CN102484526A

CN102484526A - Apparatus for transmitting and receiving control information for repeater and method thereof

Info

Publication number: CN102484526A
Application number: CN2010800373897A
Authority: CN
Inventors: 朴奎镇; 文诚颢; 权英炫; 郑载薰
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2009-06-26
Filing date: 2010-06-28
Publication date: 2012-05-30
Anticipated expiration: 2030-06-28
Also published as: CN102484526B

Abstract

Disclosed are an apparatus for transmitting and receiving control information for a repeater and a method thereof. The repeater for receiving control information in a wireless communication system comprises: a receiving module for receiving through higher layer signaling from a base station the information on a resource block (RB) which the repeater should search to receive the control information; a processor for detecting the control information from the first RB by blind-decoding at least one received RB which should be searched; and a receiving module for receiving through the first RB from the base station the control information detected by the processor.

Description

Send and receive the device and method thereof of the control information for via node

Technical field

The present invention relates to wireless communication system, and more particularly, to a kind of device and method thereof for being used to send and receive the control information for via node.

Background technology

Third generation partner program Long Term Evolution (3GPP LTE) and senior LTE (" LTE-A ") communication system are will be briefly described, it is can to apply the example of the wireless communication system of the present invention.

Fig. 1 is the figure for the network structure for schematically showing the evolved universal GSM (E-UMTS) as example wireless communications.E-UMTS systems currently carry out from conventional UMTS system evolution and just its basic standardization in 3 gpp.E-UMTS may be generally referred to as Long Term Evolution (LTE) system.For the details of UMTS and E-UMTS technical specification, with reference to " 3rd Generation Partnership Project；Technical Specification Group Radio Access Network " version 7 and version 8.

With reference to Fig. 1, E-UMTS includes user equipment (UE) 120, eNB (or eNode Bs or base station) 110a and 110b and positioned at the end of network (E-UTRAN) and is connected to the access gateway (AG) of external network.ENB can send multiple data flows for broadcast service, multicast service and/or unicast services simultaneously.

Each eNB may have one or more cells.Cell is arranged to provide downlink or uplink transmission services using one in 1.25,2.5,5,10 and 20MHz bandwidth for multiple UE.Different districts can be configured to provide different bandwidth.ENB controls send and receive for multiple UE data.ENB sends the downlink schedule information on down link data wherein to notify time domain/frequency domain, coding, size of data and hybrid automatic repeat-request (HARQ) relevant information for sending data to corresponding UE.In addition, the uplink scheduling information on UL data is sent to corresponding UE to be notified to UE with time domain/frequency domain, coding, size of data and HARQ relevant informations by eNB.The interface for being used for sending customer service or control business can be used between eNB.Core network (CN) can be included for UE network node, AG of user's registration etc..AG is based on the mobility that tracing area (TA) manages UE, and one of TA includes multiple cells.

Although wireless communication technology has evolved to the LTE based on WCDMA (WCDMA), the demand and expectation sustainable growth of user and supplier.Further, since other wireless access technologys continue to develop, therefore it is required that new technology ensures the competitiveness in future.For example, it is desirable to the suitable power consumption of the reduction of cost, the increase of service availability, the flexible use of frequency band, simple structure, open interface and UE per bit.

3GPP has been carried out the standardization of following technology recently.The technology is referred to as " LTE-A " in specification.One of difference between LTE system and lte-a system is the introducing of system bandwidth difference and via node.

Maximum 100MHz broadband is supported in lte-a system plan.In order to realize this, lte-a system, which is used, realizes the carrier aggregation or aggregated bandwidth of wide bandwidth by using multiple frequency blocks.Carrier aggregation uses multiple frequency blocks as one big logic frequency band to use broader frequency band.The bandwidth of each frequency block can be defined based on the bandwidth of the system block used in LTE system.Each frequency block is sent using component carrier.

When the channel status between eNB and UE is very poor in a wireless communication environment, via node (RN) can be installed between eNB and UE to provide the wireless channel of more preferable channel status to UE.In addition, by introducing RN in the cell border areas with poor channel state, high data rate channel can be provided and cell serves area can be expanded.Therefore, RN is currently widely used as being introduced into solving the technology of the wireless shadow region in wireless communication system.

The function for the repeater that past RN technologies are limited to simply amplified signal and send the signal of amplification, and recent technology has developed into more intelligent form.In addition, it is also indispensable in terms of RN technologies are indispensable in terms of reduction eNB extension cost and the maintenance cost of backhaul network (backhaul network), and the Extension of service in following GSM covers and improves data throughout.As the gradually development of RN technologies is, it is necessary to the RN for supporting to use in the conventional wireless communication system by new wireless communication system.

As RN is incorporated by the lte-a system of next generation mobile communication system, it is necessary to communication construction for supporting the wireless backhaul between eNB and RN.However, not carrying out the research for being used to support resource allocation methods, control signaling, the data transmission method of wireless backhaul etc. also.

The content of the invention

Technical problem

Be designed to solve problem it is an object of the present invention to receive the method for RN node control information.

Be designed to solve problem another object of the present invention is to receive the RN of RN control information.

Be designed to solve problem another object of the present invention is to send the method for RN control information.

Be designed to solve problem another object of the present invention is to send the eNB of RN control information.

It will be appreciated by those skilled in the art that the purpose that can be realized using the present invention is not limited in the purpose being described in detail above, and the above and other purpose that the present invention can be realized will be more clearly understood according to described in detail below.

Technical scheme

The purpose of the present invention can realize that this method includes for receiving the method for the control information for RN at via node (RN) place in a wireless communication system by providing one kind：Information from eNB by top signaling reception on the RN RB that should be searched for, to receive control information；At least one RB that should be searched by blind decoding from the first RB detects control information；And receive the control information detected from eNB by the first RB.

This method may further include：If detecting control information from the first RB, control information is detected from continuous 2nd RB of the first RB；And the control information detected from the 2nd RB is received from eNB.

Control information in first RB and the 2nd RB can be by sending for sending the R-PDCCH of the control information for via node, and R-PDCCH is re-used in the first RB and the 2nd RB according to time division multiplexing (TDM) scheme, and is sent according to pre-defined rule by continuous OFDM symbol in the first RB and the 2nd RB.

R-PDCCH can distribute to different RB or time slot and can have different transformats.

The R-PDCCH sent by the first RB can include DL and authorize, and the R-PDCCH sent by the 2nd RB can include UL and authorize, wherein DL mandates are the control information needed for eNB sends data to via node, and UL mandates are the control information needed for via node sends data to eNB.

DL, which is authorized, to be sent by having OFDM symbol to index 3,4,5 and 6 OFDM symbol in the first RB, and UL is authorized and can sent by having OFDM symbol to index 7 to 13 OFDM symbol in the 2nd RB.

The purpose of the present invention can realize that the RN includes by providing a kind of via node (RN) for being configured to receive control information in a wireless communication system：Receiving module, the receiving module is configured to receive the information for the RB that should be searched on via node by top signaling from eNB, to receive control information；And processor, the processor is configured at least one RB that should be searched by blind decoding to detect control information from the first RB, and wherein receiving module is configured to receive the control information detected by processor from eNB by the first RB.

Processor is configured to detect control information from and then the first RB the 2nd RB when detecting control information from the first RB, and wherein receiving module is configured to receive the control information detected from the 2nd RB from eNB.

The purpose of the present invention can be realized by providing one kind for sending the method for the control information of via node (RN) at eNode B (eNB) place in a wireless communication system, this method includes sending the multiple R-PDCCH for being used for sending control information to via node, wherein R-PDCCH is re-used according to time division multiplexing (TDM) scheme, and is sent according to pre-defined rule by multiple continuous OFDM symbols in same RB.

R-PDCCH can be assigned to different RB or time slot and be sent, and R-PDCCH can have different transformats.

The first R-PDCCH in the multiple R-PDCCH can include DL and authorize, the 2nd R-PDCCH in the multiple R-PDCCH can include UL and authorize, DL mandates are the control information needed for eNB sends data to via node, UL mandates are the control information needed for via node sends data to eNB, first PDCCH can distribute to the first RB and be sent, and the 2nd PDCCH can be assigned to the 2nd RB and be sent.

The purpose of the present invention a kind of can be used to sending the eNB of control information for via node in a wireless communication system realizing by providing, the eNB includes sending module, the sending module is configured to send the multiple R-PDCCH for being used for sending control information to via node, and wherein R-PDCCH is re-used by TDM and sent according to pre-defined rule by multiple continuous OFDM symbols in same RB.

Advantageous effects

Method according to the reception of the present invention for RN control information, RN can be efficiently received control information to improve communication performance.

According to the method for distribution and the mapping of the method and reception and registration RN control information for RN control information being distributed and being mapped to specific resources, eNB can effectively send control information to RN.

It will be appreciated by those skilled in the art that be not limited to using the effect that can realize of the present invention in those being described in detail above, and the further advantage of the present invention will be more clearly understood from the following detailed description.

Brief description of the drawings

The accompanying drawing for being included to provide a further understanding of the present invention shows embodiments of the present invention and is used to explain principle of the invention together with the description.In the accompanying drawings：

Fig. 1 is the figure for schematically showing the E-UMTS network structures as example mobile communication system；

Fig. 2 shows the structure of the radio frames used in the 3GPP LTE systems as example mobile communication system；

Fig. 3 is shown as the uplink sub-frames and the structure of downlink subframe of the 3GPP LTE systems of example mobile communication system；

Fig. 4 shows the downlink running time-frequency resource grid structure used in the present invention；

Fig. 5 shows the configuration of the relay return link and relaying access link in wireless communication system；

Fig. 6 is shown as being distributed to RN exemplary resources region by eNB in the 3GPP lte-a systems of example mobile communication system；And

Fig. 7 is the block diagram for the component for showing the equipment 50 according to the present invention.

Embodiment

Now with detailed reference to the preferred embodiment with reference to the accompanying drawings of the present invention.The illustrative embodiments of the present invention will be intended to explain below with reference to the detailed description that accompanying drawing is provided, rather than only illustrated the ability to according to the embodiment of the invention implemented.Following detailed description includes specific detail to provide the comprehensive understanding of the present invention.However, it will be apparent to those of ordinary skill in the art that the present invention can be implemented in the case of these no specific details.For example, assuming that in the case of using the system for meeting one of 3GPP LTE series standards, providing the following detailed description.However, in addition to the intrinsic special characteristic of 3GPP LTE series standards, description below can be applied to any other GSM.

In some cases, it is known that construction and device be omitted or show in form of a block diagram, be primarily upon the key character of construction and device, in order to do not cover the present invention thought.It will make same or similar part is denoted by the same reference numerals in this manual.

In the following description, term terminal refers generally to movement or the fixing user terminal device of user equipment (UE), movement station (MS) etc..In addition, term base station (BS) refers generally to any node at network end-point with UE communication, such as node B, eNode B.

In mobile communication system, UE from eNB receive informations and can will send information to eNB by downlink by up-link.The information for being sent by UE or being received includes data and control information and there are various physical channels according to the type and purpose of the information for being sent by UE or being received.

Fig. 2 is shown as the structure of the radio frames used in the 3GPPLTE systems of example mobile communication system.

With reference to Fig. 2, a radio frames have 10ms (327200Ts) length and including ten subframes with equal sizes.Each subframe has 1ms length and includes two time slots of each length with 0.5ms (15360Ts).Here, Ts refers to be expressed as Tx=1/ (15kHz × 2048)=3.2552 × 10^-8The sampling time of (about 33ns).Time slot includes multiple OFDMs (OFDM) symbol in time domain or multiple resource blocks in multiple he Single Carrier-Frequency Division multiple access (SC-FDMA) symbol and frequency domain.

In LTE system, a resource block includes 12 individual OFDM symbols of subcarrier × 7 (6) or SC-FDMA symbols.Unit interval for sending data, i.e. Transmission Time Interval (TTI) can be configured to one or more subframes.Above-mentioned wireless frame structure is exemplary, and the number of the subframe included in radio frames, the number of the time slot included in a subframe and the OFDM symbol included in each time slot or the number of SC-FDMA symbols can change in a variety of ways.

Fig. 3 is shown as the uplink sub-frames and the structure of downlink subframe of the 3GPP LTE systems of example mobile communication system.

With reference to Fig. 3 (a), a downlink subframe includes two time slots in time domain.Most three OFDM symbols in the front portion of the first time slot in downlink subframe correspond to the control area for being assigned control channel, and remaining OFDM symbol corresponds to the data area for being assigned physical down link sharing channel (PDSCH).

The example of the downlink control channel used in 3GPP LTE includes physical control format indicator channel (PCFICH), physical downlink control channel (PDCCH), Physical Hybrid ARQ Indicator channel (PHICH) etc..PCFICH sends and carried the information of the number (that is, control area size) of the OFDM symbol on the transmission for the control channel in subframe at the first OFDM symbol of subframe.It is referred to as down link control information (DCI) via the PDCCH control information transmitted.DCI includes uplink resource allocation information, downlink resource allocations information and the up-link transmission power control command organized for any user equipment (UE).PHICH carries response/non-response (ACK/NACK) signal on uplink hybrid automatic repeat request (HARQ).That is, on being sent from the ack/nack signal of the UE uplink datas sent via PHICH.

PDCCH corresponding to downlink physical channel will be described.

PDCCH can carry PDSCH resource allocation and transformat (can be referred to as DL mandate), PUSCH resource allocation information (can be referred to as UL mandates), one group on transmission power control command, activation of IP phone (VoIP) of each UE in any UE groups etc..Multiple PDCCH can be sent in control area.UE can monitor PDCCH.PDCCH includes the set of one or more continuous control channel elements (CCE).PDCCH can be sent after sub-block intertexture in control area.CCE is the logical allocation unit for providing code rate to PDCCH for the state based on wireless channel.CCE corresponds to multiple resource element groups.Correlation between the code rate provided according to CCE number and by CCE determines PDCCH form and available PDCCH bit number.

The control information carried on PDCCH is referred to as DCI.Table 1 shows the DCI according to DCI format.

[table 1]

DCI format 0 transmits uplink resource allocation information, and DCI format 1 to DCI format 2 is used to represent downlink resource allocations information, and DCI format 3 and DCI format 3A represent up-link transmit power control (TPC) order for UE groups.

With reference to Fig. 3 (b), uplink sub-frames can be divided into control area and data area in a frequency domain.Control area is assigned the PUCCH for carrying uplink control information.Data area is assigned the PUSCH for carrying user data.In order to keep single-carrier property, a UE sends PUCCH and PUSCH when different.PUCCH for a UE is assigned to RB pairs in subframe.The different sub-carrier belonged in RB pairs of corresponding two time slots of RB occupancy.PUCCH RB is distributed to the frequency hopping in boundary of time slot.

Fig. 4 shows the downlink running time-frequency resource grid structure used in the present invention.The down link signal sent in each time slot can by including

Individual subcarrier and

The resource grid description of individual OFDM symbol.

The number of downlink resource blocks (RB) is represented,The number of one RB of composition subcarrier is represented, and

Represent the number of the OFDM symbol in a downlink time slots.Depending on the downlink transmission bandwidth set in respective cell and need meet

Here,The minimum downlink bandwidth that wireless communication system is supported is represented, and

Represent the maximum downlink bandwidth that wireless communication system is supported.Although

Can be 6 and

Can be 110, but their not limited to this.The number of the OFDM symbol included in one time slot can depend on the length and subcarrier spacing of cyclic prefix (CP).In the case where multiple antennas is sent, each antenna port can define a resource grid.

The resource grid of element in to(for) each antenna port is referred to as resource element (RE) and (k, l) is uniquely represented by the index in time slot.Here, k represent from 0 to

Frequency domain index, and l represent from 0 toWhen Domain Index.

RB shown in Fig. 4 is used to describe the mapping relations between physical channel and RE.RB is divided into physics RB (PRB) and virtual RB (VRB).One PRB is defined as in time domain

In individual continuous OFDM symbol and frequency domain

Individual continuous subcarrier.Here,WithIt can be predetermined value.For example,

With

There can be the value as shown in following table 2.Therefore, a PRB includes

Individual RE.Although a PRB can correspond to a time slot in the time domain and correspond to 180kHz, not limited to this in a frequency domain.

[table 2]

One PRB has 0 to arrive in a frequency domain

In the range of value.PRB numbers n in frequency domain_PRBRelation between resource element (k, l) in a time slot is met

VRB has equal size with PRB.VRB is divided into centralized VRB (LVRB) and virtual reality B (DVRB).For each VRB types, a pair of VRB in two time slots of a subframe are assigned single VRB numberings n_VRB。

VRB can have equal size with PRB, and two time slots in a subframe are assigned to for each LVRB and DVRB, a pair of VRB with single VRB indexes (it can be referred to as VRB numberings).In other words, first time slot in a subframe in two time slots is belonged to

Individual VRB be assigned from 0 toIn the range of index in one, and belong to second time slot

Individual VRB be also assigned from 0 to

In the range of index in one.

The relaying physical downlink control channel (R-PDCCH) used in the present invention represents the backhaul physical downlink control channel for relay transmission, and R-PUCCH represents the backhaul physical uplink control channel for relay transmission.Relaying physical down link sharing channel (R-PDSCH) represents backhaul downlink physical data/shared channel for relay transmission, and R-PUSCH represents backhaul uplink physical data/shared channel for relay transmission.

In lte-a system, when the function of the link connection between forwarding eNB and UE is incorporated into RN, the two kinds of link with different attribute is applied to up-link and downlink carrier band.The connecting link part set up between eNB and RN link is defined as back haul link.Backhaul downlink can be expressed as according to the transmission of the back haul link of FDD or TDD schemes using down-chain resource, and backhaul uplink can be expressed as according to the transmission of FDD or TDD schemes using uplink resource.

Fig. 5 is the figure for the configuration for showing relay return link and relaying access link in wireless communication system.

With reference to Fig. 5, RN from eNB receive informations and can will send information to eNB by relay backhaul downlink by relay backhaul uplink.In addition, RN can will send information to UE and by relaying access up-link from UE receive informations by relaying access downlink.

In LTE system, RN can not receive PDCCH from eNB.Although RN can receive PDCCH if RN subframe is arranged to shift to an earlier date two or three OFDM symbols compared to eNB, the cooperation transmission between eNB and RN becomes difficult.Because the semi-static characteristic and backhaul link quality of traffic load cause Dynamic Resource Allocation for Multimedia in communication between eNB and UE to be unnecessary.That is, the fixed frequency band that RN can be configured with depending on the sub-frame mode for predetermined backhaul communication sends signal by fixed modulation and encoding scheme (MSC).In addition, eNB can be RN distribution resources in the way of distributed or centralization.

To describe by eNB is the method for RN dynamic allocation of resources and the method for the resource for passing on distribution.

With allocate resources to UE similarly, eNB and is notified the information on resource allocation to RN by physical control channel in view of traffic load gives RN distribution resources.ENB needs to be additionally provided in the new physical control channel for RN, while keeping the compatibility with LTE versions 8.Here, the new physical channel for RN is referred to as R-PDCCH, and is referred to as R-PDSCH for RN data channel.

Fig. 6 is shown as being distributed to RN exemplary resources region by eNB in the 3GPP lte-a systems of example mobile communication system.

Fig. 6 (a) shows to be multiplexed the new physical control channel 610 and the scheme of data channel 620 for RN in the enb by time division multiplexing (TDM).When being multiplexed the R-PDCCH and the R-PDSCH corresponding to data channel 620 of the new physical control channel 610 corresponded to according to TDM, the sub-frame configuration distributed for corresponding backhaul transport (or setting) can be Multicast Broadcast Single Frequency Network (MBSFN) subframe by eNB, in order to keep the compatibility with LTE versions 8, and new physical control channel 610 and data channel 620 are distributed to by MBSFN data (part in addition to control channel of MBSFN sub-frame) region by TDM.

As shown in Fig. 6 (b), the special frequency band in the subframe distributed for backhaul transport is assigned to the physical control channel 630 for RN.That is, physical control channel 630 and data channel 640 for RN can be multiplexed with frequency division multiplexing (FDM) scheme and be dispensed in the PDSCH region of correspondence subframe.In this case, to allocate resources to UE identical modes, eNB with eNB in view of RN traffic load allocates resources to each RN, and the resource of distribution is conveyed to by RN by physical control channel 630.In addition, in the compatibility of holding and LTE versions 8, eNB can distribute additional physical control channel 630 for RN.

As shown in Fig. 6 (c), in the subframe distributed for backhaul transport, eNB can distribute specific frequency band as the physical control channel 650 for RN.ENB can be multiplexed the physical control channel 650 and data channel 660 for RN by TDM and distribute them in corresponding frequency band.In this case, to allocate resources to UE identical modes, eNB with eNB in view of RN traffic load allocates resources to each RN, and the resource of distribution is conveyed to by RN by physical control channel 650.In addition, in the compatibility of holding and LTE versions 8, eNB can distribute additional physical control channel 650 for RN.

As described above, being referred to as R-PDCCH by the newly assigned physical control channels for RN of eNB.Each RN can use the resource of RN identifiers (ID) blind search dynamically distributes for downlink backhaul transport.I.e., each RN can use its RN ID blind decoding send wherein dynamically distributes R-PDCCH time domain/frequency domain, authorized and control information (for example, ACK/NACK feedback informations) with detecting the R-PDCCH for it and obtaining DL mandates, UL from the R-PDCCH detected.ENB can be notified the information on the RN RB that should be searched for RN by top signaling.RN can perform blind search (or blind decoding) based on the information on the RB that should be searched received.Here, top signaling corresponds to the semi-static signaling from eNB to RN.

The downlink backhaul data channel R-PDSCH that each RN is sent to from eNB can be distributed by following manner：It is multiplexed in backhaul subframe shown in Fig. 6 (a) by TDM and R-PDCCH；It is multiplexed in backhaul subframe shown in Fig. 6 (b) by FDM and R-PDCCH；And mixed form and the R-PDCCH multiplexing in the backhaul subframe shown in Fig. 6 (c) by TDM, FDM or TDM and FDM.

Can with RN, specifically (RN-specifically) determines that each RN performs the search space of blind search, and the specific search spaces of RN can be sent to each RN by eNB by top signaling.Or, search space can specifically be determined with cell, and eNB can will be broadcast to all RN by the specific system information of cell on the information of search space (for example, on the information for the RB that should be searched), or send information to each RN by top signaling.RB subset can be included by conveying to each RN specific search spaces of RN or the specific search space of cell.In this case, eNB can explicitly send the OFDM symbol index corresponding to the R-PDCCH sent to corresponding RN, or can implicitly fix and RN is able to know that corresponding to the R-PDCCH sent OFDM symbol index or time slot index.

Can use RN ID by R-PDCCH send to RN or by be grouped on RN information rather than individually represent that its ID sends R-PDCCH to RN.When recognizing R-PDCCH based on RN ID, each RN can configure the ID groups that RN should be searched for.Alternatively, can be by the logical message position based on RN ID identification informations, to obtain the information on each RN, while independently being decoded with RN.In this case, the perform decoding in the state of multiple RN control information item is grouped.

When carrier aggregation be applied to lte-a system in backhaul when, can configure on RN should blind search carrier wave information and the information semi-statically can be conveyed into RN by top signaling or using L1/L2 control information.Alternatively, RN can be with blind Detecting (search) all candidate carriers.

By the blind search method in the detailed resource impact scheme for R-PDCCH transmission that describes and the RN according to resource impact scheme.Before this, the scheme for mapping the resource for PDCCH transmission in LTE system by eNB is briefly described.

In general, eNB can send Scheduling assistance information and control information by PDCCH.Physical control channel can be sent by one or more CCE.One CCE includes nine resource element groups (REG).The number for being not allocated to PCFICH or PHICH REG is N_REG.The available CCE of system be 0 to

It is individual.PDCCH supports multiple format as shown in Table 3 below.A PDCCH for being configured with n continuous CCE is started with the CCE for performing i mod n=0 (i represents CCE numbers).Multiple PDCCH can be sent by a subframe.

[table 3]

PDCCH forms	CCE number	The number of resource element groups	The number of PDCCH
				0	1	9	72
1	2	18	144
				2	4	36	288
3	8	72	576

Reference table 3, eNB can will send the number in the region of control information to determine PDCCH forms based on eNB.UE can reduce overhead by reading control information based on CCE.Similarly, RN can read control information based on R-CCE.

In lte-a system, resource element (RE) can be mapped for the R-PDCCH for any RN in transmission based on R-CCE.The method that description is mapped resources into RE when eNB dynamic allocation of resources is to send R-PDCCH.

First scheme fixed OFDM symbol (for example, OFDM symbol with index 3 to 6) and can change RB number in a frequency domain to send R-PDCCH in the time domain.

When the basic logic unit of the R-PDCCH transmissions for specific RN is defined as R-CCE, the modulation scheme for determining to send for R-CCE according to the link-quality between eNB and RN.When modulation scheme is determined, set send a R-CCE needed for RE number and for the index for the OFDM symbol for sending R-PDCCH.It can implicitly be fixed for sending R-PDCCH one or more OFDM symbols, or OFDM symbol explicitly can be conveyed to RN by eNB.When OFDM symbol is explicitly conveyed to RN by eNB, eNB can be specifically worth by top signaling using RN conveys to RN by OFDM symbol.Or, eNB can use cell to be specifically worth in the form of the specific system information of cell and OFDM symbol is broadcast into all RN, or be specifically worth cell by top signaling and be sent to each RN.

R-CCE to RE mapping is carried out by unit of RB.RB bases can be RB to unit.Although eNB can explicitly by R-CCE size (i.e., RB or RB pairs of number) convey to each RN, but R-CCE size can implicitly be determined according to modulation scheme and the OFDM symbol used, and RN can implicitly know R-CCE size.RN can perform blind decoding based on R-CCE sizes and R-CCE aggregation levels.For example, when R-CCE size is 4 RB pairs, RN can perform blind search in units of four continuously RB couples.

Furthermore, it is possible to be each multiple search spaces of R-CCE polymeric configurations.In RB pairs of number needed for one R-CCE of transmission is determined, the search space according to R-CCE aggregation levels is set.RN is according to R-CCE aggregation levels with the RB sizes of space come each search space of blind search.

Can be according to each RN link-quality, using the R-CCE paradigmatic structures based on variable R-CCE sizes, rather than R-CCE paradigmatic structures based on the R-CCE sizes fixed to each RN.

R-CCE sizes can or cell specific search space specific depending on the RN for any RN.For example, in the case of for the specific search spaces 1 of RN1 RN, R-CCE sizes correspond to two RB pairs, and in the case of for the specific search spaces 2 of RN1 RN, R-CCE sizes correspond to three RB pairs.RN can perform blind search based on corresponding R-CCE sizes.A value can be fixed to for the R-CCE modulation orders sent.

R-CCE can include one group of continuous subcarrier in a frequency domain.Subcarrier can be distributed, or sub-carrier subset can be distributed, and the subcarrier for belonging to each subset is centralized.R-CCE can include the Searching point for being used to search for the specific information of RN, and may be used as being delivered to the unit of RN groups or all RN control information for detecting.Although for sending the R-CCE of the specific control information of RN and can have identical structure for the R-CCE that control information is delivered to RN groups and all RN, they preferably have different structures.

R-CCE base unit can be configured to such as 1/2RB to, 1/3RB to etc. RB pairs of total number of sub-carriers common divisor (for example, 12 common divisor) or a subcarrier.Furthermore, it is possible to combine the part RB of multiple RB centerings to constitute a R-CCE.

Search space from R-CCE can be defined as public search space or the specific search spaces of RN for a RN.The size of search space can depend on the number of the carrier wave used.R-CCE may be constructed such that only sends control information according to subcarrier by dedicated search space.DL is authorized and UL authorization messages can be encoded to generation code word respectively and is mapped to search space.Alternatively, DL is authorized and UL authorization messages can be jointly encoded only to generate a code word.

The embodiment of following proposal will be described, the program is fixed corresponding one or more OFDM symbols and to change RB pairs of number in a frequency domain to send R-PDCCH in the time domain, as described above.

Assuming that 16 quadrature amplitude modulations (QAM) are applied into RN1 as the R-PDCCH modulation schemes sent, and RN2 will be applied to for the modulation scheme that R-PDCCH is sent.R-PDCCH modulation schemes for RN are exemplary, and same modulation scheme can implicitly be applied to all RN.In addition, assuming that backhaul subframe uses routine CP, for RN1 and RN2, R-PDCCH is sent by the OFDM symbol with index 3,4,5 and 6, and Channel state indicators reference signal (CSI-RS) is not sent by the OFDM symbol with index 3,4,5 and 6.

Based on this it is assumed that being changed into 44 to the available RE numbers for sending R-PDCCH by a RB, therefore, 176 bit altogether can be sent for RN1, and 88 bits can be sent for RN2.

For RN1, if R-PDCCH is arranged to the R-CCE sizes corresponding to two RB pairs, then search space 1 is (for example, RB is to index 0 to 15) it is arranged to perform the blind search for polymerizeing 1 based on R-CCE, search space 2 is (for example, RB is to index 16 to 31) it is arranged to perform the blind search for polymerizeing 2 based on R-CCE, and search space 3 is (for example, RB is to index 32 to 63) it is arranged to perform the blind search for polymerizeing 4 based on R-CCE, 16/2=8 blind decoding operation is performed in search space 1, 16/4=4 blind decoding operation is performed in search space 2, and 32/8=4 blind decoding operation is performed in search space 3, to produce 16 blind decoding operations altogether.

For RN2, if R-PDCCH is arranged to the R-CCE sizes corresponding to four RB pairs, then search space 1 is (for example, RB is to index 16 to 31) it is arranged to perform the blind search for polymerizeing 1 based on R-CCE, search space 2 is (for example, RB is to index 32 to 63) it is arranged to perform the blind search for polymerizeing 2 based on R-CCE, and search space 3 is (for example, RB is to index 64 to 95) it is arranged to perform the blind search for polymerizeing 4 based on R-CCE, RN2 performs 16/4=4 blind decoding operation in search space 1, 32/8=4 blind decoding operation is performed in search space 2, and 32/16=2 blind decoding operation is performed in search space 3.

By the blind search scheme in another resource impact scheme for R-PDCCH transmissions that describes and the RN according to resource impact scheme.The alternative plan that RE is mapped to for sending the R-CCE of the R-PDCCH for any RN is fixed into RB number in a frequency domain and changes the number of OFDM symbol in the time domain.

In the case of Dynamic Resource Allocation for Multimedia, if described above in resource impact scheme 1, the basic logic unit of the R-PDCCH transmissions for RN is defined to R-CCE, then the modulation scheme sent for R-CCE is determined based on the link-quality between eNB and RN.After modulation scheme is determined, determining unit R-CCE send needed for RE number and send R-PDCCH via RB pairs of number.

By carry out R-CCE send institute via the numbers of one or more OFDM symbols for being used for R-CCE transmissions of RB centerings determine R-CCE aggregation levels.That is, when R-CCE aggregation levels are 1, an OFDM symbol is sent for R-CCE, and when R-CCE aggregation levels are 2, two OFDM symbols are sent for R-CCE, and when R-CCE aggregation levels are 3, three OFDM symbols are sent for R-CCE.

Multiple search spaces can be set for each R-CCE polymerizations.After the number of the VRB needed for one R-CCE of transmission is determined, the search space based on R-CCE aggregation levels is set.Search space can have identical RB positions.RN can be according to R-CCE aggregation levels with number blind search search space of the identical RB sizes of space based on OFDM symbol.

That is, RN can be based on an OFDM symbol to search space 1 and perform blind search, and two OFDM symbols execution blind searches are based on to search space 2.

By the blind search scheme in another resource impact scheme for R-PDCCH transmissions that describes and the RN according to the resource impact scheme.The third program that RE is mapped to for sending the R-CCE of the R-PDCCH for any RN is fixed to RB number and the number of fixed OFDM symbol, and change modulation scheme in the time domain in a frequency domain.

The different modulation schemes sent for R-PDCCH can be used for each search space.For example, for RN1, in the case of search space 1, eNB can send R-PDCCH based on QPSK schemes, and send R-PDCCH based on 16QAM schemes in the case of search space 2.

The R-CCE of R-PDCCH for configuring RN can use frequency domain and time domain to generate search space.That is, when the amount increase of control information, one or more OFDM symbols in time domain can be used to configure R-CCE.Furthermore, it is possible to which amount or frequency diversity based on information configure R-CCEs of multiple RB to upper restriction in a frequency domain.Above-mentioned extension in time domain/frequency domain, the search space based on R-CCE can be by crossing over one in the time domain and frequency domain base unit for being configurable for decoding R-PDCCH code words.In addition, search space can be divided into time domain/frequency domain corresponding to transmission control information (that is, DL is authorized, UL is authorized and ACK/NACK) number purpose region.

The mixed form of aforementioned four resource impact scheme can be used in the case of the Dynamic Resource Allocation for Multimedia sent for R-PDCCH.

It will be briefly described the form for the R-PDCCH that RN is sent to from eNB.Table 4 shows to be sent to RN R-PDCCH form from eNB.

[table 4]

R-PDCCH forms	Content
		R-PDCCH forms 0	Authorized for the UL that R-PUSCH is sent
The series of R-PDCCH forms 1 and 2	Authorized for the DL that R-PDSCH is sent
		The series of R-PDCCH forms 3	TPC (transmit power control) is ordered

R-PDCCH can be used different from the DCI format by the old-fashioned or LTE-AUE forms used.

Description eNB is sent to the situation of the R-PDCCH for RN1.When eNB sends multiple R-PDCCH for RN1, eNB can be multiplexed multiple R-PDCCH using continuous OFDM symbol in identical RB or RB couples according to pre-defined rule according to TDM schemes, and send the R-PDCCH of multiplexing.For example, when by four OFDM symbols (correspond to OFDM symbol and index 3,4,5 and 6) send a R-PDCCH of RB centerings in the first time slot when, the second time slot for passing through RB pairs sends the 2nd R-PDCCH.Here, the multiple R-PDCCH has different-format.For example, the multiple R-PDCCH form can include the R-PDCCH forms 1 and 2 for being used to send DL mandates, and for sending the R-PDCCH forms 0 of UL mandates, DL mandates are the control information needed for eNB sends data to RN, and UL mandates are the control information needed for RN sends data to eNB.DL is authorized and can be assigned to the first time slot and be sent, and UL is authorized and can be assigned to and continuous second time slot of the first time slot and be sent.Especially, DL mandates can be sent by indexing 3,4,5 and 6 four continuous OFDM symbols corresponding to OFDM symbol according to pre-defined rule, and UL is sent by seven continuous OFDM symbols corresponding to OFDM symbol index 7 to 13 according to pre-defined rule transmission and authorized.

When eNB sends multiple R-PDCCH to specific RN, RN can be appreciated that the RB for other R-PDCCH that RN is sent position with the one of R-PDCCH of blind search.That is, it is multiplexed in identical frequency by continuous OFDM symbol according to TDM schemes to the RN R-PDCCH sent and these R-PDCCH is sent to RN.

When RN detects a R-PDCCH, RN performs blind decoding to continuous OFDM symbol again.If RN is successfully received the additional R-PDCCH of other form by the blind decoding to continuous OFDM symbol, RN can the subsequent continuous OFDM symbol of blind decoding again.In addition, RN performs blind decoding until RN detects additional R-PDCCH failures from corresponding RB centerings.

For RN1, assuming that performing R-PDCCH blind searches to the OFDM symbol with index 3,4,5 and 6, to search for a search space (RB indexes 0 to 31) corresponding to 2 RB pairs of R-CCE sizes, DL is sent to authorize and UL mandates, and by corresponding only to the OFDM symbol that OFDM symbol indexes 3,4,5 and 6 with blind search in index RB pairs of 0 to 31, authorized from the RB corresponding to index 24 to being successfully detected DL.Due to being authorized from the RB with index 24 to being successfully detected DL, therefore, RN1 further can perform blind decoding to the OFDM symbol with index 7 to 13, in order to the additional R-PDCCH for checking for therefore sending, another RB of the RB centerings with index 24 should be corresponded to the OFDM symbol for indexing 7 to 13.In this case, after UL mandates are detected during successfully there is the OFDM symbol for indexing 7 to 13 from RB pairs with index 24, RN1 can confirm additional R-PDCCH is not present with the next RB of blind decoding to (that is, RB to) with index 25.

Have been described in continuous RB according to the multiple R-PDCCH of TDM schemes distribution and situation about being transmitted.Similarly, it may be considered that the method for distributing multiple R-PDCCH according to FDM schemes by continuous RB.

With reference to Fig. 7, equipment 50 can be UE, eNB or RN.Equipment 50 includes processor 51, memory 52, radio frequency unit (RF units) 53, display unit 54 and user interface section 55.

Implement radio interface protocol layer in processor 51.Processor 51 provides chain of command and user plane.The function of each layer can be implemented in processor 51.Memory 52 is connected to processor 51 and storage program area, application program and general file.

The display information of display unit 54, and the well known elements such as liquid crystal display (LCD), Organic Light Emitting Diode (OLED) can be used.

User interface section 55 can be constructed according to the form of user interface known to keyboard, touch-screen etc..

RF units 53 be connected to processor 51 and send/receive wireless signal.RF units 53 are divided into processor sending module (not shown) and receiving module (not shown).

Radio interface protocol layer between UE and network can be divided into first layer L1, second layer L2 and third layer L3 based on lower three layers of known open system interconnection (OSI) in communication system.Physical layer belongs to first layer and provides information transfer service by physical channel.Wireless heterogeneous networks (RRC) layer belongs to third layer and provides the Radio Resource between UE and network.UE and network exchange RRC information by rrc layer.

The embodiment of invention described below is element and the combination of feature of the present invention.Feature or element can be considered as it is selective, unless otherwise indicated.Each element or feature can be with not implemented in the case of other elements or combinations of features.Furthermore, it is possible to construct embodiments of the present invention by built-up section element and/or feature.Operation order described in embodiments of the present invention can be reset.Some constructions of any embodiment can be included in another embodiment and may alternatively be the correspondence construction of another embodiment.It will be apparent to one skilled in the art that there is no the claim clearly quoted each other to be included as new claim by subsequent modification as embodiments of the present invention or after the application submission in combination in appended claims.

It can be realized according to the embodiment of the present invention by various means, for example, can be realized by hardware, firmware, software or its combination.In hardware construction, embodiments of the present invention can be realized by one or more application specific integrated circuits (ASIC), digital signal processor (DSP), digital signal processing device (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, microcontroller, microprocessor etc..

In firmware or software construction, embodiments of the present invention can be implemented by execution above-mentioned functions or a kind of module of operation, process, function.Software code can be stored in a memory cell and then by computing device.Memory cell can be located at processor either internally or externally with by various known devices transmit data to processor and from processor receive data.

Those skilled in the art will be appreciated that in the case of the spiritual and basic special type without departing from the present invention, the present invention can be implemented with other particular forms in addition in the form of illustrating here.Therefore foregoing description is appreciated that exemplary rather than restricted in all respects.All changes that the scope of the present invention should be determined by the reasonable dismissal of appended claims and fallen into the equivalency range of the present invention are intended to be included in the scope of the present invention.

Industrial applicibility

It can apply to include 3GPP LTE, LTE-A, IEEE 802 etc. various GSMs for sending and receiving the apparatus and method of the control information for RN.

Claims

1. one kind is used for the method for sending the control information for via node (RN) at eNode B (eNB) place in a wireless communication system, it the described method comprises the following steps：

Multiple relaying physical downlink control channels (R-PDCCH) for sending the control information to the via node are sent,

Wherein, the R-PDCCH is re-used according to time division multiplexing (TDM) scheme, and is sent according to pre-defined rule by multiple continuous OFDM (OFDM) symbols in same resource block (RB).

2. the method for claim 1, wherein the R-PDCCH is assigned to different RB or time slot and sent.

3. method as claimed in claim 2, wherein, the R-PDCCH has different transformats.

4. method as claimed in claim 3, wherein, the first R-PDCCH in the multiple R-PDCCH is authorized including DL, the DL mandates are the control information needed for the eNB sends data to the via node, the 2nd R-PDCCH in the multiple R-PDCCH is authorized including UL, the UL mandates are the control information needed for the via node sends data to the eNB, first PDCCH is assigned to the first RB and sent, and the 2nd PDCCH is assigned to and continuous 2nd RB of the first RB and sent.

5. method as claimed in claim 4, wherein, the DL authorizes by having OFDM symbol to index 3,4,5 and 6 OFDM symbol in the first RB to send, and the UL authorizes by having OFDM symbol to index 7 to 13 OFDM symbol in the 2nd RB to send.

6. one kind is used to send the eNode B (eNB) for the control information of via node (RN) in a wireless communication system, the eNB includes：

Sending module, the sending module is configured to send the multiple R-PDCCH for being used for sending the control information to the via node,

Wherein, the R-PDCCH is re-used according to time division multiplexing (TDM) scheme, and is sent according to pre-defined rule by multiple continuous OFDM symbols in same RB.

7. eNB as claimed in claim 6, wherein, the R-PDCCH is assigned to different RB or time slot and sent.

8. eNB as claimed in claim 7, wherein, the R-PDCCH has different transformats.

9. eNB as claimed in claim 8, wherein, the first R-PDCCH in the multiple R-PDCCH is authorized including DL, the DL mandates are the control information needed for the eNB sends data to the via node, the 2nd R-PDCCH in the multiple R-PDCCH is authorized including UL, the UL mandates are the control information needed for the via node sends data to the eNB, first PDCCH is assigned to the first RB and sent, and the 2nd PDCCH is assigned to the 2nd RB and sent.

10. eNB as claimed in claim 9, wherein, the DL is authorized to be sent by the OFDM symbol that in the first RB there is OFDM symbol to index 3,4,5 and 6, and the UL is authorized and sent by the OFDM symbol that in the 2nd RB there is OFDM symbol to index 7 to 13.

11. one kind is used for the method for receiving the control information for the RN at via node (RN) place in a wireless communication system, it the described method comprises the following steps：

The information for the RB that should be searched on the via node is received by top signaling from eNB, to receive the control information；

At least one RB that should be searched by blind decoding from the first RB detects the control information；And

The control information detected is received from the eNB by the first RB.

12. method as claimed in claim 11, methods described further comprises the steps：

If detecting the control information from the first RB, the control information is detected from continuous 2nd RB of the first RB；And

The control information detected from the 2nd RB is received from the eNB.

13. method as claimed in claim 12, wherein, the control information in the first RB and the 2nd RB by being sent for sending the R-PDCCH of the control information for the via node, and

Wherein, the R-PDCCH is re-used in the first RB and the 2nd RB according to time division multiplexing (TDM) scheme, and is sent according to pre-defined rule by continuous OFDM symbol in the first RB and the 2nd RB.

14. method as claimed in claim 13, wherein, the R-PDCCH is assigned to different RB or time slot and sent.

15. method as claimed in claim 14, wherein, the R-PDCCH has different transformats.

16. method as claimed in claim 15, wherein, authorized by the first RB R-PDCCH sent including DL, the DL mandates are the control information needed for the eNB sends data to the via node, and the R-PDCCH sent by the 2nd RB is authorized including UL, the UL mandates are the control information needed for the via node sends data to the eNB.

17. method as claimed in claim 16, wherein, the DL authorizes by having OFDM symbol to index 3,4,5 and 6 OFDM symbol in the first RB to send, and the UL authorizes by having OFDM symbol to index 7 to 13 OFDM symbol in the 2nd RB to send.

18. a kind of via node (RN) for being used to receive control information in a wireless communication system, the RN includes：

Receiving module, the receiving module is configured to receive the information for the RB that should be searched on the via node by top signaling from eNB, to receive the control information；And

Processor, the processor is configured at least one RB that should be searched by blind decoding to detect the control information from the first RB,

Wherein, the receiving module is configured to receive the control information detected by the processor from the eNB by the first RB.

19. RN as claimed in claim 18, wherein, if detecting the control information from the first RB, the processor detects the control information from continuous 2nd RB of the first RB；

Wherein, the receiving module receives the control information detected from the 2nd RB from the eNB.

20. RN as claimed in claim 19, wherein, the control information in the first RB and the 2nd RB by being sent for sending the R-PDCCH of the control information for the via node, and

21. RN as claimed in claim 20, wherein, the R-PDCCH is assigned to different RB or time slot and sent.

22. RN as claimed in claim 21, wherein, the R-PDCCH has different transformats.

23. RN as claimed in claim 22, wherein, authorized by the first RB R-PDCCH sent including DL, the DL mandates are the control information needed for the eNB sends data to the via node, and the R-PDCCH sent by the 2nd RB is authorized including UL, the UL mandates are the control information needed for the via node sends data to the eNB.

24. RN as claimed in claim 23, wherein, the DL authorizes by having OFDM symbol to index 3,4,5 and 6 OFDM symbol in the first RB to send, and the UL authorizes by having OFDM symbol to index 7 to 13 OFDM symbol in the 2nd RB to send.