WO2013135185A1 - Procédé de communication, équipement d'utilisateur et dispositif côté réseau - Google Patents

Procédé de communication, équipement d'utilisateur et dispositif côté réseau Download PDF

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Publication number
WO2013135185A1
WO2013135185A1 PCT/CN2013/072633 CN2013072633W WO2013135185A1 WO 2013135185 A1 WO2013135185 A1 WO 2013135185A1 CN 2013072633 W CN2013072633 W CN 2013072633W WO 2013135185 A1 WO2013135185 A1 WO 2013135185A1
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Prior art keywords
downlink
signal
network side
side device
downlink signal
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PCT/CN2013/072633
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English (en)
Chinese (zh)
Inventor
周明宇
周永行
夏亮
任晓涛
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华为技术有限公司
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Publication of WO2013135185A1 publication Critical patent/WO2013135185A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H04L27/2663—Coarse synchronisation, e.g. by correlation

Definitions

  • the present invention relates to the field of communications, and more particularly to a communication method, a user equipment, and a network side device. Background of the invention
  • the network side device sends a downlink signal to the UE, and the UE may determine, according to the received downlink signal, a start time of the received downlink signal (ie, determine a downlink synchronization timing), and according to the downlink synchronization timing. Receive signals at other times.
  • the UE usually only communicates with one node, so only needs to keep synchronization with one node. For example, the UE determines downlink synchronization timing according to the downlink synchronization signal sent by the node, and receives the downlink synchronization timing according to the downlink synchronization timing. Other signals sent by the node.
  • CoMP Coordinated Multiple Point
  • An aspect of the present invention provides a communication method, a user equipment, and a network side device, which can provide High downlink signal transmission efficiency.
  • a communication method including: determining a first downlink synchronization timing according to a detection signal received from a network side, and determining a second downlink synchronization timing; receiving a first downlink signal according to the first downlink synchronization timing, Receiving the second downlink signal according to the second downlink synchronization timing.
  • a communication method including: the control node controls the first network side device and the second network side device to send a detection signal to the user equipment UE, where the detection signal is used by the UE to determine the first time according to the detection signal.
  • the line synchronization timing determines the second downlink synchronization timing; the control node controls the first network side device to send the first downlink signal to the UE, and controls the second network side device to send the second downlink signal to the UE.
  • a user equipment including: a determining module, configured to determine a first downlink synchronization timing according to a detection signal received from a network side, and determine a second downlink synchronization timing; and a receiving module, configured to The downlink synchronization timing receives the first downlink signal, and receives the second downlink signal according to the second downlink synchronization timing.
  • a network side device including: a first control module, configured to control, by the first network side device and the second network side device, to send a detection signal to the user equipment UE, where the detection signal is used by the UE according to the The detection signal determines the first downlink synchronization timing and determines the second downlink synchronization timing; the second control module is configured to control the first network side device to send the first downlink signal to the UE, and control the second network side device to the UE Send a second downlink signal.
  • the technical solution can enable the UE to receive different downlink signals according to different downlink synchronization timings to avoid interference between the signals, thereby improving the transmission efficiency of the downlink signals.
  • FIG. 1A is a schematic diagram of a frame structure of an LTE system.
  • FIG. 1B is a schematic diagram showing a downlink signal received by a UE by a network side device.
  • FIG. 1C is a schematic diagram showing a downlink signal that a UE receives different network side devices.
  • FIG. 2 is a schematic flow chart of a communication method in accordance with an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of a communication method according to an embodiment of the present invention.
  • 4A is a schematic diagram of mapping of reference signals in a physical resource block.
  • 4B is a schematic diagram of time division multiplexing of PDSCH and PDCCH.
  • 4C is a schematic diagram of PDSCH and PDCCH frequency division multiplexing.
  • FIG. 5A is a schematic diagram of downlink signals transmitted by different network side devices. Figure.
  • FIG. 6 is a schematic flow chart of a communication process in accordance with an embodiment of the present invention.
  • FIG. 7 is a schematic flow chart of a communication process in accordance with another embodiment of the present invention.
  • FIG. 8 is a structural schematic diagram of a user equipment according to another embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a network side device according to another embodiment of the present invention. Mode for carrying out the invention
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • Advanced-LTE Advanced Long Term Evolution
  • UMTS Universal Mobile Telecommunication System
  • the network elements of the radio access network in LTE (Long Term Evolution) and LTE-A (Long Term Evolution-Advanced) include eNB (eNodeB, evolved base station), WCDMA (Wideband Code Division) Multiple Access, Wideband Code Division Multiple Access)
  • the network elements of the radio access network include RNC (Radio Network Controller) and NodeB.
  • WiMax Worldwide Interoperability for Microwave Access, Global Interoperability for Microwave Access
  • Other wireless networks may also use a similar solution to the embodiment of the present invention, but the related modules in the base station system may be different.
  • the embodiments of the present invention are not limited, but for convenience of description, the following embodiments will take an eNodeB as an example. Description.
  • the user equipment includes but is not limited to a mobile station (MS, Mobile Station), a mobile terminal (Mobile Terminal), a mobile telephone (Mobile Telephone), a mobile phone (handset). And a portable device (ortable equipment), etc., the user equipment can communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment can be a mobile phone (or "cellular" Telephone), a computer with wireless communication function, etc., and the user equipment can also be a portable, pocket-sized, handheld, computer-integrated or in-vehicle mobile device.
  • RAN Radio Access Network
  • the CoMP transmission technology introduces cooperation between a plurality of network side devices (also referred to as nodes), and shares information (for example, channel state information, scheduling information, and data information, etc.) between the network side devices to eliminate inter-cell interference.
  • Embodiments according to the present invention may be applied to a coordinated multipoint transmission technique, however, embodiments according to the present invention are not limited thereto, and embodiments of the present invention may be applied to multiple networks.
  • the network side device (or node) sends a downlink signal to the UE.
  • FIG. 1A is a schematic diagram of a frame structure of an LTE system.
  • a radio frame includes 10 Transmission Time Intervals (TTIs), each of which includes 14 symbols, and each symbol (for example, an OFDM symbol) is composed of a Cyclic Prefix (CP) signal portion. It is composed of OFDM signal parts with lengths of d-cp and d-ofdm.
  • the CP signal portion is a copy of the last portion of the OFDM signal portion.
  • FIG. 1B is a schematic diagram showing a downlink signal received by a UE by a network side device.
  • the network side device sends a downlink wireless signal. Since the wireless signal experiences different paths in the air, the downlink wireless signals that experience different paths arrive at the UE with different delays. If the downlink wireless signal experiences a distance d from the network side device to the UE, the UE receives the downlink wireless signal at time t1+d/c (c indicates the speed of electromagnetic wave transmission 3 108 m/s), and FIG. 1B shows the downlink.
  • the wireless signal reaches the UE through three paths, the corresponding distances are dl, d2, and d3, respectively, and the signals received by the UE are superpositions of these signals. Due to the existence of the CP, the UE can intercept the signal of length d-ofdm from time t2. For the three paths, the intercepted signals only include the signals of the same symbol, so that inter-symbol interference is not introduced. If there is no CP, the partial signals at the forefront of the second path and the third path belong to the previous symbol. At this time, if the signal is intercepted according to the OFDM signal window shown in Fig. 1B, inter-symbol interference is caused.
  • the downlink signal sent by the network side device can be sent in the format of FIG. 1B. If only one network side device sends a downlink signal to the UE, the UE may only need to determine one downlink synchronization, and may acquire other signals according to the format of FIG. 1B. For example, in one TTI, the UE may only be based on the network side device.
  • the downlink synchronization signal transmitted on the first symbol determines the downlink synchronization timing, and then receives all other symbols according to the determined downlink synchronization timing (for example, receiving a second symbol from 1 symbol after the time t2), that is, in the prior art In the UE, the UE only needs to receive all downlink signals according to a single synchronization timing.
  • FIG. 1C is a schematic diagram showing a downlink signal that a UE receives different network side devices.
  • the network side device serves the same UE, there is a problem that if the prior art is used, the UE determines that the downlink synchronization signal corresponding to the downlink synchronization (for example, the signal is sent by the network side device 1) may be related to other signals. (Sent by the network side device 2) is not from the same network side device, which introduces intersymbol interference, making the transmission efficiency of the CoMP technology not high.
  • the network side device 1 is a macro station
  • the network side device 2 is a micro station.
  • the distance between the macro station and the UE is farther than the distance between the micro station and the UE, and the transmission power of the macro station is greater than the transmission power of the micro station, so that the UE is more Close to the network side device 2, however, due to the difference in transmission power between the two network side devices, the power of the signals received by the UE on the network side device 1 and the network side device 2 is not much different, and therefore, the signals they transmit are mutually The impact can not be ignored.
  • the UE receives the signal of the first path sent by the network side device 1 because the distance between the network side device 1 and the UE is large. If the UE receives the signal of the first path sent by the network side device 2, the UE receives the signals from the network side device 1 and the network side device 2 according to the downlink synchronization corresponding to the network side device 1 by using the prior art. Can cause intersymbol interference.
  • the UE first determines an OFDM signal window according to the downlink synchronization of the network side device 1, and intercepts the signal in the OFDM signal window, and the signal received from the network side device 1 is not affected by the intersymbol interference, and For the signal received from the network side device 2, since the signal arrives at the UE earlier than the signal sent by the network side device 1, the signal of the next symbol is also included in the OFDM signal window (such as the black part signal in FIG. 1C). , that is, the intersymbol interference is introduced.
  • the time given above may be the time relative to the starting point of a symbol.
  • the signal transmitted by the network side device 1 is a symbol numbered 0 (ie, for the network side device 1, tl is The starting point of the symbol numbered 0;)
  • the signal sent by the network side device 2 is the symbol numbered 2 (ie, for the network side device 2, tl is the starting point of the symbol numbered 2;);
  • the inter-symbol interference occurs when the downlink synchronization timing is determined based on the signal transmitted by the network side device 1 on the symbol numbered 0, and the signals after the two symbols are received according to the downlink synchronization timing.
  • 2 is a schematic flow chart of a communication method in accordance with an embodiment of the present invention. The method of Figure 2 is performed by a user equipment.
  • the first downlink signal and the second downlink signal may be respectively sent by the first network side device and the second network side device on the network side on the same carrier.
  • the first network side device and the second network side may be implemented as a base station, an access point (AP), a remote radio equipment (RRE), and a remote radio head (RRH). , Remote Radio Unit (RRU) or Relay Network Node (Relay Node).
  • the detection signal may be a downlink synchronization signal for determining the downlink synchronization timing of the downlink signal.
  • the first downlink synchronization timing and the second downlink synchronization timing are respectively directed to the first downlink signal and the second downlink signal.
  • Different downlink synchronizations may enable the UE to receive signals from the first network side device according to the first downlink synchronization timing, and then receive signals from the second network side device according to the second downlink synchronization timing, thereby ensuring
  • the downlink synchronization signal used by the UE to determine the downlink synchronization timing of the downlink signal is from the same network side device as the downlink signal.
  • the UE can receive different downlink signals according to different downlink synchronization timings to avoid inter-symbol interference received by the signals, thereby improving the transmission efficiency of the downlink signals.
  • a first downlink synchronization timing may be determined according to the received first detection signal, and a second downlink synchronization timing is determined according to the received second detection signal.
  • the network side device may send a signal for detecting sequence modulation to the UE, so that the UE can acquire downlink synchronization by using the signal modulated by the detection sequence.
  • the UE can be based on the first detection
  • the sequence modulated signal acquires a first downlink synchronization, and the signal modulated by the first detection sequence includes but is not limited to a Common Reference Signal (CRS) or a Channel State Information-Reference Signal (CSI-RS).
  • CRS Common Reference Signal
  • CSI-RS Channel State Information-Reference Signal
  • the UE may acquire the second downlink synchronization timing according to the signal modulated by the second detection sequence, and the signal of the second detection sequence modulation includes but is not limited to CRS or CSI-RS.
  • the method of FIG. 2 further includes: receiving information corresponding to the first detection signal, wherein in 210, the first detection signal may be received according to the information corresponding to the first detection signal And determining a first downlink synchronization timing according to the first detection signal.
  • the method of FIG. 2 further includes: receiving information corresponding to the second detection signal, wherein in 210, the second detection signal may be received according to the information corresponding to the second detection signal And determining a second downlink synchronization timing according to the second detection signal.
  • the network side device may send information corresponding to the first downlink synchronization to the UE, and after receiving the information, the UE receives the signal modulated by the first detection sequence according to the information.
  • the network side device may also send information corresponding to the second downlink synchronization to the UE, and after receiving the information, the UE receives the signal modulated by the second detection sequence according to the information.
  • the body that sends the information to the UE is not limited, and may be the first network side device, the second network side device, or other network side device, or may be a combination of these devices, such as the first network side device and the second network side device.
  • the information is jointly sent to the UE; the information may include time-frequency grid points and sequence information (eg, number of sequences), and the UE may know, according to the information, which sequence-modulated signals are received at which time-frequency grid points. Used to determine downlink synchronization.
  • the embodiment according to the present invention is not limited thereto, and the network side device may not be required to transmit the synchronization corresponding information to the UE, and receive the sequence modulated signal according to the existing information.
  • the time-frequency grid point may be determined according to the cell ID detected by the UE during the access network, and the first detection sequence modulated signal or the second detection sequence modulated signal is received at the time-frequency grid point.
  • the sequence modulated signal may also be obtained by using the cell ID, and the manner (or formula) of acquiring the time-frequency grid point according to the cell ID and acquiring the sequence modulated signal according to the cell ID may be preset on the UE and the network side.
  • the UE may not need to send the synchronization corresponding information to the UE to receive the first detection sequence modulated signal.
  • the network side device may send the second downlink synchronization to the UE.
  • the information after receiving the information, the UE receives the signal modulated by the second detection sequence according to the information.
  • determining a first downlink synchronization timing according to the received first detection signal determining a first downlink synchronization timing according to the received first detection signal; receiving synchronization deviation information from the network side, where the synchronization deviation information indicates downlink transmission of the first downlink signal a difference between the time and the downlink transmission time of the second downlink signal; and determining the second downlink synchronization timing according to the first downlink synchronization timing and the synchronization deviation information.
  • the UE may receive synchronization deviation information from the network side (the first network device or the second network device or the central control node), and the UE determines the second downlink synchronization timing according to the first downlink synchronization timing and the synchronization deviation information.
  • the network side device sends the first downlink synchronization timing t1 and the second downlink synchronization timing t2 deviation information (for example, t2-tl) to the UE, and the UE determines the first downlink synchronization tl according to the method in the prior art, and then according to the method.
  • the deviation information determines the second downlink synchronization t2.
  • the first network side device can learn the time when the signal sent by the UE is received by detecting the uplink signal sent by the UE, and the second network side device can learn the time of receiving the signal sent by the UE by detecting the uplink signal sent by the UE.
  • the first network side device and the second network side device may share the time when they each receive the signal sent by the UE, so that the time deviation information of the uplink signal can be calculated.
  • the downlink synchronization deviation information is determined according to the received time deviation information of the acquired uplink signal, for example, the first network side device and the second network side device are simultaneously configured.
  • the reception time deviation of the uplink signal is equal to the deviation of the downlink synchronization.
  • the first network side device, the second network side device, and the central control node may share the reception time of the uplink signal to calculate the downlink synchronization deviation information.
  • the first downlink signal is control signaling and the second downlink signal is user data.
  • the first downlink signal is used for transmission control signaling
  • the second downlink signal is used for transmission.
  • User data is, for example, a PDCCH in an LTE system, such as a PDSCH in an LTE system.
  • the UE may receive control signaling sent by one network side device and receive user data sent by other network side devices.
  • the UE may receive the inter-symbol interference.
  • the performance of a certain signal is poor. Therefore, if the method of the embodiment of the present invention is used, the UE can receive the performance of the two signals when the UE receives the control signaling and the user data by using the downlink synchronization corresponding to the different network side devices.
  • the first downlink signal is control signaling
  • the second downlink signal is a reference signal used for measurement.
  • the first downlink signal is used for transmission control signaling
  • the second downlink signal is used for transmission of reference signals for measurement purposes.
  • the network side device generally needs to obtain the downlink CSI and perform feedback by measuring the downlink reference signal sent by the network side device before the scheduling UE receives the user data, so as to perform accurate scheduling according to the channel condition. Therefore, before the second network side device sends the user data to the UE, the downlink reference signal (for example, the CSI-RS in the LTE system) needs to be sent to the UE, so that the UE can measure the downlink channel corresponding to the second network side device.
  • the second downlink signal may also be a downlink reference signal for UE measurement.
  • the first downlink signal and the second downlink signal are different reference signals for measurement, respectively.
  • the first downlink signal and the second downlink signal are respectively used to transmit reference signals for different measurement purposes.
  • the UE before transmitting the first downlink signal, the UE also needs to obtain the downlink CSI and feedback by measuring the downlink reference signal sent by the network side device, so as to perform accurate scheduling according to the channel condition. Therefore, the first downlink signal may also be Downlink reference signal for UE measurement.
  • the first downlink signal is a reference signal used for demodulating the control signaling
  • the second downlink signal is a reference signal used for demodulating user data.
  • the first downlink signal may be a reference signal used for demodulation control signaling
  • second The downlink signal may be a reference signal for demodulating user data.
  • the network side device sends control signaling or user data to the UE, and usually sends a reference signal at the same time, so that the UE can perform channel estimation according to the corresponding reference signal, and then the control signaling or user data can be demodulated.
  • the network side device when the network side device sends the control signaling to the UE, the CRS is also sent, and the user data is sent to the UE, and the Demodulation Reference Signal (DM RS) is also sent;
  • DM RS Demodulation Reference Signal
  • the channel conditions experienced are the same as control signaling or user data, and these reference signals also require the same downlink synchronization as control signaling or user data.
  • the first downlink signal and the second downlink signal are transmitted at different times, or the first downlink signal and the second downlink signal are transmitted on different subcarriers.
  • the first downlink signal and the second downlink signal are transmitted in a time division multiplex or a frequency division multiplex manner, and the embodiment according to the present invention is not limited thereto, for example, the first according to an embodiment of the present invention.
  • the downlink signal and the second downlink signal may also be transmitted in a code division multiplexing manner.
  • the first downlink signal and the second downlink signal are transmitted at different times/frequency.
  • these network side devices do not transmit signals or reduce the power of the signals at the time/frequency at which the other party transmits signals, which can further reduce mutual interference.
  • the overlap of the first down signal and the second down signal is avoided, thereby avoiding interference between them.
  • different downlink synchronizations can be used for them to obtain the benefit of avoiding inter-symbol interference between the two signals.
  • the TTI in a case where the first downlink signal and the second downlink signal are transmitted at different times, the TTI includes a symbol for transmitting control signaling and a symbol for transmitting user data, the first The line signal is control signaling, and the second downlink signal is user data.
  • the sum of the length of the first downlink signal and the length of the second downlink signal is less than the length of the transmission time interval.
  • the length of the TTI is less than one TTI, so as to prevent the control signaling sent by the first network side device from overlapping with the data signal sent by the second network side device, thereby preventing the two from interfering with each other.
  • the first downlink signal sent by the first symbol of the symbol for transmitting control signaling may be received according to the first downlink synchronization timing, where the ⁇ is smaller than the number of symbols used for transmitting control signaling .
  • the network side device transmits control signaling to the UE only on a part of the symbols of one of the control signaling areas.
  • the UE only receives signals of a part of the symbols of the control signaling area, and the ⁇ symbols are the first symbols of the control signaling area.
  • a second downlink signal sent by the last symbol of the symbol for transmitting user data may be received according to the second downlink synchronization timing, where the ⁇ is smaller than the number of symbols used for transmitting user data.
  • the network side device transmits user data to the UE only on a part of the symbol of a user data area of the UI.
  • the UE receives only a portion of the symbols of the data region, and the symbols are the last symbols of the data region.
  • the method of FIG. 1 further includes: receiving, from the network side, synchronization indication information, where the synchronization indication information is used to indicate determining the second downlink synchronization timing, and receiving the second downlink according to the second downlink synchronization timing.
  • the signal, wherein in 210, the second downlink synchronization timing may be determined after receiving the synchronization indication information.
  • the network side device sends multiple synchronization receiving signaling to the UE, and after receiving the UE, the first downlink signal and the second downlink signal are received according to different downlink synchronizations.
  • the present invention is directed to a UE to which CoMP technology is applied, and only a part of UEs in a network apply CoMP technology, the UE does not know whether it is necessary to use the present invention to receive a downlink signal, and therefore, the network side device sends signaling to the UE.
  • the UE that needs to use the UE is configured to receive the first downlink signal by using the first downlink synchronization, and the second downlink signal is used to receive the second downlink signal, so that the UE can cooperate with the network side device.
  • FIG. 3 is a schematic flowchart of a communication method according to an embodiment of the present invention.
  • the method of Figure 3 Executed by the network side device.
  • the method of FIG. 3 corresponds to the method of FIG. 2 and will not be described herein.
  • the control node controls the first network side device and the second network side device to send a detection signal to the user equipment UE, where the detection signal is used by the UE to determine a first downlink synchronization timing according to the detection signal and determine a second downlink synchronization timing.
  • the control node controls the first network side device to send the first downlink signal to the UE, and controls the second network side device to send the second downlink signal to the UE.
  • the detection signal may be a downlink synchronization signal for determining the downlink synchronization timing of the downlink signal.
  • the first network side device and the second network side device transmit the first downlink signal and the second downlink signal on the same carrier.
  • control node is configured to enable the first network side device and the second network side device to cooperate to provide services for the UE, and the control node may further be configured to schedule resources of the first network side device and/or the second network side device, so that The UEs served by the first network side device and/or the second network side device are all allocated sufficient resources to communicate, and are also capable of controlling processes such as handover of the UE between the first network side device and the second network side device.
  • the first network side device and the second network side device may be configured to send a detection signal to the UE, so that the UE receives downlink signals from different network side devices according to different downlink synchronization timings, to avoid symbols received by the signals. Inter-interference, thereby improving the transmission efficiency of the downlink signal.
  • the control node controls the first network side device to send a first detection signal to the UE; the control node controls the second network side device to send a second detection signal to the UE.
  • the method of FIG. 3 further includes: the control node controls the second network side device to send information corresponding to the second detection signal to the UE, or the control node sends the second detection to the UE The information corresponding to the signal, so that the UE receives the second detection signal according to the information corresponding to the second detection signal.
  • the control node controls the first network side device to send a first detection signal to the UE
  • the first downlink synchronization timing of the downlink signal sent by the first network side device to the UE and the downlink sent by the second network side device to the UE are determined by the control node according to the first detection signal.
  • the second downlink transmission time of the signal determines synchronization deviation information, where the synchronization deviation information is a difference between the first downlink transmission time and the second downlink transmission time
  • the method of FIG. 3 further includes: the control node sends a synchronization deviation to the UE Information, so that the UE determines the second downlink synchronization timing according to the first downlink synchronization timing and the synchronization deviation information.
  • the first downlink signal is control signaling and the second downlink signal is user data.
  • the first downlink signal is the control signaling
  • the second downlink signal is a reference signal used for measurement.
  • the first downlink signal and the second downlink signal are different reference signals for measurement, respectively.
  • the first downlink signal is a reference signal used for demodulating the control signaling
  • the second downlink signal is a reference signal used for demodulating user data.
  • the first downlink signal and the second downlink signal are transmitted at different times, or the first downlink signal and the second downlink signal are transmitted on different subcarriers.
  • the transmission time interval includes a symbol for transmitting control signaling and a symbol for transmitting user data
  • the downlink signal is control signaling
  • the second downlink signal is user data.
  • the sum of the length of the first downlink signal and the length of the second downlink signal is less than the length of the transmission time interval.
  • the control node controls the first network side device to send a first downlink signal to the UE by using the first N symbols of the symbol for transmitting control signaling, where the N is smaller than the signal used for transmission control signaling. The number of symbols.
  • control node controls the second network side device to transmit the user data by using the The last M symbols of the symbol transmit a second downlink signal to the UE, wherein the M is less than the number of symbols used to transmit user data.
  • the method of FIG. 3 further includes: the control node sending synchronization indication information to the UE, indicating to determine the second downlink synchronization timing, and receiving the second downlink signal according to the second downlink synchronization timing.
  • control node is a central control node independent of the first network device and the second network device; or the control node is a first network side device or a second network device.
  • FIG. 4A is a schematic diagram of mapping of reference signals in a physical resource block.
  • 4B is a schematic diagram of time division multiplexing of a Physical Downlink Shared Channel (PDSCH) and a Physical Downlink Control Channel (PDCCH).
  • 4C is a schematic diagram of PDSCH and PDCCH frequency division multiplexing.
  • FIG. 5A is a schematic diagram of downlink signals transmitted by different network side devices.
  • Figure 5B is a schematic diagram of different network side devices transmitting downlink signals in accordance with an embodiment of the present invention.
  • 6 is a schematic flow chart of a communication process in accordance with an embodiment of the present invention.
  • Fig. 6 is an example of Figs. 2 and 3.
  • the network side device that transmits the control signaling to the UE may be a fixed network side device, so that the UE only needs to detect the control signaling sent by one network side device, thereby reducing the complexity of the UE detection.
  • the network side device that transmits user data to the UE may dynamically change.
  • the first network side device may send data to the UE in the first TTI
  • the second network side device may send data to the UE in the second TTI, such that
  • the most suitable network side device can be dynamically selected according to the channel status and service status of the network side device to send user data, that is, Dynamic Point Selection (DSP), to improve the transmission efficiency.
  • DSP Dynamic Point Selection
  • the control signaling may include: information transmitted by the PDCCH in the LTE system (for example, for scheduling the UE to send uplink or receive downlink signals), or feedback information transmitted through the PHICH (for example, "Is the network side device correct?
  • the information of the PUSCH previously transmitted by the code "notifies the UE, so that the UE can decide whether to retransmit the PUSCH according to the information."
  • the user data may include: information transmitted through the PDSCH.
  • the first downlink signal is used as control signaling (for example, PDCCH)
  • the second downlink signal is user data (for example, PDSCH)
  • the foregoing detection signal ie, downlink synchronization signal
  • CRS channel synchronization signal
  • the central control node may cooperate with the first network side device to cooperate with the first network side device and the second network device to provide services to the UE.
  • the central control node may be a base station
  • the first network side device may be a remote wireless device or an access point.
  • the base station uniformly controls the remote wireless device (and other wireless devices) to transmit or receive, specifically, A UE that communicates with the remote wireless device to schedule resources, determine signaling sent by the remote wireless device to the UE, generate a baseband or radio frequency signal sent by the remote wireless device, and process a signal received by the remote wireless device from the UE
  • the remote wireless device only has the function of transmitting and receiving signals, and specifically includes acquiring signaling from the base station and transmitting the signal to the UE, acquiring the baseband from the base station, and converting the signal into a radio frequency signal, and then transmitting the signal to the UE (or acquiring the radio frequency signal from the base station).
  • the first network side device and the second network side device may share information (e.g., channel state information, scheduling information, data information, etc.) through the central control node.
  • information e.g., channel state information, scheduling information, data information, etc.
  • the central control node may cooperate with the second network side device to cooperate with the first network side device and the second network side device to provide services to the UE.
  • the second network side device may be a remote wireless device or an access point or the like.
  • the first network side device and the second network side device may share information (e.g., channel state information, scheduling information, data information, etc.) through the central control node.
  • the central control node may send synchronization indication information to the UE.
  • the synchronization indication information is used to indicate that the UE determines different downlink synchronization timings for different downlink signals and receives different downlink signals according to different downlink synchronization timings.
  • the synchronization indication information may be a flag bit, and the value of the flag bit. 1 indicates that the UE is based on the second downlink Step timing to receive the second downlink signal. A value of 0 for this flag indicates that the UE uses the conventional method for downlink synchronization.
  • the synchronization indication information may be a dedicated signaling message or may be carried by an existing signaling message.
  • the embodiment of the present invention is directed to a UE to which CoMP technology is applied, if only a part of UEs in a network apply CoMP technology, the UE does not know whether it is necessary to use the embodiment of the present invention to receive a downlink signal. Therefore, the network side device Signaling (eg, signaling including synchronization indication information) may be sent to the UE to notify the UE that needs to use the embodiment of the present invention to receive the first downlink signal according to the first downlink synchronization timing, and receive according to the second downlink synchronization timing. The second downlink signal is used, so that the UE cooperates with the network side device.
  • Signaling eg, signaling including synchronization indication information
  • the synchronization indication information may also be sent by the first network side device or the second network side device to the UE.
  • 620 is optional.
  • 620 may be omitted when all UEs in the network are UEs that may use CoMP technology.
  • the first network side device may send the first downlink synchronization signal to the UE.
  • the first downlink synchronization signal may be a detection sequence, such as CRS or CSI-RS.
  • Figure 4A shows the time-frequency grid points (also called an RE) corresponding to these signals, where the configuration of the CRS can be notified to all UEs by broadcast, CRS exists in every TTI, and occupies the entire system bandwidth (ie Figure 4B and All physical resource blocks (PRBs) shown in Figure 4C. Due to the high density of CRS, obtaining downlink synchronization through CRS can achieve better accuracy.
  • the configuration of the CSI-RS is to notify a single UE in a unicast manner, not in every TTI; to obtain downlink synchronization through the CSI-RS, it can be flexibly selected as a certain UE (for example, by multiple network side devices)
  • the UE of the joint service sends different network side devices of the CSI-RS, so that a certain UE performs downlink synchronization with different network side devices accordingly.
  • a CRS or CSI-RS dedicated to downlink synchronization may be transmitted or received at a certain time-frequency point of a certain TTI on the network side or the UE side.
  • the network side device may send, to the UE, a time-frequency grid point signal that detects a sequence modulated signal.
  • the UE may confirm the signal modulated by the detection sequence sent by the cell according to the received time-frequency grid point information, and acquire the first downlink synchronization by detecting the signal modulated by the detection sequence.
  • the network side device may further send, to the UE, a cell identifier (ID) corresponding to the first network side device, so that the UE may confirm, according to the cell ID corresponding to the first network side device, a signal modulated by the detection sequence sent by the cell, and The first downlink synchronization is obtained by detecting the signal.
  • ID cell identifier
  • the UE may determine, according to the first downlink synchronization signal, a first downlink synchronization timing.
  • the UE when receiving the first downlink synchronization signal (for example, using the CRS in the form of a detection sequence), the UE may perform a convolution operation on the CRS sequence locally acquired by the UE and the received CRS, and obtain the convolution operation.
  • the time corresponding to the value exceeding the threshold first is the time at which the first downlink synchronization signal is received, and the first downlink synchronization timing is determined accordingly.
  • the first downlink synchronization timing may be determined by other conventional methods for determining downlink synchronization, and details are not described herein.
  • the UE may receive the first downlink signal according to the first downlink synchronization timing.
  • the first downlink synchronization timing may be determined according to a certain CRS on the first symbol of FIG. 4B, and the PDCCH transmitted on the second symbol is received according to the first downlink synchronization timing.
  • the first downlink synchronization timing may be determined according to a certain CRS of the PDCCH region on the first symbol, and the PDCCH transmitted on the other symbol is received according to the first downlink synchronization timing.
  • the second network side device may send a second downlink synchronization signal to the UE.
  • the second downlink synchronization signal may be a CRS or a CSI-RS.
  • 660 is similar to 530 and will not be described here.
  • a CRS or CSI-RS dedicated to downlink synchronization may be transmitted or received at a certain time-frequency point of a certain TTI on the network side or the UE side.
  • the second network side device sends the time-frequency grid point information of the signal for detecting the sequence modulation to the UE, and the UE may confirm the signal modulated by the detection sequence sent by the cell according to the received time-frequency grid point information, and detect the The sequence modulated signal is detected to obtain a second downlink synchronization.
  • the second network side device may further send the cell ID corresponding to the second network side device to the UE, so that the UE may confirm the signal modulated by the detection sequence sent by the cell according to the cell ID corresponding to the second network side device, and A second downlink synchronization is obtained by detecting a signal modulated by the detection sequence.
  • the UE may determine a second downlink synchronization timing according to the second downlink synchronization signal.
  • the UE when receiving the second downlink synchronization signal (for example, using the CRS in the form of a detection sequence), the UE may perform a convolution operation on the CRS sequence locally acquired by the UE and the received CRS, and obtain the convolution operation. The time corresponding to the value exceeding the threshold first in the result is taken as the time at which the second downlink synchronization signal is received, and the second downlink synchronization timing is determined accordingly.
  • the UE may receive the second downlink signal according to the second downlink synchronization timing.
  • the second downlink signal is a PDSCH signal, which is transmitted on symbols other than the PDCCH.
  • the PDSCH and the PDCCH are transmitted in a time division multiplex manner.
  • the second downlink synchronization timing may be determined according to a certain CRS on the symbol numbered 4 of FIG. 4B, and the PDSCH 0 transmitted on the symbol of the PDSCH region is received according to the second downlink synchronization timing.
  • the second downlink signal is a PDSCH signal, which is transmitted on other PRBs except the PDCCH.
  • the PDSCH and the PDCCH are transmitted in a frequency division multiplexed manner.
  • the second downlink synchronization timing may be determined according to a CRS of the PDSCH region on the first symbol, and the PDSCH transmitted on other symbols may be received according to the second downlink synchronization timing.
  • the network side device 1 is in front. 2 symbols send control signaling to the UE, and the network side device 2 sends the next 12 symbols to the UE. Controlling the signaling, if the distance between the network side device 1 and the UE is greater than the distance between the network side device 2 and the UE, the time when the UE receives the signal of the network side device 1 is later than the time when the signal of the network side device 2 is received. The control signaling transmitted by the network side device 1 on the second symbol overlaps with the data signal transmitted by the network side device 2 on the third symbol, so that the two interfere with each other.
  • the network side device 2 can be made to reduce the number of symbols for transmitting the data signal, as shown in FIG. 5B, that is, the network side device 2 does not send a signal to the UE on the third symbol (specifically, at the symbol In the case, no signal is transmitted on the PRB allocated to the UE, or the transmission power is 0), thus avoiding overlap.
  • the network side device 1 can also reduce the number of symbols for sending control signaling, and details are not described herein again.
  • the characteristics of each symbol included in one TTI are different. For example, as shown in FIG. 4A, the CRS appears on the symbols numbered 0, 4, 7, and 11, and the CRS is not included in other symbols.
  • the UE receives the downlink various signals according to the format, for example, receiving the PDCCH according to the format of the first two symbols (for example, in the PDCCH domain)
  • the CRS is received on the first symbol
  • the PDSCH is received in the format of the last 14-2 symbols (for example, the CRS is received on the third symbol of the PDSCH field).
  • the PDCCH received by the UE is from the first network side device, and the first two symbols corresponding to one TTI should be received according to the format of the first two symbols (for example, the first symbol in the PDCCH field).
  • Receive CRS on which is the same as the prior art).
  • the PDSCH received by the UE is from the second network side device, corresponding to the next 14-1-2 symbols of one TTI (for example, receiving the CRS on the second symbol of the PDSCH field), and should be in the format of the last 11 symbols. receive.
  • FIG. 7 is a schematic flow chart of a communication process according to another embodiment of the present invention.
  • Fig. 7 is an example of Figs. 2 and 3. 730, 740, 750, and 780 of FIG. 7 are the same as 630, 640, 650, and 680 of FIG. 6, and are not described herein again.
  • the first network side device may cooperate with the second network side device to provide a service to the UE in conjunction with the second network side device.
  • the first network side device can function as a control node.
  • Information e.g., channel state information, scheduling information, data information, etc.
  • Information may be shared between the first network side device and the second network side device.
  • the first network side device may send synchronization indication information to the UE. Similar to the 620 of Figure 6, and will be described here.
  • the first network side device may send the first downlink synchronization signal to the UE.
  • the UE may determine, according to the first downlink synchronization signal, a first downlink synchronization timing.
  • the UE may receive the first downlink signal according to the first downlink synchronization timing.
  • the first network side device sends synchronization deviation information to the UE.
  • the first network side device can learn the time when the signal sent by the UE is received by detecting the uplink signal sent by the UE, and the second network side device can learn the time of receiving the signal sent by the UE by detecting the uplink signal sent by the UE.
  • the first network side device and the second network side device may share the time when they each receive the signal sent by the UE, so that the time deviation information of the uplink signal can be calculated.
  • the receiving time deviation of the uplink signal is equal to the deviation of the downlink synchronization.
  • the first network side device and the second network side device may share the reception time of the uplink signal to calculate downlink synchronization deviation information.
  • the UE may determine the second downlink synchronization timing according to the first downlink synchronization timing and the synchronization deviation signal.
  • the UE determines the first downlink synchronization timing t1 according to the method of the prior art, and determines the second downlink synchronization timing t2 based on the synchronization deviation information.
  • the UE may receive the second downlink signal according to the second downlink synchronization timing.
  • the communication method according to the embodiment of the present invention has been described above, and the user equipment and the network side device according to the embodiment of the present invention are described below with reference to FIGS. 8 and 9, respectively.
  • FIG. 8 is a structural schematic diagram of a user equipment 800 in accordance with another embodiment of the present invention.
  • User device 800 includes: a determination module 810 and a receiving module 820.
  • the determining module 810 determines a first downlink synchronization timing based on the detection signal received from the network side and determines a second downlink synchronization timing.
  • the receiving module 820 receives the first downlink signal according to the first downlink synchronization timing, and receives the second downlink signal according to the second downlink synchronization timing.
  • the UE can receive different downlink signals according to different downlink synchronization timings to avoid inter-symbol interference received by the signals, thereby improving the transmission efficiency of the downlink signals.
  • the determining module 810 determines a first downlink synchronization timing according to the received first detection signal, and determines a second downlink synchronization timing according to the received second detection signal.
  • the receiving module 820 also receives information corresponding to the second detection signal, receives the second detection signal according to the information corresponding to the second detection signal, and determines the second downlink synchronization timing according to the second detection signal.
  • the receiving module 810 further determines a first downlink synchronization timing according to the received first detection signal, and receives synchronization deviation information from the network side, where the synchronization deviation information indicates a downlink transmission time and a second downlink signal of the first downlink signal.
  • the determining module performs a second downlink synchronization timing according to the first downlink synchronization timing and the synchronization deviation information.
  • the first downlink signal is control signaling and the second downlink signal is user data.
  • the first downlink signal is the control signaling
  • the second downlink signal is a reference signal used for measurement
  • the first downlink signal and the second downlink signal are different reference signals for measurement, respectively.
  • the first downlink signal is a parameter used to demodulate the control signaling.
  • the test signal, the second downlink signal is a reference signal for demodulating user data.
  • the first downlink signal and the second downlink signal are transmitted at different times, or the first downlink signal and the second downlink signal are transmitted on different subcarriers.
  • the transmission time interval includes a symbol for transmitting control signaling and a symbol for transmitting user data
  • the downlink signal is control signaling
  • the second downlink signal is user data.
  • the sum of the length of the first downlink signal and the length of the second downlink signal is less than the length of the transmission time interval.
  • the receiving module 820 receives the first downlink signal sent by the first N symbols of the symbol for transmitting control signaling according to the first downlink synchronization timing, where the N is smaller than the transmission control The number of symbols for signaling.
  • the receiving module 820 receives the second downlink signal sent by the last M symbols of the symbol for transmitting the user data according to the second downlink synchronization timing, where the M is smaller than the symbol for transmitting the user data. number.
  • the receiving module 820 further receives the synchronization indication information from the network side, where the synchronization indication information is used to indicate that the second downlink synchronization timing is determined, and the second downlink signal is received according to the second downlink synchronization timing, where the determining module receives the synchronization indication information. Thereafter, the second downlink synchronization timing is determined.
  • FIG. 9 is a structural schematic diagram of a network side device 900 according to another embodiment of the present invention.
  • the network side device 900 includes: a first control module 910 and a second control module 920.
  • the first control module 910 controls the first network side device and the second network side device to send a detection signal to the user equipment UE, where the detection signal is used by the UE to determine the first downlink synchronization timing according to the detection signal and determine the second downlink synchronization timing.
  • the second control module 920 controls the first network side device to send the first downlink signal to the UE, and controls the second network side device to send the second downlink message to the UE. a downlink signal, wherein the first downlink signal and the second downlink signal are transmitted on the same carrier.
  • the first network side device and the second network side device may be controlled according to an embodiment of the present invention.
  • the UE sends the detection signal, so that the UE receives the downlink signals from different network side devices according to different downlink synchronization timings, so that the inter-symbol interference received by the signals can be avoided, thereby improving the transmission efficiency of the CoMP technology.
  • the first control module controls the first network side device to send the first detection signal to the UE, and controls the second network side device to send the second detection signal to the UE.
  • the first control module is further configured to control, by the second network side device, information corresponding to the second detection signal to be sent to the UE or to send, to the UE, a second detection signal. Information, so that the UE receives the second detection signal according to the information corresponding to the second detection signal.
  • the first control module controls the first network side device to send the first detection signal to the UE, so that the UE determines the first downlink synchronization timing according to the first detection signal; Synchronizing deviation information is determined by a first downlink transmission time of a downlink signal sent by the network side device to the UE and a second downlink transmission time of the downlink signal sent by the second network side device to the UE, where the synchronization deviation information is first
  • the network side device 900 further includes a sending module 930. The difference between the downlink transmission time and the second downlink transmission time.
  • the sending module 930 sends synchronization deviation information to the UE, so that the UE determines the second downlink synchronization timing according to the first downlink synchronization timing and the synchronization deviation information.
  • the first downlink signal is control signaling and the second downlink signal is user data.
  • the first downlink signal is the control signaling
  • the second downlink signal is a reference signal used for measurement.
  • the first downlink signal and the second downlink signal are different reference signals for measurement, respectively.
  • the first downlink signal is a parameter used to demodulate the control signaling.
  • the test signal, the second downlink signal is a reference signal for demodulating user data.
  • the first downlink signal and the second downlink signal are transmitted at different times of the same carrier, or the first downlink signal and the second downlink signal are different in the same carrier. Transmission on subcarriers.
  • the transmission time interval includes a symbol for transmitting control signaling and a symbol for transmitting user data
  • the downlink signal is control signaling
  • the second downlink signal is user data.
  • the sum of the length of the first downlink signal and the length of the second downlink signal is less than the length of the transmission time interval.
  • the second control module controls the first network side device to send the first downlink signal to the UE by using the first N symbols of the symbol for transmitting control signaling, where the N is smaller than the The number of symbols that control signaling.
  • the second control module controls the second network side device to send the second downlink signal to the UE by using the last M symbols of the symbol for transmitting the user data, where the M is smaller than the The number of symbols that transmit user data.
  • the network side device 900 further includes a sending module 930.
  • the sending module 930 sends synchronization indication information to the UE, where it is used to indicate that the second downlink synchronization timing is determined and the second downlink signal is received according to the second downlink synchronization timing.
  • the network side device is a central control node independent of the first network device and the second network device; or the network side device is the first network side device or the second network device.
  • the embodiment of the present invention further provides that the communication system may include the user equipment and the network side device described in the foregoing embodiments.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention may be embodied in the form of a software product in the form of a software product, or a part of the technical solution, which is stored in a storage medium, including a plurality of instructions. All or part of the steps of the method of the various embodiments of the present invention are performed by a computer device (which may be a personal computer, server, or network device, etc.).
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM, a random access memory), a magnetic disk or an optical disk, and the like.
  • the medium of the code includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM, a random access memory), a magnetic disk or an optical disk, and the like.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Les modes de réalisation de la présente invention concernent un procédé de communication, un équipement d'utilisateur et un dispositif côté réseau. Le procédé de communication consiste à : déterminer une première distribution temporelle de synchronisation de liaison descendante et déterminer une deuxième distribution temporelle de synchronisation de liaison descendante en fonction d'un signal de détection reçu du côté réseau (210); et recevoir un premier signal de liaison descendante selon la première distribution temporelle de synchronisation de liaison descendante, et recevoir un deuxième signal de liaison descendante selon la deuxième distribution temporelle de synchronisation de liaison descendante (220). La solution technique permet à l'UE de recevoir différents signaux de liaison descendante selon différentes distributions temporelles de synchronisation de liaison descendante, ce qui protège les signaux des interférences inter-symboles et améliore l'efficacité d'émission des signaux de liaison descendante.
PCT/CN2013/072633 2012-03-14 2013-03-14 Procédé de communication, équipement d'utilisateur et dispositif côté réseau WO2013135185A1 (fr)

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CN103987115A (zh) * 2014-05-30 2014-08-13 哈尔滨海能达科技有限公司 一种同步字位置调整方法、帧同步检测方法及其装置
CN108476429B (zh) * 2016-01-18 2023-03-21 联想创新有限公司（香港) 使用不同子帧类型的uci传输
CN107707279B (zh) 2016-08-09 2021-06-29 华为技术有限公司 一种接收定时的配置方法及通信设备

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CN102047728A (zh) * 2008-04-07 2011-05-04 高通股份有限公司 使用定时偏移和消隐的开销信道传输
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