WO2016058444A1 - Procédé et dispositif d'envoi et de réception de signal de liaison descendante - Google Patents

Procédé et dispositif d'envoi et de réception de signal de liaison descendante Download PDF

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Publication number
WO2016058444A1
WO2016058444A1 PCT/CN2015/086892 CN2015086892W WO2016058444A1 WO 2016058444 A1 WO2016058444 A1 WO 2016058444A1 CN 2015086892 W CN2015086892 W CN 2015086892W WO 2016058444 A1 WO2016058444 A1 WO 2016058444A1
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subcarrier
mod
satisfies
index
subcarriers
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PCT/CN2015/086892
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English (en)
Chinese (zh)
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张雯
夏树强
戴博
毕峰
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中兴通讯股份有限公司
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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

Definitions

  • This document relates to the field of wireless communications, and in particular, to a method and an apparatus for transmitting and receiving downlink signals.
  • Machine Type Communication (MTC) User Equipment (UE), also known as Machine to Machine (M2M) user communication equipment, is the main application form of the Internet of Things.
  • MTC Machine Type Communication
  • UE User Equipment
  • M2M Machine to Machine
  • LTE Long-Term Evolution
  • LTE-Advance Long-Term Evolution Advance
  • MTC multi-class data services based on LTE/LTE-A will also be more attractive.
  • the cost of affecting MTC UEs is mainly in baseband processing and radio frequency. Reducing the downlink radio frequency receiving bandwidth of the UE is a very effective way to reduce the cost of the MTC UE. That is, the maximum supported downlink radio system bandwidth of the MTC UE is smaller than the maximum reception bandwidth of 20 MHz required by the conventional legacy LTE terminal under a single carrier.
  • the downlink radio reception bandwidth of the MTC UE may be 1.4 MHz.
  • all UEs whose downlink radio receiving bandwidth is smaller than the bandwidth of the eNB system are referred to as narrowband UEs, and are not limited to MTC UEs.
  • the direct current (DC) subcarrier is located at the center frequency position of the system bandwidth, and there is only one DC in the full bandwidth.
  • the direct current (DC) subcarrier operates within a narrow band of system bandwidth, and when its narrow band of operation is not in the RB (resource block) of the system bandwidth center, its DC position and DC position of the system bandwidth no longer coincide.
  • Embodiments of the present invention provide a method and an apparatus for transmitting and receiving a downlink signal to solve the problem of how to redefine a DC position for a narrowband UE.
  • a method for transmitting a downlink signal includes:
  • the evolved Node B eNB acquires the location of the DC DC subcarrier according to a preset manner and/or in a manner indicated by the control information;
  • the eNB maps the information to be sent to the physical resource for transmission; wherein, on the DC subcarrier, the eNB does not send a signal or send a predefined signal.
  • the acquiring the location of the DC DC subcarrier according to the preset manner includes:
  • the location of the DC subcarrier is determined according to a cell identity cell ID of the cell and/or a reference signal used by the eNB for the user terminal UE.
  • the location of the DC subcarrier is determined to satisfy one or more of the following conditions:
  • Determining the location of the DC subcarrier according to the reference signal used by the eNB for the user terminal UE includes: if the demodulation reference signal DMRS is adopted, on the resource block RB adopting the DMRS:
  • the DC subcarrier exists only on a symbol where the available physical downlink shared channel PDSCH is located.
  • the location of the DC subcarrier further satisfies the following conditions:
  • the location of the DC subcarrier further satisfies the condition that: the subframe of the channel state information measurement pilot configuration CSI-RS, where the DC subcarrier is on a subcarrier other than the subcarrier where the CSI-RS is located .
  • the location of the DC subcarrier further satisfies the following condition: for one eNB, a pre-configured narrowband for the UE, the DC subcarrier is a subcarrier closest to the center frequency of the narrowband, or is away from One of the most recent subcarriers of the narrowband's center frequency.
  • the location of the DC subcarrier is:
  • the narrowband is an odd number of RBs, and the DC subcarrier is on the middlemost RB of the pre-configured narrowband;
  • the DC subcarrier is on one of the two RBs in the middle of the pre-configured narrowband, and the RB in which the DC subcarrier is located is determined by the cell ID or the reference signal. determine.
  • the location of the DC subcarrier in the RB is determined by a cell ID or a reference signal.
  • the eNB is aligned with the resource block group RBG of the system for the narrowband pre-configured by the UE.
  • the narrowband that is pre-configured by the eNB for the UE is in accordance with the bandwidth from the center of the system to both sides. Divided by extension, or according to the way from the lowest frequency to the highest frequency or the highest frequency to the lowest frequency.
  • the acquiring the location of the subcarrier in a preset manner includes:
  • the location of the DC subcarrier is determined according to the RB occupied by the PDSCH of the scheduled UE.
  • the method for determining the location of the DC subcarrier according to the RB occupied by the PDSCH of the scheduled UE is one of the following:
  • the subcarriers in the set of available subcarriers on the scheduled RB and closest to the center of the most frequently scheduled RB to the highest RB are DC subcarriers.
  • obtaining the location of the DC subcarrier according to the manner indicated by the control information includes:
  • the absolute information and/or relative position information of the DC subcarriers are included in the control information; the location of the DC subcarriers is determined according to the absolute location information and/or the relative location information.
  • the method before acquiring the location of the DC DC subcarrier, the method further includes:
  • the step of acquiring a location of the DC DC subcarrier is obtained in the available subcarrier set or a subset thereof;
  • the available subcarriers in the set of available subcarriers are determined according to a cell identity cell ID of the cell and/or a reference signal used by the eNB for the user terminal UE.
  • the available subcarriers exist only on the symbol where the available physical downlink shared channel PDSCH is located.
  • the available subcarriers further satisfy the following conditions:
  • the available subcarriers further satisfy a condition that: a subframe of a CSI-RS is configured in a channel state information measurement pilot, where the available subcarriers are on subcarriers other than the subcarrier where the CSI-RS is located.
  • the DC subcarrier is the pre-configured narrowband DC subcarrier.
  • the DC subcarrier corresponding to the control channel of the narrowband UE and the DC subcarrier corresponding to the traffic channel of the narrowband UE do not coincide.
  • the locations of the DC subcarriers of the neighboring cells are the same.
  • the step of acquiring the location of the DC subcarrier further includes: the eNB notifying the neighboring eNB of the location of the acquired DC subcarrier.
  • mapping, by the eNB, the information to be sent to the physical resource includes:
  • the eNB maps the information to be sent to all subcarriers, and then deletes the information mapped on the DC subcarriers or replaces them with a predefined signal.
  • a method for receiving a downlink signal includes:
  • the user terminal UE acquires the location of the DC DC subcarrier according to a preset manner and/or in a manner indicated by the control information;
  • the UE receives the downlink signal according to the determined location of the DC subcarrier and performs demapping.
  • the acquiring the location of the subcarrier in a preset manner includes:
  • the location of the DC subcarrier is determined according to a cell identifier cell ID of the cell and/or a reference signal used by the eNB for the user terminal UE.
  • the location of the DC subcarrier satisfies one or more of the following conditions:
  • the DC subcarrier exists only on a symbol where the available physical downlink shared channel PDSCH is located.
  • the location of the DC subcarrier further satisfies the following conditions:
  • the location of the DC subcarrier further satisfies the condition that: the subframe of the channel state information measurement pilot configuration CSI-RS, where the DC subcarrier is on a subcarrier other than the subcarrier where the CSI-RS is located .
  • the location of the DC subcarrier further satisfies the following condition: UE for one eNB A pre-configured narrowband, the DC subcarrier being one of the subcarriers closest to the center frequency of the narrowband, or one of a plurality of subcarriers closest to the center frequency of the narrowband.
  • the location of the DC subcarrier is:
  • the narrowband is an odd number of RBs, and the DC subcarrier is on the middlemost RB of the pre-configured narrowband;
  • the DC subcarrier is on one of the two RBs in the middle of the pre-configured narrowband, and the RB in which the DC subcarrier is located is determined by the cell ID or the reference signal. determine.
  • the location of the DC subcarrier in the RB is determined by a cell ID or a reference signal.
  • the eNB is aligned with the resource block group RBG of the system for the narrowband pre-configured by the UE.
  • the acquiring the location of the subcarrier in a preset manner includes:
  • the location of the DC subcarrier is determined according to the RB occupied by the PDSCH of the UE.
  • the method for determining a location of a DC subcarrier according to an RB occupied by a PDSCH of the UE is one of the following:
  • the subcarriers in the set of available subcarriers on the scheduled RB and closest to the center of the most frequently scheduled RB to the highest RB are DC subcarriers.
  • obtaining the location of the DC subcarrier according to the manner indicated by the control information includes:
  • the absolute information and/or relative position information of the DC subcarriers are included in the control information; the location of the DC subcarriers is determined according to the absolute location information and/or the relative location information.
  • the method before obtaining the location of the DC DC subcarrier, the method further includes:
  • the step of acquiring a location of the DC DC subcarrier is obtained in the available subcarrier set or a subset thereof;
  • the available subcarriers in the set of available subcarriers are determined according to the cell identity cell ID of the cell and/or the reference signal used by the eNB for the user terminal UE.
  • the available subcarriers satisfy one or more of the following conditions:
  • the available subcarriers exist only in the available physical downlink shared channel PDSCH. On the symbol.
  • the available subcarriers further satisfy the following conditions:
  • the available subcarriers further satisfy a condition that: a subframe of a CSI-RS is configured in a channel state information measurement pilot, where the available subcarriers are on subcarriers other than the subcarrier where the CSI-RS is located.
  • the DC subcarrier is the pre-configured narrowband DC subcarrier.
  • the DC subcarrier corresponding to the control channel and the DC subcarrier corresponding to the traffic channel of the UE do not coincide.
  • the receiving, by the UE, the downlink signal according to the determined location of the DC subcarrier and performing demapping includes:
  • the UE adjusts a radio frequency RF center frequency point to a position of the DC subcarrier, and performs downlink signal reception;
  • the UE When the eNB maps information to be transmitted to subcarriers other than the DC subcarrier, the UE demaps subcarriers other than the DC subcarrier in the downlink signal; when the eNB is to be sent When the information is mapped to all subcarriers, the UE demaps all subcarriers in the downlink signal.
  • a device for transmitting a downlink signal which is disposed in an evolved Node B eNB, and includes:
  • Obtaining a module configured to: obtain a position of a DC DC subcarrier according to a preset manner, and/or according to a manner indicated by the control information;
  • the sending module is configured to: map the information to be sent to the physical resource for sending; where, on the DC subcarrier, no signal is sent or a predefined signal is sent.
  • the acquiring module is configured to determine a location of the DC subcarrier according to a cell identifier cell ID of the cell and/or a reference signal used by the eNB for the user terminal UE.
  • the location of the DC subcarrier determined by the acquiring module meets one or more of the following conditions:
  • the DC subcarrier exists only on a symbol where the available physical downlink shared channel PDSCH is located.
  • the location of the DC subcarrier further satisfies the following conditions:
  • the location of the DC subcarrier further satisfies the condition that: the subframe of the channel state information measurement pilot configuration CSI-RS, where the DC subcarrier is on a subcarrier other than the subcarrier where the CSI-RS is located .
  • the location of the DC subcarrier further satisfies the following condition: for one eNB, a pre-configured narrowband for the UE, the DC subcarrier is a subcarrier closest to the center frequency of the narrowband, or is away from One of the most recent subcarriers of the narrowband's center frequency.
  • the location of the DC subcarrier is:
  • the narrowband is an odd number of RBs, and the DC subcarrier is on the middlemost RB of the pre-configured narrowband;
  • the DC subcarrier is on one of the two RBs in the middle of the pre-configured narrowband, and the RB in which the DC subcarrier is located is determined by the cell ID or the reference signal. determine.
  • the location of the DC subcarrier in the RB is determined by a cell ID or a reference signal.
  • the eNB is aligned with the resource block group RBG of the system for the narrowband pre-configured by the UE.
  • the narrowband pre-configured by the eNB for the UE is divided according to the manner from the center of the system bandwidth to the two sides, or is divided according to the mode from the lowest frequency to the highest frequency or the highest frequency to the lowest frequency.
  • the obtaining, by the acquiring module, the location of the subcarrier according to a preset manner is:
  • the acquiring module determines a location of the DC subcarrier according to the RB occupied by the PDSCH of the scheduled UE.
  • the acquiring module determines, according to the RB occupied by the PDSCH of the scheduled UE, a manner of determining a position of the DC subcarrier as one of the following:
  • the obtaining module determines, by using the lowest RB of the scheduled frequency to all the RBs between the highest RBs, as the location of the DC subcarrier that is pre-configured by the system for the UE;
  • the acquiring module determines, according to a preset rule, a RB of the narrowband in which the eNB is pre-configured by the eNB according to a preset rule, and determines a location of the DC subcarrier;
  • the sub-carrier in the available RB set on the scheduled RB and closest to the center of the highest frequency RB to the highest RB is the DC sub-carrier.
  • the acquiring, by the acquiring module, the location of the DC subcarrier according to the manner indicated by the control information refers to:
  • the acquiring module includes absolute location information and/or relative location information of the DC subcarrier in the control information; determining a location of the DC subcarrier according to the absolute location information and/or the relative location information.
  • the acquiring module is configured to acquire a DC DC subcarrier in a predefined set of available subcarriers or a subset thereof;
  • the available subcarriers in the set of available subcarriers are determined according to the cell identity cell ID of the cell and/or the reference signal used by the eNB for the user terminal UE.
  • the available subcarriers satisfy one or more of the following conditions:
  • the available subcarriers exist only on the symbol where the available physical downlink shared channel PDSCH is located.
  • the available subcarriers further satisfy the following conditions:
  • the available subcarriers further satisfy a condition that: a subframe of a CSI-RS is configured in a channel state information measurement pilot, where the available subcarriers are on subcarriers other than the subcarrier where the CSI-RS is located.
  • the DC subcarrier is the pre-configured narrowband DC subcarrier.
  • the DC subcarrier corresponding to the control channel of the narrowband UE and the DC subcarrier corresponding to the traffic channel of the narrowband UE do not coincide.
  • the locations of the DC subcarriers acquired by the acquiring module of the neighboring cell are the same.
  • the acquiring module is further configured to notify the neighboring eNB of the location of the acquired DC subcarrier.
  • mapping the information to be sent to the physical resource sending:
  • the sending module maps the information to be sent to all subcarriers, and then deletes the information mapped on the DC subcarrier or replaces it with a predefined signal and then sends the information.
  • a receiving device for a downlink signal which is disposed in a user terminal, and includes:
  • Obtaining a module configured to acquire a position of a DC DC subcarrier according to a preset manner, and/or according to a manner indicated by the control information;
  • the receiving module is configured to receive the downlink signal according to the determined location of the DC subcarrier and perform demapping.
  • the acquiring module is configured to determine a location of the DC subcarrier according to a cell identifier cell ID of the cell and/or a reference signal used by the eNB for the user terminal UE.
  • the location of the DC subcarrier determined by the acquiring module meets one or more of the following conditions:
  • the DC subcarrier exists only on a symbol where the available physical downlink shared channel PDSCH is located.
  • the location of the DC subcarrier further satisfies the following conditions:
  • the location of the DC subcarrier further satisfies the condition that: the subframe of the channel state information measurement pilot configuration CSI-RS, where the DC subcarrier is on a subcarrier other than the subcarrier where the CSI-RS is located .
  • the location of the DC subcarrier further satisfies the following condition: UE for one eNB A pre-configured narrowband, the DC subcarrier being one of the subcarriers closest to the center frequency of the narrowband, or one of a plurality of subcarriers closest to the center frequency of the narrowband.
  • the location of the DC subcarrier is:
  • the narrowband is an odd number of RBs, and the DC subcarrier is on the middlemost RB of the pre-configured narrowband;
  • the DC subcarrier is on one of the two RBs in the middle of the pre-configured narrowband, and the RB in which the DC subcarrier is located is determined by the cell ID or the reference signal. determine.
  • the location of the DC subcarrier in the RB is determined by a cell ID or a reference signal.
  • the eNB is aligned with the resource block group RBG of the system for the narrowband pre-configured by the UE.
  • the obtaining, by the acquiring module, the location of the subcarrier according to a preset manner is:
  • the acquiring module determines the location of the DC subcarrier according to the RB occupied by the PDSCH of the UE.
  • the acquiring module determines, according to the RB occupied by the PDSCH of the local UE, a location of the DC subcarrier as one of the following:
  • the obtaining module determines, by using the lowest RB of the scheduled frequency to all the RBs between the highest RBs, as the location of the DC subcarrier that is pre-configured by the system for the UE;
  • the acquiring module determines, according to a preset rule, a RB of the narrowband in which the eNB is pre-configured by the eNB according to a preset rule, and determines a location of the DC subcarrier;
  • the sub-carrier in the available RB set on the scheduled RB and closest to the center of the highest frequency RB to the highest RB is the DC sub-carrier.
  • the acquiring, by the acquiring module, the location of the DC subcarrier according to the manner indicated by the control information refers to:
  • the acquiring module includes absolute position information and/or relative position information of the DC subcarrier in the control information; determining bits of the DC subcarrier according to the absolute position information and/or relative position information. Set.
  • the acquiring module is configured to acquire a location of acquiring a DC DC subcarrier in a predefined set of available subcarriers or a subset thereof;
  • the available subcarriers in the set of available subcarriers are determined according to the cell identity cell ID of the cell and/or the reference signal used by the eNB for the user terminal UE.
  • the available subcarriers satisfy one or more of the following conditions:
  • the available subcarriers exist only on the symbol where the available physical downlink shared channel PDSCH is located.
  • the available subcarriers further satisfy the following conditions:
  • the available subcarriers further satisfy a condition that: a subframe of a CSI-RS is configured in a channel state information measurement pilot, where the available subcarriers are on subcarriers other than the subcarrier where the CSI-RS is located.
  • the DC subcarrier is the pre-configured narrowband DC subcarrier.
  • the DC subcarrier corresponding to the control channel and the DC subcarrier corresponding to the traffic channel of the UE do not coincide.
  • the receiving module receiving the downlink signal according to the determined location of the DC subcarrier and performing demapping means:
  • the receiving module adjusts a radio frequency RF center frequency point to a position of the DC subcarrier to perform downlink signal reception; when the eNB maps information to be transmitted to subcarriers other than the DC subcarrier, The subcarriers other than the DC subcarriers in the downlink signal are demapped; when the eNB maps the information to be transmitted to all subcarriers, all subcarriers in the downlink signal are demapped.
  • a computer readable storage medium storing program instructions that, when executed, implement the methods described above.
  • the embodiment of the present invention defines a DC location for a narrowband UE.
  • an eNB base station
  • the DC location is vacated or a predefined signal is sent at the DC location to avoid interference.
  • FIG. 1 is a schematic flowchart of a method for transmitting a downlink signal according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a downlink signal sending apparatus according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a downlink signal receiving apparatus according to an embodiment of the present invention.
  • Embodiment 4 is a schematic diagram of a narrowband configuration manner in Embodiment 1;
  • FIG. 5 is a schematic diagram of an example of a non-MBSFN subframe DC position.
  • Figure 7 is an example of the DC position of an MBSFN subframe.
  • Figure 8 is a schematic diagram of DC locations for non-MBSFN subframes.
  • Fig. 9 is an example in which DC is an integer multiple of 300 kHz.
  • FIG. 10 is a diagram showing an arrangement of RBs of a narrowband UE in a narrow band.
  • FIG. 11 is a schematic diagram of a DC corresponding to a control channel and a traffic channel of a UE.
  • Figure 13 is an example of the indication information in a control message being a relative value.
  • a method for transmitting a downlink signal includes:
  • Step 10 The eNB acquires the location of the DC subcarrier according to a preset manner, and/or according to the manner indicated by the control information.
  • Step 11 The eNB maps the information to be sent to the physical resource for transmission; where, on the DC subcarrier, the eNB does not send a signal or sends a predefined signal.
  • the predefined signal is a preset signal, which is a signal well known to the eNB and the UE, and the UE knows the format of the signal, for example, the parameter The test signal, but not limited to the reference signal.
  • the acquiring the location of the subcarrier according to the preset manner may include:
  • the location of the DC subcarrier satisfies one or more of the following conditions:
  • Condition 1 The location of the DC subcarrier is determined according to the cell ID (cell identity) of the cell.
  • Condition 2 The location of the DC subcarrier is determined according to the reference signal employed by the eNB for the UE.
  • the DC subcarrier is on the RB using the DMRS:
  • the DC subcarrier exists only on the symbol where the available PDSCH (Physical Downlink Shared Channel) is located (Condition 3).
  • the location of the DC subcarrier further satisfies the condition 5: a subframe in which a CSI-RS (Channel State Information Measurement Pilot) is configured, where the DC is in a subcarrier where the CSI-RS is located. On the outer subcarrier.
  • CSI-RS Channel State Information Measurement Pilot
  • the location of the DC subcarrier further satisfies the following condition: for a narrowband pre-configured by the UE for the eNB, the DC subcarrier is a subcarrier closest to the center frequency of the narrowband Or one of a plurality of subcarriers closest to the center frequency of the narrowband.
  • the location of the DC subcarrier can be, but is not limited to:
  • the narrowband is an odd number of RBs, and the DC subcarrier is on the middlemost RB of the pre-configured narrowband;
  • the DC subcarrier is on one of the two RBs in the middle of the pre-configured narrowband, and the RB in which the DC subcarrier is located is determined by the cell ID or the reference signal. determine.
  • the location of the DC subcarrier in the RB may be, but is not limited to, determined by a cell ID or a reference signal.
  • the narrowband pre-configured by the eNB for the UE may be, but is not limited to, aligned with the RBG (Resource Block Group) of the system.
  • RBG Resource Block Group
  • mapping, by the eNB, the information to be sent to the physical resource includes:
  • the eNB maps the information to be sent to all subcarriers, and then deletes the information mapped on the DC subcarriers or replaces them with a predefined signal.
  • the acquiring the location of the subcarrier according to the preset manner may include:
  • the location of the DC subcarrier is determined according to the RB occupied by the PDSCH of the scheduled UE.
  • the method for determining a DC subcarrier according to the RB occupied by the PDSCH of the scheduled UE is one of the following:
  • All the RBs with the lowest frequency of the scheduled RB to the highest RB are used as the pre-configured narrowband of the UE to determine the location of the DC subcarrier; for example, if the scheduling is RB#0 ⁇ 11, then RB#0 ⁇ 11 are seen.
  • the subcarriers in the set of available subcarriers on the scheduled RB and closest to the center of the most frequently scheduled RB to the highest RB are DC subcarriers.
  • determining the location of the DC subcarrier according to the manner indicated by the control information includes:
  • the absolute information and/or relative position information of the DC subcarriers are included in the control information; the location of the DC subcarriers is determined according to the absolute location information and/or the relative location information.
  • the method before the location of the DC subcarrier is obtained, the method further includes: presetting or predefining a set of available subcarriers, where the step of acquiring the location of the DC DC subcarrier is Obtained in the set of available subcarriers or a subset thereof;
  • Each available subcarrier in the set of available subcarriers is a set of subcarriers that satisfy one or more of the conditions 1 to 5 in Embodiment 1.
  • the DC subcarrier is the pre-configured narrowband DC subcarrier.
  • the narrowband is two: RB#0 ⁇ 5 and RB#6 ⁇ 11.
  • the DC subcarrier is a narrowband RB.
  • the DC subcarriers corresponding to the control channel of the narrowband UE and the DC subcarriers corresponding to the traffic channel of the UE do not coincide.
  • the positions of the DC subcarriers of the neighboring cells are the same.
  • the step of acquiring the location of the DC subcarrier further includes: the eNB notifying the neighboring eNB of the location of the acquired DC subcarrier.
  • a method for receiving a downlink signal includes:
  • the user terminal UE acquires the location of the DC DC subcarrier according to a preset manner and/or in a manner indicated by the control information;
  • the UE receives the downlink signal according to the determined location of the DC subcarrier and performs demapping.
  • Embodiment 1 The acquiring the location of the subcarrier according to the preset manner includes:
  • the location of the DC subcarrier satisfies one or more of the following conditions:
  • the location of the DC subcarrier is determined according to the cell identifier cell ID of the cell;
  • Condition 2 The location of the DC subcarrier is determined according to a reference signal used by the eNB for the user terminal UE;
  • the DC subcarrier is on the resource block RB using the DMRS:
  • the DC subcarrier exists only on the symbol where the available physical downlink shared channel PDSCH is located (condition 3).
  • the location of the DC subcarrier further satisfies the following condition 4:
  • the location of the DC subcarrier further satisfies the condition 5: configuring a pilot configuration CSI-RS subframe in the channel state information, where the DC subcarrier is in a subcarrier where the CSI-RS is located On the subcarriers other than .
  • the location of the DC subcarrier further satisfies the following condition: for a narrowband pre-configured by the UE for the eNB, the DC subcarrier is a subcarrier closest to the center frequency of the narrowband Or one of a plurality of subcarriers closest to the center frequency of the narrowband.
  • the location of the DC subcarrier may be:
  • the narrowband is an odd number of RBs, and the DC subcarrier is on the middlemost RB of the pre-configured narrowband;
  • the DC subcarrier is pre-configured. On one of the RBs of the two most intermediate RBs in the narrowband, the RB in which the DC subcarrier is located is determined by the cell ID or the reference signal.
  • the location of the DC subcarrier in the RB may be determined by a cell ID or a reference signal.
  • the narrowband pre-configured by the eNB for the UE may be aligned with the resource block group RBG of the system.
  • Embodiment 2 The acquiring the location of the subcarrier according to the preset manner includes:
  • the location of the DC subcarrier is determined according to the RB occupied by the PDSCH of the UE.
  • the method for determining the location of the DC subcarrier according to the RB occupied by the PDSCH of the UE is one of the following:
  • the subcarriers in the set of available subcarriers on the scheduled RB and closest to the center of the most frequently scheduled RB to the highest RB are DC subcarriers.
  • Embodiment 3 Acquiring the location of the DC subcarrier according to the manner indicated by the control information includes:
  • the absolute information and/or relative position information of the DC subcarriers are included in the control information; the location of the DC subcarriers is determined according to the absolute location information and/or the relative location information.
  • the method further includes:
  • the step of acquiring a location of the DC DC subcarrier is obtained in the available subcarrier set or a subset thereof;
  • the available subcarriers in the set of available subcarriers satisfy one or more of the above conditions 1 to 5.
  • the DC subcarrier is the pre-configured narrowband DC subcarrier.
  • Embodiment 4 When the UE is a narrowband UE, the DC subcarriers corresponding to the control channel and the DC subcarriers corresponding to the traffic channel of the UE do not coincide.
  • Embodiment 5 The receiving, by the UE, the downlink signal according to the determined location of the DC subcarrier and performing demapping includes:
  • the UE adjusts a radio frequency RF center frequency point to a position of the DC subcarrier, and performs downlink signal reception;
  • the UE When the eNB maps information to be transmitted to subcarriers other than the DC subcarrier, the UE demaps subcarriers other than the DC subcarrier in the downlink signal; when the eNB is to be sent When the information is mapped to all subcarriers, the UE demaps all subcarriers in the downlink signal.
  • the mapping mode adopted by the eNB may be agreed with the UE in advance or set a default mapping mode, or may be notified to the UE or acquired by the UE.
  • a downlink signal sending apparatus is disposed in an eNB, and includes:
  • the obtaining module 20 is configured to acquire a position of the DC DC subcarrier according to a preset manner and/or according to a manner indicated by the control information;
  • the sending module 21 is configured to map the information to be sent to the physical resource for transmission; wherein, on the DC subcarrier, no signal is sent or a predefined signal is sent.
  • Embodiment 1 The acquiring module acquires the location of the subcarrier according to a preset manner, where:
  • the location of the DC subcarrier determined by the obtaining module meets one or more of the following conditions:
  • the location of the DC subcarrier is determined according to the cell identifier cell ID of the cell;
  • Condition 2 The location of the DC subcarrier is determined according to a reference signal used by the eNB for the user terminal UE;
  • the DC subcarrier is on the resource block RB using the DMRS:
  • the DC subcarrier exists only on the symbol where the available physical downlink shared channel PDSCH is located (condition 3).
  • the location of the DC subcarrier further satisfies the following condition 4:
  • the location of the DC subcarrier further satisfies the following condition 5: in the letter
  • the track state information measurement pilot configures a subframe of a CSI-RS, and the DC subcarrier is on a subcarrier other than the subcarrier where the CSI-RS is located.
  • the location of the DC subcarrier further satisfies the following condition: for a narrowband pre-configured by the UE for the eNB, the DC subcarrier is a subcarrier closest to the center frequency of the narrowband Or one of a plurality of subcarriers closest to the center frequency of the narrowband.
  • the location of the DC subcarrier may be:
  • the narrowband is an odd number of RBs, and the DC subcarrier is on the middlemost RB of the pre-configured narrowband;
  • the DC subcarrier is on one of the two RBs in the middle of the pre-configured narrowband, and the RB in which the DC subcarrier is located is determined by the cell ID or the reference signal. determine.
  • the location of the DC subcarrier in the RB may be determined by a cell ID or a reference signal.
  • the narrowband pre-configured by the eNB for the UE may be aligned with the resource block group RBG of the system.
  • the narrowband pre-configured by the eNB for the UE may be divided according to the manner from the center of the system bandwidth to the two sides, or divided according to the lowest to highest frequency or the highest to lowest frequency.
  • Embodiment 2 The acquiring module acquires the location of the subcarrier according to a preset manner, where:
  • the acquiring module determines a location of the DC subcarrier according to the RB occupied by the PDSCH of the scheduled UE.
  • the acquiring module determines, according to the RB occupied by the PDSCH of the scheduled UE, a manner of determining a position of the DC subcarrier as one of the following:
  • the obtaining module determines, by using the lowest RB of the scheduled frequency to all the RBs between the highest RBs, as the location of the DC subcarrier that is pre-configured by the system for the UE;
  • the acquiring module determines, according to a preset rule, a RB of the narrowband in which the eNB is pre-configured by the eNB according to a preset rule, and determines a location of the DC subcarrier;
  • the sub-carrier in the available RB set on the scheduled RB and closest to the center of the highest frequency RB to the highest RB is the DC sub-carrier.
  • Embodiment 3 The obtaining, by the acquiring module, the location of the DC subcarrier according to the manner indicated by the control information refers to:
  • the acquiring module includes absolute location information and/or relative location information of the DC subcarrier in the control information; determining a location of the DC subcarrier according to the absolute location information and/or the relative location information.
  • the obtaining module acquires the location of the DC DC subcarrier in a predefined set of available subcarriers or a subset thereof;
  • the available subcarriers in the set of available subcarriers satisfy one or more of the above conditions 1 to 5.
  • the DC subcarrier is the pre-configured narrowband DC subcarrier.
  • Embodiment 4 The DC subcarrier corresponding to the control channel of the narrowband UE and the DC subcarrier corresponding to the traffic channel of the narrowband UE do not coincide.
  • Embodiment 5 The positions of the DC subcarriers acquired by the acquiring module of the neighboring cell are the same.
  • the acquiring module is further configured to notify the neighboring cell eNB of the location of the acquired DC subcarrier.
  • Embodiment 6 The sending module mapping the information to be sent to the physical resource to send is:
  • the sending module maps the information to be sent to all subcarriers, and then deletes the information mapped on the DC subcarrier or replaces it with a predefined signal and then sends the information.
  • an embodiment of the present invention further provides a downlink signal receiving apparatus, which is disposed in a user terminal, and includes:
  • the obtaining module 30 is configured to acquire a position of the DC DC subcarrier according to a preset manner, and/or according to a manner indicated by the control information;
  • the receiving module 31 is configured to receive the downlink signal according to the determined location of the DC subcarrier and perform demapping.
  • Embodiment 1 The acquiring module acquires the location of the subcarrier according to a preset manner, including:
  • the location of the DC subcarrier determined by the obtaining module meets one or more of the following conditions:
  • the location of the DC subcarrier is determined according to the cell identifier cell ID of the cell;
  • Condition 2 The location of the DC subcarrier is determined according to a reference signal used by the eNB for the user terminal UE;
  • the DC subcarrier is on the resource block RB using the DMRS:
  • the DC subcarrier exists only on the symbol where the available physical downlink shared channel PDSCH is located (condition 3).
  • the location of the DC subcarrier further satisfies the following condition 4:
  • the location of the DC subcarrier further satisfies the condition 5: configuring a pilot configuration CSI-RS subframe in the channel state information, where the DC subcarrier is in a subcarrier where the CSI-RS is located On the subcarriers other than .
  • the location of the DC subcarrier further satisfies the following condition: for a narrowband pre-configured by the UE for the eNB, the DC subcarrier is a subcarrier closest to the center frequency of the narrowband Or one of a plurality of subcarriers closest to the center frequency of the narrowband.
  • the location of the DC subcarrier may be:
  • the narrowband is an odd number of RBs, and the DC subcarrier is on the middlemost RB of the pre-configured narrowband;
  • the DC subcarrier is on one of the two RBs in the middle of the pre-configured narrowband, and the RB in which the DC subcarrier is located is determined by the cell ID or the reference signal. determine.
  • the location of the DC subcarrier in the RB may be determined by a cell ID or a reference signal.
  • the narrowband that is pre-configured by the eNB for the UE may be compared with the resource block group RBG of the system. Qi.
  • Embodiment 2 The acquiring module acquires the location of the subcarrier according to a preset manner, where:
  • the acquiring module determines the location of the DC subcarrier according to the RB occupied by the PDSCH of the UE.
  • the acquiring module determines the location of the DC subcarrier according to the RB occupied by the PDSCH of the UE is one of the following:
  • the obtaining module determines, by using the lowest RB of the scheduled frequency to all the RBs between the highest RBs, as the location of the DC subcarrier that is pre-configured by the system for the UE;
  • the acquiring module determines, according to a preset rule, a RB of the narrowband in which the eNB is pre-configured by the eNB according to a preset rule, and determines a location of the DC subcarrier;
  • the sub-carrier in the available RB set on the scheduled RB and closest to the center of the highest frequency RB to the highest RB is the DC sub-carrier.
  • Embodiment 3 The obtaining, by the acquiring module, the location of the DC subcarrier according to the manner indicated by the control information refers to:
  • the acquiring module includes absolute location information and/or relative location information of the DC subcarrier in the control information; determining a location of the DC subcarrier according to the absolute location information and/or the relative location information.
  • Embodiments 2 and 3 optionally, when the acquiring module acquires the location of the DC DC subcarrier, it is obtained in a predefined set of available subcarriers or a subset thereof;
  • the available subcarriers in the set of available subcarriers satisfy one or more of the above conditions 1 to 5
  • the DC subcarrier is the pre-configured narrowband DC subcarrier.
  • Embodiment 4 When the UE is a narrowband UE, the DC subcarriers corresponding to the control channel and the DC subcarriers corresponding to the traffic channel of the UE do not coincide.
  • Embodiment 5 The receiving, according to the determined location of the DC subcarrier, receiving a downlink signal and performing demapping means:
  • the receiving module adjusts a radio frequency RF center frequency point to a position of the DC subcarrier, and performs the next Receiving a row signal; when an eNB maps information to be transmitted to a subcarrier other than the DC subcarrier, demaps a subcarrier other than the DC subcarrier in the downlink signal; when the eNB When the information to be transmitted is mapped to all subcarriers, all subcarriers in the downlink signal are demapped.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • a narrowband UE For a narrowband UE, it operates within a narrow band of system bandwidth, and when its narrow band of operation is not one or more RBs in the center of the system, its DC subcarrier location and DC subcarrier location of the system bandwidth no longer coincide.
  • the eNB when transmitting the downlink signal, the eNB no longer transmits a signal at the newly defined DC subcarrier position, or transmits a predefined signal, such as a pilot signal.
  • the PDCCH Physical Downlink Control Channel
  • the PDCCH is not included in the PDCCH, and the PDCCH is not included in the symbol of the PDCCH.
  • the DC subcarriers exist only on the symbol where the available PDSCH region is located.
  • the position of the DC subcarrier is determined according to a preset manner.
  • Obtaining the location of the DC subcarrier according to a preset manner includes: determining a location of the DC subcarrier according to one or more of the following conditions:
  • Condition 1 The DC subcarrier position is determined by the cell ID of the cell.
  • the DC subcarrier position is determined by the eNB for the reference signal employed by the UE.
  • the DC subcarrier is on the RB that uses the DMRS
  • the UE-specific reference signal herein refers to the reference signal transmitted on port 5.
  • the UE-specific reference signal herein refers to the reference signal transmitted on port 5.
  • the DC subcarrier exists only on the symbol where the available PDSCH is located.
  • the DC subcarriers should also satisfy:
  • the PRS is not transmitted at the location.
  • the system configures a CSI-RS
  • the DC subcarrier is on a subcarrier other than the subcarrier where the CSI-RS is located.
  • the DC subcarrier is one subcarrier closest to the center frequency of the narrowband, or is a plurality of subcarriers closest to the center frequency of the narrowband. one of. It is assumed that the maximum number of RBs corresponding to the maximum bandwidth supported by the UE is N RB , and the system pre-configured N RB + n RBs for the UE, where n is an integer. Then, for the case where N RB +n is even, the DC subcarrier is on the subcarriers of the two most RBs; for the case where N RB +n is odd, the DC subcarrier is on the subcarrier of the most intermediate RB. .
  • the RBs described herein are RBs defined in the legacy system, and the system may also redefine another RB configuration for narrowband UEs within the narrowband.
  • the narrowband pre-configured by the eNB for the UE should be aligned with the RBG of the system to avoid generating RB fragments.
  • the eNB is a pre-configured narrowband of the UE, and may be divided according to a manner of extending from a system bandwidth center to two sides.
  • the center 6 RBs are a narrow band
  • the other narrow bands are narrow bands extended to both sides, as shown in the figure. 4; or according to the way from the lowest frequency to the highest, such as every 6 RB is divided into a narrow band.
  • the division of narrow bands can also overlap. That is to say, one RB can belong to multiple narrowbands.
  • the manner of receiving the narrowband including the DC on the system bandwidth and the narrowband receiving the other location may be different or the same.
  • the DC subcarrier should be located at an integer multiple of 300 KHz.
  • the eNB may send a synchronization signal on a narrowband where the DC subcarrier is located, and further, may send an MIB (Master Information Block) and/or an SIB (System Information Block) on the narrowband. ).
  • MIB Master Information Block
  • SIB System Information Block
  • the narrowband UE can be swept to find the DC subcarrier and receive a synchronization signal, MIB and/or SIB, on the narrowband where the DC subcarrier is located.
  • the DC subcarrier position of the neighboring cell may be set to the same subcarrier, so as to prevent the neighboring cell from transmitting too much power at the DC subcarrier position of the local cell, causing interference.
  • the eNB after determining the DC subcarrier location, notifies the neighboring cell eNB of the DC subcarrier location, so as to prevent the neighboring cell eNB from transmitting too much power at the DC subcarrier location of the cell, causing interference.
  • N RB is assumed that the maximum number of narrow-band supported by the UE corresponding to the bandwidth of the narrowband N RB, narrowband systems narrowband UE is pre-configured number RB N RB, narrow band in accordance with the order of increasing frequency N RB RBs are renumbered as 0, 1, 2, ... N RB -1.
  • the system is configured with CSI-RS and adopts CSI-RS configuration #0. It is assumed that there is no DMRS and PRS in the narrowband, and the system bandwidth is 20M.
  • N RB RBs are a narrow band of narrowband UE operation. Then, if N RB is even, there are:
  • the subcarrier with the highest frequency among the RBs numbered N RB /2-1 is selected as the DC subcarrier.
  • the subcarrier with the highest frequency among the RBs numbered N RB /2-1 is selected as the DC subcarrier, or the subcarrier with the lowest frequency among the RBs numbered N RB /2 is used as the DC subcarrier. Carrier.
  • the lowest frequency subcarrier among the RBs numbered N RB /2 is selected as the DC subcarrier.
  • the sixth subcarrier of the frequency in the RB is from low to high (from 1 to 1, as is assumed in the following description) as a DC subcarrier.
  • the selection number is The 6th subcarrier or the 7th subcarrier of the frequency in the RB from low to high is used as the DC subcarrier.
  • the selection number is The seventh subcarrier of the frequency in the RB from low to high is used as the DC subcarrier.
  • Figure 5 is a schematic diagram of the location of a non-MBSFN subframe DC subcarrier.
  • the cell ID mod 3 0, and the maximum number of RBs occupied by the narrowband of the narrowband UE is 6, which is RB#4 to RB#9 in the shaded portion of FIG. 5, and the PDCCH occupies the first three symbols, and the available PDSCH is occupied.
  • the frequency position of the DC subcarrier is the highest subcarrier in RB#6.
  • the pattern of the DMRS is given in Figure 6, and the cyclic prefix is the normal cyclic prefix.
  • the left picture in Figure 6 is the RE occupied by port 7, 8, 11, and 13.
  • the right picture shows the RE occupied by port 9, 10, 12, and 14.
  • the maximum number of RBs corresponding to the narrowband bandwidth supported by the narrowband UE is N RB
  • the narrowband of the narrowband UE is N RB RBs
  • the N RB RBs are renumbered to 0, 1 in the order of increasing frequency in the narrowband. 2
  • ... N RB -1 assuming that there is no PRS and CSI-RS in the narrow band, the system bandwidth is 20M, and each N RB RBs is a narrow band of narrow-band UE operation.
  • the DMRS port used by the eNB includes only one or more of the ports 7, 8, 11, and 13, when the N RB is even, the lowest frequency subcarrier of the RB numbered N RB /2 is selected as the DC subcarrier. If N RB is odd, then the selection number is The sixth subcarrier of the frequency in the RB from low to high is used as the DC subcarrier.
  • the DMRS port adopted by the eNB includes only one or more of prt9, 10, 12, and 14, when the N RB is even, the subcarrier with the highest frequency among the RBs numbered N RB / 2-1 is selected as the DC sub-carrier.
  • the selection number is N.
  • the RB /2-1 RB has a frequency from low to high, the 10th subcarrier is used as a DC subcarrier, or the RB numbered N RB /2 is selected from the lowest to the third frequency as a DC subcarrier. If N RB is odd, then the selection number is The 5th subcarrier or the 8th subcarrier of the frequency in the RB from low to high is used as the DC subcarrier.
  • FIG. 7 is an example of a DC subcarrier position of an MBSFN subframe.
  • the maximum number of RBs occupied by the narrowband of the narrowband UE is 6, which is RB#4 to RB#9 in the shaded portion of FIG.
  • the DMRS port adopted by the eNB only includes port7. It is assumed that the PDCCH occupies the first three symbols, the available PDSCH occupies 11 symbols after the fourth symbol, and the DC subcarrier exists only in the following 11 symbols.
  • the frequency position of the DC subcarrier is the lowest subcarrier in RB#7.
  • Figure 8 is a schematic diagram of the location of a non-MBSFN subframe DC subcarrier.
  • the cell ID mod 3 0, the maximum number of RBs occupied by the narrowband of the narrowband UE is 6, and the number of RBs pre-configured by the system for the narrowband UE is 7, which is the RB#4 to RB#9 of the oblique line in FIG.
  • the DC subcarrier exists only in the next 11 data symbols.
  • the frequency position of the DC subcarrier is the sixth subcarrier of the frequency from low to high in RB#7.
  • Fig. 9 is an example in which the DC subcarrier position is an integer multiple of 300 kHz.
  • the DC subcarrier position of the system bandwidth is an integer multiple of 300 KHz, and the DC corresponding to the narrowband UE is different from the DC of the system bandwidth by 10 RBs, that is, 120 subcarriers, that is, 6000 KHz, which is also an integral multiple of 300 KHz.
  • the narrowband UE can find the DC subcarrier by sweeping and receive the synchronization signal, MIB and/or SIB.
  • RBs are defined in the following ways:
  • Re-routing the RB according to the position of the DC subcarrier within the narrowband may be different from the RB definition of the system.
  • the shaded portion is a narrow band for narrowband UE operation
  • the thick line frame indicates the definition of the RB of the narrowband UE in the narrowband
  • the thin line frame indicates the definition of the RB of the system, which are not the same.
  • the way information is mapped to physical resources can be one of the following:
  • the number of subcarriers of RB#6 can be regarded as 11.
  • the eNB determines the location of the DC subcarriers in a preset manner (or a predefined manner) and then maps the information to physical resources for transmission.
  • the UE determines the location of the DC subcarrier according to a preset manner or a manner notified by the eNB, and then adjusts the RF center frequency to the position of the DC subcarrier, performs downlink signal reception, and completes demapping of the downlink signal.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the PDSCH of the UE is scheduled to be in a position by using the control information, and the RB included in the PDSCH is no longer limited to a pre-configured narrowband.
  • the DC subcarrier can schedule the RB of the PDSCH of the UE according to the eNB. Preset or pre-define the location of the DC subcarriers. Obtaining the position of the DC subcarrier according to a preset or predefined manner may be determined according to any of the following rules:
  • Rule 2 The RB in which the PDSCH of the UE is scheduled is regarded as a number of RBs in a narrowband according to a certain rule, and the location of the DC subcarrier is determined according to the method in Embodiment 1. RB lowest frequency of the narrowband assumption UE scheduled to RB # n, then the RB # n to the narrow band RB # n + N RB number RB N RB -1 between narrowband system as UE preconfigured. The location of the DC subcarriers is then defined in the manner described in the first embodiment. For example, the control channel schedules a narrowband UE to receive the PDSCH on the three RBs of RB#17, 18, and 21.
  • the RB of the maximum bandwidth supported by the narrowband UE is 6, and then the DC sub-determination is determined according to the first embodiment in RB#17-22.
  • the location of the carrier Alternatively, the N RB to RB # n th RB between RB # n'-N RB +1 as a narrow band narrowband eNB UE preconfigured, and the manner of the first embodiment to define the location of the DC subcarrier, The practical application is not limited to such a method.
  • the RB where the DC subcarrier is located is defined as one of the scheduled RBs, and the DC subcarrier is one of the available DC subcarriers closest to the center of the highest frequency RB to the highest RB.
  • the practical application is not limited to the above method.
  • the available DC subcarriers are predefined or preset sets of one or more of the following conditions or subcarriers in the subset of the set:
  • the DC subcarrier position is determined by the cell ID of the cell.
  • the DC subcarrier position is determined by the eNB for the reference signal used by the UE.
  • the UE-specific reference signal herein refers to the reference signal transmitted on port 5.
  • the UE-specific reference signal herein refers to the reference signal transmitted on port 5.
  • the DC subcarriers should also satisfy:
  • the DC subcarrier is on a subcarrier other than the subcarrier where the CSI-RS is located.
  • the available DC subcarriers are only present on the symbol on which the available PDSCH is located.
  • the subcarriers in the set of available subcarriers are related to system bandwidth.
  • a system with a system bandwidth of 5M has 15 available subcarriers
  • a system with a system bandwidth of 10M has 30 available subcarriers.
  • the available subcarriers may be subcarriers distributed according to a certain rule, such as equally spaced subcarriers.
  • the DC subcarrier at this time is the available narrowband DC subcarrier, and the narrowband DC subcarrier may be according to The manner in the first embodiment is predefined. For example, if the pre-configured narrowband of the system is RB#4-9, RB#10-16, etc., when the PDSCH of the UE scheduled by the eNB is RB4, 5, and 6, the DC is the DC of the narrowband RB#4-9.
  • the DC subcarrier corresponding to the control channel of the narrowband UE and the DC subcarrier corresponding to the traffic channel of the UE do not coincide. As shown in Figure 11.
  • the eNB after determining the DC subcarrier position, notifies the neighboring cell eNB of the DC subcarrier position, so as to prevent the neighboring cell eNB from transmitting too much power at the DC subcarrier position of the cell. Interference.
  • the way information is mapped to physical resources can be one of the following:
  • the eNB determines the location of the DC subcarriers in a preset manner, and then maps the information to physical resources for transmission.
  • the UE determines the DC position according to a predefined or preset manner, or is notified by the eNB, and then adjusts the RF center frequency to the position of the DC subcarrier, performs downlink signal reception, and completes demapping of the downlink signal.
  • FIG. 1 An example of determining the DC subcarrier position in accordance with rule 3 above is given in FIG.
  • the control information is on the 6 RBs of the slash portion, and the PDSCH of the scheduled narrowband UE is in the dotted portion, and the position of the DC subcarrier is as shown in FIG.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the location of the DC subcarrier can also be notified through the control channel.
  • the location information of the DC subcarriers may be included in the control information so that multiple UEs can share one DC subcarrier.
  • the DC subcarrier position information in the control information may be an index number of a DC subcarrier.
  • the system pre-defines the available DC sub-carriers in the entire bandwidth, which is the same as the available sub-carriers in the second embodiment, and is not described here.
  • the index number of the DC subcarrier may be indicated in the control information, and the indication information may be an absolute value, for example, if there are 2 available DC subcarrier positions in one RB, and a total of 200 available DC subcarriers are assumed in the 20M system. Location, then adopt Bits indicate the DC subcarrier position.
  • the indication information may also be a relative value. For example, if there are 2 available DC subcarrier positions in one RB, and the number of RBs allocated to the UE is at most 6, then the available DC subcarrier positions are a total of 12, then adopt Bit to indicate the location of the DC subcarrier. The latter method saves more bits.
  • Figure 13 is an example in which the indication information in the control information is a relative value, wherein the control information On the 6 RBs of the slash portion, the PDSCH of the scheduled narrowband UE is in the dotted portion, indicating "001" in the control information, indicating that the DC subcarrier is counting from the RB of the lowest frequency, and the second available DC sub At the carrier position.
  • the practical application is not limited to the above method.
  • the DC subcarrier at this time is the available narrowband DC subcarrier, and the narrowband DC subcarrier may be according to The manner in the first embodiment is predefined.
  • the eNB after determining the DC subcarrier location, notifies the neighboring cell eNB of the DC location, so as to prevent the neighboring cell eNB from transmitting too much power at the DC subcarrier location of the cell, causing interference.
  • the way information is mapped to physical resources can be one of the following:
  • the eNB determines the DC location in a predefined or preset manner and then maps the information to physical resources for transmission.
  • the UE determines the DC subcarrier position according to a predefined or preset manner, or is notified by the eNB, and then adjusts the RF center frequency point to the DC subcarrier position, performs downlink signal reception, and completes demapping of the downlink signal.
  • the eNB side does not define the DC subcarrier position.
  • the DC subcarrier is located in the middle of the two subcarriers, and the impact of the local oscillator leakage is small.
  • the narrowband is 6 RBs and the narrowband UE receives the narrowband signal
  • the DC subcarrier is located at the center frequency position of the six RBs, that is, the RB with the lowest frequency is assumed to be the first RB, and so on, and the RB with the highest frequency is the sixth RB.
  • the DC subcarrier position is in the middle of the subcarrier of the highest frequency of the third RB and the subcarrier of the lowest frequency of the fourth RB.
  • the UE may also perform the receiving in the same manner as described above, for example, the scheduled RB is regarded as a narrowband or the scheduled RB is regarded as a narrowband RB according to the manner in the second embodiment, according to the foregoing.
  • the way to set the DC subcarriers in the middle of the two subcarriers in the narrow band is not limited to such a method.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.
  • the devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • each device/function module/functional unit in the above embodiment When each device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the embodiment of the present invention defines a DC location for a narrowband UE.
  • an eNB base station
  • the DC location is vacated or a predefined signal is sent at the DC location to avoid interference.

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Abstract

L'invention concerne un procédé et un dispositif d'envoi et de réception de signal de liaison descendante. Le procédé d'envoi consiste : selon une manière préétablie et/ou selon une manière indiquée par des informations de commande, à acquérir, par un nœud B évolué (eNB), l'emplacement d'une sous-porteuse à courant continu (CC); à mapper, par l'eNB, les informations à envoyer sur une ressource physique pour un envoi, lorsqu'il est sur la sous-porteuse à courant continu (CC), l'eNB n'envoyant pas de signal ou envoyant un signal prédéfini.
PCT/CN2015/086892 2014-10-17 2015-08-13 Procédé et dispositif d'envoi et de réception de signal de liaison descendante WO2016058444A1 (fr)

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CN201410555364.6 2014-10-17
CN201410555364.6A CN105577337A (zh) 2014-10-17 2014-10-17 一种下行信号的发送、接收方法及装置

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113015182A (zh) * 2019-12-20 2021-06-22 维沃移动通信有限公司 一种确定dc位置的方法、终端设备和网络设备
WO2022148313A1 (fr) * 2021-01-07 2022-07-14 维沃移动通信有限公司 Procédé de traitement de position de courant continu et dispositif associé
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