CN105337644A

CN105337644A - Timing synchronization for downlink (DL) transmissions in coordinated multipoint (CoMP) systems

Info

Publication number: CN105337644A
Application number: CN201510751241.4A
Authority: CN
Inventors: A.达伊多夫; G.莫罗佐夫; A.马特塞; V.塞格耶; I.博洛廷
Original assignee: Intel Corp
Current assignee: Apple Inc
Priority date: 2011-11-04
Filing date: 2012-06-05
Publication date: 2016-02-17
Anticipated expiration: 2032-06-05
Also published as: CA2932387A1; JP2016105603A; MY175550A; JP2018196127A; JP2018110402A; JP2016178640A; JP6326122B2; CA2932387C; HK1224094A1; MY168109A; CN107257252B; CN105871429A; HUE035205T2; JP6726815B2; HK1216465A1; RU2669781C1; RU2643660C1; CN107257252A; JP2017085581A; RU2015138682A

Abstract

Technology for adjusting a receiver timing of a wireless device in a Coordinated Multipoint (CoMP) system is disclosed. One method can include the wireless device receiving a plurality of node specific reference signals (RSs) from a plurality of cooperating nodes in a coordination set of the CoMP system. The coordination set includes at least two cooperating nodes. The wireless device can estimate a composite received RS timing from a plurality of received RS timings generated from the plurality of node specific RSs. The received RS timings represent timings from the at least two cooperating nodes. The wireless device can adjust the receiver timing based on the composite received RS timing. A node specific RS can include a channel-state information reference signal (CSI-RS).

Description

For coordinating the Timing Synchronization that in multiple spot (CoMP) system, down link (DL) transmits

Related application

This application claims the rights and interests that the attorney docket submitted on November 4th, 2011 is P41399Z, sequence number is the U.S. Provisional Patent Application of 61/556109, and be incorporated into this by reference.

Background technology

Wireless mobile telecommunication technology adopts various standard and agreement to transmit data between node (such as, transfer station) and wireless device.Some wireless devices use the OFDM (OFDM) in conjunction with needed number modulation scheme to communicate via physical layer.The standard of OFDM and agreement is used to comprise third generation partner program (3GPP) Long Term Evolution (LTE), Institute of Electrical and Electric Engineers (IEEE) 802.16 standard (such as, 802.16e, 802.16m) (WiMAX (worldwide interoperability for microwave access) is commonly referred to industrial colony), and IEEE802.11 standard (WiFi is commonly referred to industrial colony).

In 3GPP radio access network (RAN) LTE system, node can be that universal terrestrial radio Access Network (E-UTRAN) NodeB of evolution is (usually also referred to as evolved NodeB, enhancement mode NodeB, eNodeB, or eNB) and the combination of radio network controller (RNC), described node communicates with the wireless device (such as, mobile device) being called subscriber equipment (UE).Down link (DL) transmission can be the communication from node station (or eNodeB) to wireless device (or UE), and up link (UL) transmission can be the communication from wireless device to node.

In homogeneous network, the node also referred to as grand node can provide basic wireless coverage to the wireless device in community.Community can be that wireless device can operate to carry out with grand node the region that communicates wherein.Due to the use of the increase of wireless device and functional, heterogeneous network (HetNet) is used to the traffic load of the increase processed on grand node.HetNet can comprise the layer of the grand node of high power (or grand eNB) of planning, this layer is by lower-wattage node (micro-eNB, slight eNB, femto eNB, or family eNB [HeNB]) layer cover, described lower-wattage node may to plan poorly or even complete inharmonic mode is deployed in the area of coverage (community) of grand node.Lower-wattage node (LPN) can be commonly referred to as " low power nodes ".Grand node can be used for basic covering, and low power nodes can be used to fill covering leak, to improve the capacity at hot zone or the border between the area of coverage of grand node, and hinders Signal transmissions part to improve in-door covering in building structure.Inter-Cell Interference Coordination (ICIC) or enhancement mode ICIC (eICIC) can be used for resource coordination, to reduce the interference between node (the grand node in such as HetNet and low power nodes).

Accompanying drawing explanation

Feature and advantage of the present disclosure are obviously found out in the detailed description of carrying out below in conjunction with accompanying drawing, and accompanying drawing illustrates feature of the present disclosure jointly, wherein:

The OFDM symbol that Fig. 1 illustrates OFDM (OFDM) symbol transmission coming grand node in self-coordinating group and low power nodes (LPN) according to an example, receive at wireless device and the schematic diagram using reception reference signal (RS) timing adjustment fast fourier transform (FFT) window the earliest;

The OFDM symbol that Fig. 2 illustrates OFDM (OFDM) symbol transmission coming grand node in self-coordinating group and low power nodes (LPN) according to an example, receive at wireless device and use reference signal to receive the schematic diagram of dynamic rate (RSRP) and reception reference signal (RS) timing adjustment fast fourier transform (FFT) window;

The OFDM symbol that Fig. 3 illustrates OFDM (OFDM) symbol transmission carrying out the multiple cooperative nodes in self-coordinating group according to an example, receive at wireless device and the schematic diagram using Reference Signal Received Power (RSRP) and reception reference signal (RS) timing adjustment fast fourier transform (FFT) window;

The schematic diagram of the OFDM symbol that Fig. 4 illustrates OFDM (OFDM) symbol transmission carrying out the multiple cooperative nodes in self-coordinating group according to an example, receive at wireless device and invert fast fourier transformation (IFFT) window of Use Adjustment timing adjustment first cooperative nodes;

Fig. 5 illustrates the block diagram of the radio frame resource according to an example;

Fig. 6 illustrates the flow chart of the Timing Synchronization transmitted for the down link (DL) coordinated in multiple spot (CoMP) system according to an example;

Fig. 7 illustrates the block diagram of the physical layer of the transmitter and receiver in OFDM (OFDM) wireless network according to an example;

Fig. 8 illustrates the flow chart of the method for the receiver timing for adjusting wireless device in coordination multiple spot (CoMP) system according to an example;

Fig. 9 illustrates the flow chart of the method synchronous relative to the downlink transmission of the second cooperative nodes for the timing making the down link of the first cooperative nodes (DL) transmit in coordination multiple spot (CoMP) system according to an example;

Figure 10 illustrates the block diagram of wireless device according to an example and multiple cooperative nodes; And

Figure 11 illustrates the schematic diagram of the wireless device according to an example.

Now with reference to shown exemplary embodiment, and these embodiments are described use language-specific herein.But, should be appreciated that and do not really want to limit scope of the present invention thus.

Embodiment

Before the present invention is disclosed and described, should be appreciated that the present invention is not limited to ad hoc structure disclosed herein, process steps or material, but expand to the equivalent that those of ordinary skill in the related art can identify.It is also understood that adopted term herein only for describing the object of particular example, instead of will limit.In different drawings, identical Reference numeral represents identical element.The numeral provided in flow chart and process provides in order to clearly description of step and operation, might not indicate specific order or sequence.

Example embodiment

The preliminary general introduction of technical em-bodiments is provided below, then, concrete technical em-bodiments is described in further detail after a while.This is tentatively summarized and is intended to help reader more promptly to understand this technology, but does not really want key feature or the essential feature of identification technology, neither limit the scope of theme required for protection.

Coordinate multiple spot (CoMP) system to can be used to reduce the interference from adjacent node in homogeneous network and HetNet.In coordination multiple spot (CoMP) system, the node being called cooperative nodes also can together with other node be grouped in, wherein from multiple community node can transmission signal to wireless device with from wireless device Received signal strength.Cooperative nodes can be the node in homogeneous network or the grand node in HetNet and/or lower-wattage node (LPN).Down link CoMP transmission can be divided into two classes: coordinated scheduling or coordinates beam are shaped (CS/CB or CS/CBF), and Combined Treatment or joint transmission (JP/JT).Adopt CS/CB, given subframe can be sent to given wireless device (UE) from a community, and dispatches, and comprises coordinates beam and is shaped, dynamic coordinate between cells, to control and/or to reduce the interference between different transmission.For Combined Treatment, perform joint transmission to wireless device (UE) by multiple community, wherein, multiple node uses identical time and frequency radio resource and/or dynamic cell to select to transmit simultaneously.

In non-CoMP system, carry out the Timing Synchronization at wireless device (such as, UE) by use master sync signal (PSS) and/or cell specific reference signal (CRS).As shown in Figure 1, in down link (DL) CoMP system and have in the deployment of the spaced antenna of diverse geographic location, using PSS and/or CRS to carry out timing estimation may be inaccurate, because PSS and/or CRS transfer point (such as, grand node 210 in macrocell 212) may be not identical with physical down link sharing channel (PDSCH) transfer point (the lower-wattage node [LPN] 220 such as, in LPN community 222).Select in (DPS) DLCoMP example using the dynamic point of the common cell identifier (ID) shown in Fig. 1, can be transmitted the substantially identical time for 260 (comprising data or PDSCH) from grand node to the DL of wireless device (such as, UE230) transmission 250 (comprising PSS and/or CRS) with the DL the separated transmission from LPN to wireless device.Due to diverse geographic location and/or the other factors of node (such as, grand node and LPN), DL transmission can arrive wireless device in the different time.Wireless device can be synchronized to PSS and/or CRS transfer point (such as, grand node).Such as, due to propagation delay, OFDM (OFDM) symbol in grand node-node transmission 252 can be received in the different time by wireless device (such as, UE) with the OFDM symbol identical in fact in LPN transmission 262.OFDM symbol can comprise Cyclic Prefix (CP).Because UE is closer to LPN instead of grand node, the UE of therefore grand node DL transmission 254 receives can have the propagation delay 256 larger than the propagation delay 266 of the UE reception of LPNDL transmission 264.If be used for Timing Synchronization from PSS and/or CRS of grand node, the timing for fast fourier transform (FFT) window 280 of sampling to OFDMA symbol can be synchronized to grand node DL and transmit, and this transmission may not be transmission the earliest in coordination group.Therefore, wireless device may apply the transmission of (in this coordination group) other node from the timing with the OFDM symbol shifted to an earlier date relative to FFT sampling window.In addition, in some cases, the transmission from grand node may not have peak signal power (such as, Reference Signal Received Power (RSRP)) and/or provide transfer of data (such as, PDSCH).In these cases, inter-carrier interference (ICI) and intersymbol interference (ISI) 270 may occur due to the incorrect setting of the FFT timing at wireless device.Receive to reduce ICI and ISI and improving OFDMA symbol, the timing of adjustable receiver, this can offset FFT window.Multiple FFT samples of OFDM symbol can be caught in the FFT window for receiving OFDM symbol.Although grand node and LPN shown in Fig. 1-2, the node of any type in DLCoMP system can be used in.

The Timing Synchronization of the receiver timing of wireless device can be modified to use the timing estimation produced from the node specific reference signals of CoMP measurement group, and wherein basic Timing Synchronization uses PSS and/or CRS.Node specific reference signals can comprise channel state information reference signals (CSI-RS).Receiver timing can be the timing of receiver inter-process, such as, find the timing on OFDM symbol border when receiver or work as the moment that receiver carries out FFT (such as, to OFDM symbol sampling).Because different CSI-RS configurations can be assigned to the different transfer points (such as, grand node and LPN) of geographically separating, timing estimation can be carried out independently for each transfer point.Based on the multiple timing estimation from CSI-RS, wireless device can calculate the actual timing received from the data of multiple node or PDSCH.

In one example, wireless device can from the coordination group of CoMP system (such as, CoMP measurement group) in multiple cooperative nodes (such as, grand node and LPN) receive multiple node specific reference signals (RS), such as CSI-RS.Coordination group can comprise at least two cooperative nodes.Cooperative nodes can comprise service node, grand node or LPN.Wireless device can from least two specific RS of cooperative nodes receiving node.Wireless device can generate from the specific RS of the node of cooperative nodes or calculate and receive RS timing.Wireless device can receive RS timing from multiple reception RS timing estimation synthesis.Reception RS timing can represent the timing from least two cooperative nodes.Wireless device can receive the timing of RS timing adjustment receiver based on synthesis.The receiver timing adjusted can be that the receiver of wireless device is received signal or OFDM symbol sampling, carries out or process time of FFT.

In one embodiment, wireless device can from representing that reception RS timing is the earliest determined in multiple reception RS timing of various cooperative nodes.For adjust receiver timing and/or FFT window estimated by synthesis receive RS timing can use or comprise the earliest reception RS timing 282.Reception RS timing the earliest can represent the DL transmission relative to other cooperative nodes with the shortest propagation delay.Estimated synthesis receives the PDSCH timing τ of RS timing or reality _pDSCHall timings calculated in CoMP measurement group can be set to in the earliest timing, by represent, wherein, τ _pDSCHbe physical down link sharing channel (PDSCH) regularly, be the channel state information reference signals (CSI-RS) that goes out for each node calculate in CoMP measurement group regularly, min () is minimum value function, and i is the positive integer (that is, having i node in CoMP measurement group) of the node represented in CoMP measurement group.At wireless device, the timing of the signal shifted to an earlier date relative to the FFT sampling interval of wireless device can be reduced based on reception RS timing adjustment receiver timing the earliest or FFT window.In one example, using the estimated synthesis of the timing of reception RS the earliest to receive RS timing can be used in the joint transmission (JP/JT) of Combined Treatment (JP), so, the CSI-RS timing that may correspond in nearest node adjusts the FFT sampling interval.In joint transmission (JT), PDSCH can be transmitted from multiple cooperative nodes of cooperation district.

In another embodiment, wireless device can from representing that minimum reception RS timing and maximum reception RS timing are determined in multiple reception RS timing of various cooperative nodes.It can be value in fact between minimum reception RS timing and maximum reception RS timing or receiver RS timing that the synthesis estimated receives RS timing.As shown in Figure 3, minimum reception RS timing 362 can comprise the timing of reception RS the earliest representing the DL transmission relative to other cooperative nodes with the shortest propagation delay.Maximum reception RS timing 364 can comprise the timing of reception RS at the latest representing the DL transmission relative to other cooperative nodes with the longest propagation delay.

In another embodiment, to be determined by the Reference Signal Received Power (RSRP) for cooperative nodes and the combination of reception RS timing that generates from the specific RS of the node of cooperative nodes or the synthesis calculated for adjusting receiver timing and/or FFT window receives RS regularly.Such as, the weighted sum of CSI-RS timing can be used to receive RS timing 284 or actual timing to the synthesis calculating estimation, by represent, wherein, τ _pDSCHbe physical down link sharing channel (PDSCH) regularly, each in the channel state information reference signals (CSI-RS) the calculated timing of CoMP measurement group, be CSI-RS antenna port received signal power, i is the positive integer of the node represented in CoMP measurement group, and f () is the monotonic function of its independent variable (that is, function argument).Adjusting receiver timing or FFT window based on RSRP can to from having the maximum or channel of peak signal power or the OFDM symbol of Signal reception provides weight or priority.Using Reference Signal Received Power (RSRP) and receive RS timing for the synthesis of the combination of the reception RS timing of cooperative nodes can select (DPS) or dynamic cell to select to use in (DCS) at the dynamic point of Combined Treatment (JP).Select in dynamic cell in (DCS), transmit PDSCH from the single cooperative nodes coordination group, this can be dynamically selected.

In another embodiment, transmission cooperative nodes in the core network or controller can select selected cooperative nodes from multiple cooperative nodes, with in the receiver timing regulating wireless device for reference to cooperative nodes.Sending cooperative nodes can be the cooperative nodes identical from selected cooperative nodes or different cooperative nodes.Send cooperative nodes can transmit the selection of selected cooperative nodes to wireless device.Wireless device can receive the selection of described selected cooperative nodes from this cooperative nodes.Selected cooperative nodes selection can for this wireless device down link control information (DCI) in transmit or inform with signal.Wireless device can receive the specific RS of multiple node from various cooperative nodes.Wireless device can from generating synchronous RS timing from the selected specific RS of node determining cooperative nodes.Synchronous RS timing can be used to as received data or the physical down link sharing channel (PDSCH) that receives adjust receiver timing (for Timing Synchronization) of wireless device.Described synthesis receives RS timing can comprise synchronous RS timing.By this way, cooperative nodes (such as, sending cooperative nodes) in the core network or controller can be selected to be used to synthesize the RS timing receiving RS timing, and synthesis receives RS timing for adjusting receiver timing to receive PDSCH.

Fig. 3 illustrates that the receiver timing of the wireless device in multiple spot (CoMP) system is being coordinated in adjustment, coordinate multiple spot (CoMP) system and there are two cooperative nodes 310A-B (such as, first and second cooperative nodes), their transmission node specific reference signals (NS-RS) 350A-B are to the wireless device 330 in coordination group 320.Wireless device can by initial synchronisation to PSS and/or CRS transfer point (such as, the second cooperative nodes).Such as, due to propagation delay, the OFDM symbol in the first cooperative nodes transmission 352B can be received in the different time by wireless device with the OFDM symbol identical in fact in the second cooperative transmission 352A.Because wireless device is closer to the first cooperative nodes instead of the second cooperative nodes, the wireless device (WD) that therefore the second cooperative nodes (CN) DL transmits 354A receives to have and transmits the larger propagation delay 356A of propagation delay 356B that the wireless device (WD) of 354B receives than the first cooperative nodes (CN) DL.If be used for Timing Synchronization from PSS and/or CRS of grand node, the timing for fast fourier transform (FFT) window 380 of sampling to OFDM symbol can be synchronized to grand node DL and transmit.Synthesis reception RS timing 384 for adjusting the estimation of receiver timing and/or FFT window can use or comprise reception RS timing the earliest, or by determining for the Reference Signal Received Power (RSRP) of cooperative nodes and the combination of reception RS timing or calculate.Wireless device generate from multiple cooperative nodes reception RS timing before, cooperative nodes can the specific RS of transmission node to wireless device.

Fig. 4 illustrates in coordination multiple spot (CoMP) system, in order to reduce ICI and ISI, and another example that the timing that the DL of the first cooperative nodes is transmitted is synchronous relative to the downlink transmission of the second cooperative nodes.Time that can be substantially identical receives OFDM symbol from two cooperative nodes.Adjustment timing 396 can make in the transmitter timing device of cooperative nodes, and it can offset invert fast fourier transformation (IFFT) and modulate window.IFFT modulator or IFFT module can be used for generating modulation signal.Wireless device can receive RS timing by comprising synthesis or be sent to the first cooperative nodes from the timing feedback of the first cooperative nodes reception RS timing of the specific RS generation of node from the first cooperative nodes.First cooperative nodes can receive timing feedback from wireless device.Synthesis can be used to receive RS timing for first cooperative nodes or the first cooperative nodes reception RS timing revises downlink transmission timing (such as, the first cooperative nodes DL transmission 392) by adjustment timing 396.The timing of amendment downlink transmission can comprise according to synthesis receive RS timing or the first cooperative nodes receive RS timing offset (such as, postpone or in advance) for the down link signal of downlink transmission invert fast fourier transformation (IFFT) regularly.Can reduce the time between minimum reception RS timing and maximum reception RS timing in the first cooperative nodes (CN) the DL change transmitted in wireless device (WD) reception of 394, this can make received OFDM symbol align and reduce ICI and ISI.In another example, the downlink transmission from least two cooperative nodes in multiple cooperative nodes can be received by the time that wireless device is substantially identical.In another example, the DL transmission of cooperative nodes is adjustable to make the reception transmitted at the DL of wireless device be synchronized with the timing of specifying, such as existing PSS and/or CRS.

In another example, the receiver timing of wireless device can use the information come from from the specific RS of node of multiple cooperative nodes to adjust, and the transmitter timing of at least one cooperative nodes can use timing feedback to adjust, to reduce the time between minimum reception RS timing and maximum reception RS timing.

In one example, as shown in Figure 5, OFDM symbol and the specific RS of node can represent the element of the radio frame structure using general Long Term Evolution (LTE) frame structure to transmit on physics (PHY) layer in downlink transmission or ul transmissions between node (or eNodeB) and wireless device (or UE).Although illustrate LTE frame structure, the frame structure of the communication standard of the IEEE802.16 standard (WiMax) for using OFDM, IEEE802.11 standard (WiFi) or another type also can be used.

Fig. 5 illustrates downlink radio frame structure type 2.In this example, the radio frame 100 for transmitting the signal of data can be configured to the duration T with 10 milliseconds (ms) _f.Each radio frame sectional or be divided into 10 subframe 110i, each long 1ms.Each subframe can be subdivided into two time slot 120a and 120b, the duration T of each time slot further _slotfor 0.5ms.Each time slot of the component carrier (CC) that cell site and receiving station use can comprise multiple Resource Block (RB) 130a, 130b, 130i, 130m and 130n based on CC frequency bandwidth.CC can have the carrier frequency with bandwidth sum centre frequency.Each RB (physics RB or PRB) 130i can comprise 12-15kHz subcarrier 136 (on the frequency axis) and each subcarrier has 6 or 7 OFDMs (OFDM) symbol 132 (on a timeline).If adopt short or normal Cyclic Prefix, RB can use 7 OFDM symbol.If use the Cyclic Prefix of expansion, RB can use 6 OFDM symbol.When using short or normal Cyclic Prefix, Resource Block can be mapped to 84 resource element (RE) 140i, or uses the Cyclic Prefix of expansion, and Resource Block can be mapped to 72 RE (not shown).RE can be the unit that an OFDM symbol 142 is multiplied by a subcarrier (that is, 15kHz) 146.When Quadrature Phase Shift Keying (QPSK) is modulated, each RE can transmit the information of two bit 150a and 150b.The modulation of other type can be used, such as 16 quadrature amplitude modulation (QAM) or 64QAM to transmit the bit of greater number in each RE, or two-phase PSK (BPSK) modulation is with the bit (individual bit) transmitting lesser amt in each RE.RB can be arranged to the downlink transmission from eNodeB to UE, or RB can be arranged to the ul transmissions from UE to eNodeB.

Reference signal usually transmits via the resource element in Resource Block by OFDM symbol.Reference signal (or pilot signal or single-tone) can be the known signal for various reason (such as synchronization timing estimates the noise in channel and/or channel).Reference signal can be launched station and mobile communication equipment receives and transmits.Dissimilar reference signal (RS) can use in RB.Such as, in LTE system, downlink reference signal type can comprise cell specific reference signal (CRS), multicast broadcast single frequency network (MBSFN) reference signal, UE specific reference signals (specific RS or UE-RS of UE) or demodulated reference signal (DMRS), location reference signals (PRS) and channel state information reference signals (CSI-RS).

CRS can transmit in the community supporting PDSCH in downlink subframe.UE is transferred data to from eNodeB via PDSCH.When transmitting Physical Multicast Channel (PMCH) in the MBSFN subframe, MBSFN reference signal can be transmitted.UE-RS or DMRS can transmit in the downlink subframe supporting PDSCH.UE-RS (DMRS) can be sent to particular terminal (such as being allocated in the Resource Block that downlink sharied signal channel (DL-SCH) transmits, mobile communication equipment), for using multiple antenna to carry out beam forming to single UE, and for PDSCH demodulation.PRS can transmit in the RB in the downlink subframe being configured for PRS transmission, but may not be mapped to Physical Broadcast Channel (PBCH), master sync signal (PSS) or auxiliary synchronous signals (SSS).CSI-RS can be used for downlink channel quality.

Fig. 6 illustrates and is coordinating the example flow diagram of the Timing Synchronization 560 and additional Timing Synchronization 580 transmitted for down link (DL) in multiple spot (CoMP) system.Originally, PSS and/or CRS562 from cooperative nodes can be used to produce for the timing estimation of the receiver of wireless device.CoMP can be generated by least one cooperative nodes and measure group configuration 572.In another embodiment, receive CoMP by least one cooperative nodes from the controller core net and measure group configuration 572.At least one section of CoMP measurement group configuration can be sent to wireless device.The section being sent to the CoMP measurement group of wireless device can comprise for the cooperative nodes in the coordination group of the measurement of the specific RS of node (such as, CSI-RS).Additional Timing Synchronization can comprise the timing estimation for each CSI-RS antenna port in CoMP measurement group 582, and calculates synthesis reception RS timing 584, for adjusting or produce the actual timing of the receiver of wireless device from this estimated group timing.

On the basis only using PSS, SSS and/or CRS signal controlling Timing Synchronization; use the additional Timing Synchronization of specific RS or CSI-RS of node that receiver timing can be allowed to be adjusted; to receive OFDM data symbol from different cooperative nodes; within making most of OFDM symbol border drop on the protection interval of OFDM symbol, this can reduce ICI and ISI.Receiver timing can comprise the timing of receiver inter-process, find the timing on OFDM symbol border when receiver, or when receiver carries out or moment of the FFT that samples.Additional Timing Synchronization uses the some reception reference signal timings from different cooperative nodes, but not only from PSS, SSS and/or CRS signal of individual node.Each reception reference signal (RS) timing can be from i-th cooperative nodes, and wherein i is the positive integer of the node represented in CoMP measurement group.OFDM symbol border can in the signal received from i-th cooperative nodes, and i-th cooperative nodes can comprise service node.Receive RS timing value specific RS or CSI-RS of node from i-th cooperative nodes can be used to measure or generate.Timing can comprise possible delay, and such as transmitter (TX) delay, propagation delay, receiver (RX) postpone and other processing delay.

Fig. 7 illustrates ofdm demodulator, comprises in a wireless device for the FFT demodulator in the receiver (RX) of down link; And OFDM modulation device, be included in cooperative nodes for the IFFT modulator in the transmitter of down link.Additional Timing Synchronization can be used for the timing of OFDM symbol adjustment FFT demodulator.

Wireless communication system can be subdivided into the various parts being called layer.In LTE system, communication layers can comprise physics (PHY), medium education (MAC), radio link control (RLC), PDCP (PDCP) and radio resource and control (RRC) layer.As shown in Figure 7, physical layer can comprise the basic hardware transmission assembly of wireless communication system 400.Basic multiple-input and multiple-output (MIMO) system is used for simple declaration basic hardware transmission assembly, but described assembly is also applicable to complicated mimo system, SISO system or similar system.Such as; in mimo systems, at transmitter 410, binary system input data 420 are undertaken encoding protecting by using channel encoder 422; use interleaver 424 to carry out interweaving to resist fade-out, and use mapper 426 to carry out mapping to improve reliability.The data mapped can be separated into multiple layers for antenna port by transmitter (TX) beam-shaper 434, and can use modulator 428A-B that these layer of OFDM modulation is become OFDM symbol.Modulator can use invert fast fourier transformation (IFFT) algorithm to calculate inverse discrete Fourier transformer inverse-discrete (IDFT) to generate modulation signal (the vector x for each antenna port).Modulation signal can convert analog signal to by D-A converter (DAC) 430A-B.Analog signal can transmit via radio frequency (RF) transmitter (Tx) 432A-B, and radio frequency sending set is configured to send signal to transmitter antenna 440A-B, and antenna operable is with transmission of signal.Analog signal is called the path of channel 450 by following.Physical layer can comprise other assembly (not shown), such as go here and there-and (S/P) transducer-string (P/S) transducer, Cyclic Prefix (CP) inserter and canceller, boundary belt inserter and canceller and other assembly needed.

The signal transmitted by channel 450 may suffer noise 452 and interference 454.Noise and Interference is represented as the interpolation 456 on channel signal, and channel signal receives by the receiver antenna 490A-B of receiver 460 and one or more radio frequency (RF) receiver (Rx) 482A-B.The channel signal combined with Noise and Interference can convert digital modulation signals to by analog to digital converter (ADC) 480A-B.Digital signal can use demodulator 478A-B to carry out OFDM demodulation.Demodulator can use fast fourier transform (FFT) algorithm to calculate discrete Fourier transform (DFT) (DFT), to produce restituted signal (the vector y for each antenna port).Channel estimator 462 can use restituted signal to estimate channel 450 and to occur Noise and Interference in the channel.Channel estimator can comprise feedback generator or communicate with feedback generator, feedback generator can generate physics uplink shared channel (PUSCH) feedback report, such as CQI (CQI) report, precoding matrix indicators (PMI) report or transmission rank designator (RI) report.CQI can be used to assist MIMO transmission pattern.Restituted signal can use MIMO decoder 484 to combine, make to spend mapper 476 to carry out mapping, deinterleaver 474 is used to carry out deinterleaving, and decoded by channel decoder 472, thus generating binary system output data 470, binary system exports other layer of use that data 470 can be received station.

As illustrated in the flowchart of Figure 8, another example provides a kind of method 500 of the receiver timing for adjusting wireless device in coordination multiple spot (CoMP) system.The instruction that the method can be used as on machine performs, and wherein instruction is included at least one computer-readable medium or a kind of non-transitory machinable medium.The method is included in wireless device receives multiple node specific reference signals (RS) operation from the multiple cooperative nodes the coordination group of CoMP system, and wherein, coordination group comprises at least two cooperative nodes, as indicated in block 510.Then carry out receiving RS operation regularly from the synthesis of multiple reception RS timing estimation, multiple reception RS timing generates from the specific RS of multiple node, wherein, receives the timing of RS timing expression from least two cooperative nodes, as shown in frame 520.Next operation of the method can be receive the timing of RS timing adjustment receiver, as shown in frame 530 based on synthesis at least partly.

The specific RS of node can comprise channel state information reference signals (CSI-RS).The receiver timing adjusted can be the time of the fast fourier transform (FFT) of the receiver process received signal of wireless device.

In one embodiment, estimate that the operation of synthesis reception RS timing can comprise further: for synthesis receives RS timing selection reception RS timing the earliest.Synthesis receives RS timing can be by represent, wherein, τ _pDSCHbe physical down link sharing channel (PDSCH) regularly, be each in the channel state information reference signals (CSI-RS) the calculated timing of CoMP measurement group, min () is minimum value function, and i is the positive integer of the node represented in CoMP measurement group.

In another embodiment, estimate that synthesis receives RS operation regularly and can comprise further: select the receiver RS timing in fact between minimum reception RS timing and maximum reception RS timing.Minimum reception RS timing can comprise the timing generated from the specific RS of first node received of the first cooperative nodes, and maximum reception RS timing can comprise the timing generated from the specific RS of the node finally received of last cooperative nodes.In one example, determine that synthesis receives RS timing by the Reference Signal Received Power (RSRP) for cooperative nodes and the combination of reception RS timing that generates from the specific RS of the node of cooperative nodes.In another example, synthesis receive RS timing can be by represent, wherein, τ _pDSCHbe physical down link sharing channel (PDSCH) regularly, each in the channel state information reference signals (CSI-RS) the calculated timing of CoMP measurement group, be CSI-RS antenna port Reference Signal Received Power (RSRP), i is the positive integer of the node represented in CoMP measurement group, and f () is the monotonic function of its independent variable.

The method also can comprise wireless device and send the timing feedback comprising synthesis reception RS timing to cooperative nodes.In another example, the method also can comprise wireless device and sends the timing feedback comprising the reception RS timing always generated from the specific RS of the node of cooperative nodes to cooperative nodes.The specific RS of node can comprise master sync signal (PSS), auxiliary synchronous signals (SSS), cell specific reference signal (CRS) or channel state information reference signals (CSI-RS).

As shown in the flow chart in Fig. 9, another example provides a kind of method 600 synchronous relative to the downlink transmission of the second cooperative nodes for the timing making the down link of the first cooperative nodes (DL) transmit in coordination multiple spot (CoMP) system.The instruction that the method can be used as on machine performs, and wherein instruction is included at least one computer-readable medium or on a kind of non-transitory machinable medium.The method is included in the first cooperative nodes receives timing feedback operation from wireless device, and wherein at least one comprising from the specific RS generation of the node of at least one cooperative nodes of timing feedback receives reference signal (RS) regularly, as shown in frame 610.Next carry out using timing feedback to be modified in the operation of the downlink transmission timing of the first cooperative nodes by adjustment timing, as indicated in block 620.

Timing feedback comprises synthesis and receives RS timing or the first cooperative nodes reception RS timing.RS timing can be received from multiple reception RS timing estimation synthesis of the timing represented from least two cooperative nodes.First cooperative nodes receives RS timing and can generate from the specific RS of node from the first cooperative nodes.These receive RS timing and can generate from the specific RS of multiple node.

In one example, synthesis reception RS timing can comprise the first cooperative nodes reception RS timing generated from the specific RS of node from the first cooperative nodes.Node specific reference signals comprises channel state information reference signals (CSI-RS).Downlink transmission comprises data or physical down link sharing channel (PDSCH).Amendment downlink transmission timing operation can comprise further based on synthesis receive RS timing or the first cooperative nodes receive RS timing, skew be used for downlink transmission down link signal invert fast fourier transformation (IFFT) regularly.The method also can comprise: the first cooperative nodes (such as, sending cooperative nodes) selects selected cooperative nodes from multiple cooperative nodes.The specific RS of node from selected cooperative nodes can be used for generating synchronous RS timing by wireless device, and synchronous RS timing can be used to received data or receive the Timing Synchronization of physical down link sharing channel (PDSCH).First cooperative nodes can transmit the selection of selected cooperative nodes to wireless device.Synchronous RS timing can be used to adjust and receives the receiver of the wireless device of PDSCH regularly for received data or institute.The method also can comprise: before reception timing feedback, the specific RS of the first cooperative nodes transmission node is to wireless device.

Figure 10 illustrates in the example collaboration node 710A-B coordinated in multiple spot (CoMP) system and exemplary wireless device 720.Cooperative nodes can comprise grand node (such as, grand eNB) or low power nodes (such as, micro-eNB, slight eNB, femto eNB, or HeNB).

Wireless device 720 (such as, UE) can communicate with cooperative nodes 710A-B.Wireless device can comprise timing estimation equipment 718, is coordinating the receiver timing of the wireless device in multiple spot (CoMP) system for estimating.Timing estimation equipment can comprise down-link reception module 722 and timing estimator 724.In certain embodiments, timing estimation equipment can comprise timing adjustment module 726 and up link (UL) delivery module 728.Wireless device can comprise and be configured to receive DL transmission information from cooperative nodes and transmit the transceiver of UL transmission information to cooperative nodes.

Down-link reception module 722 multiple cooperative nodes that can be configured to the coordination group of wireless device from CoMP system receive multiple node specific reference signals (RS).Coordination group can comprise at least two cooperative nodes.Down-link reception module also can be configured to receive the selection of selected cooperative nodes.Selected cooperative nodes can be selected by a cooperative nodes among the controller in core net or multiple cooperative nodes.The specific RS of node from selected cooperative nodes can be used for producing synchronous RS timing by wireless device, and synchronous RS timing can be used for Timing Synchronization or adjustment receives the receiver of the wireless device of physical down link sharing channel (PDSCH) regularly for received data or institute.Timing estimator 724 can be configured to receive RS timing from multiple reception RS timing estimation synthesis, and multiple reception RS timing generates from the specific RS of multiple node.Reception RS timing can represent the timing from least two cooperative nodes.The specific RS of node comprises channel state information reference signals (CSI-RS).In one example, timing estimator can be configured to select the timing of reception RS the earliest for the synthesis of receiving RS timing.Synthesis receives RS timing can be by represent, wherein, τ _pDSCHbe physical down link sharing channel (PDSCH) regularly, be each in the channel state information reference signals (CSI-RS) the calculated timing of CoMP measurement group, min () is minimum value function, and i is the positive integer of the node represented in CoMP measurement group.In another example, timing estimator can be configured to use synthesis to receive the receiver RS timing of RS timing selection in fact between minimum reception RS timing and maximum reception RS timing.In another example, timing estimator can be configured to from the Reference Signal Received Power (RSRP) for cooperative nodes and determine that synthesis receives RS timing from the reception RS combination regularly that the specific RS of the node of cooperative nodes generates.Synthesis receive RS timing by represent, wherein, τ _pDSCHbe physical down link sharing channel (PDSCH) regularly, each in the channel state information reference signals (CSI-RS) the calculated timing of CoMP measurement group, be CSI-RS antenna port Reference Signal Received Power (RSRP), i is the positive integer of the node represented in CoMP measurement group, and f () is the monotonic function of its independent variable.

Timing adjustment module 726 can be configured to receive RS timing based on synthesis and adjust receiver timing.The receiver timing adjusted can be the time of the fast fourier transform (FFT) of the receiver process received signal of wireless device.This time can represent the border of FFT window.Up link delivery module 728 can be configured to comprise to cooperative nodes transmission the timing feedback of reception RS timing that synthesis receives RS timing or always generate from the specific RS of the node of cooperative nodes.Wireless device can comprise subscriber equipment (UE) and travelling carriage (MS).Wireless device can be configured at least one that be connected in WLAN (wireless local area network) (WLAN), wireless personal-area network (WPAN) and wireless wide area network (WWAN).Wireless device can comprise antenna, touch-sensitive display panel, loud speaker, microphone, graphic process unit, application processor, internal storage or nonvolatile memory port.

Each cooperative nodes 710A-B can comprise Timing Synchronization equipment 708A-B, for synchronous relative to the downlink transmission of the second cooperative nodes in the timing coordinating to make the down link of the first cooperative nodes (DL) transmit in multiple spot (CoMP) system.Timing Synchronization equipment can comprise down link delivery module 712A-B, extended receiver module 714A-B and timing modified module 716A-B.In one example, Timing Synchronization equipment can comprise selection module (not shown).In another example, select module can in involved controller in the core network.Cooperative nodes in the coordination group 740 of CoMP system, and can communicate mutually via back haul link 750.Back haul link can comprise X2 signaling via wired connection, wireless connections or Fiber connection or back haul link signaling.Communication between cooperative nodes can comprise CoMP measurement group information.

Extended receiver module 714A-B can be configured to receive timing feedback from wireless device.At least one that can comprise from the specific RS generation of the node of at least one cooperative nodes of timing feedback receives reference signal (RS) regularly.Timing feedback can comprise synthesis and receive reference signal (RS) timing or the first cooperative nodes reception RS timing.Synthesis receives RS timing and can estimate from multiple the receptions RS timing represented from the timing of at least two cooperative nodes, and receive RS timing can from the specific RS generation of multiple node.First cooperative nodes receives RS timing and can generate from the specific RS of node from the first cooperative nodes.Timing modified module 716A-B can be configured to use timing feedback by adjustment timing in the first cooperative nodes amendment downlink transmission timing.Node specific reference signals comprises channel state information reference signals (CSI-RS).Timing modified module also can be configured to receive RS timing or cooperative nodes reception RS timing by synthesis, and skew is used for the invert fast fourier transformation (IFFT) of the down link signal of downlink transmission regularly.Down link delivery module 712A-B can be configured to the specific RS of transmission node to wireless device.Select module can be configured to select selected cooperative nodes from multiple cooperative nodes.The specific RS of node from selected cooperative nodes can be used for generating synchronous RS timing by wireless device, and synchronous RS timing can be used for received data or receive the Timing Synchronization of physical down link sharing channel (PDSCH).Down link delivery module also can be configured to transmit the selection of selected cooperative nodes to wireless device.Synchronous RS timing can be used to adjust and receives the receiver of the wireless device of PDSCH regularly for received data or institute.Cooperative nodes can comprise grand node, low power nodes (LPN), grand evolved NodeB (grand eNB), micro-eNB, slightly eNB, femto eNB or family eNB (HeNB).

Figure 11 provides the example of the wireless device of the mobile wireless device of such as subscriber equipment (UE), travelling carriage (MS), mobile wireless device, mobile communication equipment, flat board, hand-held set or other type and so on to illustrate.Wireless device can comprise one or more antenna, described antenna configuration is the node with such as grand node, low power nodes (LPN) and so on, or such as base station (BS), evolved NodeB (eNB), Base Band Unit (BBU), remote radio heads (RRH), remote radio devices (RRE), relay station (RS), wireless device (RE) or other type the transfer station of wireless wide area network (WWAN) access point and so on communicate.Wireless device can be configured to that use comprises 3GPPLTE, WiMAX, high-speed packet access (HSPA), bluetooth communicate with at least one wireless communication standard of WiFi.Wireless device can use the antenna separated for each wireless communication standard to communicate, or uses the common antenna being used for multiple wireless communication standard to communicate.Wireless device can communicate in WLAN (wireless local area network) (WLAN), wireless personal-area network (WPAN) and/or WWAN.

Figure 11 also provides the diagram of microphone and the one or more loud speaker that can be used for from the audio frequency input and output of wireless device.Display screen can be the display screen of liquid crystal display (LCD) screen or other type, such as Organic Light Emitting Diode (OLED) display.Display screen can be configured to touch-screen.Touch-screen can use electric capacity, resistance or the touch screen technology of other type.Application processor and graphic process unit can be coupled to internal storage, to provide process and display capabilities.Nonvolatile memory port also can be used to provide data I/O option to user.Nonvolatile memory port also can be used for the memory function of extended wireless device.Keyboard can be integrated or be wirelessly connected to wireless device with wireless device, to provide extra user's input.Also touch-screen can be used to provide dummy keyboard.

(namely various technology or its some aspect or part can take the program code that realizes in the tangible medium of such as floppy disk, CD-ROM, hard disk drive, non-transitory computer-readable recording medium or other machinable medium any and so on, instruction) form, wherein, when program code to be loaded in machine (such as computer) and to be performed by machine, this machine becomes the device for realizing various technology.When program code performs on programmable computers, computing equipment can comprise processor, storage medium that processor can read (comprising volatibility and nonvolatile memory and/or memory element), at least one input equipment and at least one output equipment.Volatibility and nonvolatile memory and/or memory element can be RAM, EPROM, flash drive, CD-ROM drive, magnetic hard disk drives or other medium for storage of electronic.Base station and wireless device also can comprise transceiver module, counter module, processing module and/or clock module or timer module.Can realize or utilize one or more programs of various technology described herein can use API (API), control etc. can be used again.This class method can realize communicating with computer system by high level procedural or OO programming language.But if necessary, this (these) program can assembler language or machine language realize.Under any circumstance, language can be compiling or interpretative code, and combines with hardware implementing.

Should be appreciated that in the functional unit described in this manual to have and be manyly marked as module, so as more specifically to emphasize them realize independence.Such as, module can be implemented as hardware circuit, comprising customization VLSI circuit or gate array, as the existing semiconductor of logic chip and so on, and transistor or other discrete component.Module also can realize in the programmable hardware device of such as field programmable gate array, programmable logic array, programmable logic device etc.

Module also can realize in the software performed for various types of processor.The identification module of executable code such as can comprise one or more physics or the logical block of computer instruction, and these computer instructions such as can be organized as object, process or function.But the executable code of identification module is not necessarily positioned at together physically, but can comprise the different instruction being stored in diverse location, they are when being logically bonded together, and comprise module and realize the described object of module.

In fact, the module of executable code can be single instruction perhaps multiple instruction, and even can be distributed on some different code segments, among distinct program, and across some memory devices.Similarly, operating data can be identified and be shown in module in this article, and can be implemented as any suitable form and be organized in the data structure of any suitable type.Operating data can be collected as individual data collection, or can be distributed in different positions, is included in different storage device, and can only exist as the electronic signal in system or network at least partly.Module can be passive or active, comprises the agency that can operate to perform required function.

Run through " example " that this specification mentions to mean, the specific features, structure or the characteristic that describe in conjunction with this example are included at least one embodiment of the present invention.Therefore, run through the phrase " in one example " that this specification occurs in various position and not necessarily all refer to same embodiment.

As used herein, conveniently, multiple project, structural detail, element and/or material can be present in common list.But, these lists should be interpreted as list each member by be designated respectively separately with the member of uniqueness.Therefore, when not indicating on the contrary, any one member in this list should only not present based on them and be interpreted as the actual equivalent of other member any in same list in common group.In addition, various embodiment of the present invention may be mentioned in this article with example together with the alternative for its various assembly.Should be appreciated that this kind of embodiment, example and alternative are not interpreted as actual equivalent each other, and should be considered to of the present invention that separate and independently represent.

In addition, described feature, structure or characteristic can combine in one or more embodiments in any suitable manner.In the following description, many concrete details are provided, such as the example of layout, distance, network example etc., to understand embodiments of the invention up hill and dale.But those skilled in the relevant art will recognize, the present invention or can adopt other method, assembly, layout etc. to implement when not have in described detail one or more.In other situation, do not illustrate or describe well-known structure, material or operation in detail, in order to avoid make each aspect of the present invention become obscure.

Although aforementioned exemplary is the explanation to the principle of the present invention in one or more application-specific, but those of ordinary skill in the art can be clear, do not pay creative work and do not depart from principle of the present invention and design, just can make form, using and realizing the multiple amendment in details.Therefore, the invention is intended to only be limited by the claim stated below.

Claims

1., for coordinating the receiver method regularly adjusting subscriber equipment (UE) in multiple spot (CoMP) configuration, comprising:

Multiple nodes the coordination group of described UE from described CoMP system receive multiple node specific reference signals (RS), and wherein, described coordination group comprises at least two nodes;

Produce the specific RS timing of the multiple nodes received by the antenna port for described at least two nodes;

From the average constant time lag of multiple reception RS timing estimation, wherein said average constant time lag comprises transmitter (TX) delay, propagation delay, receiver (RX) delay or other processing delay; And

The receiver timing of described UE is adjusted at least partly based on described average constant time lag.

2. method according to claim 1, wherein, receive the specific RS of multiple node from multiple cooperative nodes and use channel state information reference signals (CSI-RS) antenna port or UE specific reference signals (specific RS or UE-RS of UE) antenna port that are associated with downlink transmission, and described downlink transmission comprises data or physical down link sharing channel (PDSCH).

3. method according to claim 1, wherein, the specific RS of described node comprises channel state information reference signals (CSI-RS).

4. method according to claim 1, wherein, the receiver timing adjusted is the time of the fast Fourier transform (FFT) of the receiver process received signal of described UE.

5. method according to claim 1, wherein, the specific RS of described node comprises master sync signal (PSS), auxiliary synchronous signals (SSS), cell specific reference signal (CRS), subscriber equipment specific reference signals (specific RS or UE-RS of UE) or channel state information reference signals (CSI-RS).

6. method according to claim 1, wherein, described multiple node is cooperative nodes.

7. at least one non-transitory machine readable media, comprises multiple instruction, and described multiple instruction is suitable for the method being performed to realize claim 1.

8., for coordinating a receiver timing estimation equipment regularly for estimating user equipment (UE) in multiple spot (CoMP) configuration, comprising:

Descending link receiver, the described descending link receiver multiple cooperative nodes be configured to the coordination group of described UE from described CoMP system receive multiple node specific reference signals (RS), wherein, described coordination group comprises at least two cooperative nodes, and described descending link receiver uses channel state information reference signals (CSI-RS) antenna port and subscriber equipment specific reference signals (specific RS or UE-RS of UE) antenna port that are associated with downlink transmission, and described downlink transmission comprises data or physical down link sharing channel (PDSCH), and

Timing estimator, described timing estimator is configured to estimate that synthesis receives RS timing from multiple reception RS timing, described multiple reception RS timing generates from the specific RS of described multiple node, and wherein, described reception RS timing represents the timing from described at least two cooperative nodes.

9. timing estimation equipment according to claim 8, wherein, average retardation between the RS that the antenna port that synthesis receives at least two cooperative nodes described in RS timing expression receives, wherein said average retardation comprises transmitter (TX) delay, propagation delay, receiver (RX) delay or other processing delay.

10. timing estimation equipment according to claim 8, wherein, described descending link receiver uses the transmission mode being used for CoMP configuration.

11. timing estimation equipment according to claim 8, also comprise:

Timing adjustment module, described timing adjustment module is configured to receive RS timing based on described synthesis and adjusts the timing of described receiver.

12. timing estimation equipment according to claim 11, wherein, the receiver timing adjusted is the time of the fast Fourier transform (FFT) of the receiver process received signal of described UE.

13. timing estimation equipment according to claim 8, wherein, described timing estimator is configured to as described synthesis receives RS timing selection reception RS timing the earliest.

14. timing estimation equipment according to claim 13, wherein, described synthesis receive RS timing by represent, wherein, be physical down link sharing channel (PDSCH) regularly, be each in the channel state information reference signals (CSI-RS) the calculated timing of CoMP measurement group, min () is minimum value function, and iit is the positive integer of the node represented in described CoMP measurement group.

15. timing estimation equipment according to claim 8, wherein, described timing estimator is configured to the receiver RS timing selected in fact between minimum reception RS timing and maximum reception RS timing.

16. timing estimation equipment according to claim 15, wherein, described synthesis receive RS timing by represent, wherein, be physical down link sharing channel (PDSCH) regularly, each in the channel state information reference signals (CSI-RS) the calculated timing of CoMP measurement group, cSI-RS antenna port Reference Signal Received Power (RSRP), ibe the positive integer of the node represented in CoMP measurement group, and f () is the monotonic function of function argument.

17. timing estimation equipment according to claim 8, also comprise:

Link transmitter, described link transmitter is configured to cooperative nodes transmission timing feedback, and described timing feedback comprises described synthesis and receives RS timing.

18. timing estimation equipment according to claim 8, wherein, described UE comprises described timing estimation equipment, and described UE is configured to be connected to wireless lan (wlan), wireless personal-area network (WPAN) or wireless wide area network (WWAN), wherein, described UE comprises antenna, touch-sensitive display panel, loud speaker, microphone, graphic process unit, application processor, internal storage or nonvolatile memory port.

19. 1 kinds in the timing method synchronous relative to the downlink transmission of the second cooperative nodes coordinating to make the down link of the first cooperative nodes (DL) transmit in multiple spot (CoMP) configuration, comprising:

Receive timing feedback at described first cooperative nodes from subscriber equipment (UE), wherein, timing feedback comprises at least one reception RS timing generated from the node specific reference signals (RS) of at least one cooperative nodes; And

Use described timing feedback by adjustment timing in described first cooperative nodes amendment downlink transmission timing.

20. methods according to claim 19, wherein, described timing feedback comprises synthesis and receives RS timing or described first cooperative nodes reception RS timing, wherein, by representing from multiple reception RS timing of the timing of at least two cooperative nodes or estimating that described synthesis receives RS timing by the first cooperative nodes reception RS timing generated from the specific RS of node from described first cooperative nodes, and described reception RS timing is from the specific RS generation of described multiple node.

21. methods according to claim 20, wherein, average retardation between the RS that the antenna port that synthesis receives at least two cooperative nodes described in RS timing expression receives, wherein said average retardation comprises transmitter (TX) delay, propagation delay, receiver (RX) delay or other processing delay.

22. methods according to claim 19, wherein, described node specific reference signals comprises channel state information reference signals (CSI-RS), and described downlink transmission comprises data or physical down link sharing channel (PDSCH).

23. methods according to claim 19, wherein, the timing of amendment downlink transmission comprises further:

Receive RS timing or described first cooperative nodes according to described synthesis to receive RS timing and offset the invert fast fourier transformation (IFFT) of the down link signal for described downlink transmission regularly, wherein offset described IFFT timing and comprise and make described IFFT constant time lag or in advance.

24. methods according to claim 19, are also included in before receiving described timing feedback:

From multiple cooperative nodes, selected cooperative nodes is selected at described first cooperative nodes, wherein, the specific RS of node from described selected cooperative nodes is used for generating synchronous RS timing by described UE, and described synchronous RS timing be used to received data or receive the Timing Synchronization of physical down link sharing channel (PDSCH);

Transmit the selection of described select cooperative nodes to described UE, wherein, described synchronous RS timing be used to adjust for received data or receive the receiver of the described UE of PDSCH regularly; And

Use channel state information reference signals (CSI-RS) antenna port or UE specific reference signals (specific RS or UE-RS of UE) antenna port that are associated with downlink transmission, from described first cooperative nodes to the specific RS of described UE transmission node, and described downlink transmission comprises data or physical down link sharing channel (PDSCH).

25. at least one non-transitory machine readable media, comprise multiple instruction, and described multiple instruction is suitable for the method being performed to realize claim 19.