CN105577337A

CN105577337A - Downlink signal sending and receiving methods and downlink signal sending and receiving devices

Info

Publication number: CN105577337A
Application number: CN201410555364.6A
Authority: CN
Inventors: 张雯; 夏树强; 戴博; 毕峰
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2014-10-17
Filing date: 2014-10-17
Publication date: 2016-05-11
Also published as: WO2016058444A1

Abstract

The invention provides downlink signal sending and receiving methods and downlink signal sending and receiving devices. The downlink signal sending method comprises that an eNB obtains the positions of a DC subcarrier according to a preset manner and/or a manner indicted by control information; and the eNB sends information to be sent by mapping the information to physical resource. The eNB does not send signals or sends known signals in the DC subcarrier. According to the methods and devices, DC position can be re-defined for narrowband UE.

Description

A kind of sending, receiving method of downstream signal and device

Technical field

The present invention relates to wireless communication field, particularly relate to a kind of sending, receiving method and device of downstream signal.

Background technology

Machine type communication (MachineTypeCommunication, referred to as MTC) user terminal (UserEquipment, be called for short UE), also known as, machine to machine (MachinetoMachine, be called for short M2M) user communication device is the main application form of current Internet of Things.

In recent years, due to Long Term Evolution (Long-TermEvolution, referred to as LTE)/advanced long-term evolution system (Long-TermEvolutionAdvance, referred to as LTE-Advance or LTE-A) spectrum efficiency high, increasing mobile operator selects LTE/LTE-A as the evolution tendency of system of broadband wireless communication.MTC multiple types data service based on LTE/LTE-A also will be more attractive.

The cost affecting MTCUE is mainly Base-Band Processing and radio frequency.And the downlink radio frequency reducing UE receives the very effective mode of one that bandwidth is reduction MTCUE cost.Namely the downlink radio frequency system bandwidth of the maximum support of MTCUE is less than conventional traditional LTE terminal maximum reception bandwidth 20MHz required under single carrier wave.It may be 1.4MHz that the downlink radio frequency of MTCUE receives bandwidth.The UE that all downlink radio frequency reception bandwidth are less than eNB system bandwidth is called arrowband UE herein, is not limited to MTCUE.

In LTE is descending, direct current (DirectCurrent, DC) subcarrier is positioned at the centre frequency position of system bandwidth, only has this DC in full bandwidth.For this arrowband UE, it works in an arrowband of system bandwidth, and when some RB (Resource Block) not at system bandwidth center of the arrowband of its work, the DC position of its DC position and system bandwidth no longer overlaps.

Summary of the invention

The technical problem to be solved in the present invention how to redefine DC position to arrowband UE.

In order to solve the problem, the invention provides a kind of sending method of downstream signal, comprising:

ENB is according to the mode preset, and/or the mode indicated according to control information, obtains the position of direct current DC subcarrier;

Described eNB sends on information MAP to be sent to physical resource; Wherein, on described DC subcarrier, eNB does not send signal or sends known signal.

Alternatively, the position that the described mode according to presetting obtains direct current DC subcarrier comprises:

The position of described DC subcarrier meet the following conditions one or more:

The position of condition one, DC subcarrier is determined according to the cell ID cellID of community;

As the cellIDmod3=0 of community, DC sub-carrier indices k meets kmod3=C, C ∈ { 1,2}; As the cellIDmod3=1 of community, DC sub-carrier indices k meets kmod3=C, C ∈ { 0,2}; As the cellIDmod3=2 of community, DC sub-carrier indices k meets kmod3=C, C ∈ { 0,1};

The reference signal that the position of condition two, DC subcarrier adopts for user terminal UE according to eNB is determined;

If adopt demodulated reference signal DMRS, on the Resource Block RB adopting described DMRS:

When adopting general cyclic prefix normalCP,

If the DMRS port that eNB adopts only comprises port port{7, one or more in 8,11,13}, DC sub-carrier indices k meets kmod12=C, C ∈ { 0,2,3,4,5,7,8,9,10};

If the DMRS port that eNB adopts only comprises port{9, one or more in 10,12,14}, DC sub-carrier indices k meets kmod12=C, C ∈ { 1,2,3,4,6,7,8,9,11};

If the DMRS port that eNB adopts comprises port{7, one or more and port{9 in 8,11,13}, one or more in 10,12,14}, DC sub-carrier indices k meets kmod12=C, C ∈ { 2,3,4,7,8,9};

When adopting extended cyclic prefix extendedCP, DC sub-carrier indices k meets kmod12=C, C ∈ { 0,3,6,9};

If what adopt is UE DRS (Dedicated Reference Signal), on the RB adopting described UE DRS (Dedicated Reference Signal), when adopting normalCP, DC sub-carrier indices k meets kmod12=C, C ∈ { 1,3,5,7,9,11}, when adopting extendedCP, DC sub-carrier indices k meets kmod12=C, C ∈ { 1,4,7,10}.

Alternatively, described DC subcarrier is only present on the symbol at available Physical Downlink Shared Channel PDSCH place.

Alternatively, the position of described DC subcarrier also meets the following conditions:

In the subframe being configured with location reference signals PRS and RB, if adopt be normalCP and Physical Broadcast Channel PBCH adopt transmitting antenna port number be 1 or 2, so DC sub-carrier indices k meets kmod12=C, C ∈ { 2,8}; If adopt be normalCP and PBCH adopt transmitting antenna port number be 4, or adopt be extendedCP and PBCH adopt transmitting antenna port number be 1 or 2, so DC sub-carrier indices k meets kmod12=C, C ∈ { 2,5,8,11}; If adopt be extendedCP and PBCH adopt transmitting antenna port number be 4, so DC sub-carrier indices k meets kmod12=C, C ∈ { 2,4,5,8,10,11}.

Alternatively, the position of described DC subcarrier also meets the following conditions: in the subframe of channel condition information measurement pilot frequency configuration CSI-RS, on the subcarrier of described DC subcarrier outside the subcarrier at CSI-RS place.

Alternatively, the position of described DC subcarrier also meets the following conditions: be the pre-configured arrowband of UE for an eNB, described DC subcarrier is from a nearest subcarrier of the center frequency point of described arrowband, or from the nearest multiple subcarriers of the center frequency point of described arrowband.

Alternatively, the position of described DC subcarrier is:

If eNB is UE, pre-configured arrowband is odd number RB, on the RB that described DC subcarrier is middle in pre-configured arrowband;

If eNB is UE, pre-configured arrowband is even number RB, and on one of them RB of two RB that described DC subcarrier is middle in pre-configured arrowband, the RB at described DC subcarrier place is determined by cellID or reference signal.

Alternatively, the position of described DC subcarrier in described RB is determined by cellID or reference signal.

Alternatively, described eNB is that the pre-configured arrowband of UE aligns with the Resource Block group RBG of system.

Alternatively, to be the pre-configured arrowband of UE be described eNB according to the model split expanded to both sides from system bandwidth center, or according to minimum to the highest or be up to minimum model split from frequency from frequency.

Alternatively, the position that the described mode according to presetting obtains subcarrier comprises:

The RB taken according to the PDSCH of UE of scheduling determines the position of DC subcarrier.

Alternatively, the described RB taken according to the PDSCH of UE of scheduling determines that the method for the position of DC subcarrier is one of following:

Be the position that DC subcarrier determined by the pre-configured arrowband of UE using all RB between RB to the highest RB minimum for the frequency of scheduling as system;

Be some RBs in UE pre-configured arrowband according to the rule preset as an eNB using the RB of scheduling, determine the position of DC subcarrier;

On certain RB of scheduling and be DC subcarrier from the subcarrier in the nearest available subcarrier set in the center of the minimum RB to the highest RB of frequency of scheduling.

Alternatively, the position that the mode indicated according to described control information obtains DC subcarrier comprises:

Comprise absolute location information and the relative position information of DC in the control information; The position of described DC subcarrier is determined according to described absolute location information and relative position information.

Alternatively, also comprise before obtaining the position of direct current DC subcarrier:

The set of predefine available subcarrier;

In the step of the position of described acquisition direct current DC subcarrier, be obtain in described available subcarrier set or its subset;

Available subcarrier in described available subcarrier set meet the following conditions one or more:

Condition one, available subcarrier are determined according to the cell ID cellID of community;

As the cellIDmod3=0 of community, the index k of available subcarrier meets kmod3=C, C ∈ { 1,2}; As the cellIDmod3=1 of community, the index k of available subcarrier meets kmod3=C, C ∈ { 0,2}; As the cellIDmod3=2 of community, the index k of available subcarrier meets kmod3=C, C ∈ { 0,1};

The reference signal that condition two, available subcarrier adopt for UE according to eNB is determined;

If adopt DMRS, on the RB adopting described DMRS:

When adopting normalCP,

If the DMRS port that eNB adopts only comprises port port{7, one or more in 8,11,13}, the index k of available subcarrier meets kmod12=C, C ∈ { 0,2,3,4,5,7,8,9,10};

If the DMRS port that eNB adopts only comprises port{9, one or more in 10,12,14}, the index k of available subcarrier meets kmod12=C, C ∈ { 1,2,3,4,6,7,8,9,11};

If the DMRS port that eNB adopts comprises port{7, one or more and port{9 in 8,11,13}, one or more in 10,12,14}, the index k of available subcarrier meets kmod12=C, C ∈ { 2,3,4,7,8,9};

When adopting extendedCP, the index k of available subcarrier meets kmod12=C, C ∈ { 0,3,6,9};

If what adopt is UE DRS (Dedicated Reference Signal); On the RB adopting described UE DRS (Dedicated Reference Signal), when adopting normalCP, the index k of available subcarrier meets kmod12=C, C ∈ { 1,3,5,7,9,11}, when adopting extendedCP, the index k of available subcarrier meets kmod12=C, C ∈ { Isosorbide-5-Nitrae, 7,10}.

Alternatively, described available subcarrier is only present on the symbol at available Physical Downlink Shared Channel PDSCH place.

Alternatively, described available subcarrier also meets the following conditions:

In the subframe being configured with location reference signals PRS and RB, if adopt be normalCP and Physical Broadcast Channel PBCH adopt transmitting antenna port number be 1 or 2, so the index k of available subcarrier meets kmod12=C, C ∈ { 2,8}; If adopt be normalCP and PBCH adopt transmitting antenna port number be 4, or adopt be extendedCP and PBCH adopt transmitting antenna port number be 1 or 2, so the index k of available subcarrier meets kmod12=C, C ∈ { 2,5,8,11}; If adopt be extendedCP and PBCH adopt transmitting antenna port number be 4, so the index k of available subcarrier meets kmod12=C, C ∈ { 2,4,5,8,10,11}.

Alternatively, described available subcarrier also meets the following conditions: in the subframe of channel condition information measurement pilot frequency configuration CSI-RS, on the subcarrier of described available subcarrier outside the subcarrier at CSI-RS place.

Alternatively, when the RB that described PDSCH takies is included in a pre-configured arrowband, described DC subcarrier is the DC subcarrier of described pre-configured arrowband.

Alternatively, the DC subcarrier that the control channel of arrowband UE is corresponding and DC sub-carrier positions corresponding to the Traffic Channel of described arrowband UE do not overlap.

Alternatively, the position of the described DC subcarrier of neighbor cell is identical.

Alternatively, also comprise after the step of the position of described acquisition DC subcarrier: eNB by the position informing of obtained DC subcarrier to adjacent area eNB.

Alternatively, described eNB comprises information MAP to be sent to physical resource sends:

Described eNB sends on the subcarrier outside information MAP to be sent to described DC subcarrier;

Or the information that described DC subcarrier maps on whole subcarrier, then deletes or replaces rear transmission with known signal by described eNB by information MAP to be sent.

Present invention also offers a kind of method of reseptance of downstream signal, comprising:

User terminal UE is according to the mode preset, and/or the mode indicated according to control information, obtains the position of direct current DC subcarrier;

UE receives downstream signal according to the position of determined described DC subcarrier and carries out demapping.

When adopting general cyclic prefix normalCP,

Alternatively, the position of described DC subcarrier is:

The RB taken according to the PDSCH of this UE determines the position of DC subcarrier.

Alternatively, the described RB taken according to the PDSCH of this UE determines that the method for the position of DC subcarrier is one of following:

The set of predefine available subcarrier;

If adopt DMRS, on the RB adopting described DMRS:

When adopting normalCP,

Alternatively, when described UE is arrowband UE, the DC sub-carrier positions that the Traffic Channel of the DC subcarrier that control channel is corresponding and described UE is corresponding does not overlap.

Alternatively, described UE receives downstream signal according to the position of determined described DC subcarrier and carries out demapping and comprises:

Radio frequency center frequency point is adjusted to the position of described DC subcarrier by described UE, carries out the reception of downstream signal;

When eNB by the subcarrier outside information MAP to be sent to described DC subcarrier time, described UE carries out demapping to the subcarrier outside DC subcarrier described in described downstream signal; When eNB by information MAP to be sent to whole subcarrier time, described UE carries out demapping to subcarrier whole in described downstream signal.

Present invention also offers a kind of dispensing device of downstream signal, be arranged in eNB, comprise:

Acquisition module, for according to the mode preset, and/or, according to the mode of control information instruction, obtain the position of direct current DC subcarrier;

Sending module, for sending on information MAP to be sent to physical resource; Wherein, on described DC subcarrier, do not send signal or send known signal.

Alternatively, the position that described acquisition module obtains subcarrier according to the mode preset refers to:

The position of the determined described DC subcarrier of described acquisition module meet the following conditions one or more:

When adopting general cyclic prefix normalCP,

Alternatively, the position of described DC subcarrier is:

Described acquisition module determines the position of DC subcarrier according to the RB that the PDSCH of the UE of scheduling takies.

Alternatively, according to the RB that the PDSCH of UE of scheduling takies, described acquisition module determines that the mode of the position of DC subcarrier is one of following:

All RB between RB to the highest RB minimum for the frequency of scheduling are the position that DC subcarrier determined by the pre-configured arrowband of UE as system by described acquisition module;

The RB of scheduling is some RB in the pre-configured arrowband of UE according to the rule preset as an eNB by described acquisition module, determines the position of DC subcarrier;

Described acquisition module is on certain RB of scheduling and be DC subcarrier from the subcarrier in the nearest available subcarrier set in the center of the minimum RB to the highest RB of frequency of scheduling.

Alternatively, the position that described acquisition module obtains DC subcarrier according to the mode that described control information indicates refers to:

Described acquisition module comprises absolute location information and the relative position information of DC in the control information; The position of described DC subcarrier is determined according to described absolute location information and relative position information.

Alternatively, described acquisition module obtains the position of direct current DC subcarrier is obtain in predefined available subcarrier set or its subset;

If adopt DMRS, on the RB adopting described DMRS:

When adopting normalCP,

Alternatively, the position of described DC subcarrier that obtains of the described acquisition module of neighbor cell is identical.

Alternatively, described acquisition module also for by the position informing of obtained DC subcarrier to adjacent area eNB.

Alternatively, described sending module refers to information MAP to be sent to physical resource sends:

Described sending module sends on the subcarrier outside information MAP to be sent to described DC subcarrier;

Or the information that described DC subcarrier maps on whole subcarrier, then deletes or replaces rear transmission with known signal by described sending module by information MAP to be sent.

Present invention also offers a kind of receiving system of downstream signal, be arranged in user terminal, comprise:

Receiver module, receives downstream signal for the position according to determined described DC subcarrier and carries out demapping.

Alternatively, the position that described acquisition module obtains subcarrier according to the mode preset comprises:

When adopting general cyclic prefix normalCP,

Alternatively, the position of described DC subcarrier is:

Described acquisition module determines the position of DC subcarrier according to the RB that the PDSCH of this UE takies.

Alternatively, described acquisition module determines that according to the RB that the PDSCH of this UE takies the mode of the position of DC subcarrier is one of following:

Alternatively, when described acquisition module obtains the position of direct current DC subcarrier, be obtain in predefined available subcarrier set or its subset;

If adopt DMRS, on the RB adopting described DMRS:

When adopting normalCP,

Alternatively, described reception receives downstream signal according to the position of determined described DC subcarrier and carries out demapping and refers to:

Radio frequency center frequency point is adjusted to the position of described DC subcarrier by described receiver module, carries out the reception of downstream signal; When eNB by the subcarrier outside information MAP to be sent to described DC subcarrier time, demapping is carried out to the subcarrier outside DC subcarrier described in described downstream signal; When eNB by information MAP to be sent to whole subcarrier time, demapping is carried out to subcarrier whole in described downstream signal.

The present invention is that arrowband UE defines DC position, vacates DC position or sends known signal in DC position, in order to avoid produce interference time eNB (base station) sends data to UE.

Accompanying drawing explanation

Fig. 1 is the schematic flow sheet of the transmission method of downstream signal of the present invention;

Fig. 2 is configuration mode schematic diagram in arrowband in embodiment one;

Fig. 3 is the schematic diagram of the example of a non-MBSFN sub-frame DC position.

The pattern of DMRS is given in Fig. 4.

Fig. 5 is the example of the DC position of a MBSFN sub-frame.

Fig. 6 mono-is about the schematic diagram of non-MBSFN sub-frame DC position.

The example of Fig. 7 to be DC be 300KHz integral multiple.

Fig. 8 is the RB configuration mode figure of arrowband UE in arrowband.

Fig. 9 is the schematic diagram of DC corresponding to the control channel of UE and Traffic Channel.

One is determined DC example according to the RB of scheduling is provided in Figure 10.

The example of Figure 11 to be the indication information in a control information be relative value.

Embodiment

Below in conjunction with drawings and Examples, technical scheme of the present invention is described in detail.

It should be noted that, if do not conflicted, each feature in the embodiment of the present invention and embodiment can be combined with each other, all within protection scope of the present invention.In addition, although show logical order in flow charts, in some cases, can be different from the step shown or described by order execution herein.

A transmission method for downstream signal, as shown in Figure 1, comprising:

ENB is according to the mode preset, and/or the mode indicated according to control information, obtains the position of DC subcarrier;

ENB sends on information MAP to be sent to physical resource; Wherein, on described DC subcarrier, eNB does not send signal or sends known signal.

In execution mode one, the position that the described mode according to presetting obtains subcarrier specifically can comprise:

The position of condition 1:DC subcarrier is determined according to the cellID (cell ID) of community.

As the cellIDmod3=0 of community, DC sub-carrier indices k meets kmod3=C, C ∈ { 1,2}; As the cellIDmod3=1 of community, DC sub-carrier indices k meets kmod3=C, C ∈ { 0,2}; As the cellIDmod3=2 of community, DC sub-carrier indices k meets kmod3=C, C ∈ { 0,1}.

The reference signal that the position of condition 2:DC subcarrier adopts for certain UE according to eNB is determined.

If adopt DMRS (DeModulationReferenceSignal, demodulated reference signal), on the RB adopting described DMRS:

When adopting normalCP (general cyclic prefix),

If the DMRS port that eNB adopts only comprises port{7, one or more in 8,11,13}, DC sub-carrier indices k meets kmod12=C, C ∈ { 0,2,3,4,5,7,8,9,10};

If the DMRS port that eNB adopts comprises port{7, one or more and port{9 in 8,11,13}, one or more in 10,12,14}, DC sub-carrier indices k meets kmod12=C, C ∈ { 2,3,4,7,8,9}.

When adopting extendedCP (extended cyclic prefix), DC sub-carrier indices k meets kmod12=C, C ∈ { 0,3,6,9}.

If that adopt is UE DRS (Dedicated Reference Signal) (port5), on the RB adopting described UE DRS (Dedicated Reference Signal), when adopting normalCP, DC sub-carrier indices k should meet kmod12=C, C ∈ { 1,3,5,7,9,11}, when adopting extendedCP, DC sub-carrier indices k should meet kmod12=C, C ∈ { 1,4,7,10}.

In present embodiment, alternatively, described DC subcarrier be only present in available PDSCH (PhysicalDownlinkSharedChannel, Physical Downlink Shared Channel) place symbol on (condition 3).

In present embodiment, alternatively, the position of described DC subcarrier also should satisfy condition 4: in the subframe being configured with location reference signals PRS and RB, if adopt be normalCP and Physical Broadcast Channel PBCH adopt transmitting antenna port number be 1 or 2, so DC sub-carrier indices k meets kmod12=C, C ∈ { 2,8}; If adopt be normalCP and PBCH adopt transmitting antenna port number be 4, or adopt be extendedCP and PBCH adopt transmitting antenna port number be 1 or 2, so DC sub-carrier indices k meets kmod12=C, C ∈ { 2,5,8,11}; If adopt be extendedCP and PBCH adopt transmitting antenna port number be 4, so DC sub-carrier indices k meets kmod12=C, C ∈ { 2,4,5,8,10,11}.

In present embodiment, alternatively, the position of described DC subcarrier also satisfies condition 5: in the subframe of configuration CSI-RS (channel condition information measurement pilot frequency), on the subcarrier of described DC outside the subcarrier at CSI-RS place.

In present embodiment, alternatively, the position of described DC subcarrier also meets the following conditions: be the pre-configured arrowband of UE for an eNB, described DC subcarrier is from a nearest subcarrier of the center frequency point of described arrowband, or from the nearest multiple subcarriers of the center frequency point of described arrowband.

Correspondingly, the position of described DC subcarrier can be, but not limited to into:

Correspondingly, the described position of DC subcarrier in described RB can be, but not limited to be determined by cellID or reference signal.

Correspondingly, described eNB is that the pre-configured arrowband of UE can be, but not limited to align with the RBG of system (Resource Block group).

In present embodiment, alternatively, described eNB comprises information MAP to be sent to physical resource sends:

Or the information that described DC subcarrier maps on whole subcarrier, then deletes or replaces rear transmission with known signal by described eNB by information MAP to be sent.In execution mode two, the position that the described mode according to presetting obtains subcarrier specifically can comprise:

In present embodiment, alternatively, the described RB taken according to the PDSCH of UE of scheduling determines that the method for DC subcarrier is one of following:

Be the position that DC subcarrier determined by the pre-configured arrowband of UE using all RB between RB to the highest RB minimum for the frequency of scheduling as system; What such as dispatch is RB#0 ~ 11, is so just regarded as RB#0 ~ 11 as the pre-configured arrowband of UE;

In execution mode three, determine that the position of DC subcarrier comprises according to the mode that described control information indicates:

Comprise absolute location information and the relative position information of DC subcarrier in the control information; The position of described DC subcarrier is determined according to described absolute location information and relative position information.

In execution mode two and three, alternatively, before the position obtaining DC subcarrier, can also comprise: preset or t easet ofasubcarriers that predefine one is available, in the step of the position of described acquisition direct current DC subcarrier, be obtain in described available subcarrier set or its subset;

Each available subcarrier in described available subcarrier set is the set of the one or more subcarrier composition met in the condition 1 ~ 5 in execution mode one.

In execution mode two and three, alternatively, when the RB that described PDSCH takies is included in a pre-configured arrowband, DC subcarrier is the DC subcarrier of described pre-configured arrowband.Such as eNB is the arrowband of arrowband UE preset configuration is two: RB#0 ~ 5 and RB#6 ~ 11, and when the RB that the PDSCH dispatching certain arrowband UE takies is RB#4 and 5, so DC subcarrier is exactly the DC subcarrier of RB#0 ~ 5, arrowband.Certainly, when the RB that described PDSCH takies is included in a pre-configured arrowband, the position of DC subcarrier can also be determined according to the mode described in embodiment two, three.

In execution mode four, the DC sub-carrier positions that the Traffic Channel of the DC subcarrier that the control channel of described arrowband UE is corresponding and described UE is corresponding does not overlap.

In execution mode five, the position of the described DC subcarrier of neighbor cell is identical.

In present embodiment, alternatively, also comprise after the step of the position of described acquisition DC subcarrier: eNB by the position informing of obtained DC subcarrier to adjacent area eNB.

A method of reseptance for downstream signal, comprising:

The position that execution mode one, the described mode according to presetting obtain subcarrier comprises:

The position of condition 1, DC subcarrier is determined according to the cell ID cellID of community;

The reference signal that the position of condition 2, DC subcarrier adopts for user terminal UE according to eNB is determined;

When adopting general cyclic prefix normalCP,

In present embodiment, alternatively, described DC subcarrier be only present in available Physical Downlink Shared Channel PDSCH place symbol on (condition 3).

In present embodiment, alternatively, the position of described DC subcarrier also meets the following conditions 4:

In present embodiment, alternatively, the position of described DC subcarrier also meets the following conditions 5: in the subframe of channel condition information measurement pilot frequency configuration CSI-RS, on the subcarrier of described DC subcarrier outside the subcarrier at CSI-RS place.

Further, the position of described DC subcarrier can be:

Further, the position of described DC subcarrier in described RB can be determined by cellID or reference signal.

Further, described eNB is that the pre-configured arrowband of UE can align with the Resource Block group RBG of system.

The position that execution mode two, the described mode according to presetting obtain subcarrier comprises:

In present embodiment, alternatively, state the RB taken according to the PDSCH of this UE and determine that the method for the position of DC subcarrier is one of following:

The position that execution mode three, the mode indicated according to described control information obtain DC subcarrier comprises:

In execution mode two and three, alternatively, also comprise before obtaining the position of direct current DC subcarrier:

The set of predefine available subcarrier;

Available subcarrier in described available subcarrier set meet in above-mentioned condition 1 ~ 5 one or more.

In execution mode two and three, alternatively, when the RB that described PDSCH takies is included in a pre-configured arrowband, described DC subcarrier is the DC subcarrier of described pre-configured arrowband.

When execution mode four, described UE are arrowband UE, the DC sub-carrier positions that the Traffic Channel of the DC subcarrier that control channel is corresponding and described UE is corresponding does not overlap.

Execution mode five, described UE receive downstream signal according to the position of determined described DC subcarrier and carry out demapping and comprise:

In present embodiment, the mapping mode that eNB adopts can be arranged in advance with UE or arrange the mapping mode of acquiescence, also can inform UE or be obtained voluntarily by UE.

A dispensing device for downstream signal, is arranged in eNB, comprises:

The position that execution mode one, described acquisition module obtain subcarrier according to the mode preset refers to:

When adopting general cyclic prefix normalCP,

Further, the position of described DC subcarrier can be:

Further, the described eNB model split that to be the pre-configured arrowband of UE can be according to expanding from system bandwidth center to both sides, or according to minimum to the highest or be up to minimum model split from frequency from frequency.

The position that execution mode two, described acquisition module obtain subcarrier according to the mode preset refers to:

In present embodiment, alternatively, according to the RB that the PDSCH of UE of scheduling takies, described acquisition module determines that the mode of the position of DC subcarrier is one of following:

The position that execution mode three, described acquisition module obtain DC subcarrier according to the mode that described control information indicates refers to:

In execution mode two and three, alternatively, described acquisition module obtains the position of direct current DC subcarrier is obtain in predefined available subcarrier set or its subset;

The DC sub-carrier positions that the Traffic Channel of the DC subcarrier that the control channel of execution mode four, arrowband UE is corresponding and described arrowband UE is corresponding does not overlap.

The position of the described DC subcarrier that the described acquisition module of execution mode five, neighbor cell obtains is identical.

In present embodiment, alternatively, described acquisition module also for by the position informing of obtained DC subcarrier to adjacent area eNB.

Execution mode six, described sending module refers to information MAP to be sent to physical resource sends:

A receiving system for downstream signal, is arranged in user terminal, comprises:

The position that execution mode one, described acquisition module obtain subcarrier according to the mode preset comprises:

When adopting general cyclic prefix normalCP,

Further, the position of described DC subcarrier can be:

In present embodiment, alternatively, described acquisition module determines that according to the RB that the PDSCH of this UE takies the mode of the position of DC subcarrier is one of following:

In execution mode two and three, alternatively, when described acquisition module obtains the position of direct current DC subcarrier, be obtain in predefined available subcarrier set or its subset;

Available subcarrier in described available subcarrier set meet in above-mentioned condition 1 ~ 5 one or more

Execution mode five, described reception receive downstream signal according to the position of determined described DC subcarrier and carry out demapping and refer to:

Illustrate by several embodiment below.

Embodiment one:

For arrowband UE, it works in an arrowband of system bandwidth, and as some RB of the arrowband not heart in systems in which of its work, the DC sub-carrier positions of its DC sub-carrier positions and system bandwidth no longer overlaps.

For arrowband UE redefines the position of DC subcarrier, when sending downstream signal, in the DC sub-carrier positions of new definition, eNB no longer sends signal, or sends known signal, such as pilot tone.

UE due to the reduction of RF (radio frequency) bandwidth can not receive the PDCCH (PhysicalDownlinkControlChannel of full bandwidth, Physical Downlink Control Channel), so for the situation comprising PDCCH in system bandwidth, can not comprise DC subcarrier in the symbol at PDCCH place, namely DC subcarrier exists only on the symbol at available PDSCH region place.

In the present embodiment, the position of DC subcarrier is determined according to the mode preset.The position obtaining DC subcarrier according to the mode preset comprises: the position determining DC subcarrier according to one or more of following condition:

Condition 1:DC sub-carrier positions is determined by the cellID of community.

The reference signal that condition 2:DC sub-carrier positions is adopted for certain UE by eNB is determined.

If adopt DMRS, on the RB adopting described DMRS,

When adopting normalCP,

When adopting extendedCP, DC sub-carrier indices k meets kmod12=C, C ∈ { 0,3,6,9}.

If what adopt is UE DRS (Dedicated Reference Signal), UE DRS (Dedicated Reference Signal) here refers to the reference signal sent on port5.On the RB adopting described UE DRS (Dedicated Reference Signal),

When adopting normalCP, DC sub-carrier indices k should meet kmod12=C, C ∈ 1,3,5,7,9,11},

When adopting extendedCP, DC sub-carrier indices k should meet kmod12=C, C ∈ { Isosorbide-5-Nitrae, 7,10}.

As the position utilizing above-mentioned condition to determine DC subcarrier, the normal transmission of existing cell special reference CRS and/or DMRS and/or UE DRS (Dedicated Reference Signal) can be ensured.

Further, described DC subcarrier is only present on the symbol at available PDSCH place.

Further, if system configuration PRS, so in the subframe being configured with PRS and RB, also should to meet at described DC subcarrier:

If the transmitting antenna port number adopting normalCP and PBCH to adopt is 1 or 2, so DC sub-carrier indices meets kmod12=C, C ∈ { 2,8};

If the transmitting antenna port number adopting normalCP and PBCH to adopt is 4, or adopt extendedCP and the transmitting antenna port number adopted is 1 or 2, so DC sub-carrier indices k meets kmod12=C, C ∈ { 2,5,8,11};

If the transmitting antenna port number adopting extendedCP and PBCH to adopt is 4, so DC sub-carrier indices k meets kmod12=C, C ∈ { 2,4,5,8,10,11}.

Utilize such method, the normal transmission of the PRS configured in the subframe being configured with PRS and RB can be ensured.

Or, in the subframe being configured with PRS and RB, if the position of DC subcarrier and PRS position overlap, then do not send PRS in described position.

Further, if system configuration CSI-RS, so the subframe of CSI-RS is being configured with, on the subcarrier of described DC subcarrier outside the subcarrier at CSI-RS place.Utilize such method, the normal transmission of the CSI-RS in the sub-frame configuration being configured with CSI-RS can be ensured.Or, be configured with the subframe of CSI-RS, if DC subcarrier and CSI-RS position overlap, then do not sending CSI-RS in described position.

Further, be the pre-configured arrowband of UE for an eNB, described DC subcarrier is from a nearest subcarrier of the center frequency point of described arrowband, or from the nearest multiple subcarriers of the center frequency point of described arrowband.Suppose that maximum RB number corresponding to maximum bandwidth that UE supports is N _rB, system is the pre-configured N of UE _rB+ n RB, wherein n is integer.So for N _rB+ n is the situation of even number, on DC subcarrier certain subcarrier on middle two RB; For N _rB+ n is the situation of odd number, and DC subcarrier is on certain subcarrier of middle RB.RB described here is the RB defined in legacy system, and system also may for configure for arrowband UE redefines another kind of RB in arrowband.In addition, described eNB is that the pre-configured arrowband of UE should align with the RBG of system, to avoid producing RB fragment.

Further, described eNB is the pre-configured arrowband of UE, and can be the model split according to expanding from system bandwidth center to both sides, such as 6, center RB be an arrowband, and other arrowbands are the arrowband to both sides expansion respectively, as shown in Figure 2; Or according to minimum to the highest model split from frequency, such as every 6 RB are divided into an arrowband.The division of arrowband also can have overlap.That is a RB can belong to multiple arrowband.When UE receives, can be different with the mode of the arrowband receiving other positions containing the arrowband of the DC in system bandwidth in prior art for receiving package, also can be identical.Such as receive mode is different: suppose that maximum RB number corresponding to system bandwidth that UE supports is 6, receive the signal of 6 × 12+1=73 (comprising the DC subcarrier in system bandwidth) individual subcarrier during the arrowband of then receiving center position, and receive 6 × 12=72 subcarrier (its DC is included among these 6 RB) when receiving the arrowband of other positions.Also can receive mode identical: all receive 73 subcarriers or all receive 72 subcarriers.

Further, DC subcarrier should be positioned on the position of the integral multiple of 300KHz.Further, on an arrowband at described DC subcarrier place, eNB can send synchronizing signal, further, MIB (MasterInformationBlock can be sent on described arrowband, host system message block) and/or SIB (SystemInformationBlock, system information block).Like this, arrowband UE can be made frequency sweep can to find described DC subcarrier, and receive synchronizing signal, MIB and/or SIB on the arrowband at described DC subcarrier place.

Further, the DC sub-carrier positions of neighbor cell can be set to same sub-carrier, in order to avoid neighbor cell transmitted power in the DC sub-carrier positions of this community is excessive, causes interference.

Further, after determining DC sub-carrier positions, DC sub-carrier positions is informed to adjacent area eNB by eNB, to avoid eNB transmitted power in the DC sub-carrier positions of this community in adjacent area excessive, causes interference.

Provide the example of a non-MBSFN sub-frame below, suppose that maximum RB number corresponding to narrow band bandwidth that arrowband UE supports is N _rB, system is the pre-configured arrowband of arrowband UE is N _rBindividual RB, in arrowband according to frequency increase order by N _rBit is 0,1,2 that individual RB renumbers ... N _rB-1, system configuration CSI-RS, and adopt CSI-RS to configure #0, suppose do not have DMRS, PRS in arrowband, system bandwidth is 20M, every N _rBindividual RB is the arrowband that arrowband UE works.So, if N _rBfor even number, have:

As the cellIDmod3=0 of community, select to be numbered N _rBthe highest subcarrier of the RB medium frequency of/2-1 is as DC subcarrier.

For the community of cellIDmod3=1, select to be numbered N _rBthe highest subcarrier of the RB medium frequency of/2-1 as DC subcarrier, or is numbered N _rBthe minimum subcarrier of the RB medium frequency of/2 is as DC subcarrier.

For the community of cellIDmod3=2, select to be numbered N _rBthe minimum subcarrier of the RB medium frequency of/2 is as DC subcarrier.

If N _rBfor odd number, so have:

As the cellIDmod3=0 of community, select to be numbered rB medium frequency from low to high the 6th subcarrier (several from 1, being all hypothesis like this in below describing) as DC subcarrier.

For the community of cellIDmod3=1, select to be numbered rB medium frequency from low to high the 6th subcarrier or the 7th subcarrier as DC subcarrier.

For the community of cellIDmod3=2, select to be numbered rB medium frequency from low to high the 7th subcarrier as DC subcarrier.

for rounding downwards.

Fig. 3 is a schematic diagram about non-MBSFN sub-frame DC sub-carrier positions.Wherein, cellIDmod3=0, the maximum RB number shared by the arrowband of arrowband UE is 6, for the RB#4 ~ RB#9 of Fig. 3 bend part, suppose that PDCCH accounts for first three symbol, available PDSCH takies 11 symbols after the 4th symbol, and DC subcarrier is only present in 11 symbols below.The frequency location of DC subcarrier is subcarrier the highest in RB#6.

In MBSFN sub-frame, do not have CRS, only have DMRS, the position of DC is relevant with DMRS pattern.

Give the pattern of DMRS in Fig. 4, Cyclic Prefix is normal cyclic prefix.In Fig. 4 left figure be port7,8,11,13 RE taken, right figure is port9,10,12,14 RE taken.

Suppose that maximum RB number corresponding to narrow band bandwidth that arrowband UE supports is N _rB, system is the pre-configured arrowband of arrowband UE is N _rBindividual RB, in arrowband according to frequency increase order by N _rBit is 0,1,2 that individual RB renumbers ... N _rB-1, suppose do not have PRS and CSI-RS in arrowband, system bandwidth is 20M, every N _rBindividual RB is the arrowband that arrowband UE works.

If the DMRS port that eNB adopts only comprises one or more in port7,8,11,13, so work as N _rBduring for even number, select to be numbered N _rBthe minimum subcarrier of the RB medium frequency of/2 as DC subcarrier, if N _rBfor odd number, so select to be numbered rB medium frequency from low to high the 6th subcarrier as DC subcarrier.

If the DMRS port that eNB adopts only comprises prt9,10, one or more in 12,14, so works as N _rBduring for even number, select to be numbered N _rBthe highest subcarrier of the RB medium frequency of/2-1 as DC subcarrier, if N _rBfor odd number, so select to be numbered rB medium frequency from low to high the 7th subcarrier as DC subcarrier.

If the DMRS port that eNB adopts comprises in port7,8,11,13 one or more, and comprise prt9,10, one or more in 12,14, so work as N _rBduring for even number, select to be numbered N _rBthe RB medium frequency of/2-1 from low to high the 10th subcarrier, as DC subcarrier, or is selected to be numbered N _rBthe RB medium frequency of/2 from low to high the 3rd subcarrier as DC subcarrier.If N _rBfor odd number, so select to be numbered rB medium frequency from low to high the 5th subcarrier or the 8th subcarrier as DC subcarrier.

Fig. 5 is the example of the DC sub-carrier positions of a MBSFN sub-frame, as shown in Figure 5, maximum RB number shared by the arrowband of arrowband UE is 6, for the RB#4 ~ RB#9 of Fig. 5 bend part, the DMRS port that eNB adopts only comprises port7, suppose that PDCCH accounts for first three symbol, available PDSCH takies 11 symbols after the 4th symbol, and DC subcarrier is only present in 11 symbols below.The frequency location of DC subcarrier is subcarrier minimum in RB#7.

Fig. 6 mono-is about the schematic diagram of non-MBSFN sub-frame DC sub-carrier positions.Wherein, cellIDmod3=0, the maximum RB number shared by the arrowband of arrowband UE is 6, system is the pre-configured RB number of arrowband UE is 7, for the RB#4 ~ RB#9 of Fig. 6 bend part, suppose that PDCCH accounts for first three symbol, DC subcarrier is only present in 11 data symbols below.The frequency location of DC subcarrier is RB#7 medium frequency the 6th subcarrier from low to high.

The example of Fig. 7 to be DC sub-carrier positions be 300KHz integral multiple.According to the integral multiple that the DC sub-carrier positions of the regulation system bandwidth of prior art is 300KHz, the DC that arrowband UE is corresponding differs 10 RB with the DC of system bandwidth, i.e. 120 subcarriers, i.e. 6000KHz, is also the integral multiple of 300KHz.Arrowband UE can find DC subcarrier by frequency sweep, and receives synchronizing signal, MIB and/or SIB.

In the arrowband that arrowband UE works, the definition mode of RB has following several:

Still define according to the RB of system;

RB definition is re-started according to the position of DC subcarrier in arrowband, can be different with the RB definition of system.As shown in Figure 8, oblique line portion is the arrowband for arrowband UE works, and bold box represents the definition mode of the RB of arrowband UE in arrowband, and the definition mode of the RB of thin wire frame representation system, both are not identical.

Information MAP can be following one to the mode of physical resource:

(1) one of them RB is regarded as be less than 12 subcarriers and carry out resource mapping, such as in figure 3, can the sub-carrier number of RB#6 be regarded as 11.

(2) conventionally all RB are regarded as 12 subcarriers and carry out resource mapping, then the information in DC sub-carrier positions is destroyed.Such as in figure 3, can conventionally by information MAP on these 6 RB of RB#4 ~ RB#9, on the symbol at PDSCH place, the information of the sub-carrier positions of RB#6 highest frequency is destroyed afterwards.

The transmission and reception process of downstream signal:

ENB determines the position of DC subcarrier according to the mode (in other words predefined mode) preset, and is then sent to physical resource by information MAP.

UE is according to presetting, or the mode of eNB notice determines the position of DC subcarrier, then RF center frequency point to be adjusted to the position of DC subcarrier, carry out the reception of downstream signal, and complete the demapping of downstream signal.

Embodiment two:

The PDSCH of certain UE be by control information across subframe scheduling to a position, when the RB comprised in PDSCH is no longer confined to a pre-configured arrowband, the RB that now DC subcarrier can dispatch the PDSCH place of this UE according to eNB presets or the position of predefine DC subcarrier.Can refer to determine by any one rule below according to presetting predefined mode obtains DC subcarrier in other words position:

Rule 1, be UE pre-configured arrowband in arrowband by the system that all RB between RB to the highest RB minimum for the frequency of scheduling regard as in embodiment one, then the position of DC subcarrier is defined according to the mode in embodiment one, here, DC subcarrier can not on the RB of scheduling.Such as control channel is dispatched an arrowband UE and is received RB#17, and the PDSCH on 18 and 21 these three RB, RB#17 ~ 21 have 5 RB altogether, so by the N in embodiment one _rB=5 positions determining DC.

Rule 2, the some RB regarded as according to certain rule by the RB at the PDSCH place of execution cost UE in an arrowband, determine the position of DC subcarrier according to the method in embodiment one.Suppose that the RB that the frequency of this arrowband UE dispatched is minimum is RB#n, so by RB#n to RB#n+N _rBn between-1 _rBit is the pre-configured arrowband of arrowband UE that individual RB regards system as.Then the position of DC subcarrier is defined according to the mode in embodiment one.Such as control channel is dispatched arrowband UE and is received RB#17, and RB corresponding to the maximum bandwidth that the PDSCH on 18 and 21 these three RB, arrowband UE support is 6, so in RB#17 ~ 22 according to the position determining DC subcarrier in embodiment one.Or, by RB#n to RB#n'-N _rBn between+1 _rBit is the pre-configured arrowband of arrowband UE that individual RB regards eNB as, then defines the position of DC subcarrier according to the mode in embodiment one, is not limited to such method in practical application.

One of rule 3, the RB RB being defined as scheduling at DC subcarrier place, and DC subcarrier is nearest from the center of the minimum RB to the highest RB of the frequency of a scheduling available DC subcarrier.

Above-mentioned mode is not limited in practical application.

Can be wherein predefine or the default subcarrier met in the following set of one or more condition or the subset of described set with DC subcarrier:

Condition one, DC sub-carrier positions are determined by the cellID of community.

As the cellIDmod3=0 of community, DC sub-carrier indices k meets kmod3=1 or 2; As the cellIDmod3=1 of community, DC sub-carrier indices k meets kmod3=0 or 2; As the cellIDmod3=2 of community, DC sub-carrier indices k meets kmod3=0 or 1.

The reference signal that condition two, DC sub-carrier positions are adopted for certain UE by eNB is determined.

If adopt DMRS, on the RB adopting described DMRS,

When adopting normalCP,

If system configuration PRS, so in the subframe being configured with PRS and RB, also should meet at described DC subcarrier:

If the transmitting antenna port number adopting normalCP and PBCH to adopt is 1 or 2, so DC sub-carrier indices k meets kmod12=C, C ∈ { 2,8};

Further, if system configuration CSI-RS, so the subframe of CSI-RS is being configured with, on the subcarrier of described DC subcarrier outside the subcarrier at CSI-RS place.Utilize such method, the normal transmission of the CSI-RS in the sub-frame configuration being configured with CSI-RS can be ensured.

Described available DC subcarrier is only present on the symbol at available PDSCH place.

Further, the subcarrier in available subcarrier set is relevant with system bandwidth.Such as system bandwidth is that the system of 5M has 15 available subcarriers, and system bandwidth is that the system of 10M has 30 available subcarriers.

Further, available subcarrier can be the subcarrier according to certain regular distribution, is such as the subcarrier be spacedly distributed.

Further, the PDSCH of scheduling can specify: if fall into the pre-configured available arrowband of a system, DC subcarrier is now the DC subcarrier of described available arrowband, and the DC subcarrier of described arrowband can be pre-define according to the mode in embodiment one.The pre-configured arrowband of such as system is RB#4 ~ 9, RB#10 ~ 16 etc., when the PDSCH of certain UE of eNB scheduling be RB4,5,6 time, so DC is the DC of RB#4 ~ 9, arrowband.

In addition, the DC subcarrier that the control channel of described arrowband UE is corresponding and DC sub-carrier positions corresponding to the Traffic Channel of described UE do not overlap.As shown in Figure 9.

Further, after determining DC sub-carrier positions, DC sub-carrier positions is informed to adjacent area eNB by eNB, to avoid eNB transmitted power in the DC sub-carrier positions of this community in adjacent area excessive, causes interference.Information MAP can be following one to the mode of physical resource:

(1) one of them RB is regarded as be less than 12 subcarriers and carry out resource mapping.

(2) conventionally all RB are regarded as 12 subcarriers and carry out resource mapping, then the information in DC sub-carrier positions is destroyed.

The transmission and reception process of downstream signal:

ENB determines the position of DC subcarrier according to the mode preset, and is then sent to physical resource by information MAP.

UE is according to predefine or default, or the mode of eNB notice determines DC position, then RF center frequency point is adjusted to the position of DC subcarrier, carries out the reception of downstream signal, and complete the demapping of downstream signal.

One is determined DC sub-carrier positions example according to above-mentioned regular 3 is provided in Figure 10.Wherein control information is on 6 RB of oblique line portion, and the PDSCH of certain arrowband UE of scheduling is at point-like portion, and the position of its DC subcarrier as shown in Figure 10.

Embodiment three:

For the scene in embodiment two, the position of DC subcarrier also can be notified by control channel

The positional information of DC subcarrier can be comprised in control information, a DC subcarrier can be shared to make multiple UE.DC sub-carrier positions information in control information can be the call number of a DC subcarrier.In this case available in the whole bandwidth of system meeting predefine DC subcarrier, identical with the available subcarrier definition mode in embodiment two, repeat no more here.

Can indicate the call number of DC subcarrier in the control information, indication information can be an absolute value, such as supposes to have in 1 RB the DC sub-carrier positions that 2 available, supposes that one has 200 available DC sub-carrier positions, so adopt in 20M system individual bit indicates DC sub-carrier positions.Indication information also can be a relative value, and such as suppose to have in 1 RB the DC sub-carrier positions that 2 are available, the RB number distributing to UE mostly is 6 most, so can DC sub-carrier positions one have 12, so adopt individual bit indicates the position of DC subcarrier.A kind of rear method saves bit more.

The example of Figure 11 to be the indication information in a control information be relative value, wherein control information is on 6 RB of oblique line portion, the PDSCH of certain arrowband UE of scheduling is at point-like portion, indicate " 001 " in the control information, represent that DC subcarrier is counted at the RB from low-limit frequency, in second available DC sub-carrier positions.

Above-mentioned mode is not limited in practical application.

Further, the PDSCH of scheduling can specify: if fall into the pre-configured available arrowband of a system, DC subcarrier is now the DC subcarrier of described available arrowband, and the DC subcarrier of described arrowband can be pre-define according to the mode in embodiment one.

Further, after determining DC sub-carrier positions, DC position informing to adjacent area eNB, to avoid eNB transmitted power in the DC sub-carrier positions of this community in adjacent area excessive, is caused interference by eNB.

Information MAP can be following one to the mode of physical resource:

The transmission and reception process of downstream signal:

ENB determines DC position according to predefine or default mode, is then sent to physical resource by information MAP.

UE is according to predefine or default, or the mode of eNB notice determines DC sub-carrier positions, then RF center frequency point is adjusted to DC sub-carrier positions, carries out the reception of downstream signal, and complete the demapping of downstream signal.

Embodiment four

Except the DC sub-carrier positions of system bandwidth, eNB side does not define DC sub-carrier positions, and when UE receives the signal on arrowband, DC subcarrier is positioned at the centre of two subcarriers, and the impact of local oscillator leakage is less.Suppose that arrowband is 6 RB, when arrowband UE receives narrow band signal, DC subcarrier is positioned at the centre frequency position of 6 RB, namely suppose that the RB that frequency is minimum is the 1st RB, the like, the RB that frequency is the highest is the 6th RB, and so DC sub-carrier positions is in the centre position of the subcarrier of the subcarrier of the highest frequency of the 3rd RB and the low-limit frequency of the 4th RB.

For the mode across carrier dispatching, UE also can receive according to similar above-mentioned mode, such as the RB of scheduling is regarded as an arrowband or according to the mode in embodiment two RB of scheduling regarded as the RB in certain arrowband, in a manner mentioned above by the centre of DC subcarrier two subcarriers in arrowband.Such mode is not limited in practical application.

Certainly; the present invention also can have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to claim of the present invention.

Claims

1. a sending method for downstream signal, comprising:

2. the method for claim 1, is characterized in that, the position that the described mode according to presetting obtains direct current DC subcarrier comprises:

When adopting general cyclic prefix normalCP,

3. method as claimed in claim 2, it is characterized in that, described DC subcarrier is only present on the symbol at available Physical Downlink Shared Channel PDSCH place.

4. method as claimed in claim 2, it is characterized in that, the position of described DC subcarrier also meets the following conditions:

5. method as claimed in claim 2, it is characterized in that, the position of described DC subcarrier also meets the following conditions: in the subframe of channel condition information measurement pilot frequency configuration CSI-RS, on the subcarrier of described DC subcarrier outside the subcarrier at CSI-RS place.

6. method as claimed in claim 2, it is characterized in that, the position of described DC subcarrier also meets the following conditions: be the pre-configured arrowband of UE for an eNB, described DC subcarrier is from a nearest subcarrier of the center frequency point of described arrowband, or from the nearest multiple subcarriers of the center frequency point of described arrowband.

7. method as claimed in claim 6, it is characterized in that, the position of described DC subcarrier is:

8. method as claimed in claim 7, it is characterized in that, the position of described DC subcarrier in described RB is determined by cellID or reference signal.

9. method as claimed in claim 8, is characterized in that, described eNB is that the pre-configured arrowband of UE aligns with the Resource Block group RBG of system.

10. the method according to any one of claim 6 ~ 9, is characterized in that:

To be the pre-configured arrowband of UE be described eNB according to the model split expanded to both sides from system bandwidth center, or according to minimum to the highest or be up to minimum model split from frequency from frequency.

11. the method for claim 1, is characterized in that, the position that the described mode according to presetting obtains subcarrier comprises:

12. methods as claimed in claim 11, is characterized in that, the described RB taken according to the PDSCH of UE of scheduling determines that the method for the position of DC subcarrier is one of following:

13. the method for claim 1, is characterized in that, the position that the mode indicated according to described control information obtains DC subcarrier comprises:

14. methods according to any one of claim 11 ~ 13, is characterized in that, also comprise before obtaining the position of direct current DC subcarrier:

The set of predefine available subcarrier;

If adopt DMRS, on the RB adopting described DMRS:

When adopting normalCP,

15. methods as claimed in claim 14, is characterized in that, described available subcarrier is only present on the symbol at available Physical Downlink Shared Channel PDSCH place.

16. methods as claimed in claim 14, it is characterized in that, described available subcarrier also meets the following conditions:

17. methods as claimed in claim 14, it is characterized in that, described available subcarrier also meets the following conditions: in the subframe of channel condition information measurement pilot frequency configuration CSI-RS, on the subcarrier of described available subcarrier outside the subcarrier at CSI-RS place.

18. methods according to any one of claim 11 to 13, is characterized in that, when the RB that described PDSCH takies is included in a pre-configured arrowband, described DC subcarrier is the DC subcarrier of described pre-configured arrowband.

19. the method for claim 1, is characterized in that, the DC sub-carrier positions that the Traffic Channel of the DC subcarrier that the control channel of arrowband UE is corresponding and described arrowband UE is corresponding does not overlap.

20. the method for claim 1, is characterized in that, the position of the described DC subcarrier of neighbor cell is identical.

21. the method for claim 1, is characterized in that, also comprise after the step of the position of described acquisition DC subcarrier: eNB by the position informing of obtained DC subcarrier to adjacent area eNB.

22. the method for claim 1, is characterized in that, described eNB comprises information MAP to be sent to physical resource sends:

The method of reseptance of 23. 1 kinds of downstream signals, comprising:

24. methods as claimed in claim 23, is characterized in that, the position that the described mode according to presetting obtains subcarrier comprises:

When adopting general cyclic prefix normalCP,

25. methods as claimed in claim 23, is characterized in that, described DC subcarrier is only present on the symbol at available Physical Downlink Shared Channel PDSCH place.

26. methods as claimed in claim 23, it is characterized in that, the position of described DC subcarrier also meets the following conditions:

27. methods as claimed in claim 23, it is characterized in that, the position of described DC subcarrier also meets the following conditions: in the subframe of channel condition information measurement pilot frequency configuration CSI-RS, on the subcarrier of described DC subcarrier outside the subcarrier at CSI-RS place.

28. methods as claimed in claim 23, it is characterized in that, the position of described DC subcarrier also meets the following conditions: be the pre-configured arrowband of UE for an eNB, described DC subcarrier is from a nearest subcarrier of the center frequency point of described arrowband, or from the nearest multiple subcarriers of the center frequency point of described arrowband.

29. methods as claimed in claim 28, it is characterized in that, the position of described DC subcarrier is:

30. methods as claimed in claim 29, is characterized in that, the position of described DC subcarrier in described RB is determined by cellID or reference signal.

31. methods as claimed in claim 30, is characterized in that, described eNB is that the pre-configured arrowband of UE aligns with the Resource Block group RBG of system.

32. methods as claimed in claim 23, is characterized in that, the position that the described mode according to presetting obtains subcarrier comprises:

33. methods as claimed in claim 32, is characterized in that, the described RB taken according to the PDSCH of this UE determines that the method for the position of DC subcarrier is one of following:

34. methods as claimed in claim 23, is characterized in that, the position that the mode indicated according to described control information obtains DC subcarrier comprises:

35. methods according to any one of claim 32 ~ 34, is characterized in that, also comprise before obtaining the position of direct current DC subcarrier:

The set of predefine available subcarrier;

If adopt DMRS, on the RB adopting described DMRS:

When adopting normalCP,

36. methods as claimed in claim 35, is characterized in that, described available subcarrier is only present on the symbol at available Physical Downlink Shared Channel PDSCH place.

37. methods as claimed in claim 35, it is characterized in that, described available subcarrier also meets the following conditions:

38. methods as claimed in claim 35, it is characterized in that, described available subcarrier also meets the following conditions: in the subframe of channel condition information measurement pilot frequency configuration CSI-RS, on the subcarrier of described available subcarrier outside the subcarrier at CSI-RS place.

39. methods according to any one of claim 32 to 34, is characterized in that, when the RB that described PDSCH takies is included in a pre-configured arrowband, described DC subcarrier is the DC subcarrier of described pre-configured arrowband.

40. methods as claimed in claim 23, is characterized in that, when described UE is arrowband UE, the DC sub-carrier positions that the Traffic Channel of the DC subcarrier that control channel is corresponding and described UE is corresponding does not overlap.

41. methods as claimed in claim 23, is characterized in that, described UE receives downstream signal according to the position of determined described DC subcarrier and carries out demapping and comprises:

The dispensing device of 42. 1 kinds of downstream signals, is arranged in eNB, it is characterized in that, comprising:

43. devices as claimed in claim 42, is characterized in that, the position that described acquisition module obtains subcarrier according to the mode preset refers to:

When adopting general cyclic prefix normalCP,

44. devices as claimed in claim 43, is characterized in that, described DC subcarrier is only present on the symbol at available Physical Downlink Shared Channel PDSCH place.

45. devices as claimed in claim 43, it is characterized in that, the position of described DC subcarrier also meets the following conditions:

46. devices as claimed in claim 43, it is characterized in that, the position of described DC subcarrier also meets the following conditions: in the subframe of channel condition information measurement pilot frequency configuration CSI-RS, on the subcarrier of described DC subcarrier outside the subcarrier at CSI-RS place.

47. devices as claimed in claim 43, it is characterized in that, the position of described DC subcarrier also meets the following conditions: be the pre-configured arrowband of UE for an eNB, described DC subcarrier is from a nearest subcarrier of the center frequency point of described arrowband, or from the nearest multiple subcarriers of the center frequency point of described arrowband.

48. devices as claimed in claim 47, it is characterized in that, the position of described DC subcarrier is:

49. devices as claimed in claim 48, is characterized in that, the position of described DC subcarrier in described RB is determined by cellID or reference signal.

50. devices as claimed in claim 49, is characterized in that, described eNB is that the pre-configured arrowband of UE aligns with the Resource Block group RBG of system.

51. devices according to any one of claim 47 ~ 50, is characterized in that:

52. devices as claimed in claim 42, is characterized in that, the position that described acquisition module obtains subcarrier according to the mode preset refers to:

53. devices as claimed in claim 52, is characterized in that, according to the RB that the PDSCH of UE of scheduling takies, described acquisition module determines that the mode of the position of DC subcarrier is one of following:

54. devices as claimed in claim 42, it is characterized in that, the position that described acquisition module obtains DC subcarrier according to the mode that described control information indicates refers to:

55. devices according to any one of claim 52 ~ 54, is characterized in that:

The position that described acquisition module obtains direct current DC subcarrier obtains in predefined available subcarrier set or its subset;

If adopt DMRS, on the RB adopting described DMRS:

When adopting normalCP,

56. devices as claimed in claim 55, is characterized in that, described available subcarrier is only present on the symbol at available Physical Downlink Shared Channel PDSCH place.

57. devices as claimed in claim 55, it is characterized in that, described available subcarrier also meets the following conditions:

58. devices as claimed in claim 55, it is characterized in that, described available subcarrier also meets the following conditions: in the subframe of channel condition information measurement pilot frequency configuration CSI-RS, on the subcarrier of described available subcarrier outside the subcarrier at CSI-RS place.

59. devices according to any one of claim 52 to 54, is characterized in that, when the RB that described PDSCH takies is included in a pre-configured arrowband, described DC subcarrier is the DC subcarrier of described pre-configured arrowband.

60. devices as claimed in claim 42, is characterized in that, the DC sub-carrier positions that the Traffic Channel of the DC subcarrier that the control channel of arrowband UE is corresponding and described arrowband UE is corresponding does not overlap.

61. devices as claimed in claim 42, is characterized in that, the position of the described DC subcarrier that the described acquisition module of neighbor cell obtains is identical.

62. devices as claimed in claim 42, is characterized in that:

Described acquisition module also for by the position informing of obtained DC subcarrier to adjacent area eNB.

63. devices as claimed in claim 42, is characterized in that, described sending module refers to information MAP to be sent to physical resource sends:

The receiving system of 64. 1 kinds of downstream signals, is arranged in user terminal, it is characterized in that, comprising:

65. devices as described in claim 64, is characterized in that, the position that described acquisition module obtains subcarrier according to the mode preset comprises:

When adopting general cyclic prefix normalCP,

66. devices as described in claim 65, it is characterized in that, described DC subcarrier is only present on the symbol at available Physical Downlink Shared Channel PDSCH place.

67. devices as described in claim 65, it is characterized in that, the position of described DC subcarrier also meets the following conditions:

68. devices as described in claim 65, it is characterized in that, the position of described DC subcarrier also meets the following conditions: in the subframe of channel condition information measurement pilot frequency configuration CSI-RS, on the subcarrier of described DC subcarrier outside the subcarrier at CSI-RS place.

69. devices as described in claim 65, it is characterized in that, the position of described DC subcarrier also meets the following conditions: be the pre-configured arrowband of UE for an eNB, described DC subcarrier is from a nearest subcarrier of the center frequency point of described arrowband, or from the nearest multiple subcarriers of the center frequency point of described arrowband.

70. devices as described in claim 69, it is characterized in that, the position of described DC subcarrier is:

71. devices as described in claim 70, it is characterized in that, the position of described DC subcarrier in described RB is determined by cellID or reference signal.

72. devices as described in claim 71, is characterized in that, described eNB is that the pre-configured arrowband of UE aligns with the Resource Block group RBG of system.

73. devices as described in claim 64, is characterized in that, the position that described acquisition module obtains subcarrier according to the mode preset refers to:

74. devices as described in claim 73, is characterized in that, described acquisition module determines that according to the RB that the PDSCH of this UE takies the mode of the position of DC subcarrier is one of following:

75. devices as described in claim 64, it is characterized in that, the position that described acquisition module obtains DC subcarrier according to the mode that described control information indicates refers to:

76. devices according to any one of claim 73 ~ 75, is characterized in that:

When described acquisition module obtains the position of direct current DC subcarrier, be obtain in predefined available subcarrier set or its subset;

If adopt DMRS, on the RB adopting described DMRS:

When adopting normalCP,

77. devices as described in claim 76, it is characterized in that, described available subcarrier is only present on the symbol at available Physical Downlink Shared Channel PDSCH place.

78. devices as described in claim 76, it is characterized in that, described available subcarrier also meets the following conditions:

79. devices as described in claim 76, it is characterized in that, described available subcarrier also meets the following conditions: in the subframe of channel condition information measurement pilot frequency configuration CSI-RS, on the subcarrier of described available subcarrier outside the subcarrier at CSI-RS place.

80. devices according to any one of claim 73 to 75, is characterized in that, when the RB that described PDSCH takies is included in a pre-configured arrowband, described DC subcarrier is the DC subcarrier of described pre-configured arrowband.

81. devices as described in claim 64, it is characterized in that, when described UE is arrowband UE, the DC sub-carrier positions that the Traffic Channel of the DC subcarrier that control channel is corresponding and described UE is corresponding does not overlap.

82. devices as described in claim 64, is characterized in that, described reception receives downstream signal according to the position of determined described DC subcarrier and carries out demapping and refers to: