[go: up one dir, main page]

WO2015042916A1 - Procédé d'envoi d'informations, et procédé de détermination de type de cp - Google Patents

Procédé d'envoi d'informations, et procédé de détermination de type de cp Download PDF

Info

Publication number
WO2015042916A1
WO2015042916A1 PCT/CN2013/084614 CN2013084614W WO2015042916A1 WO 2015042916 A1 WO2015042916 A1 WO 2015042916A1 CN 2013084614 W CN2013084614 W CN 2013084614W WO 2015042916 A1 WO2015042916 A1 WO 2015042916A1
Authority
WO
WIPO (PCT)
Prior art keywords
subframe
communication node
type information
type
ofdm symbol
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2013/084614
Other languages
English (en)
Chinese (zh)
Inventor
李强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN201380001551.3A priority Critical patent/CN104685848A/zh
Priority to PCT/CN2013/084614 priority patent/WO2015042916A1/fr
Publication of WO2015042916A1 publication Critical patent/WO2015042916A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • 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
    • H04L27/2666—Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length

Definitions

  • the present application relates to the field of wireless communication technologies, and in particular, to a method for transmitting information and a method for determining a type of a CP. Background technique
  • the downlink transmission of the LTE (Long Term Evolution) system is divided into sub-frames in time, and each sub-frame has a length of 1 ms (milliseconds).
  • Each sub-frame is further divided into two slots (slots), each slot having a length of 0.5 ms.
  • Each slot is further divided into 6 or 7 OFDM (Orthogonal Frequency Division Multi-Access) symbols.
  • the downlink transmission of the LTE system is based on the OFDM modulation mode, and the downlink transmission data of the LTE system is first converted into an OFDM signal and then transmitted.
  • the data to be transmitted is first mapped to each subcarrier, and then the signal is converted from the frequency domain to the time domain by IFFT (Inverse Fast Fourier Transform).
  • IFFT Inverse Fast Fourier Transform
  • the last part of the time domain signal is then copied to the front end of the time domain signal.
  • the signal copied in this part is called CP (Cyclic Prefix).
  • the primary role of the CP is to combat OFDM intersymbol interference problems in multipath channel transmissions in wireless communication systems.
  • normal CP normal CP
  • extended CP extended CP
  • the CP In the existing LTE system, usually one cell only uses one of the CP types, and all subframes except the MBMS (Multimedia Broadcast Broadcast Service) are used in this type of subframe.
  • the CP generates an OFDM symbol. For example: If a cell chooses to use a normal CP, all subframes of this cell use ordinary CPs.
  • the UE User Equipment
  • the synchronization signal in the (Synchronization Channel) is used to know the type of CP used by the current cell.
  • the downlink transmission of the LTE system in the prior art may have at least the following technical problems:
  • the network side device needs to notify the UE of the type of the CP in the downlink subframe in time.
  • the high-level signaling and the synchronization signal sent by the network-side device are relatively slow. Therefore, there is a technical problem that the network side device cannot notify the UE in time which subframes are normal CPs, and which subframes are carried.
  • the UE cannot determine the type of the CP carried in each downlink subframe in time, and the UE does not send and demodulate the data in the downlink subframe based on the correct CP type.
  • the network side device actually transmits the extended CP, and the UE demodulation is demodulated according to the ordinary CP, and the data cannot be correctly received.
  • the network side device actually transmits the normal CP, and the UE demodulation is demodulated according to the extended CP, and the data cannot be correctly received.
  • the embodiment of the present application solves the problem that the network side device cannot be notified in time when the common CP and the extended CP are mixed in the LTE system in the prior art by providing a method for transmitting information and a method for determining the type of the CP.
  • the embodiment of the present application provides a method for transmitting information, where the method includes: determining, by a first communication node, cyclic prefix CP type information, where the CP type information indicates a CP in a corresponding first subframe type;
  • the first communication node sends the CP type information to the second communication node by using the first subframe, so that the second communication node can determine the CP in the first subframe according to the CP type information. type.
  • the sending, by the first communications node, the CP type information to the second communications node by using the first subframe includes:
  • the first communication node places the CP type information in a first orthogonal frequency division multiple access OFDM symbol and/or a last OFDM symbol of a specific time slot in the first subframe;
  • the first communication node transmits the CP type information by the first OFDM symbol and/or the last OFDM symbol.
  • the transmitting, by the first communications node, to the second communications node by using the first subframe Before the CP type information further includes:
  • the first communication node adds a CP of the same type as the CP type information to the OFDM symbol carrying the CP type information.
  • the specific time slot is the foregoing The first time slot in a subframe.
  • the first subframe includes a subframe that carries the CP type information.
  • the first subframe further includes N subframes after the subframe that carries the CP type information, where N is a positive integer.
  • the first communications node sends the CP to the second communications node by using the first subframe Type information, including:
  • the first communication node sends the CP type information to the second communication node by consecutive M subcarriers or discontinuous M subcarriers in the first subframe, where M is a positive integer.
  • the sending, by the first communications node, the CP type information to the second communications node by using the first subframe includes:
  • the first communication node transmits the CP type information together with the demodulation reference signal to the second communication node through the first subframe.
  • the method further includes:
  • the first communication node transmits other channel information using resources other than the resource transmitting the CP type information.
  • the method further includes:
  • the first communication node notifies the second communication node by using a high layer signaling or a synchronization signal to the type of the CP in the second subframe that does not correspond to the CP type information within the preset duration, so that the second communication node Determining the type of the CP in the second subframe.
  • the embodiment of the present application provides a method for determining a CP type, where the method includes: receiving, by a second communications node, CP type information from a first communications node, where the CP type information is by the first
  • the communication node transmits the first subframe and corresponds to the first subframe.
  • the second communication node determines the type of the CP in the first subframe according to the CP type information.
  • the second communications node receives the CP type information from the first communications node, including:
  • the second communication node receives the CP type information through a first OFDM symbol and/or a last OFDM symbol of a particular time slot in the first subframe.
  • the second communications node passes the first OFDM of the specific time slot in the first subframe
  • the symbol and/or the last OFDM symbol receives the CP type information, including:
  • the second communication node demodulates the first OFDM symbol by using a normal CP, obtaining a CP type information
  • the second communication node demodulates the last OFDM symbol by using a normal CP or an extended CP, to obtain The CP type information.
  • the first subframe includes a bearer A subframe in which CP type information is described.
  • the first subframe further includes N subframes after the subframe that carries the CP type information, where N is a positive integer.
  • the method further includes:
  • the embodiment of the present application provides a first communications node, including:
  • a first determining unit configured to determine cyclic prefix CP type information, where the CP type information indicates a type of a CP in the corresponding first subframe;
  • a sending unit configured to receive the CP type information from the first determining unit, and send the CP type information to the second communications node by using the first subframe, so that the second communications node can be configured according to the
  • the CP type information determines the type of the CP in the first subframe.
  • the sending unit includes: a placing module, configured to place the CP type information in a first slot of a specific time slot in the first subframe Orthogonal Frequency Division Multiple Access OFDM symbols and/or the last OFDM symbol;
  • the first communications node further includes:
  • the specific time slot is the foregoing The first time slot in a subframe.
  • the first subframe includes a subframe that carries the CP type information.
  • the first subframe further includes N subframes after the subframe that carries the CP type information, where N is a positive integer.
  • the sending unit further includes:
  • a second sending module configured to send the CP type information to the second communications node by using consecutive M subcarriers or discontinuous M subcarriers in the first subframe, where M is a positive integer.
  • the sending unit further includes:
  • a third sending module configured to send the CP type information together with the demodulation reference signal to the second communication node by using the first subframe.
  • the first communications node further includes:
  • the first communications node further includes:
  • a notification unit configured to notify the second communication node by using a high layer signaling or a synchronization signal to determine the type of the CP in the second subframe that does not correspond to the CP type information in the preset duration, so that the second communication node determines The type of the CP in the second subframe.
  • the embodiment of the present application provides a second communications node, including:
  • a first receiving unit configured to receive CP type information from the first communications node, where the CP type information is sent by the first communications node by using the first subframe, and corresponding to the first subframe;
  • a determining unit configured to acquire the CP type information from the receiving unit, and determine, according to the CP type information, a type of a CP in the first subframe.
  • the first receiving unit includes: a first receiving module, configured to pass a first OFDM symbol of a specific time slot in the first subframe, and/or The last OFDM symbol receives the CP type information.
  • the first receiving module is further configured to:
  • the normal OFDM symbol is used to demodulate the first OFDM symbol to obtain the CP type information;
  • the CP type information is placed in a last OFDM symbol of a specific time slot in the first subframe, and then the last OFDM symbol is demodulated by using a normal CP or an extended CP to obtain the CP type information.
  • the first subframe includes a bearer A subframe in which CP type information is described.
  • the first subframe further includes N subframes after the subframe that carries the CP type information, where N is a positive integer.
  • the second communications node further includes:
  • a second receiving unit configured to receive a type of a CP of the second subframe that does not correspond to the CP type information in the preset duration that is sent by the first communications node by using the high layer signaling or the synchronization signal, so that the second communications node Determining the type of the CP of the second subframe.
  • the embodiment of the present application provides a first communications node, including:
  • a first processor configured to determine cyclic prefix CP type information, where the CP type information indicates a type of a CP in a corresponding first subframe; and the CP is sent to the second communication node by using the first subframe Type information, to enable the second communication node to determine the type of the CP in the first subframe according to the CP type information.
  • the first processor is further configured to: place the CP type information in a first orthogonal of a specific time slot in the first subframe The frequency division multiple access OFDM symbol and/or the last OFDM symbol; the CP type information is transmitted by the first OFDM symbol and/or the last OFDM symbol.
  • the first processor is further configured to:
  • the specific time slot is The first time slot in the first subframe.
  • the first subframe includes a subframe that carries the CP type information.
  • the first subframe further includes N subframes after the subframe that carries the CP type information, where N is a positive integer.
  • the first processor is further configured to:
  • the first processor is further configured to:
  • the CP type information is transmitted to the second communication node together with the demodulation reference signal through the first subframe.
  • the first processor is further configured to:
  • the first processor is further configured to:
  • the embodiment of the present application provides a second communications node, including:
  • a second processor configured to receive CP type information from the first communication node, where
  • the CP type information is sent by the first communication node through the first subframe and corresponding to the first subframe. According to the CP type information, the type of the CP in the first subframe is determined.
  • the second processor is further configured to: pass the first OFDM symbol and/or the last one of the specific time slots in the first subframe
  • the OFDM symbol receives the CP type information.
  • the second processor is further configured to: If the CP type information is placed in the first OFDM symbol of the specific time slot in the first subframe, the normal OFDM symbol is used to demodulate the first OFDM symbol to obtain the CP type information; And the CP type information is placed in a last OFDM symbol of a specific time slot in the first subframe, and then the last OFDM symbol is demodulated by using a normal CP or an extended CP to obtain the CP type information.
  • the first subframe includes a bearer A subframe in which CP type information is described.
  • the first subframe further includes N subframes after the subframe that carries the CP type information, where N is a positive integer.
  • the second processor is further configured to:
  • the method for transmitting information according to the first aspect, the method for determining a CP type provided by the second aspect, the first communication node provided by the third or fifth aspect, the second communication node provided by the fourth aspect or the sixth aspect Before the first communication node sends the first subframe to the second communication node, the first communication node first determines the CP type information corresponding to the first subframe, where the CP type information indicates the CP in the first subframe. The type, the first communication node sends the CP type information to the second communication node, so that the second communication node can determine the type of the CP in the first subframe according to the CP type information.
  • the first communication node may be a network side device, and the second communication node may be a user equipment UE.
  • the user equipment UE in the case that there is a common CP and an extended CP, the user equipment UE cannot know the CP type of the downlink transmission subframe in time.
  • the technical problem of the LTE system is that the UE can determine the type of the CP of the downlink subframe in time based on the CP type information in the case where the common CP and the extended CP are mixed.
  • Embodiment 1 is a flowchart of a method for transmitting information in Embodiment 1 of the present application;
  • step S103 is a detailed flowchart of step S103 in the first embodiment of the present application.
  • 3A is a schematic diagram of a first OFDM symbol of a specific time slot in which a CP type information is placed in a first subframe according to Embodiment 1 of the present application;
  • FIG. 3B is a schematic diagram of the last OFDM symbol of a specific time slot in which the CP type information is placed in the first subframe according to the first embodiment of the present application;
  • FIG. 4A is a schematic diagram of the sub-carriers in which the CP type information occupies consecutively in the first embodiment of the present invention
  • FIG. 4B is a schematic diagram of the sub-carriers in which the CP type information is discontinuous in the first embodiment of the present application
  • FIG. 6 is a flowchart of a method for determining a CP type in Embodiment 2 of the present application.
  • FIG. 7 is a schematic structural diagram of a first communication node in Embodiment 3 of the present application.
  • FIG. 8 is a schematic structural diagram of a second communication node in Embodiment 4 of the present application.
  • FIG. 9 is a schematic structural diagram of a first communication node in Embodiment 5 of the present application.
  • FIG. 10 is a schematic structural diagram of a second communication node in Embodiment 6 of the present application. detailed description
  • the embodiment of the present application provides a method for transmitting information and a method for determining a type of a CP.
  • the network side device cannot notify the user equipment in time.
  • a method of transmitting information comprising:
  • the first communication node determines CP type information, where the CP type information indicates a corresponding first The type of CP in the subframe;
  • the first communication node transmits the CP type information to the second communication node through the first subframe, so that the second communication node can determine the type of the CP in the first subframe according to the CP type information.
  • the embodiment provides a method for transmitting information, which is applied to a first communication node, where the first node may be a network side device, such as a base station.
  • the method for sending information includes:
  • Step S101 The first communication node determines CP type information, where the CP type information indicates a type of the CP in the corresponding first subframe.
  • CP Cyclic Prefix
  • CP includes two types: normal CP (normal CP) and extended CP (extended CP).
  • the CP type information in the embodiment of the present application is used to notify the type of the CP in the first subframe of the second communication node, so that the second communication node can determine the type of the CP in the first subframe, and based on the correct CP type.
  • the data in the first subframe is demodulated and received.
  • step S101 is that the first communication node determines the type of CP in the first subframe to be sent to the second communication node, and obtains CP type information for indicating the CP type of the first subframe.
  • Step S103 The first communication node sends the CP type information to the second communication node by using the first subframe, so that the second communication node can determine the type of the CP in the first subframe according to the CP type information.
  • the first communication node when transmitting the downlink subframe data to the second communication node, the first communication node does not carry the CP type information in the downlink subframe.
  • the first communication node sends the CP type information corresponding to the first subframe to the second communication node by using the first subframe, so that the second communication node can determine the first information according to the CP type information.
  • the type of CP in a sub-frame specifically refers to a network side device (such as a base station), and the second communication node specifically refers to a user equipment.
  • the technical problem that the user equipment UE cannot know the CP type of the downlink transmission subframe in time can be effectively solved in the LTE system in the prior art in the case of the mixed CP and the extended CP.
  • the technical effect of the type of the CP in the first subframe corresponding to the CP type information can be confirmed in time by the user equipment UE based on the received CP type information in the case where the common cell and the extended CP are mixed in the LTE system. .
  • step S103 the method further includes:
  • Step S102 The first communication node adds a CP of the same type as the CP type information to the OFDM symbol carrying the CP type information.
  • the CP added before the CP type information may be the same type of CP as the CP of the first subframe, or may be a different type of CP.
  • a CP of the same type as the CP of the first subframe is added before the CP type information, so that the difficulty of generating data in the first subframe can be reduced.
  • step S103 includes:
  • Step S201 The first communication node places the CP type information in a first OFDM symbol and/or a last OFDM symbol of a specific time slot in the first subframe.
  • Step S202 The first communication node sends the CP type information to the second communication node by using the first OFDM symbol and/or the last OFDM symbol.
  • the first subframe refers to a type of subframe that is used to learn the CP type by using the CP type information, and may be one subframe or multiple subframes.
  • Each subframe in the first subframe includes two slots, that is, a first slot and a second slot.
  • the particular time slot mentioned above may be any one of the two time slots.
  • the second communication node when the CP type information is located in a first OFDM symbol of a specific time slot in the first subframe, whether the CP of the first OFDM symbol is a normal CP or an extended CP, the second communication node is The first OFDM symbol may be received according to a normal CP receiving manner, thereby acquiring CP type information located in the first OFDM symbol.
  • the specific reasons are as follows:
  • FIG. 3A the upper part of FIG. 3A shows a structure of a slot using a normal CP. It can be seen that there are 7 OFDM symbols, respectively: OFDM symbol 11, OFDM symbol 12, OFDM symbol 13, OFDM symbol 14 OFDM symbol 15, OFDM symbol 16, OFDM symbol 17.
  • the lower part of FIG. 3A shows a structure of a slot using the extended CP. It can be seen that there are 6 OFDM symbols, respectively: OFDM symbol 21, OFDM symbol 22, OFDM symbol 23, OFDM symbol 24, OFDM symbol 25 , OFDM symbol 26.
  • the CP type information is placed in the first OFDM symbol, specifically: if the first communication node actually uses a normal CP, the CP type information is placed in the OFDM symbol 11; When the CP is extended, the CP type information is placed in the OFDM symbol 21.
  • Case 1 If the first communication node actually transmits the normal CP, it is normal to use the normal CP to demodulate, and there is no problem.
  • the time point b to the time point d in the OFDM symbol 11 are the CP type information corresponding to the first subframe, and the time point a to the time in the OFDM symbol 11.
  • Point b is the CP in front of the CP type information. It can be seen that when the first communication node actually uses the normal CP, the second communication node receives the OFDM symbol 11 based on the normal CP, and can obtain the complete CP type information of the time point b to the time point d located in the OFDM symbol 11. . Next, the second communication node may determine the CP type of the first subframe based on the CP type information.
  • Case 2 As shown in FIG. 3A, referring specifically to the lower part of FIG. 3A, if the first communication node actually transmits the extended CP, the time point c to the time point e segment in the OFDM symbol 21 carries the first The CP type information corresponding to the subframe, the time point a to the time point c in the OFDM symbol 21, is the CP of the OFDM symbol 21. Then, when the second communication node demodulates the OFDM symbol 21 by the normal CP, the second communication node receives the data of the time point b to the time point d in the OFDM symbol 21, but due to the time in the OFDM symbol 21.
  • Point b to time point c segment data and OFDM symbol The data of the time point d to the time point e segment in the number 21 is the same, and therefore corresponds to the CP corresponding to the first subframe in which the second communication node receives the time point c to the time point e segment located in the OFDM symbol 21.
  • Type information Since the second communication node does not receive data on other OFDM symbols, intersymbol interference is not introduced.
  • the second communication node may determine the CP type of the first subframe based on the CP type information.
  • the CP type information is placed in the last OFDM symbol transmission of a specific time slot in the first subframe, specifically: if the first communication node actually uses a normal CP, the CP type is used. The information is placed in the OFDM symbol 17; if the first communication node actually uses the extended CP, the CP type information is placed in the OFDM symbol 26. In this case, whether the CP type of the last OFDM symbol is a normal CP or an extended CP, the second communication node may receive the last OFDM symbol based on the normal CP or the extended CP, thereby acquiring the last OFDM symbol. CP type information. The specific reasons are as follows:
  • the time point h to the time point i in the OFDM symbol 17 is corresponding to the first subframe.
  • the CP type information, the time point g to the time point h in the OFDM symbol 17, is the CP in front of the CP type information.
  • the time point h to the time point i in the OFDM symbol 26 are corresponding to the first subframe.
  • the CP type information, the time point f to the time point h in the OFDM symbol 26, is the CP in front of the CP type information.
  • the CP type information is always located at the time point h ⁇ time. Point i. Therefore, regardless of which CP type the second communication node uses to receive the last OFDM symbol (specifically, OFDM symbol 17, or OFDM symbol 26), the time point f to the time point h located in the OFDM symbol 26 can be acquired.
  • the second communication node may determine the CP type of the first subframe based on the CP type information.
  • the second communication node can correctly demodulate the CP class after the CP is removed. Type information. Then, the second communication node may perform other OFDM symbol demodulation in the first subframe according to the obtained CP type information.
  • the specific time slot is the first time slot in the subframe in which the CP type information is carried in the first subframe.
  • the specific time slot is selected as the first time slot in the subframe carrying the CP type information in the first subframe
  • the second communication node receives the first one of the first subframes
  • the CP type of the first subframe can be obtained.
  • the CP type of the first subframe can be directly used.
  • the data in the two slots is de-CP, and the data in the second slot is obtained, thereby accelerating the reception of data in the downlink subframe.
  • the specific time slot is selected as the second time slot in the subframe carrying the CP type information in the first subframe
  • the first time slot in the subframe in which the second communication node receives the CP type information is received.
  • the data in the time slot cannot be demodulated, and the CP can be temporarily stored in the first time slot.
  • the data in the first time slot is demodulated. In this way, the reception of data in the downlink subframe is slowed down.
  • the first communication node and the second communication node may determine a communication protocol to determine whether the specific time slot is specifically the first time slot or the second time slot in the subframe carrying the CP type information.
  • the first subframe includes a subframe that carries the CP type information.
  • the first subframe refers to a type of subframe corresponding to the CP type information, and may be one subframe or multiple subframes.
  • the first subframe may be one subframe that carries the CP type information, that is, when the network side transmits the downlink subframe data, each subframe carries a CP type information for indicating its own CP type. In this way, it is possible to prevent signal loss from causing the second communication node to be unable to know the type of the CP of each subframe, and thus it is impossible to demodulate each subframe.
  • the first subframe further includes N subframes after the subframe that carries the CP type information, where N is a positive integer.
  • the first subframe may be a plurality of subframes, where a first subframe of the multiple subframes carries CP type information, where the CP type information is used to indicate the first subframe.
  • the type of CP in the following N subframes For example, the CP type information of one subframe may indicate the CP type of the next five subframes, and may be indicated by 5 bits, and each bit represents a CP type of one subframe, for example, the CP type information is "01101". ( "0" stands for normal CP, "1" stands for extended CP), represents the current sub-frame, and the following 5 sub-frames use CP as normal CP, extended CP, extended CP, normal CP, extended CP . In this way, the utilization efficiency of the CP type information can be improved.
  • step 104 is specifically:
  • the first communication node sends the CP type information to the second communication node by consecutive M subcarriers or discontinuous M subcarriers in the first subframe, where M is a positive integer.
  • the OFDM symbols carrying the CP type information may occupy consecutive M subcarriers, and may also occupy discontinuous M subcarriers.
  • the location of the subcarrier may be defined by the protocol, or may be notified to the second communication node after the configuration of the first communication node. For example, as shown in FIG. 4A, an OFDM symbol carrying CP type information may occupy consecutive subcarriers 30; as shown in FIG. 4B, an OFDM symbol carrying CP type information may also occupy discontinuous subcarriers 40.
  • the first communication node sends the CP type information to the second communication node by using the discontinuous M subcarriers in the first subframe, thus ensuring the reliability of the communication.
  • the rationale is as follows:
  • the CP type information occupies consecutive subcarriers 30, if the channel of the frequency band in which the consecutive subcarriers 30 is located has undergone deep fading, the quality of the downlink data received by the second communication node may be poor. If the CP type information occupies the discontinuous subcarrier 40, the probability that the discontinuous subcarrier 40 is in the same frequency band is relatively low, thereby ensuring the reliability of the communication. For example, as shown in FIG. 4B, the CP type information can occupy 12 subcarriers, and the 12 subcarriers are divided into 3 groups, and the 3 groups are all distributed on the system bandwidth, each group of 4 consecutive subcarriers, and the CP type information. Located on discontinuous subcarrier 40. Because the frequency bands in which the three subcarriers are located have low fading at the same time, the reliability of communication is ensured.
  • step S103 includes:
  • the first communication node demodulates the CP type information by using the first subframe.
  • the reference signal is sent together to the second communication node.
  • the CP type information may be transmitted together with the demodulation reference signal.
  • the second communication node performs channel estimation based on the demodulation reference signal, thereby performing demodulation of the CP type information. In this way, the receiving accuracy of the OFDM symbol in which the CP type information is located can be improved, thereby accelerating the reception of data in the first subframe corresponding to the CP type information by the second communication node.
  • each group is four consecutive subcarriers, and each of the four subcarriers of each group
  • the demodulation reference signal is transmitted by one subcarrier 50 (wherein the demodulation reference signal is used for channel estimation, and the UE can demodulate the downlink subframe only after channel estimation is completed).
  • One subcarrier 50 of each of the four subcarriers carries a reference signal, and each subcarrier 50 is closely spaced from the other three subcarriers, and the channels experienced by each group of four subcarriers are similar, so, from the demodulation reference signal
  • the estimated channel can be used on the other three subcarriers.
  • three subcarriers other than the subcarrier 50 in each group of subcarriers are used to transmit CP type information, so that the demodulation speed of the CP type information can be improved, thereby speeding up the second communication node in the downlink subframe. Reception of data.
  • the method further includes:
  • the first communication node transmits other channel information by using resources other than the resource transmitting the CP type information, that is, other channel information is mapped to resources other than the resources of the CP type information.
  • PDCCH Physical Downlink Control Channel
  • EPDCCH Enhanced PDCCH, Enhanced Downlink Physical Layer Control Channel
  • PDSCH Physical Downlink Shared Channel, downlink physical layer shared channel
  • PMCH Physical Layer Broadcast Channel
  • these channels also occupy subcarriers of different OFDM symbols.
  • the CP type information is introduced, when the resources are mapped, the resources occupied by the CP type information need to be avoided. That is to say, after the CP type resource information uses resources (such as subcarrier resources), other channels no longer send data on these resources. This can avoid mutual interference between CP type information and other channel information.
  • the method further includes:
  • the first communication node notifies the second communication node by higher layer signaling by the type of the CP in the second subframe that does not correspond to the CP type information within the preset duration.
  • the downlink subframe in the LTE system is divided into two types of subframes: a first subframe and a second subframe, where the first subframe is a subframe corresponding to the CP type information, and the second subframe is A subframe that does not correspond to the CP type information.
  • the first subframe (or the second subframe) may be one subframe or multiple subframes.
  • the first communication node may determine the type of the CP in each first subframe based on the CP type information by using the CP type information carried by the first subframe, and then The data in each of the first subframes is demodulated and received.
  • the first communication node may let the second communication node know the type of the CP in the second subframe by using the high layer signaling or the synchronization signal, where all the subframes in the second subframe should have the same type.
  • CP The preset duration is used to indicate the time domain range in which the second subframe is located, and may be 40 ms, or 50 ms, etc., which is not specifically limited in this embodiment.
  • the first communication node may notify the second communication node of the time domain range in which the second subframe is located, for example, in a period of 40 ms, the first communication node may notify the second communication node by using high layer signaling every 40 ms, the 30th The 40 subframes are the second subframe, and the CPs in the 1st to 30th subframes are normal CPs, and the 31st to 40th subframes are the first subframes, and carry CP type information. Then, for the data in the 1-30th subframe, the second communication node may receive by using the normal CP; for the data in the 31-40th subframe, the second communication node needs to determine the CP of the CP through the CP type information.
  • the second communication node learns the type of the CP in the second subframe by using the high layer signaling, and the range in which the second subframe is located, the second communication node can quickly demodulate and receive the second subframe.
  • the receiving rate of the downlink data by the second communication node is increased.
  • the first communication node determines the second subframe according to the following manner:
  • the first communication node determines according to a subframe transmitted by a Multi-media Boradcast Multicast Service (MBMS).
  • MBMS Multi-media Boradcast Multicast Service
  • the broadcast service uses the extended CP due to its transmission characteristics, while other services select whether to use the extended CP according to the cell channel condition. For example, a certain cell determines that the broadcast service uses the extended CP, while other services use the ordinary CP. That
  • the subframe that may be used to transmit the MBMS service is set as the first subframe, and the subframe that is determined not to be used for transmitting the MBMS service may be set as the second subframe.
  • the second subframe it is possible to specify to receive by using a normal CP, and in the first subframe, since it may be a broadcast service subframe or a normal subframe, it needs to be acquired through CP type information.
  • the first communication node determines the amount of users using different CPs in the cell. For example, most users in the community are suitable for transmission with ordinary CPs, while a small number of users need to use extended CP to ensure communication quality. Then the first communication node can determine most of the subframes as the second subframe and determine to transmit with the normal CP. The remaining subframe is the first subframe, and the CP type information needs to indicate which CP the user has used.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the present embodiment provides a method of determining a CP type, which is applied to a second communication node.
  • the second communication node may be a user equipment UE, such as a mobile phone, a tablet, a PDA (Personal Digital Assistant), or an onboard computer.
  • the method for determining the CP type includes:
  • Step S301 The second communication node receives the CP type information from the first communication node, where the CP type information is sent by the first communication node through the first subframe and corresponds to the first subframe.
  • the CP type information is used to indicate the type of the CP in the first subframe, for example, the CP in the first subframe is a normal CP, or the extended CP.
  • Step S302 According to the CP type information, determine the type of the CP in the first subframe.
  • step S301 is specifically:
  • the second communication node receives the CP type information through the first OFDM symbol and/or the last OFDM symbol of the particular time slot in the first subframe.
  • step S301 includes:
  • the second communication node uses the normal CP to demodulate the first OFDM symbol to obtain CP type information
  • the second communication node uses the normal CP or the extended CP to demodulate the last OFDM symbol to obtain the CP class. Type information.
  • the first subframe includes a subframe that carries the CP type information.
  • the first subframe may be a subframe, and the subframe carries the CP type information, where the CP type information is used to indicate the type of the CP of the subframe.
  • the first subframe further includes N subframes after the subframe that carries the CP type information, where N is a positive integer.
  • the first subframe may be a plurality of subframes, where a first subframe of the multiple subframes carries CP type information, where the CP type information is used to indicate the first subframe. And the type of CP in the following N subframes.
  • the method further includes:
  • the second communication node receives the type of the CP of the second subframe that does not correspond to the CP type information within the preset duration that is sent by the first communications node by using the high layer signaling, so that the second communications node determines the CP of the second subframe. Types of.
  • the embodiment of the present application includes two types of subframes, that is, a first subframe and a second subframe.
  • the first subframe corresponds to the CP type information
  • the second communication node can learn the type of the CP in the first subframe by using the CP type information.
  • the second subframe does not communicate with the CP type information, and the second communication node sends the information through the network side.
  • the higher layer signaling learns the type of CP in the second subframe.
  • the first communication node notifies the second communication node to notify within 40 ms by the high layer signaling, and the 30-40th subframe is the first subframe (carrying the CP type information), and the first 30-30 The subframe is the second CP (and the CP type is a normal CP). Then, for the 1st to 30th subframes, the second communication node may determine to receive with the normal CP, and for the 30th to 40th subframes, the second communication node may determine the type of the CP based on the CP type information, and based on the determined The type of CP, which receives the 30-40th subframe.
  • the second communication node learns the type of the CP in the second subframe by using the high layer signaling, and the range in which the second subframe is located, the second communication node can quickly demodulate and receive the second subframe.
  • the receiving rate of the downlink data by the second communication node is increased.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the embodiment provides a first communication node, and the first communication node
  • the point can be a network side device, such as: a base station.
  • the first communication node includes: a first determining unit 601, configured to determine cyclic prefix CP type information, where the CP type information indicates a type of a CP in a corresponding first subframe; and a sending unit 602 And receiving the CP type information from the first determining unit 601, and sending the CP type information to the second communications node by using the first subframe, so that the second communications node can determine the first subframe according to the CP type information.
  • the type of CP is configured to determine cyclic prefix CP type information, where the CP type information indicates a type of a CP in a corresponding first subframe.
  • a sending unit 602 And receiving the CP type information from the first determining unit 601, and sending the CP type information to the second communications node by using the first subframe, so that the second communications node can determine the first subframe
  • the sending unit 602 includes:
  • a module configured to: place the CP type information in a first orthogonal frequency division multiple access OFDM symbol and/or a last OFDM symbol of a specific time slot in the first subframe;
  • a first sending module configured to send the CP type information by using the first OFDM symbol and/or the last OFDM symbol.
  • the first communication node further includes:
  • a adding unit configured to add a CP of the same type as the CP type information to the OFDM symbol carrying the CP type information before transmitting the CP type information to the second communication node by using the first subframe.
  • the specific time slot is the first time slot in the first subframe.
  • the first subframe includes a subframe that carries the CP type information.
  • the first subframe further includes N subframes after the subframe that carries the CP type information, where N is a positive integer.
  • the sending unit 602 further includes:
  • a second sending module configured to send the CP type information to the second communications node by using consecutive M subcarriers or discontinuous M subcarriers in the first subframe, where M is a positive integer.
  • the sending unit 602 further includes:
  • a third sending module configured to send the CP type information together with the demodulation reference signal to the second communication node by using the first subframe.
  • the first communication node further includes:
  • the first communication node further includes:
  • a notification unit configured to notify, by using a high layer signaling or a synchronization signal, a second communication node by using a type of the CP in the second subframe that does not correspond to the CP type information in the preset duration, so that the second communication node determines the second subframe The type of CP in.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • the embodiment provides a second communication node, which may be a user equipment UE, such as a mobile phone, a tablet computer, a PDA (Personal Digital Assistant), or a car computer.
  • the second communication node includes: a first receiving unit 701, configured to receive CP type information from the first communications node, where the CP type information is sent by the first communications node through the first subframe, and Corresponding to the first subframe; the second determining unit 702 is configured to acquire the CP type information from the first receiving unit 701, and determine, according to the CP type information, a type of the CP in the first subframe.
  • the first receiving unit 701 includes:
  • the first receiving module is configured to receive the CP type information by using a first OFDM symbol and/or a last OFDM symbol of a specific time slot in the first subframe.
  • the first receiving module is further configured to:
  • the normal OFDM symbol is used to demodulate the first OFDM symbol to obtain the CP type information
  • the normal OFDM symbol or the extended CP is used to demodulate the last OFDM symbol to obtain the CP type information.
  • the first subframe includes a subframe that carries the CP type information.
  • the first subframe further includes N subframes after the subframe that carries the CP type information, where N is a positive integer.
  • the second communication node further includes:
  • a second receiving unit configured to receive a type of a CP of the second subframe that does not correspond to the CP type information in the preset duration sent by the first communications node by using the high layer signaling or the synchronization signal, so that the second communications node determines the second subframe The type of CP of the frame.
  • the embodiment provides a first communication node, and the first communication node may be a network side device, such as a base station.
  • the first communications node includes: a first processor 801, configured to determine cyclic prefix CP type information, where the CP type information indicates a type of a CP in a corresponding first subframe;
  • the subframe transmits the CP type information to the second communication node to enable the second communication node to determine the type of the CP in the first subframe according to the CP type information.
  • the first communications node further includes:
  • the first memory 802 is connected to the first processor 801 for storing the CP type information.
  • the first transceiver 803 is connected to the first processor 801 for receiving the first The subframe transmits the CP type information to the second communication node.
  • first processor 801 is further configured to:
  • first processor 801 is further configured to:
  • a CP of the same type as the CP type information is added to the OFDM symbol carrying the CP type information.
  • the specific time slot is the first time slot in the first subframe.
  • the first subframe includes a subframe that carries the CP type information.
  • the first subframe further includes N subframes after the subframe that carries the CP type information, where N is a positive integer.
  • first processor 801 is further configured to:
  • the CP type information is sent to the second communication node by consecutive M subcarriers or discontinuous M subcarriers in the first subframe, where M is a positive integer.
  • first processor 801 is further configured to:
  • the CP type information is transmitted to the second communication node together with the demodulation reference signal through the first subframe. Further, the first processor 801 is further configured to:
  • first processor 801 is further configured to:
  • the present embodiment provides a second communication node, which may be a user equipment UE, such as a mobile phone, a tablet computer, a PDA (Personal Digital Assistant), or an on-board computer.
  • the second communications node includes: a second processor 901, configured to receive CP type information from the first communications node, where the CP type information is sent by the first communications node through the first subframe, And corresponding to the first subframe; according to the CP type information, determining the type of the CP in the first subframe.
  • the second communications node further includes:
  • the second transceiver 903 is connected to the second processor 901, configured to receive CP type information from the first communication node under control of the second processor, and send the received CP type information to the second processor. 901.
  • the second memory 902 is connected to the second processor 901 for storing the CP type information. Further, the second processor 901 is further configured to:
  • the CP type information is received by the first OFDM symbol and/or the last OFDM symbol of a particular time slot in the first subframe.
  • the second processor 901 is further configured to:
  • the normal OFDM symbol is used to demodulate the first OFDM symbol to obtain the CP type information
  • the normal OFDM symbol or the extended CP is used to demodulate the last OFDM symbol to obtain the CP type information.
  • the first subframe includes a subframe that carries the CP type information. Further, the first subframe further includes N subframes after the subframe that carries the CP type information, where N is a positive integer.
  • the second processor 901 is further configured to:
  • the first communication node first determines the CP type information corresponding to the first subframe, where the first communication node sends the first subframe to the second communication node, where the CP type information indicates The type of the CP in a subframe, the first communication node then transmitting the CP type information to the second communication node, so that the second communication node can determine the type of the CP in the first subframe according to the CP type information.
  • the first communication node may be a network side device, and the second communication node may be a user equipment UE.
  • the UE in the case of a common CP and an extended CP, there is a technical problem that the user equipment UE cannot know the CP type of the downlink transmission subframe in time, and the LTE system is implemented.
  • the UE can determine the technical effect of the type of the CP of the downlink subframe in time based on the CP type information.

Landscapes

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

Abstract

L'invention concerne un procédé d'envoi d'informations comprenant les étapes suivantes : un premier nœud de communication détermine des informations de type de préfixe cyclique (CP) indiquant un type de CP dans une première sous-trame correspondante ; et le premier nœud de communication envoie les informations de type de CP à un second nœud de communication, via la première sous-trame, afin de permettre au second nœud de communication de déterminer le type du CP dans la première sous-trame d'après les informations de type de CP. L'invention concerne également un procédé de détermination de type de CP, le premier nœud de communication et le second nœud de communication.
PCT/CN2013/084614 2013-09-29 2013-09-29 Procédé d'envoi d'informations, et procédé de détermination de type de cp Ceased WO2015042916A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201380001551.3A CN104685848A (zh) 2013-09-29 2013-09-29 一种发送信息的方法、及确定cp类型的方法
PCT/CN2013/084614 WO2015042916A1 (fr) 2013-09-29 2013-09-29 Procédé d'envoi d'informations, et procédé de détermination de type de cp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2013/084614 WO2015042916A1 (fr) 2013-09-29 2013-09-29 Procédé d'envoi d'informations, et procédé de détermination de type de cp

Publications (1)

Publication Number Publication Date
WO2015042916A1 true WO2015042916A1 (fr) 2015-04-02

Family

ID=52741850

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2013/084614 Ceased WO2015042916A1 (fr) 2013-09-29 2013-09-29 Procédé d'envoi d'informations, et procédé de détermination de type de cp

Country Status (2)

Country Link
CN (1) CN104685848A (fr)
WO (1) WO2015042916A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101843024A (zh) * 2007-10-30 2010-09-22 高通股份有限公司 在无线通信系统中传输控制信息的配置和方法
CN102377713A (zh) * 2010-08-12 2012-03-14 电信科学技术研究院 一种数据传输的方法、系统和设备
CN102752769A (zh) * 2011-04-19 2012-10-24 中兴通讯股份有限公司 一种无线通信系统中循环前缀类型的指示方法及装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101060513A (zh) * 2006-04-17 2007-10-24 北京三星通信技术研究有限公司 传送循环前缀信息的方法
CN101247551B (zh) * 2007-02-12 2011-09-21 华为技术有限公司 一种传输业务的方法及装置
CN101489282B (zh) * 2008-01-16 2011-12-28 中兴通讯股份有限公司 用于WiMAX演进系统的终端接入方法
CN101741798B (zh) * 2008-11-04 2013-04-10 电信科学技术研究院 一种实现多载波聚合传输的方法和装置
CN101772170A (zh) * 2009-01-04 2010-07-07 中兴通讯股份有限公司 通信系统中的系统信息管理及传输方法
CN101790202B (zh) * 2009-01-23 2013-07-10 电信科学技术研究院 一种循环前缀的配置方法、基站和终端
CN103220249B (zh) * 2012-01-19 2018-04-06 中兴通讯股份有限公司 一种信息的传输、配置方法及装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101843024A (zh) * 2007-10-30 2010-09-22 高通股份有限公司 在无线通信系统中传输控制信息的配置和方法
CN102377713A (zh) * 2010-08-12 2012-03-14 电信科学技术研究院 一种数据传输的方法、系统和设备
CN102752769A (zh) * 2011-04-19 2012-10-24 中兴通讯股份有限公司 一种无线通信系统中循环前缀类型的指示方法及装置

Also Published As

Publication number Publication date
CN104685848A (zh) 2015-06-03

Similar Documents

Publication Publication Date Title
KR101460107B1 (ko) 무선 통신 시스템에서 순환 전치 길이 변경 방법 및 이를 위한 시스템
CN111698779B (zh) 一种数据传输的方法、无线网络设备和通信系统
JP5065389B2 (ja) Ｏｆｄｍ通信環境におけるアップリンクアクセス要求
CN107306177B (zh) 传输数据的方法、用户设备和网络侧设备
CN107846373B (zh) 发送或接收物理下行控制信道的方法和设备
CN103685118B (zh) 一种数据的发送方法及装置
TWI772312B (zh) 基於無線網絡的通信方法、終端設備和網絡設備
CN104106232B (zh) 用于发送信令以支持灵活参考信号配置的方法和设备
WO2014107994A1 (fr) Procédé et dispositif d'envoi d'informations de commande et de réception d'informations de commande
WO2012006931A1 (fr) Procédé de transmission de csi-rs, procédé de contrôle et dispositif correspondant
TW202008828A (zh) 資源配置的方法和終端設備
TW202008829A (zh) 資源配置的方法和終端設備
WO2013107214A1 (fr) Procédé et appareil de communication sans fil
WO2014161495A1 (fr) Procédé et dispositif de transmission de données de liaison descendante et de traitement de transmission
CN105656597B (zh) 数据传输方法和设备
CN107710839B (zh) 通信方法和装置
WO2014173292A1 (fr) Procédé et dispositif de transmission de signal pilote
WO2014135002A1 (fr) Procédé et dispositif d'émission pmch
CN104812053B (zh) D2d通信同步信道的传输方法及系统、发送端及接收端
CN107734674A (zh) 数据传输的方法和系统
WO2017193874A9 (fr) Procédé de transmission d'informations, procédé de réception, équipement utilisateur et station de base
US8400952B2 (en) Method for transceiving a signal in wireless communication system
WO2014101040A1 (fr) Procédé et dispositif de traitement de signaux
WO2018171792A1 (fr) Procédé, appareil et système de transmission de signal de référence
WO2016119250A1 (fr) Procédé de transmission de données, équipement utilisateur, système et équipement de transmission

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13894525

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13894525

Country of ref document: EP

Kind code of ref document: A1