CN103326835B - Wireless communication system and its method, wireless terminal device, radio base station apparatus - Google Patents

Abstract

The invention provides wireless communication system and its method, wireless terminal device, radio base station apparatus.In the dispensing device of service eNB sides, the 1st packet transmission portion performs the action for sending retransmitted data packet.On the other hand, in the dispensing device of cooperation eNB sides, the 2nd packet transmission portion perform send with by being grouped transfering department from the action of the corresponding new data packet of the information of service eNB transfers.The control information of eNB and cooperation eNB for UE communication is serviced, is communicated using only the PUCCH that eNB is serviced from UE directions and from service eNB towards UE PDCCH.Service eNB and cooperation eNB carries out the communication of new data packet and communication control information etc. using X2 interface.

Description

Wireless communication system and its method, wireless terminal device, radio base station apparatus

The application is original bill Application No. No.200880131655.5 application for a patent for invention（International application no：PCT/ JP2008/003080, the applying date：On October 28th, 2008, denomination of invention：The wireless base station of cooperation HARQ communication modes is used Device, wireless terminal device, wireless communication system and wireless communications method）Divisional application.

Technical field

The present invention relates to the cooperation sending method technology for having used spaced antenna.As packet communication techniques, for example, wrap Containing the E-UTRA studied as portable phone telecommunications metrics of future generation（Evolved Universal Terrestrial Radio Access：Evolved universal terrestrial wireless access）The communication technology.

Background technology

In spread spectrum code division multiple access（Code Division Multiple Access）In, it is extensively studied following soft cut Change technology：When mobile terminal is moved to the cell on side from a cell, it can receive and dispatch same simultaneously between two base stations Signal so that communication is not interrupted.As the prior art relevant with cooperation transmission, for example, disclose patent document 1 or following non- Mode described in the grade of patent document 1.At these in the prior art, the cooperation sender of link capacity can be increased by disclosing Formula.

Based on same consideration, with the multiple-input and multiple-output corresponding to macroscopic view decay（MIMO：Multi-Input and Multi-Output）Technology relatively proposes to have used the cooperation sending method of spaced antenna of the configuration on different base station. As the prior art for being combined with MIMO technology and cooperation transmission technology, for example, disclose and remember in following non-patent literatures 2~6 The mode of load.The purpose of these modes is, realizes macro-diversity effect and MIMO effects this both sides.

The words relevant on the macro-diversity with being sent with cooperation, such as by standardisation bodies 3GPP（3rd Generation Partnership Project：Third generation partner program）The LTE of standardized work is carried out（Long Term Evolution：Long Term Evolution）Deng, the projects of new portable phone telecommunications metrics formulate in also have research.These grind Study carefully for example disclosed in following non-patent literatures 7.But, due to be difficult by high-rise data distribution initially to different base stations, Therefore employ and do not realize that cooperation is sent, in order that installing mode simple and that data are only distributed to a base station.

In recent years, it is for fourth-generation system as the LTE evolution standards of LTE specification of future generation（4G）And develop. In the standard, particularly with downlink（DL）And up-link（UL）The relevant system performance requirements of frequency efficiency In, set very positive target.Specific words related to this, such as disclosed in following non-patent literatures 8.

In order to realize such target, enterprise carries for beamforming transmission, intra-cell interference control and relay and control Several beneficial schemes are gone out.Wherein, in order to rethink its possibility installed, propose again relevant with cooperation transmission Argument.Specifically, for example disclosed in following non-patent literatures 9 or 10.In LTE evolution, it is aimed at, logical with LTE Believe that the situation in the release8 of specification is compared, the target of the handling capacity of the user at cell end is essentially become 1.4 times.Work as consideration These when, expect will cooperation sending method be used as the main candidate in LTE evolution technologies.

In the next generation communication specification of LTE evolution etc., before using cooperation transmission technology, existing much needs clarification Argument.E.g. following research：Data and control channel, transmission timing between the eNode-B of X2 interface, user Packet scheduling and hybrid automatic repeat-request（HARQ：Hybrid Automatic Repeat reQuest）Processing etc..Wherein Most important one is the research relevant with HARQ.

In LTE communication specification etc., it is desirable to be able to carry out the packet communication techniques of high-speed communication in mobile body terminal.Dividing In group communication, according to the error correcting code being attached to by dispensing device in communication packet, reception device carries out error detection while receiving The communication information.Then, reception device regard the reception success or not of communication packet as ACK（That affirms is sent to confirmation： ACKnowledgement）Or NAK（That negates is sent to confirmation）Return to dispensing device.Dispensing device is returned in reception device It could not be received untill passing through appropriate a period of time in the case of NAK or after transmission packet in the case of being sent to confirmation, Retransmit and send information.

In the HARQ technologies used in LTE etc., in the processing of the protocol layer of layer 1 such as in LTE, reception is being considered Device does not abandon the data of decoding failure and combines on the basis of being decoded, to determine the weight of dispensing device side with re-transmission data Arq mode.Then, in reception device side, the data of reception failure are not abandoned and combine to be decoded with re-transmission data.Thus, Realize high efficiency and high-precision Retransmission control.

Therefore, in packet communication mode of future generation, in order to realize the cooperation sending method of diversity greatly, in cooperation hair Send and the problem of HARQ turns into maximum how is realized in mode.

But, it is not disclosed in association disclosed in as patent document 1 or the grade of non-patent literature 1~10 in the prior art It is used for the specific technology for realizing HARQ in sending.

In addition, as the prior art for combining HARQ with MIMO technology, disclosing described in following patent documents 2 Mode.Mentioned in patent document 2 in the packet transmission of MIMO multiplexing transmission antennas has been used, the specific side for realizing HARQ Formula.

But, it is that multiple antennas are received into a base station as premise relative to MIMO, cooperation transmission is to make scattered match somebody with somebody The antenna cooperative for the multiple base stations put carries out the transmission in the downlink direction towards mobile terminal as premise.In order to divide Cooperation of the realization comprising HARQ sends user data and control channel number, it is necessary between solving base station between dissipating the base station of configuration According to receiving delivery system and timing wait in MIMO not turn into object the problem of.Particularly, on how by the new data in HARQ Packet and retransmitted data packet are sent with cooperation to be combined, above-mentioned not disclose in the prior art, but residual is asking for should solving Topic.

Patent document 1：Japanese Unexamined Patent Application Publication 2008-503974 publications

Patent document 2：Japanese Unexamined Patent Application Publication 2008-517484 publications

Non-patent literature 1：A.J.Viterbi,A.M.Viterbi,K.S.Gilhousen,and E.Zehavi,“Soft handoff extends CDMA cell coverage and increases reverse link capacity”,IEEE J.Sel.Areas Commun.,vol.12,pp.1281-1288,October,1994.

Non-patent literature 2：W.Roh and A.Paulraj,“MIMO channel capacity for the distributed antenna systems”,in IEEE VTC’02,vol.3,pp.1520-1524,Sept.2002.

Non-patent literature 3：Z.Ni and D.Li,“Impact of fading correlation and power allocation on capacity of distributed MIMO”,IEEE Emerging Technologies: Frontiers of Mobile and Wireless Communication,2004,Volume2,May31-June2, 2004Page(s):697-700Vol.2.

Non-patent literature 4：Syed A.Jafar,and S.Shamai,“Degrees of freedom region for The MIMO X Channel ", IEEE Transactions on Information Theory, Vol.54.No.1, pp.151-170,January2008,.

Non-patent literature 5：D.Wang,X.You,J.Wang,Y.Wang,and X.Hou,“Spectral Efficiency of Distributed MIMO Cellular Systems in a Composite Fading Channel”,IEEE International Conference on,Communications,2008.ICC’08,pp.1259-1264,May19-23, 2008.

Non-patent literature 6：O.Simeone,O.Somekh,;H.V.Poor,and S.Shamai,“Distributed MIMO in multi-cell wireless systems via finite-capacity links”, Communications,Control and Signal Processing,2008.ISCCSP2008.3rd International Symposium on,pp.203-206,March12-14,2008.

Non-patent literature 7：3GPP TR25.814v7.0.0,Physical layer aspects for evolved UTRA,release-7,June2006.

Non-patent literature 8：3GPP TR36.913v7.0.0,Requirements for Further Advancements for E-UTRA,release-8,V8.0.0,June2008.

Non-patent literature 9：3GPP TSG RAN WG1Meeting#53bis Warsaw,Poland, “Collaborative MIMO for LTE-A downlink”,June30-July4,2008,R1-082501.

Non-patent literature 10：3GPP TSG RAN WG1Meeting#53bis Warsaw,Poland,“Network MIMO Precoding”,June30-July4,2008,R1-082497.

The content of the invention

The problem of the present invention is, appropriate and efficient HARQ processing is realized in cooperation sending method.

The mode illustrated below with wireless communication system or belong to the system radio base station apparatus or wireless terminal device, Premised on the wireless communications method for realizing its processing, the wireless communication system solves to not be discarded in the wireless terminal device Code failure packet and decoded with the packet assembling of re-transmission, be sent to confirmation letter according to what is returned from wireless terminal device Breath, the re-transmission that one side control packet is sent, while making the 1st radio base station apparatus and the 2nd radio base station apparatus fill wireless terminal Put execution cooperation transmission processing.

When 1st packet transmission portion produces the repeat requests for cooperation transmission processing in wireless terminal device, from the 1st nothing Line base station apparatus sends any the one of new data packet or retransmitted data packet corresponding with repeat requests to wireless terminal device 1st packet of side.

Transfering department is grouped when producing repeat requests, new number is transferred from the 1st radio base station apparatus to the 2nd radio base station apparatus According to the relevant information of the 2nd packet different from the 1st packet in packet or retransmitted data packet.Packet transfering department example as used in X2 interface is handled to perform transfer as defined between 1st radio base station apparatus and the 2nd radio base station apparatus.

, according to the information transferred from packet transfering department, sent out when producing repeat requests with the 1st packet in 2nd packet transmission portion Send the 1st of the portion transmission processing being grouped synchronously to send the 2nd from the 2nd radio base station apparatus to wireless terminal device to be grouped.

In the structure of aforesaid way, the 1st radio base station apparatus and the 2nd radio base station apparatus have re-transmission buffers respectively Portion, the 1st radio base station apparatus can be configured to：The relevant information that cooperation sends the packet of processing will be carried out to wireless terminal device It is maintained in the re-transmission buffers portion in the 1st radio base station apparatus, the 2nd radio base station apparatus can be configured to：Will not be to wireless The relevant information for the packet that terminal installation progress cooperation sends processing is maintained at the re-transmission buffers portion in the 2nd radio base station apparatus In.

It can be configured in the structure of aforesaid way：1st packet is retransmitted data packet, and the 2nd packet is new data point Group.Now, packet transfering department reads the correlation of retransmitted data packet for example from the re-transmission buffers portion in the 1st radio base station apparatus Information, and it is transferred to the 2nd radio base station apparatus.In addition, packet transfering department is for example transferred in the 1st radio base station apparatus and wireless end The communication control information associated with the 2nd radio base station apparatus that is communicated between end device and filled with the 2nd wireless base station The information that the transmission timing for the 2nd packet put is associated.

In the structure of mode untill more than, the wireless communication system according to invention 6 or 7 msy be also constructed to： Further include control information communication unit, the control information communication unit between the 1st radio base station apparatus and wireless terminal device, 1st radio base station apparatus is directed to for the control information and the 2nd radio base station apparatus of the communication of wireless terminal device wireless whole The control information of the communication of end device is communicated.The control information communication unit is for example held via physical downlink control channel Transmission of the row from the 1st radio base station apparatus to the control information of wireless terminal device, holds via physical uplink control channel The transmission gone from wireless terminal device to the control information of the 1st radio base station apparatus.Physical uplink control channel now For example, at least comprising respectively for the 1st wireless base station radio base station apparatus and the respective channel quality of the 2nd radio base station apparatus Configured information and the 1st radio base station apparatus and the 2nd radio base station apparatus public pre-coding matrix instruction information and order instruction Information.In addition, physical downlink control channel is for example, at least comprising respectively for the 1st radio base station apparatus and the 2nd wireless base The respective modulation coding mode information and precoding information of station arrangement.

In the structure of mode untill more than, from wireless terminal device to the control information energy of the 1st radio base station apparatus Enough it is configured to：Comprising the reception result for representing the packet from the 1st radio base station apparatus respectively and from the 2nd radio base station apparatus The reception result of packet be sent to confirmation（HARQ-ACK/NAK）.

In the structure of mode untill more than, the 1st radio base station apparatus can be configured at least centralized Control：With cooperating Send the associated distribution of wireless terminal device of processing, the distribution of the communication resource and the control for sending timing.

The wireless terminal device communicated by the wireless communication system of the structure with aforesaid way has following Mode.

Retransmitted data packet acceptance division performs the reception processing of retransmitted data packet when producing repeat requests.

New data packet acceptance division the retransmitted data packet of the retransmitted data packet acceptance division reception processing success when, The reception signal received by the successful retransmitted data packet of the reception processing to wireless terminal device performs gradually interference and disappeared The reception processing that signal performs new data packet is received except processing, and according to what is obtained as its result.

In the structure of the mode of the wireless terminal device, it can be configured to further send processing determination comprising cooperation Portion, the cooperation sends processing determining section and determines whether to perform cooperation transmission processing, and is being defined as performing at the cooperation transmission During reason, it is determined that carrying out the 1st radio base station apparatus and the 2nd radio base station apparatus of the execution.The cooperation sends processing determining section example As determined according to the information related to the receiving power of the contrast signal from each radio base station apparatus reception in present communications.

Brief description of the drawings

Fig. 1 is explanation figure of the embodiment as the network model of premise.

Fig. 2 is the structure chart of the embodiment of dispensing device.

Fig. 3 is the structure chart of the embodiment of reception device.

Fig. 4 is the explanation figure for being divided to situation to illustrate two eNode-B cooperative actions.

Fig. 5 is the explanation figure of the coordination downlink link HARQ sending methods for scheme 2.

Fig. 6 is the explanation figure of the coordination downlink link HARQ sending methods for scheme 3.

Fig. 7 is the action sequence legend for representing to service eNB and the eNB that cooperates determination processing.

Fig. 8 is data channel and the explanation figure of control channel.

Fig. 9 is the figure for the data format example for representing UCI and DCI.

Figure 10 is the figure for the example for representing the transmission timing between control channel and data channel.

Figure 11 is the BLER for representing each UE for initially sending, retransmitting #1, #2, #3 in simulation result to geometry （BLER vs.Geometry）Curve map.

Figure 12 be represent SIC in simulation result with/without it is respective in the case of for service eNB and cooperation eNB SINR CDF curve map.

Figure 13 is the curve map for representing to service the probability in the link gap between eNB and cooperation eNB.

Figure 14 is to represent the SINR between service eNB and cooperation eNB of the SIC with/without in the case of when CDF points are 0.5 To link gap（SINR vs.Link Gap）Curve map.

Figure 15 be represent between service eNB when CDF points are 0.5 and cooperation eNB by cancelling caused gain to link Gap（SINR Gain vs.Link Gap）Curve map.

Embodiment

Hereinafter, it is explained in detail with reference to the accompanying drawings preferred embodiment.

First, embodiment is illustrated as the grid model of premise.

Fig. 1 is explanation figure of the embodiment as the network model of premise.

In order to not lose generality, network is configured to packet communication system, and the packet communication system includes portable to some The mobile radio terminals such as telephone terminal（UE：User Equipment）Two wireless base stations collaboratively serviced.Packet is logical Letter system can for example be used as the E-UTRA in the LTE communication specification that standardized work has been carried out by 3GPP（Evolved Universal Terrestrial Radio Access）System is realized.

In LTE etc., base station is referred to as eNode-B（evolved Node B）.Present embodiment in the following description, Base station is expressed as to eNode-B or the eNB for omitting statement is used as.

As shown in figure 1, one in two wireless base stations is expressed as serving BS：Serving eNode-B（Hereinafter, it is simple Referred to as " service eNB " or " S-eNB "）, another is expressed as cooperative base station：Collaborative eNode-B（Below according to need Will, referred to as " cooperate eNB " or " C-eNB "）.ENB belongs to which of service eNB and cooperation eNB, is received based on each UE Long term power strength is determined.It therefore, it can make the positioning for each UE eNB different.As rational definition, each UE connects The long term power strength from service eNB received is higher than the long term power strength from cooperation eNB.

Fig. 2 is the structure of the embodiment of the packet transmission device constituted in the eNode-B on the network shown in Fig. 1 Figure.In addition, Fig. 3 is the structure chart of the embodiment of the packet receiver unit constituted in Fig. 1 UE.Fig. 2 dispensing device dress For in eNode-B downlink side, Fig. 2 reception device is equipped in UE downlink side.Further, since both is up The structure of the R-T unit of link channel side is general structure, therefore is omitted.

Dispensing device shown in Fig. 2 is included：New data packet sending part 201, retransmitted data packet sending part 202, channel Dispenser 203, modulation portion 204, wireless processing section 205, transmission control unit 206, uplink control channel reception portion 207 and X2 control channels receiving and transmitting part 208.New data packet sending part 201 is further by block generating unit 201-1, new portion acquisition unit 201- 2nd, new data packet coding unit 201-3 is constituted.Retransmitted data packet sending part 202 is further by re-transmission buffers portion 202-1, re-transmission Part acquisition unit 202-2 and retransmitted data packet coding unit 202-3 is constituted.

Reception device shown in Fig. 3 is included：Wireless processing section 301, retransmitted data packet acceptance division 302, new data packet Acceptance division 303, reception control unit 304, uplink control channel sending part 305.Retransmitted data packet acceptance division 302 is further By retransmitted data packet demodulation section 302-1, re-transmission buffers portion 302-2, retransmit partially synthetic portion 302-3, retransmitted data packet solution Code portion 302-4 and output dispenser 302-5 are constituted.New data packet acceptance division 303 is further rearranged by retransmitted data packet Code portion 303-1, retransmitted data packet remodulates portion 303-2, elimination portion 303-3, new data packet demodulation section 303-4 and new number Constituted according to packet decoding portion 303-5.

Hereinafter, the action to dispensing device and the embodiment of reception device with above structure is described in detail.

As for very important feature exclusive HARQ, there is point as described below：Closed by Fig. 2 re-transmission part After combining processing into the HARQ that portion 305-3 is performed, Block Error Rate when retransmitted data packet is decoded is usually less than 1%.In Fig. 2 In shown embodiment, the gradually interference that 303-3 is performed in elimination portion is eliminated（SIC：Successive Interference Cancellation）In processing, by the way that decoded retransmitted data packet is positively utilized, efficient SIC processing is realized.I.e., In Fig. 2 embodiment, acted in such a way in UE：Retransmission detection is grouped first, then detects other points Group（New packet retransmits packet）.

Then, in the present embodiment, respectively from two associations of the dispensing device for being mounted with downlink class shown in Fig. 1 The eNode-B that work is acted, issues a new packet to UE Complete Synchronization and one retransmits and is grouped.

Fig. 4 is the explanation figure for being divided to situation to represent two eNode-B cooperative actions.Herein, cooperation transmission is categorized as 4 types Scheme.It is different channel resource allocations in each scheme, and is different control channel designs.For simplicity, Although explanation herein is only single UE situations, the scheme for multiple UE will be described later.

In Fig. 4（a）In shown scheme 1, it is assumed that only new data packet is published to positioned at cell end from service eNB UE.In order to collaboratively realize macroscopical transmission, some new data packets are transferred to cooperation eNB via X2 interface from service eNB.So Afterwards, these new data packets are published to corresponding UE simultaneously from the eNode-B of both sides.In UE sides, suppressing what is interfered Meanwhile, carry out reception processing.

In Fig. 4（b）In shown scheme 2, it is assumed that the transmission packet of two types is distributed to the UE positioned at cell end.One Individual is retransmitted data packet, and another is new data packet.Retransmitted data packet is to be transferred via X2 interface from service eNB New data packet from cooperation eNB be published to UE while, from service eNB be published to UE.In UE, as described later, shown in Fig. 3 New data packet acceptance division 303 while suppressing to interfere, carries out reception processing by SIC processing.

In Fig. 4（c）In shown scheme 3, retransmitted data packet and new data packet are issued in the same manner as the situation of scheme 2 The transmission packet of the two types.Different from scheme 2 in scheme 3, new data packet is from cooperation in retransmitted data packet While eNB is published to UE, UE is published to from service eNB.In this case, retransmitted data packet via X2 interface from service eNB It is transferred to cooperation eNB.In UE, as described later, the new data packet acceptance division 303 shown in Fig. 3 is being suppressed by SIC processing While interfering, reception processing is carried out.

In Fig. 4（d）In shown scheme 4, it is assumed that only retransmitted data packet is published to positioned at cell end from service eNB UE.In order to collaboratively realize macroscopical transmission, several retransmitted data packets are transferred to cooperation eNB via X2 interface from service eNB.So Afterwards, these retransmitted data packets are published to corresponding UE simultaneously from the eNB of both sides.In UE sides, suppress interfere it is same When, carry out reception processing.

Herein, Fig. 4（b）Scheme 2 and Fig. 4（c）Scheme 3 can be described as providing the highest diversity of macroscopical transmission antenna The preferred sending method of the cancellation gain of gain and SIC processing.Because, due to being combined for HARQ after re-transmission number According to the BLER of packet（Block Error Rate：Block Error Rate）It is sufficiently low, therefore by initially extracting retransmitted data packet, then out New data packet is extracted out by SIC processing, good result can be obtained.Therefore, the rule sent as cooperation, preferably all the time A new data packet and a retransmitted data packet are obtained, these packets are sent simultaneously from service eNB and cooperation eNB both sides Mode.According to system integration project result described later, if UE is moved with speed per hour 3km speed, understand the probability retransmitted be 8~ 10%.But, in the movement of speed per hour 30km speed, the probability of re-transmission increases to 70~80%.Therefore, it is possible to estimate with difference The retransmission probability when set of terminal of speed movement is mixed probably is 30~40%.As a result, new data packet and re-transmission data The possibility that cooperation HARQ between packet is sent is 23~29%.It may be said that being sent as without the common cooperation retransmitted, adopt Use Fig. 4（a）The probability of shown scheme 1 is 70% or so.But, because the generation probability that HARQ is grouped is low, therefore in reality Fig. 4 will not be produced in system（d）Shown scheme 4.Therefore, it is almost zero using the probability of scheme 4.

Studied more than, as the action of the eNode-B downlink class dispensing devices shown in Fig. 2, stress Fig. 4 （b）Shown scheme 2 and Fig. 4（c）The situation of shown scheme 3.These schemes are to select any one to be set when mounted Meter.Which scheme is more suitable for, and will be described later.

Fig. 5 is the explanation figure of the coordination downlink link HARQ sending methods of scheme 2.

First, in Fig. 5（b）In, if the new data packet that UE is received（Such as #0 new data packet）Produce mistake, Then the data with from the eNB that cooperates（C-eNB）The new packet of issue（Such as #12 new data packet）Meanwhile, by servicing eNB （S-eNB）What is determined makes its synchronous transmission timing, is retransmitted from service eNB.Same processing with #17（Or #15）New number The #4 sent together according to packet（Or #11）Re-transmission packet etc. in also produce.

Fig. 5（a）It is the block diagram of the processing structure of the dispensing device of the scheme that represents 2.Service is used as in Fig. 2 dispensing device The downlink class of eNB sides is come in the case of installing, Fig. 5（a）The re-transmission buffers portion 504 and Fig. 2 re-transmissions of service eNB sides delay Rush portion 202-1 correspondences.In addition, in the 1st packet transmission portion 501 and Fig. 2 of service eNB sides retransmitted data packet sending part 202 Remove re-transmission buffers portion 202-1 part correspondence.And then, the RF503 of service eNB sides is equivalent to the channel allocation unit by Fig. 2 203rd, the part that modulation portion 204 and wireless processing section 205 are constituted.On the other hand, it is used as cooperation eNB in Fig. 2 dispensing device The downlink class of side is come in the case of installing, Fig. 5（a）Cooperation eNB sides the 2nd packet transmission portion 503 and Fig. 2 new data The correspondence of packet transmission portion 201.In addition, the RF505 of cooperation eNB sides equivalent to the channel allocation unit 203 by Fig. 2, modulation portion 204 with And the part that wireless processing section 205 is constituted.And then, the packet transfering department of new data packet is transferred from service eNB to cooperation eNB 502 is corresponding with Fig. 2 X2 control channels receiving and transmitting part 108.

From the processing structure it is understood that in the service eNB respectively with the downlink class dispensing device shown in Fig. 2 and association In the case of making eNB according to the action of scheme 2, in the dispensing device of service eNB sides, perform the 1st packet transmission portion 501 and send weight Pass the action of packet 507.On the other hand, in the dispensing device of cooperation eNB sides, the 2nd packet transmission portion 503 performs transmission The action of new data packet 508, the new data packet 508 with by be grouped transfering department 502 from service eNB transfer information pair Should.

Fig. 6 is the explanation figure of the coordination downlink link HARQ sending methods of scheme 3.

First in Fig. 6（b）In, if the new data packet that UE is received（Such as #0 new data packet）Produce mistake, Then the data are transferred to cooperation eNB via X2 interface using corresponding control channel.On this basis, with from service eNB The new packet of issue（Such as #4 new data packet）Meanwhile, make its synchronous transmission timing what is determined by service eNB, from association Make eNB re-transmissions.Same processing with #9（Or #7）The #5 that sends together of new data packet（Or #14）Re-transmission packet etc. in Also produce.

Fig. 6（a）It is the block diagram of the processing structure of the dispensing device of the scheme that represents 3.Service is used as in Fig. 2 dispensing device The downlink class of eNB sides is come in the case of installing, Fig. 6（a）The re-transmission buffers portion 604 and Fig. 2 re-transmissions of service eNB sides delay Rush portion 202-1 correspondences.In addition, the 1st packet transmission portion 601 of service eNB sides is corresponding with Fig. 2 new data packet sending part 201. And then, the RF603 of service eNB sides is equivalent to by Fig. 2 channel allocation unit 203, modulation portion 204 and the structure of wireless processing section 205 Into part.On the other hand, Fig. 2 dispensing device as the downlink class of cooperation eNB sides come in the case of installing, Fig. 6 （a）Cooperation eNB sides the 2nd packet transmission portion 603 with removing re-transmission buffers portion in Fig. 2 retransmitted data packet sending part 202 202-1 part correspondence.In addition, the RF605 of cooperation eNB sides equivalent to by Fig. 2 channel allocation unit 203, modulation portion 204 and The part that wireless processing section 205 is constituted.And then, transferred from the re-transmission buffers portion 604 in service eNB to cooperation eNB and retransmit data The packet transfering department 602 of packet is corresponding with Fig. 2 X2 control channels receiving and transmitting part 108.

From the processing structure be appreciated that respectively have Fig. 2 shown in downlink class dispensing device service eNB and In the case that the eNB that cooperates is acted according to scheme 3, in the dispensing device of service eNB sides, the 1st packet transmission portion 601 of execution is sent The action of new data packet 607.On the other hand, in the dispensing device of cooperation eNB sides, the 2nd packet transmission portion 603 performs transmission The action of retransmitted data packet 608, the retransmitted data packet 608 by being grouped transfering department 502 from the re-transmission in service eNB with being delayed Rush the information correspondence of the transfer of portion 604.

On overall complexity, scheme 2 is more suitable for than scheme 3.Because, in scheme 2, cooperation eNB receives warp The new block transferred by X2 interface from service eNB, as described in the explanation of the control channel after, does not consider thus to give birth to Into new data packet whether be accurately received and can just be issued in UE sides.As it is explained in detail hereinafter, comprising for retransmission process All tasks accessed with HARQ control channel are responsible for by servicing eNB.This simplifies cooperation eNB design.But, certainly The structure of scheme 3 can be used.

Hereinafter, to the further details of action of Fig. 2 of the processing that considers such scheme 2 or scheme 3 dispensing device Illustrate.

In fig. 2, block generating unit 201-1 generates the block of given size from the information bit that should be sent.Block generating unit 201-1 The amount of information bit of the size of the block of generation with that can store a packet is equal.I.e., in the common of dispensing device transmission Include the information bit equivalent to a block in packet.

Re-transmission buffers portion 202-1 will be prepared to retransmit and temporarily kept by the block of the block generating unit 201-1 information bits generated. In addition, re-transmission buffers portion 202-1 can also be discarded in reception device successively is accurately decoded without the necessary block retransmitted.

The control that transmission control unit 206 is received according to uplink control channel reception portion 207 via control channel from UE side joints Signal processed, control new portion acquisition unit 201-2 and re-transmission part acquisition unit 202-2.

Specifically, Fig. 2 dispensing device according to scheme 1（Reference picture 4（a））Action is entered to certain UE as service eNB In the case of work, on certain UE, when not indicating the transmission of retransmitted data packet from the UE sides, following action is performed.I.e., Transmission control unit 206 indicate first new portion acquisition unit 201-2 obtain by block generating unit 201-1 generate with process object UE is corresponding new piece, and is output to new data packet coding unit 201-3 to send.In addition, transmission control unit 206 indicates weight Pass part acquisition unit 202-2 and stop the action.And then, transmission control unit 206 indicates new portion acquisition unit 201-2 by above-mentioned new piece X2 control channels receiving and transmitting part 208 is also outputted to, and is transferred to cooperation eNB corresponding with the UE dealt with objects.

On the other hand, in the case where Fig. 2 dispensing device is acted according to scheme 1 as cooperation eNB to certain UE, close In certain UE, when from the UE, laterally service eNB corresponding with the UE does not indicate the transmission of retransmitted data packet, below execution Action.I.e., transmission control unit 206 indicate that new portion acquisition unit 201-2 is taken into that X2 control channels receiving and transmitting part 208 received by with The corresponding service eNB of UE of process object transfer the new block of coming, and are output to new data packet coding unit 201-3 to send out Send.

Then, Fig. 2 dispensing device according to scheme 2（Reference picture 4（b））Certain UE is acted as cooperation eNB In the case of, reach specified quantity on certain UE NAK received received quantity in uplink control channel reception portion 207 When, perform following processing.I.e., transmission control unit 206 indicates that retransmitting part acquisition unit 202-2 acquisitions is maintained at re-transmission buffers portion The block sent corresponding with above-mentioned NAK in 202（Retransmit block）, and it is output to retransmitted data packet coding unit 202-3 To be retransmitted.In addition, transmission control unit 206 indicates that new portion acquisition unit 201-2 obtains what is generated by block generating unit 201-1 New piece corresponding with the UE of process object, but new data packet coding unit 201-3 is not output to, but it is output to X2 controls Channel transceiver portion 208 is transferred to the corresponding cooperation eNB of UE with dealing with objects.

On the other hand, in the case where Fig. 2 dispensing device is acted according to scheme 2 as cooperation eNB to certain UE, close In certain UE, the uplink control channel reception portion 207 in service eNB corresponding with the UE NAK received reception number When amount reaches specified quantity, following processing is performed.I.e., transmission control unit 206 indicates that new portion acquisition unit 201-2 is taken into X2 controls Channel transceiver portion 208 processed received by service eNB corresponding with the UE of process object transfer Lai new block, and be output to New data packet coding unit 201-3 is sent.

Then, Fig. 2 dispensing device according to scheme 3（Reference picture 4（c））Certain UE is acted as service eNB In the case of, reach specified quantity on certain UE NAK received received quantity in uplink control channel reception portion 207 When, perform following processing.I.e., transmission control unit 206 indicates that retransmitting part acquisition unit 202-2 acquisitions is maintained at re-transmission buffers portion The block sent corresponding with above-mentioned NAK in 202（Retransmit block）, but retransmitted data packet coding unit 202- is not output to 3, but be output to X2 control channels receiving and transmitting part 208 to be transferred to cooperation eNB corresponding with the UE of process object.In addition, sending Control unit 206 indicates that new portion acquisition unit 201-2 is obtained by the corresponding with the UE of process object of block generating unit 201-1 generations New block, and be output to new data packet coding unit 201-3 to be retransmitted.

On the other hand, in the case where Fig. 2 dispensing device is acted according to scheme 3 as cooperation eNB to certain UE, close In certain UE, the uplink control channel reception portion 207 in service eNB corresponding with the UE NAK received reception number When amount reaches specified quantity, following processing is performed.I.e., transmission control unit 206 indicates that retransmitting part acquisition unit 202-2 is taken into X2 Control channel receiving and transmitting part 208 received by service eNB corresponding with the UE of process object transfer Lai re-transmission block, it is and its is defeated Go out to retransmitted data packet coding unit 202-3 to send.

Herein, ACK and NAK are the up-link control letters in the dispensing device acted as service eNB to certain UE Road acceptance division 207 is used as uplink control information described later from the UE of the process object（UCI）And the control signal received, The uplink control information is stored and transferred together with user data.These ACK and NAK represent whether produced in UE The reception mistake of packet, is grouped according to each receive, returns to corresponding service eNB from UE.

In Fig. 2 dispensing device, new block encoding portion 303-1 in new data packet sending part 201 is from new portion When acquisition unit 201-2 have input new block, this new piece is included in information bit portion, by corresponding parity bits bag by generation It is contained in the new packet in parity bits portion.

Retransmitted data packet coding unit 202-3 in retransmitted data packet sending part 202 is from retransmitting part acquisition unit When 202-2 have input re-transmission block, the re-transmission block is included in information bit portion, includes corresponding parity bits by generation Re-transmission in parity bits portion is grouped.

Channel allocation unit 203 will be compiled by the new data packet coding unit 201-3 new packets generated or by retransmitted data packet The re-transmission of code portion 202-3 generations is assigned to communication channel corresponding with the UE dealt with objects, using what is generated as its result Frame data are output to modulation portion 204.

204 pairs of frame data exported from channel allocation unit 203 of modulation portion are modulated, and are output to wireless processing section 205.

Frame data after 205 pairs of modulation of wireless processing section perform defined wireless transmission processing, particularly via not shown Antenna send.

Then, detailed action below to the reception device shown in Fig. 3 in the downlink system in UE Illustrate.

As shown in figure 3, reception device has retransmitted data packet acceptance division 302 and new data packet acceptance division 303.

In figure 3, receiving control unit 304 can be according to included in down link control information（DCI）In new data refer to Show information（With reference to Fig. 9 described later（b））, it is new data packet or retransmitted data packet that identification, which receives packet, wherein, this is descending Link control message is via physical downlink control channel, from service as below described together with receiving packet ENB transmission comes.This is scheme 1 or scheme 2 equivalent to identification, or scheme 1 or scheme 3.In addition, receiving control unit 304 bases perform the retransmitted data packet demodulation section 302-1 of demodulation process output all the time, perform above-mentioned identifying processing.

By the identification, in reception device according to above-mentioned scheme 1（Reference picture 4（a））When being acted, data point are retransmitted Group acceptance division 302, the retransmitted data packet recodification portion 303-1 in new data packet acceptance division 303, retransmitted data packet are resetted Portion 303-2 and elimination portion 303-3 processed are without action, and the reception signal that wireless processing section 301 is received via antenna is straight The elimination portion 303-3 connected in new data packet acceptance division 303, and it is input to new data packet demodulation section 303-4.

New data packet demodulation section 303-4 receives packet from the demodulation of each communication channel, and reception packet is output to newly Packet lsb decoder 303-5, wherein, each communication channel constitutes the reception signal inputted from wireless processing section 301.

New data packet lsb decoder 303-5 is decoded to the new data packet inputted, using what is obtained as its result Fresh information bit is output to the processing unit being not particularly illustrated of rear class.

On the other hand, by receive control unit 304 in above-mentioned identifying processing, Fig. 3 reception device as upper The scheme 2 stated（Reference picture 4（b））Or scheme 3（Reference picture 4（c））During acting, according to the control for receiving control unit 304, make weight Pass both sides' action of data packet receipt portion 302 and new data packet acceptance division 303.

First, the action for retransmitting data packet receipt portion 302 is illustrated.

Retransmitted data packet demodulation section 302-1 receives packet from the demodulation of each communication channel, and reception packet is output to Partially synthetic portion 302-3 is retransmitted, wherein, each communication channel constitutes the reception signal inputted from wireless processing section 301.In addition, should Retransmitted data packet demodulation section 302-1 is in order to receive the above-mentioned identifying processing of control unit 304, no matter receive packet It is retransmitted data packet or new data, is carried out demodulation process.

Retransmit partially synthetic portion 302-3 and the timing of re-transmission packet transaction is being indicated from reception control unit 304, will be from re-transmission The retransmitted data packet of data packet demodulation portion 302-1 inputs is with being originally received failure and being maintained in re-transmission buffers portion 302-2 Past packet synthesis.Then, retransmit partially synthetic portion 302-3 and the composite result is output to retransmitted data packet solution Code portion 302-4.In addition, receiving control unit 304 receives retransmission sequence information and other control information, as with receiving packet one The down link control information transmitted via physical downlink control channel from service eNB（DCI）A part, and will These control information notify to give re-transmission partially synthetic portion 302-3.Partially synthetic portion 302-3 is retransmitted according to these control information, is held The synthesis processing of re-transmission packet of the row based on HARQ modes.

Retransmitted data packet lsb decoder 302-4 is decoded to the retransmitted data packet inputted, and will be used as its result The obtained information bit being reduced is output to output dispenser 302-5.

Dispenser 302-5 is exported in the case of the reduction success of information bit, not scheming especially for rear class is output to The processing unit shown.At the same time, the information bit of reduction is output to new data packet acceptance division 303 by output dispenser 302-5 Interior retransmitted data packet recodification portion 303-1.

Then, the action to new data packet acceptance division 303 is illustrated.

When from output dispenser 302-5 have input the information bit of reduction when, retransmitted data packet recodification portion 303-1 and Retransmitted data packet remodulates portion 303-2 is performed, and generation receives the copy of successful retransmitted data packet.

Elimination portion 303-3 is eliminated as gradually interference（SIC：Successive Interference Cancellation） Processing, for reception signal input from wireless processing section 301, to from servicing eNB（The situation of scheme 2）Or cooperation eNB（Scheme 3 situation）The interference signal composition of the retransmitted data packet of reception carries out cancellation processing.Thus, elimination portion 303-3 is only properly Extract out from cooperation eNB（The situation of scheme 2）Or service eNB（The situation of scheme 3）The reception signal of the new data packet received Composition, and it is output to new data packet demodulation section 303-4.

New data packet demodulation section 303-4 receives packet from the demodulation of each communication channel, and reception packet is output to newly Packet lsb decoder 303-5, wherein, each communication channel, which is constituted, eliminates connecing from the elimination portion 303-3 interference components inputted The collection of letters number.

New data packet lsb decoder 303-5 is decoded to the new data packet inputted, and will be obtained as its result Fresh information bit be output to the processing unit being not particularly illustrated of rear class.

In addition, the reduction treatment of the retransmitted data packet in retransmitted data packet acceptance division 302 fails, not from output Dispenser 302-5 to retransmitted data packet recodification portion 303-1 input when, will from retransmitted data packet remodulates portion 303-2 to Elimination portion 303-3 input is set as zero.Thus, elimination portion 303-3 action is invalid by equivalence.As a result, new data packet Demodulation section 303-4 and new data packet lsb decoder 303-5 handles and carried out the extraction of new data packet without cancelling.

In figure 3, control unit 304 is received for example according to the contrast signal received in signal（RS：Reference Signal）, the physical downlink control channel from service eNB described later is recognized exactly.It is used as service eNB and cooperation RS groups between eNB, by using for example mutually orthogonal signal group that pattern is identical but phase shift is different, make service eNB and association Making the channel identification between eNB becomes easy.

It is used as the variation of the processing mode of reception device described above, it would however also be possible to employ can preferably improve system The interactive mode as described below of performance.

Initially extract retransmitted data packet out, if the packet receives correct, by the SIC processing in elimination portion, extract out New data packet.

If the reception of retransmitted data packet is unsuccessful, new data packet is extracted out, if the new data packet also connects Receive correct, then by the SIC processing in elimination portion, extract above-mentioned retransmitted data packet out again.

So, in the present embodiment, by the way that retransmitted data packet and new data packet are assigned into service eNB and cooperation eNB（The situation of scheme 2）Or distribute to carry out cooperation transmission on the contrary, so as to send pin simultaneously using same channel resource To same UE retransmitted data packet and new data packet.So, in the cooperation sending method of present embodiment, can also have Effect utilizes channel.

For the transmission control unit 206 of the channel resource allocation sent and user's scheduling in service eNB that cooperates（Reference picture 2）Centralized Control.

Herein, as determining whether to implement the important parameter that cooperation is sent, it is somebody's turn to do using link gap △ ue or replacement Gap uses the contrast signal receiving power used as the term in LTE（RSRP：Reference Signal Receiving Power）Difference.The parameter is defined as servicing the logarthmic reception signal power of the UE between the eNB and eNB that cooperates Difference.If the link gap target △ that link gap △ ue are used for another parameter is small, implements cooperation and send.Otherwise, most It is good generally to be sent.By using these parameters, the bandwidth sent for cooperating can be easily controlled.

UE reception device（Fig. 3）Interior reception control unit 304 detects received each RS's successively in the communications RSRP is poor.Then, notify to give service eNB sides via uplink control channel sending part 305, so that in current service eNB Uplink control channel reception portion 207（Fig. 2）Receive these RSRP poor, perform transmission control unit 206（Fig. 2）Whether continue Carry out cooperation transmission and new demand servicing eNB determination etc. reason.

More than, although the cooperation HARQ transmission processing relevant with a UE is illustrated, but as described above, each UE being capable of root Identify whether to perform cooperation transmission according to RS signal groups and recognize service eNB and cooperation eNB.Thus, each eNode-B can Control that itself is acted or acted as cooperation eNB as service eNB according to each UE, can be to respective UE Perform processing same as described above.

Fig. 7 is to show the action sequence legend for representing that service eNB is handled with the determination for the eNB that cooperates.UE is for example being used ENode-B0, eNode-B1 and control signal 0,1 in the state that is communicated, according to these RS signal groups, for example will ENode-B1 is defined as service eNB, eNode-B0 is defined as into the eNB that cooperates（Fig. 7 S1）.Thus, UE for example using connecing at random Enter channel RACH, communicated first with eNode-B1.When notifying data channel and control channel from eNode-B1（Fig. 7's S2）, UE uses the control channel, will be notified with the relevant information of eNode-B0 as cooperation eNB to as service eNB's eNode-B1（Fig. 7 S3）.As a result, notified using X2 interface from eNode-B1 to eNode-B0, and eNode-B0 Data channel and control channel are notified to UE（Fig. 7 S4）.Thus, UE can receive cooperation hair from eNode-B1 and eNode-B0 Send.Now, from as service eNB eNode-B1 receive cooperation send data packet and control information, from be used as cooperation eNB ENode-B0 only receive cooperation send data packet.

Then, illustrated to designing the control channel communicated between eNode-B and UE in control channel.

In the present embodiment, it is configured to：Main control signal is led to via the link between servicing eNB and UE Letter.I.e., it is configured to：Link between service eNB and UE takes on prior effect than the link cooperated between eNB and UE.

In control channel design, three channels are paid close attention to.They are physical uplink control channels（PUCCH： Physical Uplink Control CHannel）, physical downlink control channel（PDCCH：Ph_ysical Downlink Control CHannel）And the control channel based on X2（X2CCH：X2Control CHannel）.

In addition, control channel is according to above-mentioned scheme 2（Reference picture 4（b））Come what is designed.Because, program pin To control channel and the both sides of data channel, more preferable systematic function and lower complexity can be obtained.The selection is aftermentioned System integration project evaluate in confirm.

Fig. 8 is the figure for representing data channel and control channel together with the communication direction.Herein, consider as follows For some restrictions of two channel types.

New data packet is licensed to be sent from service eNB to UE, from cooperation eNB to UE the two links.

Retransmit packet and be licensed the only transmission on from service eNB to UE link.

C1 PUCCH is expressed as from UE to transmission on service eNB link.

C2 PUCCH is expressed as to send on from service eNB to UE link.

Only new data packet and its associated control signal are published to cooperation eNB by X2 interface from service eNB. Control channel in X2 interface is expressed as C3.

Designed according to the control channel as described above sent for cooperation, can significantly cut down control channel amount Meanwhile, it is capable to by the HARQ processing of single direction, significantly shorten system delay.Hereinafter, these three channels are described in more detail Respective design.

First, PUCCH design is illustrated.

In design here, PUCCH and the uplink control information for including two period setting signals as described below （UCI：Uplink Control Information）Correspondence.On the one hand, indicated comprising channel quality（CQI：Channel Quality Indication）, pre-coding matrix instruction（PMI：Precoding Matrix Indication）And order instruction （RI：Rank Indication）, it is recited as CQI/PMI/RI.On the other hand, comprising HARQ-ACK/NAK.PUCCH is only from UE Sent on to service eNB link.In fig. 8, it is expressed as C1.PUCCH passes through the uplink control channel sending part in UE 305（Fig. 3）With the uplink control channel reception portion 207 in the eNode-B acted as service eNB（Fig. 2）It is terminated. Respective active UE for example separates service eNB and cooperation eNB by high-rise control signal.

Each UE is in the same manner as cooperation eNB according to the contrast signal from service eNB（RS）Observe channel response.As above institute State, between the eNB of both sides, RS phase is set in an orthogonal manner.Uplink control channel sending part 305 in UE （Reference picture 3）Uplink control channel reception portion 207 into service eNB corresponding with the UE（Reference picture 2）Notify regular UCI.CQI/PMI/RI included in the UCI is with the link from service eNB to UE and from the eNB that cooperates to this pair of UE link The link-quality correspondence of side.Then, the CUI is only sent to service eNB corresponding with the UE from UE.Because with following two Individual reason.

Generally, the link-quality from service eNB to UE is not worse than the quality from cooperation eNB to UE.This causes Performance for UL control channels becomes reliable.

This can significantly cut down control channel amount, being capable of simplify control channel design.

Fig. 9（a）It is the data format figure for the example for representing the UCI for both sides' link.The form, which is included, is directed to both sides' chain The respective CQI on road.In addition, also including corresponding PMI and RI.Field information corresponding with PMI and RI is for both sides' link Identical.

Then, it is used for ACK or NAK that HARQ is handled included in UCI（HARQ-ACK/NAK）Be represent be in UE The information of the no reception mistake for generating packet.Retransmitted data packet lsb decoder 302-4 in reception device shown in Fig. 3 and new Packet lsb decoder 303-5 is in respective decoding process, in the repetition time that error rate is more than defined threshold value and decoding When number reaches stipulated number, it would be desirable to which the meaning for retransmitting each packet handled notifies to send to uplink control channel Portion 305.Thus, the reception that uplink control channel sending part 305 indicates re-transmission according to each is grouped, to comprising up The corresponding service eNB of UE of link control channel sending part 305 send NAK.As the situation beyond above-mentioned condition, number is being retransmitted When each having successfully received reception packet according to packet decoding portion 302-4 and new data packet lsb decoder 303-5, up-link control Channel sending part 305 processed is successfully received according to each reception and is grouped, to including uplink control channel sending part 305 The corresponding service eNB of UE send ACK.

HARQ-ACK/NAK included in above-mentioned UCI is by servicing the uplink control channel reception portion 207 in eNB （Reference picture 2）To receive, the information is delivered to transmission control unit 206.Transmission control unit 206 performs HARQ weight as described above Biography processing.Now, as retransmission process, as being described previously as scheme 2, preferably only UE is implemented from service eNB.Its Reason is as follows.

The transmission delay of the re-transmission packet based on HARQ processing can be cut down.

The control channel comprising PDCCH and X2CCH can be simplified.

The complexity for cooperation eNB can be mitigated.Because, transmitted new packet does not end up at cooperation eNB The re-transmission buffers portion 302-2 configured（Fig. 2）In.As long as cooperation eNB follows the control channel from X2 interface（X2CCH）It is only real The transmission of Shi Xin packets.

, double in order to service eNB and cooperation eNB the field of HARQ-ACK/NAK on PUCCH is designed as follows, i.e., The corresponding transmission packet in side, and include the corresponding ACK/NAK signals of both sides（2 bits）.

Then, the design to PDCCH is illustrated.

In design here, PDCCH in the way of being expressed as C2 only from service eNB to the service destination in fig. 8 UE send.Now, PDCCH by as service eNB come the transmission control unit 206 in the eNode-B that acts（Fig. 2）In UE Reception control unit 304（Fig. 3）And be terminated.

I.e., each UE is only decoded to the PDCCH from service eNB corresponding with the UE.Its reason has following two.

Link-quality from service eNB to UE is not worse than the quality from cooperation eNB to UE.This to be directed to control channel Performance become reliable.

PDCCH only is sent from a link, the load of control channel can be significantly relaxed.

Herein, the down link control information transmitted using PDCCH（DCI：Downlink Control Information）Current whether sent using cooperation can be indicated.Due to the purpose, new bit is imported in DCI. As others statement, PCI comprising identification transmission packet be new data packet or retransmitted data packet, be scheme 1 or Scheme 2 or be scheme 1 or scheme 3 bit.This is made to indicate whether to perform reception device HARQ processing .The information can by using in LTE standard it has been specified that and exist new data configured information（With reference to figure described later 9（b））To realize.

In addition, including information as shown below in DCI.

Except being used in form 1, form 1A and form 1C services eNB modulation coding mode（MCS： Modulation and Coding Scheme）In addition, in addition it is also necessary to 5 bits for the MCS of the addition for the eNB that cooperates.

The MCS of addition in form 2（5 bits）And precoding information.

The CRC that the DCI of both sides' link comprising information above has used UE specific, which is concentrated, to be encoded.Fig. 9（b）It is middle to represent The DCI of form 2 example is used.In the figure, " RB dispensing heads " and " RB distribution " is the control that distribution with resource block is relevant Information processed." new data configured information " is to indicate that transmission packet is the information of new data packet or retransmitted data packet." redundancy Version " is HARQ control information." MCS-1 " and " MSC-2 " is the MCS for being respectively used to service eNB and the eNB that cooperates.Precoding Information 1 and precoding information 2 are the precoding informations for being respectively used to service eNB and the eNB that cooperates.

PDCCH comprising DCI is collectively stored in for example with the data format of E-UTRA communication systems with user data packets In defined subframe and transmit.

Then, the design to the control channel based on X2 is illustrated.

Control channel based on X2（X2CCH）Via the X2 interface for the C3 for being expressed as Fig. 8, and corresponding to the control channel Packet is issued together.Specifically, X2CCH is by servicing the dispensing device shown in eNB and cooperation eNB both sides Fig. 2 Interior X2 control channels receiving and transmitting part 208 and be terminated.The X2CCH is realized for example on the wire link for used optical fiber.

X2CCH includes information as described below.

Resource allocation head：1 bit

Resource block is distributed

Modulation coding mode：5 bits

Precoding information

Transmission timing in subframe

Then, the timing controlled between above-mentioned X2CCH and PDCCH is illustrated.

It is for one of most important argument for the transmission that cooperates to send timing controlled.This is determined by servicing eNB, and is led to Cross what X2 interface was indicated cooperation eNB.Send the timing considerations delay of X2 interface.

Figure 10 is the figure for the example for illustrating the transmission timing between control channel and data channel.In the figure, data （Data）Sent with corresponding X2CCH in the association from service eNB to UE of timing t 2（" PDCCH " and " come from S- ENB data "）Before, it is transferred to cooperation eNB.Data from eNB（" data from C-eNB "）Transmission timing t 1 by Service eNB is determined according to the maximum delay T of X2 interface.By the synchronizing network between such service eNB and the eNB that cooperates, Data from service eNB and the data from cooperation eNB are issued in predetermined timing t 1 and t2.This ensures the number of both sides Received according to timing t 3 at the same time.

Including above-mentioned timing controlled, the cooperation for each UE is sent by servicing eNB centralized Controls.These control bags Scheduling and transmission timing controlled containing UE and data.

For the performance of the cooperation HARQ sending methods of evaluating present embodiment described above, implement system-level imitative Very.

In the system integration project, the dispensing device of present embodiment is equipped with（Fig. 2）And reception device（Fig. 3）System It is installed in by 7 clusters（cluster）In the subzone network of formation.Each cluster is made up of 19 six side cells, and each cell includes 3 sectors （sector）.The aiming point of the antenna of the sector（bore-sight point）Towards the end of hexagon.In order to critically external The interference that side cell is produced is modeled, and is employed in center configuration object of observation cluster, 6 copies of balanced configuration on its side Encirclement type net structure.The emulation of point situation and condition hypothesis are shown in Tables 1 and 2 respectively.

5UTRA and EUTRA emulation most group

Emulation	CF	ISD	BW	PLoss	Speed	Channel
							Case	（GHz）	（Rice）	（MHz）	（dB）	（km/h）	Model
1	2.0	500	10	20	3	TU
							2	2.0	500	10	10	30	TU
3	2.0	1732	10	20	3	TU

Table 1

System integration project condition hypothesis

Table 2

First, by the BLER for the HARQ system for evaluating present embodiment（Block Error Rate）, implement to enter The complete set irrespective of size emulation that row cooperation is sent.

Figure 11's（a）、（b）、（c）Be show each UE BLER as respectively with case 1, case 2 and case 3 Initial transmission, retransmit the figure of the relevant geometric function of #1, #2, #3.

The UE that table 3 is the initial transmission being directed in case 1, case 2 and case 3, retransmit #1, #2, #3 overall is averaged BLER's collects.For case 1, case 3 for the BLER that initially sends to be 78% for case 2 near 9%.But, After retransmitting for the first time, the BLER for case 1, case 3 is less than 0.1%, and 25% is changed into for case 2.Thus, importing During the reception device for performing appropriate SIC processing of present embodiment, it is known that can expect to improve is used for the system of cooperation transmission Performance.

【Table 3】

The average BLER for initially sending, retransmitting #1, #2, #3 in case 1, case 2 and case 3

Send index	Case 1	Case 2	Case 3
				It is initial to send	9.11E-02	7.83E-01	8.89E-02
Retransmit #1	1.21E-03	2.56E-01	1.20E-03
				Retransmit #2	6.54E-05	4.79E-02	6.27E-05
Retransmit #3	7.69E-06	7.59E-03	0

Then, the SINR gains to the reception device of the implementation SIC processing from present embodiment are illustrated.

As described above, link gap target △ is that the important parameter for producing influence is sent on cooperation.In system integration project In, use the parameter to control the bandwidth between cooperation eNB.The motivation for implementing the system integration project is in order to scheme 3 The gain clearly realized in scheme 2.First, various setting value 1dB, 10dB, 19dB for link gap target △ are drawn Cooperation send user in reception SINR（Signal-to-Interference and Noise power Ratio：Signal To interference/noise power ratio）CDF（Cumulative Density Function：Cumulative density function）.Thereby, it is possible to scheme Show the SINR at 0.5 CDF points.This illustrates the gain of the SIRN from scheme 2 exactly.

Herein, the example in drafting figure is defined in the manner as described below.

Serving link, No-SIC：Not to from cooperation eNB（Or synergistic link）Interference carry out SIC cancellations It is during processing, from service eNB（Or service link）The SNR received by UE（Signal-to-Noise Ratio）Or SNR increases Benefit.This is corresponding with scheme 3.

Collab link, No-SIC：Not to from service eNB（Or service link）Interference carry out SIC cancellations at It is during reason, from cooperation eNB（Or synergistic link）By the UE SNR received or SNR gain.This is corresponding with scheme 2.

Serving link, SIC：To from cooperation eNB（Or synergistic link）Interference carry out SIC cancel processing when , from service eNB（Or service link）By the UE SNR received or SNR gain.This is corresponding with scheme 3.

Collab link, SIC：To from service eNB（Or service link）Interference carry out SIC cancel processing when, From cooperation eNB（Or synergistic link）By the UE SNR received or SNR gain.This is corresponding with scheme 2.

Figure 12's（a）、（b）、（c）Illustrate from service eNB and cooperation eNB respective situation, SIC with/without Respective situation, each △ setting value 1dB, 10dB and 19dB it is respective in the case of, by the UE SINR received CDF.With The link-quality between the target increase of link gap, service eNB and UE can gradually improve.In addition, elimination portion 303-3 （Fig. 3）SIC processing to cooperation eNB and UE between link preferably acted.

Figure 13 is to illustrate to drop into the target △ of link gap, is determined as the figure of the UE of cell end subscriber probability.Pin To such UE, implement cooperation and send.When in link gap, target △ is for example with the appropriate value near 8dB, cell end subscriber Percentage be near 60%.This is sufficiently large value, is the value that request cooperation is sent.

Figure 14 is to illustrate further letter function, as △ as link gap target △ when CDF values are 50% Several UE SINR figure.Figure 15 also further calculates the SINR for being directed to the UE for having SIC and two links without SIC than Figure 14 Gain.

By comparing the link from cooperation eNB to UE（Link 1）With the link from service eNB to UE（Link 2）, it is such as following The mode obtains several observed results.

Retransmitted data packet from service eNB issue when, based on SIC processing the SINR gains for link 1 be 2~ 2.5dB near.

When retransmitted data packet is from cooperation eNB issues, the SINR gains for link 2 based on SIC processing are 1.5 Near~1.75dB.

When △ values increase, the SINR gains of link 1 become much larger, and the SINR gains of link 2 become smaller.So, △ values should be set to not too small only big.In addition, the possibility that small △ can send generation cooperation becomes too low, and it is big △ can make generation cooperation send possibility become it is too much.Appropriate △ values are between 8dB and 10dB.From based on SIC's From the point of view of the investigation of SINR gains, as conclusion, retransmitted data packet should be all the time from service eNB issues.

More than, in this application, it is proposed that for realizing high SINR gains using the reception device of SIC processing is performed , for HARQ processing cooperation sending method.

The application utilizes the exclusive features of HARQ as low BLER all the time in HARQ with reference to after, becomes SIC processing That has no precedent is easy.

In order to realize based on SIC processing high SINR gains, as a result, retransmitted data packet all the time from service eNB to Issued on UE link, therebetween, preferably new data packet is issued on from cooperation eNB to UE link.But, certainly It can design on the contrary.

On control channel, it is considered to enforceability and simplicity and paid close attention to physical uplink control channel（PUCCH）、 Physical downlink control channel（PDCCH）And the control channel based on X2（X2CCH）These three channels.The control channel is set Meter can significantly shorten system delay while can significantly cut down control channel amount.

Cooperation sending method described above can also be applied between two sending points in same eNode-N Occurs the inside eNode-B that cooperation is sent.

Claims (4)

1. a kind of wireless communication system, in the wireless communication system, including the 1st radio base station apparatus and the 2nd wireless base station dress Multiple radio base station apparatus including putting perform cooperation to wireless terminal device and sent, wherein：

1st radio base station apparatus includes transmitting element, and the transmitting element is sent comprising relevant to the wireless terminal device The control channel of the information of resource allocation, wherein, for the resource allocation sent that cooperates by the 1st radio base station apparatus Control, the control channel is only sent from the 1st radio base station apparatus；

The wireless terminal device includes receiving unit, and the receiving unit receives the institute sent from the 1st radio base station apparatus State control channel, and the receiving unit can not the data that are sent from the 1st radio base station apparatus of light-receiving, also receive from The data that 2nd radio base station apparatus is collaboratively sent.

2. a kind of wireless terminal device, the wireless terminal device can be received from including the 1st radio base station apparatus and the 2nd wireless base The data that multiple radio base station apparatus cooperation including station arrangement is sent, wherein, the wireless terminal device includes：

Receiving unit, it receives the control for including the information about resource allocation only sent from the 1st radio base station apparatus Channel, and the receiving unit can not the data that are sent from the 1st radio base station apparatus of light-receiving, also receive from described The data that 2 radio base station apparatus are collaboratively sent,

Wherein, controlled for the resource allocation sent that cooperates by the 1st radio base station apparatus.

3. a kind of radio base station apparatus, it can collaboratively send data, the radio base station apparatus with the 2nd radio base station apparatus Including：

Transmitting element, it sends the control channel and data for including the information about resource allocation to wireless terminal device, described Wireless terminal device receives the control channel sent from the radio base station apparatus, and the wireless terminal device can The data that light-receiving is not sent from the radio base station apparatus, also receive what is collaboratively sent from the 2nd radio base station apparatus Data,

Wherein, the control channel only by from the radio base station apparatus send, for cooperate send the resource allocation by The radio base station apparatus control.

4. a kind of method for wireless communication system, in the wireless communication system, including the 1st radio base station apparatus and the 2nd Multiple radio base station apparatus including radio base station apparatus perform cooperation to wireless terminal device and sent, wherein, methods described bag Include following steps：

The control for including the information about resource allocation is only sent from the 1st radio base station apparatus to the wireless terminal device Channel, wherein, for cooperating, the resource allocation sent is controlled by the 1st radio base station apparatus；

The control channel sent from the 1st radio base station apparatus is received by the wireless terminal device；And

Enable the wireless terminal device data that light-receiving is not sent from the 1st radio base station apparatus, also receive from The data that 2nd radio base station apparatus is collaboratively sent.