CN103684675B - For down link control information transmission/method of reseptance of narrow-band user equipment - Google Patents
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Abstract
The present invention provides a kind of down link control information sending methods, including：Generation is exclusively used in the control format indicator (CFI) of narrow-band user equipment (UE), at least one orthogonal frequency division multiplexing (OFDM) symbol corresponding with physical downlink control channel (PDCCH) of narrowband UE is exclusively used in indicating downlink link subframe；OFDM symbol different from the PDCCH, primary synchronization signal and secondary synchronization signal of broadband UE is exclusively used in the downlink subframe is distributed to the Physical Control Format Indicator Channel (PCFICH) for being exclusively used in narrowband UE；And the CFI of narrowband UE is exclusively used in described in being sent in the PCFICH for being exclusively used in narrowband UE.The present invention also provides a kind of down link control information method of reseptance, base station and user equipmenies.
Description
Technical field
The present invention relates to wireless communication technology fields.More particularly it relates to for the downlink of narrow-band user equipment
Link control message transmission/method of reseptance, base station and user equipment.
Background technology
It is real that wireless communication system in Modern Significance is started in the radiotelegraphic successes of Gualielmo Marconi in 1897
It is existing.By the development in a century, wireless communication is changed into a part indispensable in popular life via high-end consumption,
Diversified trend is also presented in user equipment terminal.Cellular radio Communication system is put forward for the first time from nineteen sixty-eight by the laboratories Bell,
Just with service characteristics such as its mobility and personalizations, the consumption demand of information age has been adapted to, has become numerous wireless communication systems
The most successful model of commercialization in system.In the 21st century, 3G (Third Generation) Moblie cooperative programme tissue (3GPP, the 3rd
Generation Partnership Project) deployment long term evolution project (LTE, Long Term Evolution), purport
Increasingly diversified future communications service is being provided.In order to meet the market demand and in large scale of future home equipment communication
Internet of Things (IoT, Internet of Things) is disposed, and 3GPP decisions introduce machine communication in LTE and its future version
(MTC, Machine-Type Communication) technology, primary study have cellular communication module, by cellular network into
The machine communication of row data transmission.
MTC is also referred to as inter-machine communication (M2M, Machine-to-Machine), is a kind of number that need not artificially participate in
According to communication form.Large-scale MTC user equipmenies (UE, User Equipment) deployment, can be used for safety, track, pay a bill,
The fields such as measurement and consumer electronics.The application that MTC is specifically related to include video monitoring, the supply of material D-chain trace, intelligent electric meter, remotely
Monitoring etc..MTC requires lower power consumption, supports lower message transmission rate and lower mobility.LTE system at present
Primarily directed to the communication service of person to person (H2H, Human-to-Huam).Therefore in order to realize MTC services in LTE system
Competitive advantage and match the application prospect of MTC, key link is to realize MTC UE in large scale in LTE and its evolution system
It being capable of low cost operation in system.Meanwhile the system optimization of 3GPP LTE physical layers being needed to work.
The technical specification TR36.888 recommendations that 3GPP is released adopt the maximum support bandwidth of reduction and reduce peak rate conduct
The primary solutions of MTC costs are reduced, and suggest LTE system in existing UE (notes：In the present invention and it is described below, when
Already present UE is known as " conventional UE " or " broadband UE " in preceding LTE system version 10 (Rel-10), and broadband UE can support base station to match
The whole system bandwidth set, and with 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, 20MHz this 6 kinds of bandwidth modes) basis
On, then introduce a kind of special user device type (being denoted as MTC UE) for being applicable in MTC.Studies have shown that in current LTE system
In, the maximum bandwidth that UE is supported is down to smaller bandwidth (such as 1.4MHz, 3MHz or 5MHz) from 20MHz, can be realized
Most significant cost reduction effect.Based on newest RAN56 meetings (that is, it is wireless to hold 3GPP technical specification groups in June, 2012
Access the 56th plenary session of net) decision, for the MTC UE newly introduced, by maximum downlink (DL, DownLink) band of support
Width is down to 1.4MHz, and limit transport block size (TBS, Transmission Block Size) be 1000 bits to realize peak
It is worth the reduction of rate.In addition DL bandwidth 3MHz and 5MHz optionally, to improve the performance degradation in terms of MTC coverings.
The control information of LTE downlinks at present, including Physical Control Format Indicator Channel
(PCFICH, Physical Control Format Indicator CHannel), physical mixed autonomous retransmission is asked
Seek (HARQ, Hybrid Automatic Repeat reQuest) instruction channel (PHICH, Physical HARQ
Indicator CHannel) and physical downlink control channel (PDCCH, Physical Downlink Control
CHannel the information) carried.These three control channels are using time division multiplexing (TDM, Time-Domain
Multiplexing) form configuration is in whole system bandwidth.PCFICH and PHICH is distributed in the 1st OFDM of control area
Symbol, PDCCH are then distributed in the control areas DL.Since the MTC UE maximum bandwidths supported in narrowband are less than current base station institute
The system bandwidth (such as 20MHz) of configuration, and DL controls information is transmitted in whole system bandwidth at present, therefore narrowband
MTC UE will be unable to read DL controls information (because system bandwidth is more than the maximum bandwidth that MTC UE are supported), such as
PCFICH/PHICH/PDCCH.Information is controlled in order to realize that MTC UE read DL, and a kind of simplest method is, specially
Door is that MTC UE design a kind of novel wireless frame structure, and DL on wherein PCFICH/PHICH/PDCCH control information all will be
It is sent in the bandwidth that MTC UE are supported.But this method can not achieve backwards compatibility, i.e. broadband UE will be unable to access this
The newly-designed frame structure of class.According to the requirement of 3GPP technical specification groups, LTE evolution systems allow for version before backward compatibility
User equipment.Therefore, the above-mentioned requirement for specially designing a kind of method of frame structure and being unsatisfactory for backward compatibility.
Another method is the new control information configuration scheme of design, is supporting low cost narrowband MTCUE in existing LTE systems
While work in system, it is necessary to take into account the operation of broadband UE.Current already present backwards compatibility solution is broadly divided into two
Big type.1st type is the DL control information of configuration MTC UE to the maximum extent, and the 2nd type is to retain to the maximum extent
The control areas DL of the broadbands LTE UE.
Specifically, (R1-122804, Additional comments on cost the evaluation for of bibliography 1
MTC, 3GPP TSG RAN WG1 #69, Qualcomm Inc., May2012) the 1st type is represented, it proposes：Supporting MTC behaviour
In the LTE subframes of work, the PDCCH region of LTE broadband UE will be supported to be limited in the 1st OFDM symbol of the 1st time slot, supported
The PDCCH region of MTC is then initially configured from the 2nd OFDM symbol.Bibliography 2 (R1-120799, Backwards
Compatible support for reduced bandwidth LTE UEs, 3GPP TSG RAN WG1 #68,
IPWireless Inc., February 2012) the 2nd type is represented, it proposes：In the subframe for supporting MTC operations, the is reserved
PDCCH region of preceding 3 OFDM symbols of 1 time slot as the broadbands LTE UE, and be MTC configuration PDCCH region then from the 4th
A OFDM starts.
Information configuration scheme is controlled with the 1st kind of DL that bibliography 1 is representative, because it is configured by the broadbands LTE UE
PDCCH only takes up 1 OFDM symbol, therefore the number of the supported broadband UE of the program can be less than the allocation plan of existing LTE, cause
Part broadband UE cannot be dispatched.On the other hand, it is the 2nd class allocation plan of representative with bibliography 2, in subframe 0 and subframe 5
In, it is more than 2 OFDM symbols if the MTC UE PDCCH time domain lengths configured, can causes and be located at the 1st time slot last 2
A OFDM symbol primary synchronization signal (PSS, Primary Synchronization Signal) and secondary synchronization signal (SSS,
Secondary Synchronization Signal) it overlaps, it causes to conflict.In addition, when configuring broadband UE in any subframe
PDCCH when being 1 or 2 OFDM symbols, resource utilization can be caused low, because its PDCCH for MTC UE configuration is still
Since the 4th OFDM symbol, there will be 1~2 OFDM between the PDCCH of the PDCCH and MTC UE of broadband UE at this time
Symbol is idle, influences the effective rate of utilization of resource unit in subframe (RE, Resource Element).
Therefore need a kind of new DL controls information configuration scheme, can fully coordinate the broadbands LTE UE and narrowband UE (including
But be not limited to MTC UE) PDCCH configuration, to solve the problems, such as at least some of above-mentioned prior art.
Invention content
The object of the present invention is to while considering backwards compatibility, a kind of permission narrowband UE access broadband LTE systems are proposed
It unites (Rel-8/9/10) and its DL of evolution version controls information configuring methods, can realize the DL controls of broadband UE and narrowband UE
The configuration of information, and maximally utilise system resource.In the present invention, " narrowband UE " refers to supported maximum bandwidth and is less than
The UE of the system bandwidth of base station configuration.
According to the first aspect of the invention, a kind of down link control information sending method is provided, including：It generates special
In the control format indicator (CFI) of narrow-band user equipment (UE), in indicating downlink link subframe be exclusively used in narrowband UE's
Corresponding at least one orthogonal frequency division multiplexing (OFDM) symbol of physical downlink control channel (PDCCH)；By the downlink
The OFDM symbol different from the PDCCH, primary synchronization signal and secondary synchronization signal of broadband UE is exclusively used in is distributed to specially in link subframe
Physical Control Format Indicator Channel (PCFICH) for narrowband UE；And it is sent in the PCFICH for being exclusively used in narrowband UE
The CFI for being exclusively used in narrowband UE.
Preferably, the allocation step includes：By the 4th or the 5th in first time slot of the downlink subframe
A OFDM symbol distributes to the PCFICH for being exclusively used in narrowband UE.
The case where being equal to 1.4MHz preferably for the narrowband UE bandwidth supported：When the value of CFI instructions is 1,2 or 3
When, the PDCCH for being exclusively used in narrowband UE corresponds respectively to 2,3 or 4 OFDM in first time slot of the downlink subframe
Symbol；And when the value of CFI instructions is 4, the PDCCH for being exclusively used in narrowband UE corresponds to first of the downlink subframe
2 OFDM symbols in time slot, at least one of this 2 OFDM symbols be different from when the value that CFI indicate be 1 when be exclusively used in
At least one of corresponding 2 OFDM symbols of PDCCH of narrowband UE；Or the UE bands supported in narrowband are wider than
1.4MHz the case where：When the value of CFI instructions is 1,2 or 3, the PDCCH for being exclusively used in narrowband UE corresponds respectively to the downlink chain
1,2 or 3 OFDM symbol in first time slot of way frame；And when the value of CFI instructions is 4, it is exclusively used in narrowband UE's
PDCCH corresponds to 2 OFDM symbols in first time slot of the downlink subframe, in this 2 OFDM symbols at least
One is different from when the value that CFI indicate is 2 in corresponding with the PDCCH for being exclusively used in narrowband UE 2 OFDM symbols at least
One.
Preferably, the CFI for being exclusively used in narrowband UE is also indicated in the downlink subframe and is exclusively used in broadband UE's
The corresponding OFDM symbols of PDCCH.
Preferably, it generates and is exclusively used in the CFI of narrowband UE and further includes：It is exclusively used in narrowband UE's to described using linear block codes
CFI is encoded.
According to the second aspect of the invention, a kind of base station is provided, including：Control format indicator (CFI) generates unit,
Generation is exclusively used in the CFI of narrow-band user equipment (UE), in indicating downlink link subframe be exclusively used in the physical down of narrowband UE
Corresponding at least one orthogonal frequency division multiplexing (OFDM) symbol of link control channel (PDCCH)；Allocation unit, by the downlink
The OFDM symbol different from the PDCCH, primary synchronization signal and secondary synchronization signal of broadband UE is exclusively used in is distributed to specially in link subframe
Physical Control Format Indicator Channel (PCFICH) for narrowband UE；And transmission unit, it is exclusively used in narrowband UE's described
The CFI of narrowband UE is exclusively used in described in being sent in PCFICH.
Preferably, the allocation unit be configured as the 4th in first time slot by the downlink subframe or
5th OFDM symbol distributes to the PCFICH for being exclusively used in narrowband UE.
The case where being equal to 1.4MHz preferably for the narrowband UE bandwidth supported：When the value of CFI instructions is 1,2 or 3
When, the PDCCH for being exclusively used in narrowband UE corresponds respectively to 2,3 or 4 OFDM in first time slot of the downlink subframe
Symbol；And when the value of CFI instructions is 4, the PDCCH for being exclusively used in narrowband UE corresponds to first of the downlink subframe
2 OFDM symbols in time slot, at least one of this 2 OFDM symbols be different from when the value that CFI indicate be 1 when be exclusively used in
At least one of corresponding 2 OFDM symbols of PDCCH of narrowband UE；Or the UE bands supported in narrowband are wider than
1.4MHz the case where：When the value of CFI instructions is 1,2 or 3, the PDCCH for being exclusively used in narrowband UE corresponds respectively to the downlink chain
1,2 or 3 OFDM symbol in first time slot of way frame；And when the value of CFI instructions is 4, it is exclusively used in narrowband UE's
PDCCH corresponds to 2 OFDM symbols in first time slot of the downlink subframe, in this 2 OFDM symbols at least
One is different from when the value that CFI indicate is 2 in corresponding with the PDCCH for being exclusively used in narrowband UE 2 OFDM symbols at least
One.
Preferably, the CFI for being exclusively used in narrowband UE is also indicated in the downlink subframe and is exclusively used in broadband UE's
The corresponding OFDM symbols of PDCCH.
Preferably, the CFI generates unit and is additionally configured to：It is exclusively used in narrowband UE's to described using linear block codes
CFI is encoded.
According to the third aspect of the invention we, a kind of down link control information method of reseptance is provided, including：Receive downlink
Link subframe, and in the downlink subframe and be exclusively used in the physical downlink control channel (PDCCH) of broadband UE, lead
Detection is exclusively used in narrow-band user equipment (UE) in the synchronizing signal orthogonal frequency division multiplexing different with secondary synchronization signal (OFDM) symbol
Physical Control Format Indicator Channel (PCFICH)；Extraction is exclusively used in the control of narrowband UE from the PCFICH for being exclusively used in narrowband UE
Format indicator (CFI)；And the CFI for being exclusively used in narrowband UE is decoded, in the determination downlink subframe
At least one OFDM symbol corresponding with the PDCCH for being exclusively used in narrowband UE.
Preferably, described detect includes：The 4th in first time slot of the downlink subframe or the 5th
The PCFICH of narrowband UE is exclusively used in OFDM symbol described in detection.
The case where being equal to 1.4MHz preferably for the narrowband UE bandwidth supported：When the value of CFI instructions is 1,2 or 3
When, the PDCCH for being exclusively used in narrowband UE corresponds respectively to 2,3 or 4 OFDM in first time slot of the downlink subframe
Symbol；And when the value of CFI instructions is 4, the PDCCH for being exclusively used in narrowband UE corresponds to first of the downlink subframe
2 OFDM symbols in time slot, at least one of this 2 OFDM symbols be different from when the value that CFI indicate be 1 when be exclusively used in
At least one of corresponding 2 OFDM symbols of PDCCH of narrowband UE；Or the UE bands supported in narrowband are wider than
1.4MHz the case where：When the value of CFI instructions is 1,2 or 3, the PDCCH for being exclusively used in narrowband UE corresponds respectively to the downlink chain
1,2 or 3 OFDM symbol in first time slot of way frame；And when the value of CFI instructions is 4, it is exclusively used in narrowband UE's
PDCCH corresponds to 2 OFDM symbols in first time slot of the downlink subframe, in this 2 OFDM symbols at least
One is different from when the value that CFI indicate is 2 in corresponding with the PDCCH for being exclusively used in narrowband UE 2 OFDM symbols at least
One.
Preferably, the CFI for being exclusively used in narrowband UE is also indicated in the downlink subframe and is exclusively used in broadband UE's
The corresponding OFDM symbols of PDCCH.
Preferably, to the CFI for being exclusively used in narrowband UE be decoded including：Using linear block codes narrowband is exclusively used in described
The CFI of UE is decoded.
According to the fourth aspect of the invention, a kind of narrow-band user equipment (UE) is provided, including：Reception and detection unit,
Receive downlink subframe, and in the downlink subframe be exclusively used in the physical downlink control channel of broadband UE
(PDCCH), detection is exclusively used in narrowband use in the primary synchronization signal orthogonal frequency division multiplexing different with secondary synchronization signal (OFDM) symbol
The Physical Control Format Indicator Channel (PCFICH) of family equipment (UE)；Extraction unit is carried from the PCFICH for being exclusively used in narrowband UE
Take the control format indicator (CFI) for being exclusively used in narrowband UE；And decoding unit, the CFI for being exclusively used in narrowband UE is carried out
Decoding, at least one OFDM symbol corresponding with the PDCCH for being exclusively used in narrowband UE in the determination downlink subframe.
Preferably, the reception and detection unit are configured as：In first time slot of the downlink subframe
The PCFICH of narrowband UE is exclusively used in 4th or the 5th OFDM symbol described in detection.
The case where being equal to 1.4MHz preferably for the narrowband UE bandwidth supported：When the value of CFI instructions is 1,2 or 3
When, the PDCCH for being exclusively used in narrowband UE corresponds respectively to 2,3 or 4 OFDM in first time slot of the downlink subframe
Symbol；And when the value of CFI instructions is 4, the PDCCH for being exclusively used in narrowband UE corresponds to first of the downlink subframe
2 OFDM symbols in time slot, at least one of this 2 OFDM symbols be different from when the value that CFI indicate be 1 when be exclusively used in
At least one of corresponding 2 OFDM symbols of PDCCH of narrowband UE；Or the UE bands supported in narrowband are wider than
1.4MHz the case where：When the value of CFI instructions is 1,2 or 3, the PDCCH for being exclusively used in narrowband UE corresponds respectively to the downlink chain
1,2 or 3 OFDM symbol in first time slot of way frame；And when the value of CFI instructions is 4, it is exclusively used in narrowband UE's
PDCCH corresponds to 2 OFDM symbols in first time slot of the downlink subframe, in this 2 OFDM symbols at least
One is different from when the value that CFI indicate is 2 in corresponding with the PDCCH for being exclusively used in narrowband UE 2 OFDM symbols at least
One.
Preferably, the CFI for being exclusively used in narrowband UE is also indicated in the downlink subframe and is exclusively used in broadband UE's
The corresponding OFDM symbols of PDCCH.
Preferably, the decoding unit is configured as：The CFI for being exclusively used in narrowband UE is carried out using linear block codes
Decoding.
Description of the drawings
By the detailed description of the present invention embodiment below in conjunction with attached drawing, above and other feature of the invention will more
Clearly, wherein：
Fig. 1 (a) shows conventional cyclic prefix (CP, Cyclic in existing LTE system (Rel-8/9/10) downlink
Prefix) the frequency division duplex under pattern (FDD, Frequency Division Duplexing) wireless frame structure (i.e. Frame
Structure 1)。
Fig. 1 (b) shows the example side of the DL control information configurations of existing LTE system (Rel-8/9/10) middle width strip UE
Case.
Fig. 2 shows the channel codings for being used for control format indicator (CFI, Control Format Indicator)
Schematic diagram.
Fig. 3 shows the block diagram of base station according to the ... of the embodiment of the present invention.
Fig. 4 shows the block diagram of narrowband UE according to the ... of the embodiment of the present invention.
Fig. 5 (a) is shown according to embodiments of the present invention, for configuring narrowband UE's (support maximum DL bandwidth is 1.4MHz)
DL controls an exemplary scenario of information.
Fig. 5 (b) show according to embodiments of the present invention, for configure narrowband UE (support maximum DL bandwidth for 3MHz or
One exemplary scenario of DL control information 5MHz).
Fig. 6 (a) shows the value of CFI and is exclusively used in the time domain length n of the PDCCH of narrowband UE and used OFDM symbol
Between a kind of configuration mode.
Fig. 6 (b) show CFI value and be exclusively used in narrowband UE PDCCH time domain lengths n and used OFDM symbol it
Between another configuration mode.
Fig. 7 (a) is shown according to embodiments of the present invention, for configuring narrowband UE's (support maximum DL bandwidth is 1.4MHz)
DL controls another exemplary scenario of information.
Fig. 7 (b) is shown according to embodiments of the present invention, (supports that maximum DL bandwidth is for configuring narrow band subscriber terminal
3MHz or 5MHz) DL control information another exemplary scenario.
Fig. 8 shows that the example of the resource impact for the PCFICH for being exclusively used in narrowband UE, wherein PCFICH are located at OFDM symbol #
3。
Fig. 9 shows the flow chart of down link control information sending method according to the ... of the embodiment of the present invention.
Figure 10 shows the flow chart of down link control information method of reseptance according to the ... of the embodiment of the present invention.
Specific implementation mode
Below with reference to the drawings and specific embodiments, letter is controlled to the downlink for narrowband UE proposed by the invention
Breath transmission/method of reseptance, base station and UE are described in detail.The embodiment of the present invention is suitable for 3GPP LTE and its evolution system
In narrowband UE down link control information configuration.It should be noted that the present invention should not be limited to specific implementation described below
Example.In addition, for simplicity a pair detailed description for the known technology not being directly linked with the present invention being omitted, to prevent
The understanding of the present invention causes to obscure.
Hereafter using LTE mobile communication system and its subsequent evolution version as sample application environment, root has been described in detail
According to multiple embodiments of the present invention.It should be noted, however, that the present invention is not limited to following embodiments, and can be applied to more
More others wireless communication systems, such as 4G and 5G cellular communication systems from now on.
Before describing the present invention, with reference first to Fig. 1 (a) and Fig. 1 (b), frequency division duplex (FDD) in LTE system is described
Wireless frame structure.In downlink, the period is that the radio frames of 10ms are made of 10 a length of 1ms subframes, and each subframe includes two
A time slot.Under conventional cyclic prefix (CP, Cyclic Prefix), each time slot by 7 orthogonal frequency division multiplexing (OFDM,
Orthogonal Frequency Division Multiplexing) symbol composition；When using CP is extended, a time slot packet
Containing 6 OFDM symbols.Hereinafter, illustrating the main thought of the present invention with the FDD frame structures of conventional CP.Those skilled in the art can
With, it is realized that the design of the present invention is also applied for extension CP or other frame structures of LTE system.
As shown in Fig. 1 (a), in subframe 0 and subframe 5, primary synchronization signal (PSS) and secondary synchronization signal (SSS) are being always
It is sent on the position 6 physical resource modules (PRB, Physical Resource Block) for bandwidth center of uniting, i.e. PSS/SSS
The bandwidth of occupancy is 1.08MHz.Either routine CP still extends CP patterns, and the time-domain position of PSS/SSS is fixed as 0 He of subframe
Most latter two OFDM symbol of 5 the 1st time slot.Main broadcast channel (PBCH, Primary Broadcast CHannel) is fixed
In preceding 4 OFDM symbols of the 2nd time slot of subframe 0, occupied bandwidth is identical as PSS/SSS, is 6 PRB in centre.Work as base
When configured system bandwidth of standing is more than 1.4MHz, PDCCH region corresponds to preceding 1 to 3 OFDM symbol of each subframe；When being
When regiment commander's width is 1.4MHz, PDCCH region corresponds to preceding 2 to 4 OFDM symbols of each subframe.
Fig. 1 (b) shows under different system bandwidth, configurations of the PDCCH in each subframe.Here, PDCCH region is big
Small (i.e. time domain length or OFDM symbol number) is indicated by PCFICH.PCFICH only carries the system information of 2 bits, Gu
It is scheduled in first OFDM symbol (i.e. #0) of each subframe, is specifically used to the control format information (i.e. CFI) of transmission PDCCH,
To indicate the time domain length n of PDCCH.The time domain length n of PDCCH indicates that PDCCH occupies the preceding n OFDM symbol of a subframe.
The 2 bit system information of PCFICH are carried by the sequence of 4 a length of 16 QPSK symbols, are dispersed in whole system bandwidth.
3GPP LTE standard specifications TS36.212 regulations, CFI can take value as CFI=1,2 or 3.When system bandwidth is 1.4MHz
When, the time domain length nn=CFI+1 of PDCCH；When system bandwidth is more than 1.4MHz, the time domain length of PDCCH is nn=CFI.
Fig. 2 gives the schematic diagram of CFI channel codings.In order to ensure that the high robust of PCFICH, the code word of CFI use
(3,2) linear block codes is encoded, after 10 repetitions, then additional two systems bit (totally 32 bits).Table 1 provides
CFI code words defined in current LTE system (Rel-8/9/10), wherein the configuration format of " CFI=4 " is reserved.
Table 1：The code word design of CFI in existing LTE system
| CFI values | CFI code words<b0, b1..., b31> |
| 1 | <0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1> |
| 2 | <1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0> |
| 3 | <1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1> |
| 4 (reserved) | <0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0> |
LTE system (Rel-8/9/10) and it is not introduced into the concept of narrowband UE at present, therefore, above with respect to Fig. 1 and 2 descriptions
Prior art is designed for LTE routine UE (broadband UE).
Fig. 3 shows the block diagram of base station 100 according to the ... of the embodiment of the present invention.As shown, base station 100 includes：CFI is generated
Unit 110, allocation unit 120 and transmission unit 130.It will be understood by those skilled in the art that base station 100 further includes realizing its function
Other necessary functional units, such as various processors, memory.
CFI generates unit 110 and is configured as generating the CFI for being exclusively used in narrowband UE, in indicating downlink link subframe and specially
The corresponding at least one OFDM symbols of PDCCH for narrowband UE.
Allocation unit 120 be configured as by the downlink subframe be exclusively used in broadband UE PDCCH, it is main it is synchronous letter
Number OFDM symbol different with secondary synchronization signal distributes to the Physical Control Format Indicator Channel (PCFICH) for being exclusively used in narrowband UE.
Transmission unit 130 is configured as being exclusively used in narrowband UE's described in transmission in the PCFICH for being exclusively used in narrowband UE
CFI。
Fig. 4 shows the block diagram of narrowband UE 100 according to the ... of the embodiment of the present invention.As shown, UE 100 includes：It receives
With detection unit 210, extraction unit 220 and decoding unit 230.It will be understood by those skilled in the art that UE 100 further includes realizing
Other functional units necessary to its function, such as various processors, memory.
It receives and detection unit 210 is configured as receiving downlink subframe, and in the downlink subframe and specially
The orthogonal frequency different with secondary synchronization signal for physical downlink control channel (PDCCH), the primary synchronization signal of broadband UE
Detection is exclusively used in the Physical Control Format Indicator Channel (PCFICH) of narrow-band user equipment (UE) in multiplexing (OFDM) symbol.
Extraction unit 220 is configured as the CFI that the extraction from the PCFICH for being exclusively used in narrowband UE is exclusively used in narrowband UE.
Decoding unit 230 is configured as being decoded the CFI for being exclusively used in narrowband UE, with determine in downlink subframe with
It is exclusively used in the corresponding at least one OFDM symbols of PDCCH of narrowband UE.
To carry out the function and operation of the corresponding functional unit of base station 100 and narrowband UE 200 below in conjunction with specific example
It is described in further detail.
Fig. 5 (a) is shown according to embodiments of the present invention, for configuring narrowband UE's (support maximum DL bandwidth is 1.4MHz)
DL controls an exemplary scenario of information.Fig. 5 (b) is shown according to embodiments of the present invention, (is supported maximum for configuring narrowband UE
DL bandwidth be 3MHz or 5MHz) DL control information an exemplary scenario.
As shown in Fig. 5 (a) and Fig. 5 (b), when system bandwidth is more than 1.4MHz, to avoid and being exclusively used in broadband UE's
Maximum time domain length (that is, PDCCH occupies the case where 3 OFDM symbols) overlapping of PDCCH, and with PSS/SSS (that is, in son
In frame 0 and subframe 5, PSS/SSS occupies last 2 OFDM symbols of the 1st time slot) time-domain position overlapping, base station 100 point
OFDM symbol different from PDCCH, PSS and the SSS for being exclusively used in broadband UE in each downlink subframe is distributed with unit 120
To the PCFICH for being exclusively used in narrowband UE.In one embodiment, allocation unit 120 is configured as the first of downlink subframe
The 4th (#3) or the 5th (#4) OFDM symbol in a time slot distribute to the PCFICH for being exclusively used in narrowband UE.Correspondingly, narrowband
The reception of UE 200 and detection unit 210 are configured as：The 4th (#3) in first time slot of downlink subframe or
The PCFICH of narrowband UE is exclusively used in 5 (#4) OFDM symbols described in detection.Preferably, in order to by more resources unit (RE,
Resource Element) distribute to physical down link sharing channel (PDSCH, Physical Downlink Sharing
CHannel) it is used for transmission down link data, allocation unit 120 is by the 4th (# in first time slot of downlink subframe
3) OFDM symbol distributes to the PCFICH for being exclusively used in narrowband UE.Correspondingly, the reception of narrowband UE 200 and detection unit 210 by with
It is set to：It is exclusively used in narrowband UE's described in detection in the 4th (#3) OFDM symbol in first time slot of downlink subframe
PCFICH.Meanwhile for narrowband UE, redefining " CFI=4 " configuration format of current reservations.
In one embodiment, the CFI for being exclusively used in narrowband UE reuses CFI definition in current LTE (Rel-8/9/10).Specifically
The case where ground, the bandwidth supported for narrowband UE is equal to 1.4MHz：When the value of CFI instructions is 1,2 or 3, it is exclusively used in narrowband
The PDCCH of UE corresponds respectively to 2,3 or 4 OFDM symbols in first in the downlink subframe time slot；When CFI refers to
When the value shown is 4, the PDCCH of narrowband UE is exclusively used in corresponding to 2 in first time slot in the downlink subframe
OFDM symbol, at least one of this 2 OFDM symbols are different from when the value that CFI is indicated is 1 and are exclusively used in narrowband UE's
At least one of corresponding 2 OFDM symbols of PDCCH.The case where 1.4MHz is wider than for the narrowband UE bands supported：
When CFI instruction value be 1,2 or 3 when, be exclusively used in narrowband UE PDCCH correspond respectively in the downlink subframe first
1,2 or 3 OFDM symbol in a time slot；When CFI instruction value be 4 when, be exclusively used in narrowband UE PDCCH correspond to it is described under
2 OFDM symbols in first time slot in uplink subframe, at least one of this 2 OFDM symbols are different from working as CFI
The value of instruction at least one of 2 OFDM symbols corresponding with the PDCCH for being exclusively used in narrowband UE when being 2.
Specifically, consider the LTE downlink systems of a support narrowband UE, the maximum downstream chain that wherein narrowband UE is supported
Road bandwidth is 1.4MHz.By taking LTE FDD wireless frame structures as an example (Fig. 1 (a)), reuses LTE (Rel-8/9/10) and be directed to 1.4MHz
The PCFICH design methods of system bandwidth, design specialized is in the PCFICH formats for the narrowband UE for supporting 1.4MHz bandwidth.As showing
Example, the allocation unit 120 of base station 100 distribute to the 4th (#3) OFDM symbol in the 1st time slot of downlink subframe specially
PCFICH for narrowband UE.Here, the PCFICH for being exclusively used in narrowband UE still carries the system information of 2 bits.CFI can be with value
CFI=1,2,3 or 4.Table 2 gives a kind of CFI being exclusively used in narrowband UE and is exclusively used in the OFDM corresponding to the PDCCH of narrowband UE
The configuration (being shown in Table 1) of the existing LTE Rel-8/9/10 of the corresponding code word design reuse of the example arrangement of symbol, wherein CFI.2 institute of table
The configuration shown corresponds to the situation shown in the left sides Fig. 5 (a).In the configuration, the format of " CFI=4 " has been redefined.
Table 2：The CFI configuration examples of narrowband UE (support maximum bandwidth is 1.4MHz)
Table 3 gives another CFI for being exclusively used in narrowband UE and is exclusively used in the OFDM symbol corresponding to the PDCCH of narrowband UE
Example arrangement.Again, as an example, the allocation unit 120 of base station 100 is by the 4th in the 1st time slot of downlink subframe
A (#3) OFDM symbol distributes to the PCFICH for being exclusively used in narrowband UE.What the PCFICH for being exclusively used in narrowband UE still carried 2 bits is
System information.CFI can with value CFI=1,2,3 or 4.The configuration of the existing LTE Rel-8/9/10 of the corresponding code word design reuses of CFI
(being shown in Table 1).Configuration shown in table 3 corresponds to the situation shown in the right sides Fig. 5 (a).In the configuration, it has redefined " CFI=4 "
Format.
Table 3：The CFI configuration examples of narrowband UE (support maximum bandwidth is 1.4MHz)
In an exemplary scene, after narrowband UE bootings, initial cell search is carried out first, by detecting synchronizing signal
PSS/SSS obtains time and frequency domain synchronization.Then, narrowband UE detects cell ID and broadcast channel (BCH, Broadcast
CHannel) antenna configuration reads main broadcast channel (PBCH, Primary Broadcast CHannel), obtains main information mould
Block (MIB, Master Information Block) information.It is narrow during subsequent narrowband UE reads DL and controls information
The PCFICH information carried in the 4th (#3) OFDM symbol in first time slot is read first with UE, by decoding CFI codes
Word obtains CFI values, and according to table 2 or the configuring condition of table 3, narrowband UE knows the time domain length information of its PDCCH.Such as it is narrow
Band UE decodes to obtain " CFI=4 ", then knows that its PDCCH occupies OFDM symbol #3 and #4 according to table 2, and then accord with from corresponding OFDM
PDCCH is read in number, obtains down link control information (DCI, Downlink Control Information).
What needs to be explained here is that being only to be exclusively used in the CFI values of narrowband UE and be exclusively used in narrowband shown in table 2 and table 3
The schematic example of the correspondence between OFDM symbol corresponding to the PDCCH of UE.It will be appreciated by those skilled in the art that this
Invention is not limited to these examples, other correspondences are also possible.In addition, in the example that table 2 and table 3 provide, downlink chain
The 4th (#3) OFDM symbol in 1st time slot of way frame is assigned to the PCFICH for being exclusively used in narrowband UE.Art technology
Personnel are exclusively used in it will be appreciated that being assigned to for the 5th (#4) OFDM symbol in the 1st time slot of downlink subframe
The case where PCFICH of narrowband UE, can similarly design specialized in narrowband UE CFI values and be exclusively used in the PDCCH institutes of narrowband UE
Correspondence between corresponding OFDM symbol.
Fig. 6 (a) shows the value of CFI and is exclusively used in the time domain length n of the PDCCH of narrowband UE and used OFDM symbol
Between a kind of example correspondence.Fig. 6 (b) shows the value of CFI and is exclusively used in PDCCH time domain lengths n and the institute of narrowband UE
Another example correspondence between the OFDM symbol used.
Example shown in Fig. 6 (a) corresponds to the configuration of table 2.As CFI=1, n=2, the PDCCH for being exclusively used in narrowband UE is accounted for
With 2 OFDM symbols, i.e. #2 and #3.As CFI=2, n=3, the PDCCH for being exclusively used in narrowband UE occupies 3 OFDM symbols, i.e. #
1, #2 and #3.As CFI=3, n=4, the PDCCH for being exclusively used in narrowband UE occupies 4 OFDM symbols, i.e. #1, #2, #3 and #4.When
When CFI=4, n=2, the PDCCH for being exclusively used in narrowband UE occupies 2 OFDM symbols, i.e. #3 and #4.
Example shown in Fig. 6 (b) corresponds to the configuration of table 3.As CFI=1, n=2, the PDCCH for being exclusively used in narrowband UE is accounted for
With 2 OFDM symbols, i.e. #3 and #4.As CFI=2, n=3, the PDCCH for being exclusively used in narrowband UE occupies 3 OFDM symbols, i.e. #
1, #2 and #3.As CFI=3, n=4, the PDCCH for being exclusively used in narrowband UE occupies 4 OFDM symbols, i.e. #1, #2, #3 and #4.When
When CFI=4, n=2, the PDCCH for being exclusively used in narrowband UE occupies 2 OFDM symbols, i.e. #2 and #3.
It should be noted that correspondence shown in Fig. 6 (a) and 6 (b) is only example.The invention is not limited thereto.Other correspondences
It is also possible.
The case where band that narrowband UE is supported is wider than 1.4MHz is described below.In this example, consider a support narrowband
The LTE downlink systems of UE, the maximum downlink bandwidth that narrowband UE is supported are 3MHz or 5MHz.Still with LTE FDD without
(see Fig. 1 (a)) for line frame structure, PCFICH format of the design suitable for the UE of 3MHz 5MHz bandwidth.As an example, base
The 4th (#3) OFDM symbol in 1st time slot of downlink subframe is distributed to and is exclusively used in by 100 allocation unit 120 of standing
The PCFICH of narrowband UE.Here, the size for being exclusively used in the PCFICH of narrowband UE is still 2 bits.CFI can with value CFI=1,2,3
Or 4.Table 4 gives a kind of CFI being exclusively used in narrowband UE and the example for being exclusively used in the OFDM symbol corresponding to the PDCCH of narrowband UE
Configuration, the configuration (being shown in Table 1) of the corresponding existing LTERel-8/9/10 of code word design reuse of wherein CFI.Configuration pair shown in table 4
It should be in the situation shown in the left sides Fig. 5 (b).In the configuration, the format of " CFI=4 " has been redefined.
Table 4：The CFI configuration examples of narrowband UE (supporting to be more than 1.4MHz bandwidth)
Table 5 gives another CFI for being exclusively used in narrowband UE and is exclusively used in the OFDM symbol corresponding to the PDCCH of narrowband UE
Example arrangement.Again, as an example, the allocation unit 120 of base station 100 is by the 4th in the 1st time slot of downlink subframe
A (#3) OFDM symbol distributes to the PCFICH for being exclusively used in narrowband UE.The information size for being exclusively used in the PCFICH of narrowband UE is still 2
Bit.CFI can with value CFI=1,2,3 or 4.The configuration of the existing LTE Rel-8/9/10 of the corresponding code word design reuses of CFI
(being shown in Table 1).Configuration shown in table 5 corresponds to the situation shown in the right sides Fig. 5 (b).In the configuration, it has redefined " CFI=4 "
Format.
Table 5：The CFI configuration examples of narrowband UE (supporting to be more than 1.4MHz bandwidth)
It is different from the embodiment that the CFI in the above-mentioned CFI reuse LTE Rel-8/9/10 for being exclusively used in narrowband UE is defined, standby
It selects in embodiment, redefines and be exclusively used in the CFI that the PCFICH channels of narrowband UE are carried so that be exclusively used in the CFI of narrowband UE
Other than OFDM symbol corresponding with the PDCCH for being exclusively used in narrowband UE in indicating downlink link subframe, the downlink is also indicated
OFDM symbol corresponding with the PDCCH for being exclusively used in broadband UE in link subframe.
In the exemplary embodiment, the CFI for being exclusively used in narrowband UE can be indicated：It is exclusively used in the PDCCH time domain lengths of narrowband UE
n1And it is exclusively used in the PDCCH time domain lengths n of broadband UE2。
Specifically, in one example, consider the LTE downlink systems of support narrowband UE.Narrowband UE is supported
The case where 1.4MHz DL bandwidth and narrowband UE support the case where being more than 1.4MHzDL bandwidth, again design specialized in narrowband
The PCFICH formats of UE.The allocation unit 120 of base station 100 can be by the 4th (#3) in the 1st time slot of downlink subframe
Or the 5th (#4) OFDM symbol distributes to the PCFICH for being exclusively used in narrowband UE.In this example, the CFI for being exclusively used in narrowband UE refers to
Show the PDCCH time domain lengths of narrowband UE and broadband UE, wherein being exclusively used in the PDCCH time domain lengths n of narrowband UE1Value range 2
To 4, it is exclusively used in the PDCCH length n of broadband UE2Value range 1 to 3.Therefore, the value of CFI corresponds to n1With n2Combination<
n1, n2>。
In the case that Fig. 7 (a) shows that narrowband UE supports 1.4MHz DL bandwidth, it is exclusively used in the CFI of narrowband UE and is exclusively used in
The specific example of the PDCCH of narrowband UE and the correspondence being exclusively used between the PDCCH of broadband UE.On the left of Fig. 7 (a), downlink
The 4th (#3) OFDM symbol in 1st time slot of link subframe distributes to the PCFICH for being exclusively used in narrowband UE.On the left sides Fig. 7 (a)
In the case of shown in side, CFI indicates n1=2, n2=2, indicate that the PDCCH for being exclusively used in narrowband UE corresponds to OFDM symbol #2 and #3,
The PDCCH for being exclusively used in broadband UE corresponds to OFDM symbol #0 and #1.On the right side of Fig. 7 (a), the 1st time slot of downlink subframe
In the 5th (#4) OFDM symbol distribute to the PCFICH for being exclusively used in narrowband UE.Shown in the right sides Fig. 7 (a), CFI
Indicate n1=2, n2=2, it indicates that the PDCCH for being exclusively used in narrowband UE corresponds to OFDM symbol #3 and #4, is exclusively used in broadband UE's
PDCCH corresponds to OFDM symbol #0 and #1.
Fig. 7 (b) shows that narrowband UE is supported in the case of being more than 1.4MHz DL bandwidth, be exclusively used in the CFI of narrowband UE with specially
The specific example of PDCCH and the correspondence being exclusively used between the PDCCH of broadband UE for narrowband UE.On the left of Fig. 7 (b),
The 4th (#3) OFDM symbol in 1st time slot of downlink subframe distributes to the PCFICH for being exclusively used in narrowband UE.In Fig. 7
(b) in the case of shown in left side, CFI indicates n1=2, n2=2, indicate that the PDCCH for being exclusively used in narrowband UE corresponds to OFDM symbol #2
And #3, the PDCCH for being exclusively used in broadband UE correspond to OFDM symbol #0 and #1.On the right side of Fig. 7 (b), the 1st of downlink subframe
The 5th (#4) OFDM symbol in time slot distributes to the PCFICH for being exclusively used in narrowband UE.Shown in the right sides Fig. 7 (b),
CFI indicates n1=2, n2=2, it indicates that the PDCCH for being exclusively used in narrowband UE corresponds to OFDM symbol #3 and #4, is exclusively used in broadband UE's
PDCCH corresponds to OFDM symbol #0 and #1.
It will be appreciated by the appropriately skilled person that the present invention is not limited to above-mentioned specific correspondences.Indicated by CFI<
nn1, n2>Other correspondences between OFDM symbol are also possible.
Table 6 give it is according to the present invention be exclusively used in narrowband UE CFI configuration, wherein the value of CFI be CFI=1,2 ...,
9.For example, CFI code word sizes can be 40,20 QPSK symbols are still modulated to using QPSK.It is as big as possible in order to obtain
Frequency diversity gain, 20 QPSK symbols corresponding to PCFICH be distributed in 5 discrete resource unit groups (REG,
Resource Element Group) in, to be distributed as uniformly as possible in the bandwidth where the PRB that narrowband UE is supported,
As shown in Fig. 8.
Table 6：It is exclusively used in the CFI configurations of narrowband UE
Corresponding coding and decoding scheme is provided for the CFI formats of above-mentioned redesign according to the present invention.Base station
100 CFI generates unit 110 and is additionally configured to：The CFI for being exclusively used in narrowband UE is encoded using linear block codes.Accordingly
The decoding unit 230 on ground, narrowband UE 200 is configured as：The CFI for being exclusively used in narrowband UE is decoded using linear block codes.
Specifically, CFI code words<b0, b1..., bN-1>(N is code word size) is designed to realize the high robust of PCFICH
Property, i.e., the Hamming distance between code word is as big as possible.Example code word design method is provided in detail below.
In exemplary method, pre-define 9 a length of 40 bits sequence as CFI code words to carry CFI information.
In the case of CFI code word sizes are fixed, CFI code words are designed to realize Hamming distance as big as possible.
The case where in another exemplary method, optimizing the value of CFI, not using " CFI=9 ".It is effective for remaining 8
CFI values carry CFI information using 3 bits, are encoded to the information of this 3 bit.Specifically, in the exemplary method, example
If CFI code word sizes are fixed as 40 bits, selection check code (7,3) encoding scheme is repeated 5 times as shown in table 7,3 letters of suffix
Bit is ceased, last 2 bit mends 0.
Table 7：Check code (7,3) example
For example, taking simplest (4,3) linear block codes, as shown in table 8,3 information bits add 1 bit odd even afterwards
Check bit is repeated 10 times, and constitutes the CFI code words of 40 bits.Then the CFI code words of 40 bits are modulated to 20 QPSK symbols,
It is mapped in 5 REG, as shown in figure 8, being evenly distributed in the bandwidth that narrowband UE is supported.For example, linear using 8 institute of table
The basic unit of 4 bits is mapped to 2 QPSK symbols, is repeated 10 times, re-mapped into 5 REG, mapping mode by block code
See attached drawing 8.
Table 8：(4,3) linear block codes example
Referring to the drawings come describe the present invention transmission/reception down link control information method flow chart.
In being described below, for clarity, describing the side of the present invention in conjunction with the specific embodiment of the above base station 100 and narrowband UE 200
Method.However, it will be appreciated by the appropriately skilled person that illustrating the present invention's in conjunction with the specific functional units of the above base station or UE
Method is used for the purpose of illustrative purpose, in the case where for example carrying out implementation method using computer program, completely without this
The division of functional unit and component, but the method that base station or UE realize the present invention as a whole.With above-mentioned base station 100
All features that description is combined with the embodiment of UE 200 are also applied for following methods embodiment.
Fig. 9 shows the flow chart of down link control information sending method 900 according to the ... of the embodiment of the present invention.Method
900 can be executed by above-mentioned base station 100, and be included the following steps.
In step 910, CFI generates unit 110 and generates the CFI for being exclusively used in narrow-band user equipment (UE), with indicating downlink chain
At least one orthogonal frequency division multiplexing corresponding with physical downlink control channel (PDCCH) of narrowband UE is exclusively used in way frame
With (OFDM) symbol.
In step 920, allocation unit 120 by the downlink subframe with the PDCCH, main synchronous that is exclusively used in broadband UE
The signal OFDM symbol different with secondary synchronization signal distributes to the Physical Control Format Indicator Channel for being exclusively used in narrowband UE
(PCFICH)。
In step 930, transmission unit 130 sent in the PCFICH for being exclusively used in narrowband UE described in be exclusively used in narrowband UE
CFI.
Preferably, in step 920, allocation unit 120 is by the 4th in first time slot of the downlink subframe
Or the 5th OFDM symbol distributes to the PCFICH for being exclusively used in narrowband UE.
The case where being equal to 1.4MHz preferably for the narrowband UE bandwidth supported：When the value of CFI instructions is 1,2 or 3
When, the PDCCH for being exclusively used in narrowband UE corresponds respectively to 2,3 or 4 OFDM in first time slot of the downlink subframe
Symbol；And when the value of CFI instructions is 4, the PDCCH for being exclusively used in narrowband UE corresponds to first of the downlink subframe
2 OFDM symbols in time slot, at least one of this 2 OFDM symbols be different from when the value that CFI indicate be 1 when be exclusively used in
At least one of corresponding 2 OFDM symbols of PDCCH of narrowband UE.1.4MHz is wider than for the narrowband UE bands supported
The case where：When the value of CFI instructions is 1,2 or 3, the PDCCH for being exclusively used in narrowband UE corresponds respectively to the downlink subframe
First time slot in 1,2 or 3 OFDM symbol；And when the value of CFI instructions is 4, it is exclusively used in PDCCH pairs of narrowband UE
2 OFDM symbols in first time slot of downlink subframe described in Ying Yu, at least one of this 2 OFDM symbols difference
At least one of 2 OFDM symbols corresponding with the PDCCH for being exclusively used in narrowband UE when the value indicated as CFI is 2.
Preferably, the CFI for being exclusively used in narrowband UE is also indicated in the downlink subframe and is exclusively used in broadband UE's
The corresponding OFDM symbols of PDCCH.
Preferably, in step 910, CFI generates unit 110 and is exclusively used in narrowband UE's to described using linear block codes
CFI is encoded.
Figure 10 shows the flow chart of down link control information method of reseptance 1000 according to the ... of the embodiment of the present invention.Method
1000 can be executed by above-mentioned narrowband UE 200, and be included the following steps.
In step 1010, receive and detection unit 210 receive downlink subframe, and in the downlink subframe with
It is exclusively used in physical downlink control channel (PDCCH), the primary synchronization signal of broadband the UE orthogonal frequency different with secondary synchronization signal
Divide in multiplexing (OFDM) symbol and detects the Physical Control Format Indicator Channel (PCFICH) for being exclusively used in narrow-band user equipment (UE).
In step 1020, extraction unit 220 extracts the control for being exclusively used in narrowband UE from the PCFICH for being exclusively used in narrowband UE
Format indicator (CFI).
In step 1030, decoding unit 230 is decoded the CFI for being exclusively used in narrowband UE, with the determination downlink
At least one OFDM symbol corresponding with the PDCCH for being exclusively used in narrowband UE in link subframe.
Preferably, the reception and detection unit 210 the 4th in first time slot of the downlink subframe or
The PCFICH of narrowband UE is exclusively used in 5th OFDM symbol described in detection.
The case where being equal to 1.4MHz preferably for the narrowband UE bandwidth supported：When the value of CFI instructions is 1,2 or 3
When, the PDCCH for being exclusively used in narrowband UE corresponds respectively to 2,3 or 4 OFDM in first time slot of the downlink subframe
Symbol；And when the value of CFI instructions is 4, the PDCCH for being exclusively used in narrowband UE corresponds to first of the downlink subframe
2 OFDM symbols in time slot, at least one of this 2 OFDM symbols be different from when the value that CFI indicate be 1 when be exclusively used in
At least one of corresponding 2 OFDM symbols of PDCCH of narrowband UE.1.4MHz is wider than for the narrowband UE bands supported
The case where：When the value of CFI instructions is 1,2 or 3, the PDCCH for being exclusively used in narrowband UE corresponds respectively to the downlink subframe
First time slot in 1,2 or 3 OFDM symbol；And when the value of CFI instructions is 4, it is exclusively used in PDCCH pairs of narrowband UE
2 OFDM symbols in first time slot of downlink subframe described in Ying Yu, at least one of this 2 OFDM symbols difference
At least one of 2 OFDM symbols corresponding with the PDCCH for being exclusively used in narrowband UE when the value indicated as CFI is 2.
Preferably, the CFI for being exclusively used in narrowband UE is also indicated in the downlink subframe and is exclusively used in broadband UE's
The corresponding OFDM symbols of PDCCH.
Preferably, in step 1030, decoding unit 230 is using linear block codes to the CFI for being exclusively used in narrowband UE
It is decoded.
It should be understood that the above embodiment of the present invention can pass through the combination of both software, hardware or software and hardware
To realize.In this application, narrowband UE refer to support maximum downlink bandwidth be less than base station configuration system bandwidth (such as
The 20MHz of LTE system at present) any UE, be not limited solely to MTC UE, can also be other kinds of user terminal, example
Such as the monitoring device of high-speed mobile, what mobile unit, Work robot etc. can be carried out wireless communication with base station or micro-base station
Terminal device.
Although having been combined the preferred embodiment of the present invention above shows that the present invention, those skilled in the art will
It will be appreciated that without departing from the spirit and scope of the present invention, can carry out various modifications, replace and change to the present invention
Become.Therefore, the present invention should not be limited by above-described embodiment, and should be limited by appended claims and its equivalent.
Claims (20)
1. a kind of down link control information sending method executed by base station, including：
Generation is exclusively used in the control format indicator (CFI) of narrow-band user equipment (UE), in indicating downlink link subframe and specially
Corresponding at least one orthogonal frequency division multiplexing (OFDM) symbol of physical downlink control channel (PDCCH) for narrowband UE
Number, wherein the maximum bandwidth that the narrowband UE is supported is less than the system bandwidth of base station configuration；
It will be different from the PDCCH, primary synchronization signal and secondary synchronization signal of broadband UE is exclusively used in the downlink subframe
OFDM symbol distributes to the Physical Control Format Indicator Channel (PCFICH) for being exclusively used in narrowband UE, wherein what the broadband UE was supported
The whole system bandwidth of base station configuration；And
The CFI of narrowband UE is exclusively used in described in being sent in the PCFICH for being exclusively used in narrowband UE.
2. according to the method described in claim 1, wherein, the allocation step includes：By the first of the downlink subframe
The 4th in a time slot or the 5th OFDM symbol distribute to the PCFICH for being exclusively used in narrowband UE.
3. method according to claim 1 or 2, wherein
The case where 1.4MHz is equal to for the narrowband UE bandwidth supported：
When the value of CFI instructions is 1,2 or 3, the PDCCH for being exclusively used in narrowband UE corresponds respectively to the of the downlink subframe
2,3 or 4 OFDM symbols in one time slot；And
When the value of CFI instructions is 4, the PDCCH for being exclusively used in narrowband UE corresponds to first time slot of the downlink subframe
In 2 OFDM symbols, at least one of this 2 OFDM symbols be different from when the value that CFI indicate be 1 when and be exclusively used in narrowband
At least one of corresponding 2 OFDM symbols of PDCCH of UE；
Or
The case where 1.4MHz is wider than for the narrowband UE bands supported：
When the value of CFI instructions is 1,2 or 3, the PDCCH for being exclusively used in narrowband UE corresponds respectively to the of the downlink subframe
1,2 or 3 OFDM symbol in one time slot；And
When the value of CFI instructions is 4, the PDCCH for being exclusively used in narrowband UE corresponds to first time slot of the downlink subframe
In 2 OFDM symbols, at least one of this 2 OFDM symbols be different from when the value that CFI indicate be 2 when and be exclusively used in narrowband
At least one of corresponding 2 OFDM symbols of PDCCH of UE.
4. method according to claim 1 or 2, wherein the CFI for being exclusively used in narrowband UE also indicates the downlink
OFDM symbol corresponding with the PDCCH for being exclusively used in broadband UE in subframe.
5. according to the method described in claim 4, wherein, the CFI that generation is exclusively used in narrowband UE further includes：
The CFI for being exclusively used in narrowband UE is encoded using linear block codes.
6. a kind of base station, including：
Control format indicator (CFI) generates unit, the CFI for being exclusively used in narrow-band user equipment (UE) is generated, with indicating downlink chain
At least one orthogonal frequency division multiplexing corresponding with physical downlink control channel (PDCCH) of narrowband UE is exclusively used in way frame
With (OFDM) symbol, wherein the maximum bandwidth that the narrowband UE is supported is less than the system bandwidth of base station configuration；
Allocation unit, by the downlink subframe be exclusively used in the PDCCH, primary synchronization signal and secondary synchronization signal of broadband UE
Different OFDM symbols distributes to the Physical Control Format Indicator Channel (PCFICH) for being exclusively used in narrowband UE, wherein the broadband UE
The whole system bandwidth of the base station configuration of support；And
Transmission unit is exclusively used in the CFI of narrowband UE in the PCFICH for being exclusively used in narrowband UE described in transmission.
7. base station according to claim 6, wherein the allocation unit is configured as the of the downlink subframe
The 4th in one time slot or the 5th OFDM symbol distribute to the PCFICH for being exclusively used in narrowband UE.
8. the base station described according to claim 6 or 7, wherein
The case where 1.4MHz is equal to for the narrowband UE bandwidth supported：
When the value of CFI instructions is 1,2 or 3, the PDCCH for being exclusively used in narrowband UE corresponds respectively to the of the downlink subframe
2,3 or 4 OFDM symbols in one time slot；And
When the value of CFI instructions is 4, the PDCCH for being exclusively used in narrowband UE corresponds to first time slot of the downlink subframe
In 2 OFDM symbols, at least one of this 2 OFDM symbols be different from when the value that CFI indicate be 1 when and be exclusively used in narrowband
At least one of corresponding 2 OFDM symbols of PDCCH of UE；Or
The case where 1.4MHz is wider than for the narrowband UE bands supported：
When the value of CFI instructions is 1,2 or 3, the PDCCH for being exclusively used in narrowband UE corresponds respectively to the of the downlink subframe
1,2 or 3 OFDM symbol in one time slot；And
When the value of CFI instructions is 4, the PDCCH for being exclusively used in narrowband UE corresponds to first time slot of the downlink subframe
In 2 OFDM symbols, at least one of this 2 OFDM symbols be different from when the value that CFI indicate be 2 when and be exclusively used in narrowband
At least one of corresponding 2 OFDM symbols of PDCCH of UE.
9. the base station described according to claim 6 or 7, wherein the CFI for being exclusively used in narrowband UE also indicates the downlink
OFDM symbol corresponding with the PDCCH for being exclusively used in broadband UE in subframe.
10. base station according to claim 9, wherein the CFI generates unit and is additionally configured to：
The CFI for being exclusively used in narrowband UE is encoded using linear block codes.
11. a kind of down link control information method of reseptance executed by narrow-band user equipment (UE), the narrowband UE are supported
Maximum bandwidth be less than base station configuration system bandwidth, the method includes：
Downlink subframe is received, and is believed with the physical down link control for being exclusively used in broadband UE in the downlink subframe
Detection is exclusively used in narrowband in road (PDCCH), primary synchronization signal orthogonal frequency division multiplexing (OFDM) symbol different with secondary synchronization signal
The Physical Control Format Indicator Channel (PCFICH) of UE, wherein the whole system bandwidth for the base station configuration that the broadband UE is supported；
Extraction is exclusively used in the control format indicator (CFI) of narrowband UE from the PCFICH for being exclusively used in narrowband UE；And
The CFI for being exclusively used in narrowband UE is decoded, in the determination downlink subframe be exclusively used in narrowband UE's
The corresponding at least one OFDM symbols of PDCCH.
12. according to the method for claim 11, wherein the detection includes：At first of the downlink subframe
The PCFICH of narrowband UE is exclusively used in the 4th in time slot or the 5th OFDM symbol described in detection.
13. method according to claim 11 or 12, wherein
The case where 1.4MHz is equal to for the narrowband UE bandwidth supported：
When the value of CFI instructions is 1,2 or 3, the PDCCH for being exclusively used in narrowband UE corresponds respectively to the of the downlink subframe
2,3 or 4 OFDM symbols in one time slot；And
When the value of CFI instructions is 4, the PDCCH for being exclusively used in narrowband UE corresponds to first time slot of the downlink subframe
In 2 OFDM symbols, at least one of this 2 OFDM symbols be different from when the value that CFI indicate be 1 when and be exclusively used in narrowband
At least one of corresponding 2 OFDM symbols of PDCCH of UE；
Or
The case where 1.4MHz is wider than for the narrowband UE bands supported：
When the value of CFI instructions is 1,2 or 3, the PDCCH for being exclusively used in narrowband UE corresponds respectively to the of the downlink subframe
1,2 or 3 OFDM symbol in one time slot；And
When the value of CFI instructions is 4, the PDCCH for being exclusively used in narrowband UE corresponds to first time slot of the downlink subframe
In 2 OFDM symbols, at least one of this 2 OFDM symbols be different from when the value that CFI indicate be 2 when and be exclusively used in narrowband
At least one of corresponding 2 OFDM symbols of PDCCH of UE.
14. method according to claim 11 or 12, wherein the CFI for being exclusively used in narrowband UE also indicates the downlink
OFDM symbol corresponding with the PDCCH for being exclusively used in broadband UE in link subframe.
15. according to the method for claim 14, wherein the CFI to being exclusively used in narrowband UE be decoded including：
The CFI for being exclusively used in narrowband UE is decoded using linear block codes.
16. a kind of narrow-band user equipment (UE), the maximum bandwidth that the narrowband UE is supported is less than the system bandwidth of base station configuration,
The narrowband UE includes：
Receive and detection unit, receive downlink subframe, and in the downlink subframe be exclusively used in the object of broadband UE
Manage downlink control channel (PDCCH), primary synchronization signal orthogonal frequency division multiplexing (OFDM) symbol different with secondary synchronization signal
It is middle to detect the Physical Control Format Indicator Channel (PCFICH) for being exclusively used in narrowband UE, wherein the base station configuration that the broadband UE is supported
Whole system bandwidth；
Extraction unit extracts the control format indicator (CFI) for being exclusively used in narrowband UE from the PCFICH for being exclusively used in narrowband UE；With
And
Decoding unit is decoded the CFI for being exclusively used in narrowband UE, in the determination downlink subframe be exclusively used in
The corresponding at least one OFDM symbols of PDCCH of narrowband UE.
17. narrowband UE according to claim 16, wherein the reception and detection unit are configured as：In the downlink
The PCFICH of narrowband UE is exclusively used in the 4th in first time slot of link subframe or the 5th OFDM symbol described in detection.
18. narrowband UE according to claim 16 or 17, wherein
The case where 1.4MHz is equal to for the narrowband UE bandwidth supported：
When the value of CFI instructions is 1,2 or 3, the PDCCH for being exclusively used in narrowband UE corresponds respectively to the of the downlink subframe
2,3 or 4 OFDM symbols in one time slot；And
When the value of CFI instructions is 4, the PDCCH for being exclusively used in narrowband UE corresponds to first time slot of the downlink subframe
In 2 OFDM symbols, at least one of this 2 OFDM symbols be different from when the value that CFI indicate be 1 when and be exclusively used in narrowband
At least one of corresponding 2 OFDM symbols of PDCCH of UE；Or
The case where 1.4MHz is wider than for the narrowband UE bands supported：
When the value of CFI instructions is 1,2 or 3, the PDCCH for being exclusively used in narrowband UE corresponds respectively to the of the downlink subframe
1,2 or 3 OFDM symbol in one time slot；And
When the value of CFI instructions is 4, the PDCCH for being exclusively used in narrowband UE corresponds to first time slot of the downlink subframe
In 2 OFDM symbols, at least one of this 2 OFDM symbols be different from when the value that CFI indicate be 2 when and be exclusively used in narrowband
At least one of corresponding 2 OFDM symbols of PDCCH of UE.
19. narrowband UE according to claim 16 or 17, wherein the CFI for being exclusively used in narrowband UE also indicate it is described under
OFDM symbol corresponding with the PDCCH for being exclusively used in broadband UE in uplink subframe.
20. narrowband UE according to claim 19, wherein the decoding unit is configured as：
The CFI for being exclusively used in narrowband UE is decoded using linear block codes.
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