CN103684675A - Downlink control message transmitting/receiving method for aiming at narrowband user equipment - Google Patents
Downlink control message transmitting/receiving method for aiming at narrowband user equipment Download PDFInfo
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Abstract
本发明提供了一种下行链路控制信息发送方法，包括：产生专用于窄带用户设备(UE)的控制格式指示符(CFI)，以指示下行链路子帧中与专用于窄带UE的物理下行链路控制信道(PDCCH)相对应的至少一个正交频分复用(OFDM)符号；将所述下行链路子帧中与专用于宽带UE的PDCCH、主同步信号和辅同步信号不同的OFDM符号分配给专用于窄带UE的物理控制格式指示信道(PCFICH)；以及在所述专用于窄带UE的PCFICH中发送所述专用于窄带UE的CFI。本发明还提供了一种下行链路控制信息接收方法、基站和用户设备。
The present invention provides a method for sending downlink control information, including: generating a control format indicator (CFI) dedicated to a narrowband user equipment (UE), to indicate the physical downlink in a downlink subframe and dedicated to a narrowband UE. At least one Orthogonal Frequency Division Multiplexing (OFDM) symbol corresponding to the link control channel (PDCCH); the OFDM symbols in the downlink subframe that are different from the PDCCH dedicated to the broadband UE, the primary synchronization signal and the secondary synchronization signal symbols are allocated to a Physical Control Format Indicator Channel (PCFICH) dedicated to narrowband UEs; and the CFI dedicated to narrowband UEs is transmitted in the PCFICH dedicated to narrowband UEs. The present invention also provides a downlink control information receiving method, base station and user equipment.
Description
Technical field
The present invention relates to wireless communication technology field.More specifically, the present invention relates to down link control information sending/receiving method, base station and the subscriber equipment for narrow-band user equipment.
Background technology
Wireless communication system in Modern Significance is started in the radiotelegraphic successfully realization of Gualielmo Marconi in 1897.Through the development in a century, radio communication changes a part indispensable in popular life into by high-end consumption, and subscriber equipment terminal also presents diversified trend.Cellular radio Communication system was proposed by Bell laboratory first from nineteen sixty-eight, just, with its mobility and the personalized service characteristic that waits, had adapted to the consumption demand of information age, became the most successful model of commercialization in numerous wireless communication systems.Enter 21 century, (3GPP, the 3 for 3G (Third Generation) Moblie cooperative programme tissue
rdthe Long Term Evolution project (LTE, Long Term Evolution) of Generation Partnership Project) disposing, aims to provide day by day diversified future communications service.In order to meet the market demand of following household equipment communication and Internet of Things (IoT in large scale, Internet of Things) dispose, 3GPP determines to introduce machine communication (MTC in LTE and future version thereof, Machine-Type Communication) technology, primary study has cellular communication module, carries out the machine communication of transfer of data by cellular network.
MTC, also referred to as inter-machine communication (M2M, Machine-to-Machine), is a kind of artificial data communication form participating in that do not need.Large-scale MTC subscriber equipment (UE, User Equipment) is disposed, can be for safety, follow the tracks of, pay a bill, the field such as measurement and consumer electronics.The application that MTC is specifically related to comprises video monitoring, supply of material D-chain trace, intelligent electric meter, remote monitoring etc.MTC requires lower power consumption, supports lower message transmission rate and lower mobility.LTE system is mainly the communication service for person to person (H2H, Human-to-Huam) at present.Therefore in order to realize the competitive advantage of MTC service in LTE system and the application prospect of coupling MTC, key link be realize MTC UE in large scale can low cost movement in LTE and evolution system thereof.Meanwhile, need the system optimization work of 3GPP LTE physical layer.
The technical specification TR36.888 that 3GPP releases recommends to adopt and reduces maximum support bandwidth and reduce peak rate as the main solution that reduces MTC cost, and advise that LTE system is at existing UE (note: in describing in the present invention and below, in current LTE system version 10 (Rel-10), already present UE is called " conventional UE " or " broadband UE ", broadband UE can support the whole system bandwidth of base station configuration, and there is 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz, these 6 kinds of bandwidth mode of 20MHz) on basis, introduce again the user device type (being denoted as MTC UE) of a kind of special applicable MTC.Research shows, in current LTE system, the maximum bandwidth that UE is supported is down to less bandwidth (as 1.4MHz, 3MHz or 5MHz) from 20MHz, can realize the most significant cost effect.RAN56 meeting based on up-to-date (, hold the 56th plenary session of 3GPP technical specification group wireless access network in June, 2012) decision-making, MTC UE for new introduction, by the maximum downlink (DL supporting, DownLink) bandwidth is down to 1.4MHz, and to limit transmission block size (TBS, Transmission Block Size) be that 1000 bits are to realize the reduction of peak rate.DL bandwidth 3MHz and 5MHz are as alternative, in order to improve the performance degradation of MTC covering aspect in addition.
The control information of LTE down link, comprises Physical Control Format Indicator Channel at present
(PCFICH, Physical Control Format Indicator CHannel), physical mixed HARQ (HARQ, Hybrid Automatic Repeat reQuest) indicating channel (PHICH, Physical HARQ Indicator CHannel) and physical downlink control channel (PDCCH, the Physical Downlink Control CHannel) information of carrying.These three kinds of control channels are all to adopt time division multiplexing (TDM, Time-Domain Multiplexing) form to be configured in whole system bandwidth.PCFICH and PHICH are distributed in the 1st OFDM symbol of control area, and PDCCH all has distribution in DL control area.The maximum bandwidth of supporting due to arrowband MTC UE is less than the system bandwidth (for example 20MHz) that current base station configures, and DL control information is at present to transmit in whole system bandwidth, therefore the MTC UE of arrowband cannot read DL control information (because system bandwidth is greater than the maximum bandwidth that MTC UE supports), as
PCFICH/PHICH/PDCCH。In order to realize MTC UE, read DL control information, a kind of the simplest method is, is a kind of novel wireless frame structure of MTC UE design specially, and wherein the DL control information on PCFICH/PHICH/PDCCH all will send in the bandwidth of supporting at MTC UE.But this method can not realize backwards compatibility, broadband UE cannot access the newly-designed frame structure of this class.According to the requirement of 3GPP technical specification group, LTE evolution system must can backward compatibility before the subscriber equipment of version.Therefore, the method for a kind of frame structure of above-mentioned specialized designs does not meet the requirement of backward compatibility.
Another kind method is the new control information allocation plan of design, when supporting that low-cost arrowband MTCUE works in existing LTE system, must take into account the operation of broadband UE.Current already present backwards compatibility solution is mainly divided into two large types.The 1st type is the DL control information that configures to greatest extent MTC UE, and the 2nd type is the DL control area that retains to greatest extent LTE broadband UE.
Particularly, list of references 1 (R1-122804, Additional comments on cost evaluation for MTC, 3GPP TSG RAN WG1 #69, Qualcomm Inc., May2012) represent the 1st type, propose: in supporting the LTE subframe of MTC operation, by the 1st OFDM symbol supporting the PDCCH region limits of LTE broadband UE at the 1st time slot, support the PDCCH region of MTC from the 2nd OFDM sign-on configuration.List of references 2 (R1-120799, Backwards compatible support for reduced bandwidth LTE UEs, 3GPP TSG RAN WG1 #68, IPWireless Inc., February 2012) represent the 2nd type, propose: in supporting the subframe of MTC operation, front 3 OFDM symbols of reserved the 1st time slot, as the PDCCH region of LTE broadband UE, are that the PDCCH region of MTC configuration is since the 4th OFDM.
The 1st kind of DL control information allocation plan that the list of references 1 of take is representative, because its PDCCH configuring for LTE broadband UE only takies 1 OFDM symbol, therefore this scheme supports the number of broadband UE can be less than the allocation plan of existing LTE, cause part broadband UE to can not get scheduling.On the other hand, the 2nd class allocation plan that the list of references 2 of take is representative, in subframe 0 and subframe 5, if length of field surpasses 2 OFDM symbols during the PDCCH that MTC UE configures, can cause and the master sync signal (PSS that is positioned at the 1st last 2 the OFDM symbols of time slot, Primary Synchronization Signal) and auxiliary synchronous signals (SSS, Secondary Synchronization Signal) overlaid, cause conflict.In addition, when the PDCCH that configures broadband UE in arbitrary subframe is 1 or 2 OFDM symbols, can cause resource utilization low, because its PDCCH for MTC UE configuration is still from the 4th OFDM sign-on, now will exist 1～2 OFDM symbol between the PDCCH of broadband UE and the PDCCH of MTC UE idle, affect the effective rate of utilization of Resource Unit in subframe (RE, Resource Element).
Therefore need a kind of new DL control information allocation plan, can fully coordinate the PDCCH configuration of UEHe arrowband, LTE broadband UE (including but not limited to MTC UE), to solve at least some in the problem of above-mentioned prior art scheme.
Summary of the invention
The object of the invention is, when considering backwards compatibility, the DL control information collocation method of a kind of permission arrowband UE access band LTE system (Rel-8/9/10) and evolution version thereof is proposed, can realize the configuration of the DL control information of UEHe arrowband, broadband UE, and maximally utilise system resource.In the present invention, " arrowband UE " refers to that supported maximum bandwidth is less than the UE of the system bandwidth of base station configuration.
According to a first aspect of the invention, a kind of down link control information sending method is provided, comprise: produce the control format designator (CFI) that is exclusively used in narrow-band user equipment (UE), with at least one OFDM (OFDM) symbol corresponding with the physical downlink control channel (PDCCH) that is exclusively used in arrowband UE in indicating downlink link subframe; OFDM allocation of symbols different from the PDCCH, master sync signal and the auxiliary synchronous signals that are exclusively used in broadband UE in described downlink subframe is given to the Physical Control Format Indicator Channel (PCFICH) that is exclusively used in arrowband UE; And the CFI that is exclusively used in arrowband UE in the described PCFICH that is exclusively used in arrowband UE described in sending.
Preferably, described allocation step comprises: by the 4th in first time slot of described downlink subframe or the 5th OFDM allocation of symbols to described in be exclusively used in the PCFICH of arrowband UE.
Preferably, the bandwidth of supporting for arrowband UE equals the situation of 1.4MHz: when the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 2,3 or 4 OFDM symbols in first time slot of described downlink subframe; And when the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 1; Or the band of supporting for arrowband UE is wider than the situation of 1.4MHz: when the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 1,2 or 3 OFDM symbol in first time slot of described downlink subframe; And when the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 2.
Preferably, the CFI that is exclusively used in arrowband UE described in also indicates OFDM symbol corresponding with the PDCCH that is exclusively used in broadband UE in described downlink subframe.
Preferably, producing the CFI be exclusively used in arrowband UE also comprises: utilize linear block codes to encode to the described CFI that is exclusively used in arrowband UE.
According to a second aspect of the invention, a kind of base station is provided, comprise: control format designator (CFI) generation unit, generation is exclusively used in the CFI of narrow-band user equipment (UE), with at least one OFDM (OFDM) symbol corresponding with the physical downlink control channel (PDCCH) that is exclusively used in arrowband UE in indicating downlink link subframe; Allocation units, give OFDM allocation of symbols different from the PDCCH, master sync signal and the auxiliary synchronous signals that are exclusively used in broadband UE in described downlink subframe the Physical Control Format Indicator Channel (PCFICH) that is exclusively used in arrowband UE; And transmitting element, described in sending, be exclusively used in the CFI of arrowband UE in the described PCFICH that is exclusively used in arrowband UE.
Preferably, described allocation units be configured to by the 4th in first time slot of described downlink subframe or the 5th OFDM allocation of symbols to described in be exclusively used in the PCFICH of arrowband UE.
Preferably, the bandwidth of supporting for arrowband UE equals the situation of 1.4MHz: when the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 2,3 or 4 OFDM symbols in first time slot of described downlink subframe; And when the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 1; Or the band of supporting for arrowband UE is wider than the situation of 1.4MHz: when the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 1,2 or 3 OFDM symbol in first time slot of described downlink subframe; And when the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 2.
Preferably, the CFI that is exclusively used in arrowband UE described in also indicates OFDM symbol corresponding with the PDCCH that is exclusively used in broadband UE in described downlink subframe.
Preferably, described CFI generation unit is also configured to: utilize linear block codes to encode to the described CFI that is exclusively used in arrowband UE.
According to a third aspect of the invention we, a kind of down link control information method of reseptance is provided, comprise: receiving downlink subframe, and in described downlink subframe, in OFDM (OFDM) symbol different with auxiliary synchronous signals from the physical downlink control channel (PDCCH), the master sync signal that are exclusively used in broadband UE, detect the Physical Control Format Indicator Channel (PCFICH) that is exclusively used in narrow-band user equipment (UE); From be exclusively used in the PCFICH of arrowband UE, extract the control format designator (CFI) that is exclusively used in arrowband UE; And the described CFI that is exclusively used in arrowband UE is decoded, to determine at least one OFDM symbol corresponding with the PDCCH that is exclusively used in arrowband UE in described downlink subframe.
Preferably, described detection comprises: the PCFICH that is exclusively used in arrowband UE described in detecting in first time slot of described downlink subframe the 4th or the 5th OFDM symbol.
Preferably, the bandwidth of supporting for arrowband UE equals the situation of 1.4MHz: when the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 2,3 or 4 OFDM symbols in first time slot of described downlink subframe; And when the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 1; Or the band of supporting for arrowband UE is wider than the situation of 1.4MHz: when the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 1,2 or 3 OFDM symbol in first time slot of described downlink subframe; And when the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 2.
Preferably, the CFI that is exclusively used in arrowband UE described in also indicates OFDM symbol corresponding with the PDCCH that is exclusively used in broadband UE in described downlink subframe.
Preferably, to being exclusively used in the CFI of arrowband UE, decoding and comprise: utilize linear block codes to decode to the described CFI that is exclusively used in arrowband UE.
According to a forth aspect of the invention, a kind of narrow-band user equipment (UE) is provided, comprise: receive and detecting unit, receiving downlink subframe, and in described downlink subframe, in OFDM (OFDM) symbol different with auxiliary synchronous signals from the physical downlink control channel (PDCCH), the master sync signal that are exclusively used in broadband UE, detect the Physical Control Format Indicator Channel (PCFICH) that is exclusively used in narrow-band user equipment (UE); Extraction unit extracts the control format designator (CFI) that is exclusively used in arrowband UE from be exclusively used in the PCFICH of arrowband UE; And decoding unit, the described CFI that is exclusively used in arrowband UE is decoded, to determine at least one OFDM symbol corresponding with the PDCCH that is exclusively used in arrowband UE in described downlink subframe.
Preferably, described reception and detecting unit are configured to: the PCFICH that is exclusively used in arrowband UE described in detecting in first time slot of described downlink subframe the 4th or the 5th OFDM symbol.
Preferably, the bandwidth of supporting for arrowband UE equals the situation of 1.4MHz: when the value of CFI indication is 1,2 or 3 o'clock, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 2,3 or 4 OFDM symbols in first time slot of described downlink subframe; And when the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 1; Or the band of supporting for arrowband UE is wider than the situation of 1.4MHz: when the value of CFI indication is 1,2 or 3 o'clock, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 1,2 or 3 OFDM symbol in first time slot of described downlink subframe; And when the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 2.
Preferably, the CFI that is exclusively used in arrowband UE described in also indicates OFDM symbol corresponding with the PDCCH that is exclusively used in broadband UE in described downlink subframe.
Preferably, described decoding unit is configured to: utilize linear block codes to decode to the described CFI that is exclusively used in arrowband UE.
Accompanying drawing explanation
By detailed description with the accompanying drawing embodiments of the invention below, above-mentioned and further feature of the present invention will be more clear, wherein:
Fig. 1 (a) shows regular circulation prefix (CP in existing LTE system (Rel-8/9/10) down link, Cyclic Prefix) (FDD, the Frequency Division Duplexing) wireless frame structure of the Frequency Division Duplexing (FDD) under pattern (being Frame Structure 1).
Fig. 1 (b) shows the exemplary scenario of the DL control information configuration of broadband UE in existing LTE system (Rel-8/9/10).
Fig. 2 shows the schematic diagram for the chnnel coding of control format designator (CFI, Control Format Indicator).
Fig. 3 shows according to the block diagram of the base station of the embodiment of the present invention.
Fig. 4 shows according to the block diagram of the arrowband UE of the embodiment of the present invention.
Fig. 5 (a) shows according to the embodiment of the present invention, for configuring an exemplary scenario of the DL control information of arrowband UE (supporting that maximum DL bandwidth is 1.4MHz).
Fig. 5 (b) shows according to the embodiment of the present invention, for configuring an exemplary scenario of the DL control information of arrowband UE (supporting that maximum DL bandwidth is 3MHz or 5MHz).
Fig. 6 (a) shows the value of CFI and is exclusively used in time a kind of configuration mode between length of field n and the OFDM symbol that uses of the PDCCH of arrowband UE.
Another kind of configuration mode when Fig. 6 (b) shows the value of CFI and is exclusively used in the PDCCH of arrowband UE between length of field n and the OFDM symbol that uses.
Fig. 7 (a) shows according to the embodiment of the present invention, for configuring the another kind of exemplary scenario of the DL control information of arrowband UE (supporting that maximum DL bandwidth is 1.4MHz).
Fig. 7 (b) shows according to the embodiment of the present invention, for configuring the another kind of exemplary scenario of narrow band subscriber terminal (supporting that maximum DL bandwidth is 3MHz or 5MHz) DL control information.
Fig. 8 shows the example of the resource mapping of the PCFICH that is exclusively used in arrowband UE, and wherein PCFICH is positioned at OFDM symbol # 3.
Fig. 9 shows according to the flow chart of the down link control information sending method of the embodiment of the present invention.
Figure 10 shows according to the flow chart of the down link control information method of reseptance of the embodiment of the present invention.
Embodiment
Below with reference to the drawings and specific embodiments, down link control information sending/receiving method, base station and UE for arrowband UE proposed by the invention are described in detail.Embodiments of the invention are applicable to the down link control information configuration of the arrowband UE in 3GPP LTE and evolution system thereof.It should be noted that the present invention should not be limited to specific embodiment hereinafter described.In addition, for for simplicity, omitted there is no the detailed description of the known technology of direct correlation with the present invention, to prevent that the understanding of the present invention from causing, obscured.
Below using LTE mobile communication system and follow-up evolution version thereof as example application environment, specifically described according to a plurality of embodiment of the present invention.Yet, it is pointed out that and the invention is not restricted to following examples, but applicable to more other wireless communication systems, for example 4G and 5G cellular communication system from now on.
Before describing the present invention, first with reference to Fig. 1 (a) and Fig. 1 (b), the wireless frame structure of Frequency Division Duplexing (FDD) (FDD) in LTE system is described.At down link, the radio frames that the cycle is 10ms is long for 1ms subframe forms by 10, and each subframe comprises two time slots.Under regular circulation prefix (CP, Cyclic Prefix), each time slot is comprised of 7 OFDMs (OFDM, Orthogonal Frequency Division Multiplexing) symbol; When using expansion CP, a time slot comprises 6 OFDM symbols.Below, the FDD frame structure with conventional CP illustrates main thought of the present invention.It will be appreciated by those of skill in the art that design of the present invention is also applicable to expand other frame structures of CP or LTE system.
As shown in Fig. 1 (a), in subframe 0 and subframe 5, master sync signal (PSS) and auxiliary synchronous signals (SSS) are always at 6 physical resource module (PRB at system bandwidth center, Physical Resource Block) on position, send, the bandwidth that PSS/SSS takies is 1.08MHz.Be no matter conventional CP or expansion CP pattern, the time-domain position of PSS/SSS is fixed as latter two OFDM symbol of the 1st time slot of subframe 0 and 5.Main broadcast channel (PBCH, Primary Broadcast CHannel) is fixed on front 4 OFDM symbols of the 2nd time slot of subframe 0, and shared bandwidth is identical with PSS/SSS, is middle 6 PRB.When the system bandwidth configuring when base station is greater than 1.4MHz, PDCCH region is corresponding to front 1 to 3 OFDM symbol of each subframe; When system bandwidth is 1.4MHz, PDCCH region is corresponding to front 2 to 4 OFDM symbols of each subframe.
Fig. 1 (b) shows under different system bandwidth, and PDCCH is in the configuration of each subframe.Here, the size in PDCCH region (instant length of field, or OFDM number of symbols) is indicated by PCFICH.PCFICH only carries the system information of 2 bits, is fixed in first OFDM symbol (being #0) of each subframe, is used for specially transmitting the control format information (being CFI) of PDCCH, to indicate the time length of field n of PDCCH.The time length of field n of PDCCH represents that PDCCH takies front n OFDM symbol of a subframe.The 2 bit system information exchanges of PCFICH cross 4 long be the sequence carrying of 16 QPSK symbols, be dispersed in whole system bandwidth.3GPP LTE standard convention TS36.212 regulation, CFI can value be CFI=1,2 or 3.When system bandwidth is 1.4MHz, the time length of field nn=CFI+1 of PDCCH; When system bandwidth is greater than 1.4MHz, the time length of field of PDCCH is nn=CFI.
Fig. 2 has provided the schematic diagram of CFI chnnel coding.In order to guarantee the high robust of PCFICH, the code word of CFI adopts (3,2) linear block codes to encode, after 10 times are repeated, more additional two systematic bits (totally 32 bits).Table 1 has provided defined CFI code word in current LTE system (Rel-8/9/10), and wherein the configuration format of " CFI=4 " is reserved.
Table 1: the code word of CFI design in existing LTE system
| CFI value | CFI code word <b 0，b 1，...，b 31> |
| 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 (reserving) | <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) is not introduced the concept of arrowband UE at present, and therefore, the above prior art scheme of describing about Fig. 1 and 2 is only for the conventional UE of LTE (broadband UE) design.
Fig. 3 shows according to the block diagram of the base station 100 of the embodiment of the present invention.As shown in the figure, base station 100 comprises: CFI generation unit 110, allocation units 120 and transmitting element 130.It will be understood by those skilled in the art that base station 100 also comprises realizes necessary other functional units of its function, as various processors, memory etc.
CFI generation unit 110 is configured to produce the CFI that is exclusively used in arrowband UE, with at least one OFDM symbol corresponding with the PDCCH that is exclusively used in arrowband UE in indicating downlink link subframe.
Allocation units 120 are configured to OFDM allocation of symbols different from the PDCCH, master sync signal and the auxiliary synchronous signals that are exclusively used in broadband UE in described downlink subframe to the Physical Control Format Indicator Channel (PCFICH) that is exclusively used in arrowband UE.
Described in being configured to send, transmitting element 130 is exclusively used in the CFI of arrowband UE in the described PCFICH that is exclusively used in arrowband UE.
Fig. 4 shows according to the block diagram of the arrowband UE 100 of the embodiment of the present invention.As shown in the figure, UE 100 comprises: receive and detecting unit 210, extraction unit 220 and decoding unit 230.It will be understood by those skilled in the art that UE 100 also comprises realizes necessary other functional units of its function, as various processors, memory etc.
Receive and detecting unit 210 is configured to receiving downlink subframe, and in described downlink subframe in OFDM (OFDM) symbol different with auxiliary synchronous signals from the physical downlink control channel (PDCCH), the master sync signal that are exclusively used in broadband UE detection be exclusively used in the Physical Control Format Indicator Channel (PCFICH) of narrow-band user equipment (UE).
Decoding unit 230 is configured to decode to being exclusively used in the CFI of arrowband UE, to determine at least one OFDM symbol corresponding with the PDCCH that is exclusively used in arrowband UE in downlink subframe.
Below in conjunction with concrete example, function and the operation of the corresponding functional unit of 100He arrowband, base station UE 200 are explained in further detail.
Fig. 5 (a) shows according to the embodiment of the present invention, for configuring an exemplary scenario of the DL control information of arrowband UE (supporting that maximum DL bandwidth is 1.4MHz).Fig. 5 (b) shows according to the embodiment of the present invention, for configuring an exemplary scenario of arrowband UE (supporting that maximum DL bandwidth is 3MHz or 5MHz) DL control information.
As shown in Fig. 5 (a) and Fig. 5 (b), when system bandwidth is greater than 1.4MHz, for avoid and be exclusively used in broadband UE PDCCH maximum time length of field (, PDCCH takies the situation of 3 OFDM symbols) overlapping, and with PSS/SSS (, in subframe 0 and subframe 5, PSS/SSS takies last 2 OFDM symbols of the 1st time slot) time-domain position overlapping, the allocation units 120 of base station 100 are given OFDM allocation of symbols different with SSS from the PDCCH, the PSS that are exclusively used in broadband UE in each downlink subframe the PCFICH be exclusively used in arrowband UE.In one embodiment, allocation units 120 are configured to the 4th (#3) in first time slot of downlink subframe or the 5th (#4) OFDM allocation of symbols to the PCFICH that is exclusively used in arrowband UE.Correspondingly, the reception of arrowband UE 200 and detecting unit 210 are configured to: the PCFICH that is exclusively used in arrowband UE described in detecting in the 4th (#3) in first time slot of downlink subframe or the 5th (#4) OFDM symbol.Preferably, for by more Resource Units (RE, Resource Element) distribute to physical down link sharing channel (PDSCH, Physical Downlink Sharing CHannel), for communicating downlink data, allocation units 120 are given the 4th (#3) OFDM allocation of symbols in first time slot of downlink subframe the PCFICH that is exclusively used in arrowband UE.Correspondingly, the reception of arrowband UE 200 and detecting unit 210 are configured to: the PCFICH that is exclusively used in arrowband UE described in detecting in the 4th (#3) OFDM symbol in first time slot of downlink subframe.Meanwhile, for arrowband UE, redefine current reserved " CFI=4 " configuration format.
In one embodiment, the CFI that is exclusively used in arrowband UE reuses CFI definition in current LTE (Rel-8/9/10).Particularly, the bandwidth of supporting for arrowband UE equals the situation of 1.4MHz: when the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 2,3 or 4 OFDM symbols in first time slot in described downlink subframe; When the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot in described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 1.The band of supporting for arrowband UE is wider than the situation of 1.4MHz: when the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 1,2 or 3 OFDM symbol in first time slot in described downlink subframe; When the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot in described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 2.
Particularly, consider a LTE downlink system of supporting arrowband UE, the maximum downlink bandwidth that wherein arrowband UE supports is 1.4MHz.Take LTE FDD wireless frame structure as example (Fig. 1 (a)), reuse LTE (Rel-8/9/10) for the PCFICH method for designing of 1.4MHz system bandwidth, design specialized is in the PCFICH form of supporting the arrowband UE of 1.4MHz bandwidth.As example, the allocation units 120 of base station 100 are given the 4th (#3) OFDM allocation of symbols in the 1st time slot of downlink subframe the PCFICH that is exclusively used in arrowband UE.Here, be exclusively used in the system information that the PCFICH of arrowband UE still carries 2 bits.CFI can value CFI=1, and 2,3 or 4.Table 2 has provided a kind of CFI and the example arrangement that is exclusively used in the corresponding OFDM symbol of PDCCH of arrowband UE, the configuration (in Table 1) of the existing LTE Rel-8/9/10 of code word design reuse that wherein CFI is corresponding that is exclusively used in arrowband UE.Configuration shown in table 2 is corresponding to the situation shown in Fig. 5 (a) left side.In this configuration, redefined the form of " CFI=4 ".
Table 2: the CFI ios dhcp sample configuration IOS DHCP of arrowband UE (support maximum bandwidth is 1.4MHz)
Table 3 has provided the another kind of CFI and the example arrangement that is exclusively used in the corresponding OFDM symbol of PDCCH of arrowband UE that is exclusively used in arrowband UE.Again, as example, the allocation units 120 of base station 100 are given the 4th (#3) OFDM allocation of symbols in the 1st time slot of downlink subframe the PCFICH that is exclusively used in arrowband UE.Be exclusively used in the system information that the PCFICH of arrowband UE still carries 2 bits.CFI can value CFI=1, and 2,3 or 4.The configuration (in Table 1) of the existing LTE Rel-8/9/10 of code word design reuse that CFI is corresponding.Configuration shown in table 3 is corresponding to the situation shown in Fig. 5 (a) right side.In this configuration, redefined the form of " CFI=4 ".
Table 3: the CFI ios dhcp sample configuration IOS DHCP of arrowband UE (support maximum bandwidth is 1.4MHz)
In an exemplary scene, after arrowband UE start, first carry out initial cell search, by detecting synchronizing signal PSS/SSS, acquisition time and frequency domain are synchronous.Then, arrowband UE detected cells ID and broadcast channel (BCH, Broadcast CHannel) antenna configuration, read main broadcast channel (PBCH, Primary Broadcast CHannel), obtain main information module (MIB, Master Information Block) information.At follow-up arrowband UE, read in the process of DL control information, first arrowband UE reads the PCFICH information of carrying in the 4th (#3) OFDM symbol in first time slot, by decoding CFI code word, obtain CFI value, according to the configuring condition of table 2 or table 3, arrowband UE is known the time domain length information of its PDCCH.For example UE decoding in arrowband obtains " CFI=4 ", according to table 2, knows that its PDCCH takies OFDM symbol # 3 and #4, and then read PDCCH from corresponding OFDM symbol, obtains down link control information (DCI, Downlink Control Information).
Here it should be noted that, shown in table 2 and table 3 is only the schematic example that is exclusively used in the CFI value of arrowband UE and is exclusively used in the corresponding relation between the corresponding OFDM symbol of PDCCH of arrowband UE.It will be appreciated by those skilled in the art that and the invention is not restricted to these examples, other corresponding relations are also possible.In addition,, in the example that table 2 and table 3 provide, the 4th (#3) OFDM symbol in the 1st time slot of downlink subframe is assigned to the PCFICH that is exclusively used in arrowband UE.Those skilled in the art can recognize, for the 5th (#4) OFDM symbol in the 1st time slot of downlink subframe, be assigned to the situation of the PCFICH that is exclusively used in arrowband UE, design specialized is in the CFI of arrowband UE value and be exclusively used in the corresponding relation between the corresponding OFDM symbol of PDCCH of arrowband UE similarly.
Fig. 6 (a) shows the value of CFI and is exclusively used in time a kind of example corresponding relation between length of field n and the OFDM symbol that uses of the PDCCH of arrowband UE.Another kind of example corresponding relation when Fig. 6 (b) shows the value of CFI and is exclusively used in the PDCCH of arrowband UE between length of field n and the OFDM symbol that uses.
Example shown in Fig. 6 (a) is corresponding to the configuration of table 2.When CFI=1, n=2, the PDCCH that is exclusively used in arrowband UE takies 2 OFDM symbols, i.e. #2 and #3.When CFI=2, n=3, the PDCCH that is exclusively used in arrowband UE takies 3 OFDM symbols, i.e. #1, #2 and #3.When CFI=3, n=4, the PDCCH that is exclusively used in arrowband UE takies 4 OFDM symbols, i.e. #1, #2, #3 and #4.When CFI=4, n=2, the PDCCH that is exclusively used in arrowband UE takies 2 OFDM symbols, i.e. #3 and #4.
Example shown in Fig. 6 (b) is corresponding to the configuration of table 3.When CFI=1, n=2, the PDCCH that is exclusively used in arrowband UE takies 2 OFDM symbols, i.e. #3 and #4.When CFI=2, n=3, the PDCCH that is exclusively used in arrowband UE takies 3 OFDM symbols, i.e. #1, #2 and #3.When CFI=3, n=4, the PDCCH that is exclusively used in arrowband UE takies 4 OFDM symbols, i.e. #1, #2, #3 and #4.When CFI=4, n=2, the PDCCH that is exclusively used in arrowband UE takies 2 OFDM symbols, i.e. #2 and #3.
It should be noted that the corresponding relation shown in Fig. 6 (a) and 6 (b) is only example.The invention is not restricted to this.Other corresponding relations are also possible.
The situation that band that arrowband UE supports is wider than 1.4MHz is below described.In example, consider a LTE downlink system of supporting arrowband UE, the maximum downlink bandwidth that arrowband UE supports is 3MHz or 5MHz.Still take LTE FDD wireless frame structure as example (seeing Fig. 1 (a)), and design is applicable to the PCFICH form of the UE of 3MHz or 5MHz bandwidth.As example, the allocation units 120 of base station 100 are given the 4th (#3) OFDM allocation of symbols in the 1st time slot of downlink subframe the PCFICH that is exclusively used in arrowband UE.Here, the size that is exclusively used in the PCFICH of arrowband UE is still 2 bits.CFI can value CFI=1, and 2,3 or 4.Table 4 has provided a kind of CFI and the example arrangement that is exclusively used in the corresponding OFDM symbol of PDCCH of arrowband UE, the configuration (in Table 1) of the existing LTERel-8/9/10 of code word design reuse that wherein CFI is corresponding that is exclusively used in arrowband UE.Configuration shown in table 4 is corresponding to the situation shown in Fig. 5 (b) left side.In this configuration, redefined the form of " CFI=4 ".
Table 4: the CFI ios dhcp sample configuration IOS DHCP of arrowband UE (support is greater than 1.4MHz bandwidth)
Table 5 has provided the another kind of CFI and the example arrangement that is exclusively used in the corresponding OFDM symbol of PDCCH of arrowband UE that is exclusively used in arrowband UE.Again, as example, the allocation units 120 of base station 100 are given the 4th (#3) OFDM allocation of symbols in the 1st time slot of downlink subframe the PCFICH that is exclusively used in arrowband UE.The information size that is exclusively used in the PCFICH of arrowband UE is still 2 bits.CFI can value CFI=1, and 2,3 or 4.The configuration (in Table 1) of the existing LTE Rel-8/9/10 of code word design reuse that CFI is corresponding.Configuration shown in table 5 is corresponding to the situation shown in Fig. 5 (b) right side.In this configuration, redefined the form of " CFI=4 ".
Table 5: the CFI ios dhcp sample configuration IOS DHCP of arrowband UE (support is greater than 1.4MHz bandwidth)
The embodiment that reuses the CFI definition in LTE Rel-8/9/10 from the above-mentioned CFI that is exclusively used in arrowband UE is different, in alternative, redefine and be exclusively used in the CFI that the PCFICH channel of arrowband UE carries, the CFI that makes to be exclusively used in arrowband UE the OFDM symbol corresponding with the PDCCH that is exclusively used in arrowband UE, also indicates OFDM symbol corresponding with the PDCCH that is exclusively used in broadband UE in this downlink subframe in indicating downlink link subframe.
In example embodiment, the CFI that is exclusively used in arrowband UE can indicate: length of field n while being exclusively used in the PDCCH of arrowband UE
1and length of field n while being exclusively used in the PDCCH of broadband UE
2.
Particularly, in one example, consider to support the LTE downlink system of arrowband UE.For arrowband UE, support the situation of 1.4MHz DL bandwidth and the situation that arrowband UE supports to be greater than 1.4MHzDL bandwidth, all again design specialized in the PCFICH of arrowband UE form.The allocation units 120 of base station 100 can be given the PCFICH that is exclusively used in arrowband UE by the 4th (#3) in the 1st time slot of downlink subframe or the 5th (#4) OFDM allocation of symbols.In this example, length of field while being exclusively used in the PDCCH of CFI indication UEHe broadband, arrowband UE of arrowband UE, length of field n while being wherein exclusively used in the PDCCH of arrowband UE
1span 2 to 4, be exclusively used in the PDCCH length n of broadband UE
2span 1 to 3.Therefore, the value of CFI is corresponding to n
1with n
2combination <n
1, n
2>.
Fig. 7 (a) shows in the situation that arrowband UE supports 1.4MHz DL bandwidth, is exclusively used in the CFI of arrowband UE and is exclusively used in the PDCCH of arrowband UE and is exclusively used in the concrete example of the corresponding relation between the PDCCH of broadband UE.In Fig. 7 (a) left side, the 4th (#3) OFDM allocation of symbols in the 1st time slot of downlink subframe given the PCFICH that is exclusively used in arrowband UE.The in the situation that of shown on the left of Fig. 7 (a), CFI indicates n
1=2, n
2=2, represent that the PDCCH that is exclusively used in arrowband UE, corresponding to OFDM symbol #2 and #3, is exclusively used in the PDCCH of broadband UE corresponding to OFDM symbol #0 and #1.On Fig. 7 (a) right side, the 5th (#4) OFDM allocation of symbols in the 1st time slot of downlink subframe given the PCFICH that is exclusively used in arrowband UE.Shown in Fig. 7 (a) right side in the situation that, CFI indicates n
1=2, n
2=2, represent that the PDCCH that is exclusively used in arrowband UE, corresponding to OFDM symbol #3 and #4, is exclusively used in the PDCCH of broadband UE corresponding to OFDM symbol #0 and #1.
Fig. 7 (b) shows arrowband UE and supports to be greater than in the situation of 1.4MHz DL bandwidth, is exclusively used in the CFI of arrowband UE and is exclusively used in the PDCCH of arrowband UE and is exclusively used in the concrete example of the corresponding relation between the PDCCH of broadband UE.In Fig. 7 (b) left side, the 4th (#3) OFDM allocation of symbols in the 1st time slot of downlink subframe given the PCFICH that is exclusively used in arrowband UE.The in the situation that of shown on the left of Fig. 7 (b), CFI indicates n
1=2, n
2=2, represent that the PDCCH that is exclusively used in arrowband UE, corresponding to OFDM symbol #2 and #3, is exclusively used in the PDCCH of broadband UE corresponding to OFDM symbol #0 and #1.On Fig. 7 (b) right side, the 5th (#4) OFDM allocation of symbols in the 1st time slot of downlink subframe given the PCFICH that is exclusively used in arrowband UE.Shown in Fig. 7 (b) right side in the situation that, CFI indicates n
1=2, n
2=2, represent that the PDCCH that is exclusively used in arrowband UE, corresponding to OFDM symbol #3 and #4, is exclusively used in the PDCCH of broadband UE corresponding to OFDM symbol #0 and #1.
One skilled in the art will recognize that and the invention is not restricted to above-mentioned concrete corresponding relation.The <nn that CFI is indicated
1, n
2other corresponding relations between > and OFDM symbol are also possible.
Table 6 has provided the CFI configuration that is exclusively used in arrowband UE according to of the present invention, and wherein the value of CFI is CFI=1, and 2 ..., 9.For example, CFI code word size can be 40, still adopts QPSK to be modulated to 20 QPSK symbols.In order to obtain large as far as possible frequency diversity gain, corresponding 20 the QPSK symbols of PCFICH are distributed in 5 discrete resource unit group (REG, Resource Element Group) in, to be evenly distributed in as far as possible in the bandwidth at the PRB place that arrowband UE supported, as shown in Figure 8.
Table 6: be exclusively used in the CFI configuration of arrowband UE
According to the present invention, for the CFI form of above-mentioned redesign, provide corresponding Code And Decode scheme.The CFI generation unit 110 of base station 100 is also configured to: utilize linear block codes to encode to being exclusively used in the CFI of arrowband UE.Correspondingly, the decoding unit 230 of arrowband UE 200 is configured to: utilize linear block codes to decode to being exclusively used in the CFI of arrowband UE.
Particularly, CFI code word <b
0, b
1..., b
n-1> (N is code word size) is designed to realize the high robust of PCFICH, and the Hamming distance between code word is large as far as possible.Below specifically provide example code word method for designing.
In exemplary method, pre-defined 9 long be the sequence of 40 bits as CFI code word with carrying CFI information.At CFI code word size, fixedly in the situation that, CFI code word is designed to realize large as far as possible Hamming distance.
In another exemplary method, optimize the value of CFI, do not use the situation of " CFI=9 ".For all the other 8 effective CFI values, adopt 3 bit carrying CFI information, the information of this 3 bit is encoded.Particularly, in this exemplary method, for example CFI code word size is fixed as 40 bits, and selection check code (7,3) encoding scheme is as shown in table 7, repeat 5 times, and 3 information bits of suffix, last 2 bits mend 0.
Table 7: check code (7,3) example
For example, take the simplest (4,3) linear block codes, as shown in table 8,3 information bits, after add 1 bit parity position, repeats the CFI code word of formation 40 bits 10 times.Then the CFI code word of 40 bits is modulated to 20 QPSK symbols, is mapped in 5 REG, as shown in Figure 8, be evenly distributed in the bandwidth that arrowband UE supports.For example, use linear block codes shown in table 8, the elementary cell of 4 bits is mapped to 2 QPSK symbols, repeat 10 times, then be mapped in 5 REG, mapping mode is shown in accompanying drawing 8.
Table 8:(4,3) linear block codes example
The flow chart of the method for sending/receiving down link control information of the present invention is described referring to accompanying drawing.In the following description, for clear, in conjunction with the specific embodiment of above base station 100He arrowband UE 200, method of the present invention is described.Yet, those skilled in the art will recognize that, specific functional units in conjunction with above base station or UE illustrates that method of the present invention is only used to illustrative purpose, in the situation that for example carrying out implementation method with computer program, do not need the division of this functional unit and assembly completely, but base station or UE make the as a whole method of the present invention that realizes.The all features described that combine with the embodiment of above-mentioned base station 100 and UE 200 are also applicable to following methods embodiment.
Fig. 9 shows according to the flow chart of the down link control information sending method 900 of the embodiment of the present invention.Method 900 can be carried out by above-mentioned base station 100, and comprises the following steps.
In step 910, CFI generation unit 110 produces the CFI that is exclusively used in narrow-band user equipment (UE), with at least one OFDM (OFDM) symbol corresponding with the physical downlink control channel (PDCCH) that is exclusively used in arrowband UE in indicating downlink link subframe.
In step 920, allocation units 120 are given OFDM allocation of symbols different from the PDCCH, master sync signal and the auxiliary synchronous signals that are exclusively used in broadband UE in described downlink subframe the Physical Control Format Indicator Channel (PCFICH) that is exclusively used in arrowband UE.
In step 930, described in sending in the described PCFICH that is exclusively used in arrowband UE, transmitting element 130 is exclusively used in the CFI of arrowband UE.
Preferably, in step 920, allocation units 120 are exclusively used in the PCFICH of arrowband UE described in the 4th in first time slot of described downlink subframe or the 5th OFDM allocation of symbols are given.
Preferably, the bandwidth of supporting for arrowband UE equals the situation of 1.4MHz: when the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 2,3 or 4 OFDM symbols in first time slot of described downlink subframe; And when the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 1.The band of supporting for arrowband UE is wider than the situation of 1.4MHz: when the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 1,2 or 3 OFDM symbol in first time slot of described downlink subframe; And when the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 2.
Preferably, the CFI that is exclusively used in arrowband UE described in also indicates OFDM symbol corresponding with the PDCCH that is exclusively used in broadband UE in described downlink subframe.
Preferably, in step 910, CFI generation unit 110 utilizes linear block codes to encode to the described CFI that is exclusively used in arrowband UE.
Figure 10 shows according to the flow chart of the down link control information method of reseptance 1000 of the embodiment of the present invention.Method 1000 can be carried out by above-mentioned arrowband UE 200, and comprises the following steps.
In step 1010, receive and detecting unit 210 receiving downlink subframes, and in described downlink subframe in OFDM (OFDM) symbol different with auxiliary synchronous signals from the physical downlink control channel (PDCCH), the master sync signal that are exclusively used in broadband UE detection be exclusively used in the Physical Control Format Indicator Channel (PCFICH) of narrow-band user equipment (UE).
In step 1020, extraction unit 220 extracts the control format designator (CFI) that is exclusively used in arrowband UE from be exclusively used in the PCFICH of arrowband UE.
In step 1030, the CFI that is exclusively used in arrowband UE described in 230 pairs of decoding units decodes, to determine at least one OFDM symbol corresponding with the PDCCH that is exclusively used in arrowband UE in described downlink subframe.
Preferably, be exclusively used in the PCFICH of arrowband UE described in detecting in described reception and detecting unit 210 in first time slot of described downlink subframe the 4th or the 5th OFDM symbol.
Preferably, the bandwidth of supporting for arrowband UE equals the situation of 1.4MHz: when the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 2,3 or 4 OFDM symbols in first time slot of described downlink subframe; And when the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 1.The band of supporting for arrowband UE is wider than the situation of 1.4MHz: when the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 1,2 or 3 OFDM symbol in first time slot of described downlink subframe; And when the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 2.
Preferably, the CFI that is exclusively used in arrowband UE described in also indicates OFDM symbol corresponding with the PDCCH that is exclusively used in broadband UE in described downlink subframe.
Preferably, in step 1030, decoding unit 230 utilizes linear block codes to decode to the described CFI that is exclusively used in arrowband UE.
Should be appreciated that, the above embodiment of the present invention can realize by both combinations of software, hardware or software and hardware.In this application, arrowband UE refers to that the maximum downlink bandwidth of support is less than any UE of the system bandwidth of base station configuration (for example 20MHz of current LTE system), not only be confined to MTC UE, also can be the user terminal of other types, the watch-dog of high-speed mobile for example, mobile unit, Work robot etc. can carry out with base station or micro-base station the terminal equipment of radio communication.
Although below show the present invention in conjunction with the preferred embodiments of the present invention, one skilled in the art will appreciate that without departing from the spirit and scope of the present invention, can carry out various modifications, replacement and change to the present invention.Therefore, the present invention should not limited by above-described embodiment, and should be limited by claims and equivalent thereof.
Claims (20)
1. a down link control information sending method, comprising:
Generation is exclusively used in the control format designator (CFI) of narrow-band user equipment (UE), with at least one OFDM (OFDM) symbol corresponding with the physical downlink control channel (PDCCH) that is exclusively used in arrowband UE in indicating downlink link subframe;
OFDM allocation of symbols different from the PDCCH, master sync signal and the auxiliary synchronous signals that are exclusively used in broadband UE in described downlink subframe is given to the Physical Control Format Indicator Channel (PCFICH) that is exclusively used in arrowband UE; And
Described in sending, be exclusively used in the CFI of arrowband UE in the described PCFICH that is exclusively used in arrowband UE.
2. method according to claim 1, wherein, described allocation step comprises: by the 4th in first time slot of described downlink subframe or the 5th OFDM allocation of symbols to described in be exclusively used in the PCFICH of arrowband UE.
3. method according to claim 1 and 2, wherein,
The bandwidth of supporting for arrowband UE equals the situation of 1.4MHz:
When the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 2,3 or 4 OFDM symbols in first time slot of described downlink subframe; And
When the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 1;
Or
The band of supporting for arrowband UE is wider than the situation of 1.4MHz:
When the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 1,2 or 3 OFDM symbol in first time slot of described downlink subframe; And
When the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 2.
4. method according to claim 1 and 2, wherein, described in be exclusively used in arrowband UE CFI also indicate OFDM symbol corresponding with the PDCCH that is exclusively used in broadband UE in described downlink subframe.
5. method according to claim 4, wherein, produces the CFI that is exclusively used in arrowband UE and also comprises:
Utilize linear block codes to encode to the described CFI that is exclusively used in arrowband UE.
6. a base station, comprising:
Control format designator (CFI) generation unit, generation is exclusively used in the CFI of narrow-band user equipment (UE), with at least one OFDM (OFDM) symbol corresponding with the physical downlink control channel (PDCCH) that is exclusively used in arrowband UE in indicating downlink link subframe;
Allocation units, give OFDM allocation of symbols different from the PDCCH, master sync signal and the auxiliary synchronous signals that are exclusively used in broadband UE in described downlink subframe the Physical Control Format Indicator Channel (PCFICH) that is exclusively used in arrowband UE; And
Transmitting element, is exclusively used in the CFI of arrowband UE in the described PCFICH that is exclusively used in arrowband UE described in sending.
7. base station according to claim 6, wherein, described allocation units be configured to by the 4th in first time slot of described downlink subframe or the 5th OFDM allocation of symbols to described in be exclusively used in the PCFICH of arrowband UE.
8. according to the base station described in claim 6 or 7, wherein,
The bandwidth of supporting for arrowband UE equals the situation of 1.4MHz:
When the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 2,3 or 4 OFDM symbols in first time slot of described downlink subframe; And
When the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 1; Or
The band of supporting for arrowband UE is wider than the situation of 1.4MHz:
When the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 1,2 or 3 OFDM symbol in first time slot of described downlink subframe; And
When the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 2.
9. according to the base station described in claim 6 or 7, wherein, described in be exclusively used in arrowband UE CFI also indicate OFDM symbol corresponding with the PDCCH that is exclusively used in broadband UE in described downlink subframe.
10. base station according to claim 9, wherein, described CFI generation unit is also configured to:
Utilize linear block codes to encode to the described CFI that is exclusively used in arrowband UE.
11. 1 kinds of down link control information method of reseptances, comprising:
Receiving downlink subframe, and in described downlink subframe, in OFDM (OFDM) symbol different with auxiliary synchronous signals from the physical downlink control channel (PDCCH), the master sync signal that are exclusively used in broadband UE, detect the Physical Control Format Indicator Channel (PCFICH) that is exclusively used in narrow-band user equipment (UE);
From be exclusively used in the PCFICH of arrowband UE, extract the control format designator (CFI) that is exclusively used in arrowband UE; And
The described CFI that is exclusively used in arrowband UE is decoded, to determine at least one OFDM symbol corresponding with the PDCCH that is exclusively used in arrowband UE in described downlink subframe.
12. methods according to claim 11, wherein, described detection comprises: the PCFICH that is exclusively used in arrowband UE described in detecting in first time slot of described downlink subframe the 4th or the 5th OFDM symbol.
13. according to the method described in claim 11 or 12, wherein,
The bandwidth of supporting for arrowband UE equals the situation of 1.4MHz:
When the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 2,3 or 4 OFDM symbols in first time slot of described downlink subframe; And
When the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from when the value of CFI indication is 1 and is exclusively used in arrowband UE
Corresponding 2 the OFDM symbols of PDCCH at least one;
Or
The band of supporting for arrowband UE is wider than the situation of 1.4MHz:
When the value of CFI indication is 1,2 or 3, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 1,2 or 3 OFDM symbol in first time slot of described downlink subframe; And
When the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 2.
14. according to the method described in claim 11 or 12, wherein, described in be exclusively used in arrowband UE CFI also indicate OFDM symbol corresponding with the PDCCH that is exclusively used in broadband UE in described downlink subframe.
15. methods according to claim 14, wherein, to being exclusively used in the CFI of arrowband UE, decoding and comprise:
Utilize linear block codes to decode to the described CFI that is exclusively used in arrowband UE.
16. 1 kinds of narrow-band user equipment (UE), comprising:
Receive and detecting unit, receiving downlink subframe, and in described downlink subframe, in OFDM (OFDM) symbol different with auxiliary synchronous signals from the physical downlink control channel (PDCCH), the master sync signal that are exclusively used in broadband UE, detect the Physical Control Format Indicator Channel (PCFICH) that is exclusively used in narrow-band user equipment (UE);
Extraction unit extracts the control format designator (CFI) that is exclusively used in arrowband UE from be exclusively used in the PCFICH of arrowband UE; And
Decoding unit, decodes to the described CFI that is exclusively used in arrowband UE, to determine at least one OFDM symbol corresponding with the PDCCH that is exclusively used in arrowband UE in described downlink subframe.
17. arrowband UE according to claim 16, wherein, described reception and detecting unit are configured to: the PCFICH that is exclusively used in arrowband UE described in detecting in first time slot of described downlink subframe the 4th or the 5th OFDM symbol.
18. according to the arrowband UE described in claim 16 or 17, wherein,
The bandwidth of supporting for arrowband UE equals the situation of 1.4MHz:
When the value of CFI indication is 1,2 or 3 o'clock, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 2,3 or 4 OFDM symbols in first time slot of described downlink subframe; And
When the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 1; Or
The band of supporting for arrowband UE is wider than the situation of 1.4MHz:
When the value of CFI indication is 1,2 or 3 o'clock, the PDCCH that is exclusively used in arrowband UE corresponds respectively to 1,2 or 3 OFDM symbol in first time slot of described downlink subframe; And
When the value of CFI indication is 4, be exclusively used in the PDCCH of arrowband UE corresponding to 2 OFDM symbols in first time slot of described downlink subframe, at least one in these 2 OFDM symbols is different from least one in 2 OFDM symbols corresponding with the PDCCH that is exclusively used in arrowband UE when the value of CFI indication is 2.
19. according to the arrowband UE described in claim 16 or 17, wherein, described in be exclusively used in arrowband UE CFI also indicate OFDM symbol corresponding with the PDCCH that is exclusively used in broadband UE in described downlink subframe.
20. arrowband UE according to claim 19, wherein, described decoding unit is configured to:
Utilize linear block codes to decode to the described CFI that is exclusively used in arrowband UE.
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