaining OFDM symbol behind the OFDM symbol at described downlink physical control channel place in the subframe last OFDM symbol from predefined OFDM sign-on to subframe.
14. method as claimed in claim 13 is characterized in that:
When sending PDSCH, described method also comprises, when comprising synchronizing channel and/or Physical Broadcast Channel in the subframe, described eNodeB is mapped to this PDSCH remaining OFDM symbol behind the OFDM symbol of removing above-mentioned channel place in the described time domain zone.
15. the method for reseptance of a downlink physical control channel comprises:
When subscriber equipment (UE) is judged system bandwidth greater than the first predefine bandwidth, frequency domain position detects downlink physical control channel at the center of the system bandwidth of second time slot of subframe, resolve the Downlink Control Information that obtains this UE from described downlink physical control channel, the width of described center frequency domain is the second predefine bandwidth, and the described first predefine bandwidth is more than or equal to the described second predefine bandwidth.
16. method as claimed in claim 15 is characterized in that:
Described UE comprises machine class communication (MTC) UE.
17., it is characterized in that as claim 15 or 16 described methods:
The described first predefine bandwidth adopts preset value or is disposed by signaling; The described second predefine bandwidth adopts preset value or is disposed by signaling.
18., it is characterized in that as claim 15 or 16 described methods:
The maximum that the described first predefine bandwidth is described UE receives bandwidth, and the system that the described second predefine bandwidth is described UE receives bandwidth.
19., it is characterized in that as claim 15 or 16 described methods:
The downlink physical control channel of described detection comprises with in the lower channel one or several: physical down control format indicating channel (PCFICH), Physical Downlink Control Channel (PDCCH) and the automatic repeat requests indicating channel of physical mixed (PHICH).
20. method as claimed in claim 19 is characterized in that:
Described UE detects downlink physical control channel at following time-domain position: preceding n OFDM (OFDM) symbol of second time slot of subframe, wherein, n is less than the sum of the OFDM symbol of described subframe second time slot.
21., it is characterized in that as claim 15 or 16 described methods:
In Frequency Division Duplexing (FDD) (FDD) system, described UE detects downlink physical control channel in following subframe: the one or more descending sub frames of other except that subframe 0.
22., it is characterized in that as claim 15 or 16 described methods:
In time division duplex (TDD) system, described UE detects downlink physical control channel in following subframe: except that subframe 0, sub-frame of uplink and comprise other one or more descending sub frames the special subframe of descending pilot frequency time slot (DwPTS).
23., it is characterized in that as claim 15 or 16 described methods:
After described UE obtains Downlink Control Information, described method also comprises, described UE is according to the indication of described Downlink Control Information, receives Physical Downlink Shared Channel (PDSCH) from following time domain zone: remove remaining OFDM symbol behind the OFDM symbol at described downlink physical control channel place the subframe last OFDM symbol from predefined OFDM sign-on to subframe.
24. method as claimed in claim 23 is characterized in that:
Described method also comprises: when comprising synchronizing channel and/or Physical Broadcast Channel in the subframe, remaining OFDM symbol receives described PDSCH described UE removes the OFDM symbol at above-mentioned channel place from described time domain zone after.
25. the dispensing device of a downlink physical control channel is positioned at base station (eNodeB), comprises mapping block and sending module:
Described mapping block is used for the downlink physical control channel of this UE being mapped to the center frequency domain position of the system bandwidth of second time slot of subframe when sending the downlink physical control channel of subscriber equipment (UE);
Described sending module is used for Downlink Control Information and the transmission of this UE of carrying on described downlink physical control channel.
26. dispensing device as claimed in claim 25 is characterized in that:
Described UE comprises machine class communication (MTC) UE.
27., it is characterized in that as claim 25 or 26 described dispensing devices:
Described device also comprises judge module, and it is used to judge that whether system bandwidth is greater than the first predefine bandwidth;
Described mapping block is used for the downlink physical control channel of described UE being mapped to the center frequency domain position of the system bandwidth of second time slot of subframe when described judge module is judged system bandwidth greater than the first predefine bandwidth; The width of described center frequency domain is the second predefine bandwidth, and the described first predefine bandwidth is more than or equal to the described second predefine bandwidth.
28. dispensing device as claimed in claim 27 is characterized in that:
The described first predefine bandwidth adopts preset value or is disposed by signaling; The described second predefine bandwidth adopts preset value or is disposed by signaling.
29. dispensing device as claimed in claim 27 is characterized in that:
The maximum that the described first predefine bandwidth is described UE receives bandwidth, and the system that the described second predefine bandwidth is described UE receives bandwidth.
30., it is characterized in that as claim 25 or 26 described dispensing devices:
Described downlink physical control channel comprises with in the lower channel one or several: physical down control format indicating channel (PCFICH), Physical Downlink Control Channel (PDCCH) and the automatic repeat requests indicating channel of physical mixed (PHICH).
31. dispensing device as claimed in claim 30 is characterized in that:
Described mapping block also is used for described downlink physical control channel is mapped to following time-domain position: preceding n OFDM symbol of second time slot of subframe, wherein, n is less than the sum of the OFDM symbol of described subframe second time slot.
32. dispensing device as claimed in claim 30 is characterized in that:
Described downlink physical control channel comprises PCFICH, and described mapping block is used for this PCFICH is mapped to the 1st OFDM symbol of second time slot of subframe.
33. dispensing device as claimed in claim 30 is characterized in that:
Described downlink physical control channel comprises PHICH, and described mapping block is used for this PHICH is mapped to the 1st OFDM symbol of second time slot of subframe or preceding 3 OFDM symbols of second time slot of subframe.
34., it is characterized in that as claim 25 or 26 described dispensing devices:
Described sending module is to be used to adopt diversity mode to send described downlink physical control channel.
35., it is characterized in that as claim 25 or 26 described dispensing devices:
In Frequency Division Duplexing (FDD) (FDD) system, described mapping block is to be used for shining upon in the following ways downlink physical control channel: this downlink physical control channel is mapped to other one or more descending sub frames except that subframe 0.
36., it is characterized in that as claim 25 or 26 described dispensing devices:
In time division duplex (TDD) system, described mapping block is to be used for shining upon in the following ways downlink physical control channel: be mapped to this downlink physical control channel except that subframe 0, sub-frame of uplink and comprise other one or more descending sub frames the special subframe of descending pilot frequency time slot (DwPTS).
37., it is characterized in that as claim 25 or 26 described dispensing devices:
Described mapping block also is used in the mapping downlink physical control channel, Physical Downlink Shared Channel (PDSCH) with described UE is mapped to following time domain zone: remove remaining OFDM symbol behind the OFDM symbol at described downlink physical control channel place in the subframe last OFDM symbol from predefined OFDM sign-on to subframe;
Described sending module also is used for sending the PDSCH of described UE when sending downlink physical control channel.
38. dispensing device as claimed in claim 37 is characterized in that:
When comprising synchronizing channel and/or Physical Broadcast Channel in the subframe, described mapping block is to be used for shining upon described PDSCH in the following ways: this PDSCH is mapped to described time domain zone removes remaining OFDM symbol behind the OFDM symbol at above-mentioned channel place.
39. the receiving system of a downlink physical control channel is positioned at subscriber equipment (UE), comprises judge module, detection module and parsing module, wherein:
Described judge module is used to judge that whether system bandwidth is greater than the first predefine bandwidth;
Described detection module is used for when described judge module is judged system bandwidth greater than the first predefine bandwidth, detects downlink physical control channel at the center frequency domain position of the system bandwidth of second time slot of subframe; The width of described center frequency domain is the second predefine bandwidth, and the described first predefine bandwidth is more than or equal to the described second predefine bandwidth;
Described parsing module is used for resolving the Downlink Control Information that obtains this UE from described downlink physical control channel.
40. receiving system as claimed in claim 39 is characterized in that:
Described UE comprises machine class communication (MTC) UE.
41., it is characterized in that as claim 39 or 40 described receiving systems:
The described first predefine bandwidth adopts preset value or is disposed by signaling; The described second predefine bandwidth adopts preset value or is disposed by signaling.
42., it is characterized in that as claim 39 or 40 described receiving systems:
The maximum that the described first predefine bandwidth is described UE receives bandwidth, and the system that the described second predefine bandwidth is described UE receives bandwidth.
43., it is characterized in that as claim 39 or 40 described receiving systems:
Described downlink physical control channel comprises with in the lower channel one or several: physical down control format indicating channel (PCFICH), Physical Downlink Control Channel (PDCCH) and the automatic repeat requests indicating channel of physical mixed (PHICH).
44. receiving system as claimed in claim 43 is characterized in that:
Described detection module is used for detecting described downlink physical control channel at following time-domain position: preceding n OFDM symbol of second time slot of subframe, wherein, n is less than the sum of the OFDM symbol of described subframe second time slot.
45., it is characterized in that as claim 39 or 40 described receiving systems:
In Frequency Division Duplexing (FDD) (FDD) system, described detection module detects downlink physical control channel in following subframe: the one or more descending sub frames of other except that subframe 0.
46., it is characterized in that as claim 39 or 40 described receiving systems:
In time division duplex (TDD) system, described detection module detects downlink physical control channel in following subframe: except that subframe 0, sub-frame of uplink and comprise other one or more descending sub frames the special subframe of descending pilot frequency time slot (DwPTS).
47., it is characterized in that as claim 39 or 40 described receiving systems:
Described UE also comprises Physical Downlink Shared Channel (PDSCH) receiver module, be used for the indication of the Downlink Control Information that is resolved to according to described parsing module, receive PDSCH: remove remaining OFDM symbol behind the OFDM symbol at described downlink physical control channel place the subframe from predefined OFDM sign-on to subframe last OFDM symbol from following time domain zone.
48. receiving system as claimed in claim 47 is characterized in that:
Described PDSCH receiver module also is used for: when subframe comprises synchronizing channel and/or Physical Broadcast Channel, from described time domain zone, remove the OFDM symbol at above-mentioned channel place after remaining OFDM symbol receive described PDSCH.
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| CN201210018990.2A CN103220809B (en) | 2012-01-20 | 2012-01-20 | A kind of sending, receiving method and related device of downlink physical control channel |
| PCT/CN2012/087373 WO2013107252A1 (en) | 2012-01-20 | 2012-12-25 | Method for sending and receiving physical downlink control channel and device thereof |
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| CN201210018990.2A CN103220809B (en) | 2012-01-20 | 2012-01-20 | A kind of sending, receiving method and related device of downlink physical control channel |
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| WO2013107252A1 (en) | 2013-07-25 |
| CN103220809B (en) | 2018-08-03 |
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