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WO2016155508A1 - 一种支持多用户叠加的ue、基站中的方法和设备 - Google Patents

一种支持多用户叠加的ue、基站中的方法和设备 Download PDF

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Publication number
WO2016155508A1
WO2016155508A1 PCT/CN2016/076611 CN2016076611W WO2016155508A1 WO 2016155508 A1 WO2016155508 A1 WO 2016155508A1 CN 2016076611 W CN2016076611 W CN 2016076611W WO 2016155508 A1 WO2016155508 A1 WO 2016155508A1
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signaling
wireless signal
dci format
time
user
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PCT/CN2016/076611
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English (en)
French (fr)
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张晓博
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上海朗帛通信技术有限公司
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Publication of WO2016155508A1 publication Critical patent/WO2016155508A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the present invention relates to a scheduling scheme in a wireless communication system, and more particularly to a method and apparatus for downlink scheduling for multi-user superposition based on LTE-Long Term Evolution.
  • the downlink wireless signals of multiple users are through ⁇ TDM (Time Division Multiplexing), FDM (Frequency Division Multiplexing). ), one or more of CDM (Code Division Multiplexing) is implemented.
  • a new research topic (RP-150496) is introduced in 3GPP R (Release, Release) 13, which is a downlink multi-user overlay, which essentially distinguishes the downlink wireless signals of two users by using different transmission powers.
  • the two users usually include a near user (ie, close to the base station) and a far user (ie, far from the base station), and the base station allocates a lower transmission power for the first signal for the near user, and is the first for the remote user.
  • the second signal distributes a higher transmit power.
  • the far user directly demodulates the second signal (that is, the first signal is treated as noise), and the near user first demodulates the second signal (taking into account that the near-user farther user has lower path loss, the probability of successful decoding is high. And then removing the influence of the second signal from the received signal to obtain a residual signal, and decoding the remaining signal to obtain a first signal, which is an SIC (Successive Interference Cancellation) algorithm.
  • SIC Successessive Interference Cancellation
  • a user obtains a PDSCH (Physical Downlink) according to DCI (Downlink Control Information) transmitted in a PDCCH (Physical Downlink Control Channel) or an EPDCCH (Enhanced PDCCH). Scheduling information of the Shared Channel, the physical downlink control channel.
  • DCI Payload Size the UE performs BD (Blind Decoding) to determine the corresponding PDCCH or EPDCCH. Therefore, the maximum number of BDs performed by the UE increases with the number of DCI load sizes that the UE needs to monitor.
  • the base station configures a TM (Transmission Mode) for the UE through high layer signaling. For each TM, the UE only needs to detect two DCI load sizes.
  • the base station adds extra bits to the scheduled DCI of the first signal (for the near user) that is used to carry information related to the second signal.
  • the UE should be able to dynamically switch between multi-user superposition state and non-multi-user superposition state, and multi-user superimposed UE pairing can be dynamically scheduled. Therefore, the above intuitive method may face the following problems:
  • the load size of the scheduled DCI of the first signal may be up to 4 types - 2 types of multi-user superimposed state and non-multi-user superimposed state, so the maximum number of BDs supported by the UE is doubled, increasing UE complexity
  • the load size of the scheduled DCI of the first signal may be relatively large - the sum of the number of information bits required to assist in demodulating the second signal plus the number of scheduling information bits of the first signal is approximately equivalent to 2
  • the load size of a traditional DCI means a reduction in transmission efficiency.
  • the present invention provides a solution. It should be noted that, in the case of no conflict, the features in the embodiments and embodiments in the UE of the present application can be applied to the base station, and vice versa. Further, the features of the embodiments and the embodiments of the present application may be combined with each other arbitrarily without conflict.
  • the invention discloses a method in a UE supporting multi-user superposition, which comprises the following steps:
  • Step A Receive first signaling, the first signaling indicating auxiliary information of the second signaling, the auxiliary information comprising at least one of ⁇ time-frequency location, signaling format ⁇
  • Step B Receive second signaling according to the auxiliary information of the second signaling, and determine an association identifier of the second signaling according to the second signaling.
  • the first signaling and the second signaling are physical layer signaling, and the first wireless signal is scheduled by the first signaling, and the time-frequency resource occupied by the first wireless signal and the second wireless signal are occupied by the second wireless signal.
  • the time-frequency resources are all or partially overlapping, and the second wireless signal is scheduled by the second signaling.
  • the association identifier of the second signaling is not included in the first signaling.
  • the first aspect of the above aspect is that the first signaling indicates the related information of the second signaling and does not indicate the related information of the second wireless signal, so as to reduce the load size of the first signaling, while supporting the first wireless signal and the second wireless Relatively independent scheduling of signals.
  • the above essence violates the common scheme in the existing cellular network, because one of the multiple physical layer signaling cannot be correctly received, which may result in the UE being unable to receive the downlink wireless signal.
  • the inventors have found through research that the above-mentioned common knowledge is no longer valid in a multi-user overlay scenario because the probability that a near user correctly receives a given DCI for a far user is greater than the probability that a far user correctly receives the given DCI.
  • the second aspect of the foregoing aspect is that the first signaling does not include the association identifier of the second signaling (the association identifier in the LTE includes 16 bits), thereby further reducing the load size of the first signaling.
  • the above-mentioned essence 2 violates the common scheme of LTE, because the UE must first determine the association identifier of the physical layer signaling, and then can determine the CRC of the physical layer signaling, the search space and other related information.
  • the association information can be indicated by the auxiliary information in the first signaling - on the one hand, the load size of the first signaling is reduced, and on the other hand, the number of BDs is reduced.
  • the signaling identifier is used to determine a ⁇ CRC (Cyclic Redundancy Check) scrambling code corresponding to physical layer signaling, a PDCCH UE-specific search space, and an EPDCCH UE-specific search space.
  • ⁇ CRC Cyclic Redundancy Check
  • the first wireless signal and the second wireless signal are transmitted on the PDSCH.
  • the signaling identifier is an RNTI (Radio Network Temporary Identity).
  • RNTI Radio Network Temporary Identity
  • the signaling identifier is C (Cell)-RNTI.
  • the UE determines the PDCCH or EPDCCH occupied by the DCI through the BD.
  • the excessive number of BDs may increase the false alarm probability, and the time-frequency location and the signaling indication in the auxiliary information can reduce the number of BDs performed by the UE for the second signaling.
  • the signaling format includes: ⁇ including a CIF (Carrier Indicator Field), whether to include one or more of a SRS (Sounding Reference Signal) request, a DCI format, and a TM ⁇ One.
  • CIF Carrier Indicator Field
  • SRS Sounding Reference Signal
  • the second signaling transmits the association identifier on the EPDCCH for determining a DMRS sequence of the second signaling.
  • the first signaling and the second signaling are both Transmitted on the EPDCCH, the first signaling and the second signaling share the same dmrs-ScramblingSequenceInt.
  • the UE determines an association identifier of the second signaling according to the CRC of the second signaling.
  • the specific implementation method is as follows: first, the CRC before the scrambling of the second signaling is determined according to the information bits of the second signaling, and then the CRC is used to receive the CRC before the scrambling The scrambled CRC of the second signaling to the scramble operation obtains the association identifier of the second signaling.
  • the target receiver of the first signaling is the UE (ie, identified by the RNTI of the UE), and the target receiver of the second signaling is a terminal other than the UE.
  • step C further includes the following steps:
  • Step C1 The UE first demodulates the second wireless signal and then removes the influence of the second wireless signal from the received signal (ie, subtracts the component of the second wireless signal from the received signal).
  • step C of the foregoing method further includes the following steps:
  • Step C2. Pass the first wireless signal to the upper layer and discard the second wireless signal.
  • the first wireless signal and the second wireless signal occupy the same frequency domain resource.
  • information bits for configuring frequency domain resources are not included in the first signaling (the saved information bits can be used to indicate the auxiliary information).
  • the first signaling includes a flag bit, where the flag bit is used to indicate that the DCI format of the physical layer signaling to which the flag bit belongs is ⁇ first DCI format, second DCI format One of the ⁇ .
  • the first DCI format is used to schedule downlink transmissions that are not multi-user overlays
  • the second DCI format is used to schedule downlink transmissions of multi-user overlays.
  • the flag bit in the first signaling indicates that the first signaling belongs to the second DCI format.
  • the first DCI format is one of DCI formats ⁇ 1, 1A, 1B, 1D, 2, 2A ⁇ , and the first wireless signal is transmitted by the CRS antenna port.
  • the first DCI format is one of DCI formats ⁇ 2B, 2C, 2D ⁇ , and the first wireless signal is sent by a DMRS (Demodulation Reference Signal) antenna port.
  • DMRS Demodulation Reference Signal
  • the first DCI format and the second DCI format have the same load size
  • the second DCI format includes all the information bits except the information bits for configuring the frequency domain resource in the first DCI format or Part of the information bits.
  • the second DCI format includes all of the information bits in the first DCI format except for the information bits used to configure the frequency domain resources and the information bits used to configure the DMRS parameters.
  • the second DCI format includes at least one of ⁇ transmit power of the second wireless signal, DMRS parameter of the second signaling ⁇ .
  • the UE Since the second signaling is not for the UE, the UE needs to obtain the auxiliary information before receiving the second signaling. Further, for the PDCCH and the EPDCCH, the additional information required by the UE may be different.
  • the following two aspects of the present invention provide solutions for EPDCCH and PDCCH, respectively.
  • the step A further includes the following steps:
  • Step A Receive the first higher layer signaling to determine K3 EPDCCH-PRB-sets.
  • the second signaling is transmitted on the EPDCCH in the K3 EPDCCH-PRB-set, where the K3 is a positive integer, and the time-frequency position indicates an EPDCCH occupied by the second signaling.
  • the time-frequency location includes a first part and a second part, where the first part indicates an Aggregation Level of the second signaling, and the second part indicates a starting eCCE of the second signaling (enhanced Control Channel) Element, an enhanced control channel element), the starting eCCE being one of the K3 EPDCCH-PRB-sets.
  • the time-frequency location includes a third portion, and the third portion indicates whether the second signaling is transmitted on the PDCCH or on the EPDCCH.
  • the time-frequency position indicates a PDCCH occupied by the second signaling.
  • the second signaling is transmitted on the PDCCH.
  • the time-frequency location indicates a degree of aggregation of the second signaling and a starting CCE of the second signaling.
  • the invention discloses a method in a base station supporting multi-user superposition, which comprises the following steps:
  • Step A transmitting first signaling, the first signaling indicating auxiliary information of the second signaling, the auxiliary information comprising at least one of ⁇ time-frequency location, signaling format ⁇
  • Step B Sending the second signaling according to the association identifier of the second signaling
  • Step C Transmitting the first wireless signal and the second wireless signal.
  • the first signaling and the second signaling are physical layer signaling, and the first wireless signal is scheduled by the first signaling, and the time-frequency resource occupied by the first wireless signal and the time-frequency occupied by the second wireless signal are used.
  • the resources are all or partially overlapping, and the second wireless signal is scheduled by the second signaling.
  • the first wireless signal and the second wireless signal occupy the same frequency domain resource.
  • Information bits for configuring frequency domain resources are not included in the first signaling.
  • the first signaling includes a flag bit, where the flag bit is used to indicate that the DCI format of the physical layer signaling to which the flag bit belongs is ⁇ first DCI format, second DCI format One of the ⁇ .
  • the first DCI format is used to schedule downlink transmissions that are not multi-user overlays
  • the second DCI format is used to schedule downlink transmissions of multi-user overlays.
  • the first DCI format and the second DCI format have the same load size
  • the second DCI format includes all the information bits except the information bits for configuring the frequency domain resource in the first DCI format or Part of the information bits.
  • the step A further includes the following steps:
  • Step A1 Sending the first higher layer signaling indicates K3 EPDCCH-PRB-sets.
  • the second signaling is transmitted on the EPDCCH in the K3 EPDCCH-PRB-set, where the K3 is a positive integer, and the time-frequency position indicates an EPDCCH occupied by the second signaling.
  • the time-frequency position indication :
  • the second location The index of the EPDCCH occupied by the second signaling in the target EPDCCH set.
  • the target EPDCCH set includes all EPDCCH candidates (Candidates) in the EPDCCH-PRB-set to which the second signaling belongs, determined by the association identifier of the second signaling.
  • the signaling identifier is a C-RNTI
  • the eCCE occupied by the EPDCCH candidate in the target EPDCCH set is mapped by the association identifier of the second signaling according to a Harsh function, and the specific reference is performed. Section 9.1.4 of TS36.213.
  • the first higher layer signaling is RRC (Radio Resource Control) signaling.
  • the K3 EPDCCH-PRB-sets are subframe-specific (that is, the first high-level signaling is only valid for the current subframe), or the subframe set is specific (that is, the first high-level signaling is only A specific set of subframes is valid).
  • the time-frequency location further indicates whether the EPDCCH occupied by the corresponding physical layer signaling (ie, the second signaling) is distributed or localized.
  • the K3 is greater than two.
  • the K3 EPDCCH-PRB-sets share the same EPDCCH resource mapping parameter, the EPDCCH resource mapping parameter indicating an RE that should perform rate matching (to avoid occupation) when mapping EPDCCH RE (Resource Element).
  • the EPDCCH resource mapping parameter includes ⁇ pdsch-Start-r11, crs-PortsCount-r11, crs-PortsCount-r11, csi-RS-ConfigZPId-r11 ⁇ .
  • the time-frequency position indicates a PDCCH occupied by the second signaling.
  • the second signaling is transmitted on the PDCCH.
  • the invention discloses a user equipment supporting multi-user overlay, wherein the following modules are included:
  • a first module configured to receive first signaling, where the first signaling indicates auxiliary information of the second signaling, where the auxiliary information includes at least one of ⁇ time-frequency location, signaling format ⁇
  • the second module is configured to receive the second signaling according to the auxiliary information of the second signaling, and determine the association identifier of the second signaling according to the second signaling.
  • the third module is configured to receive the first wireless signal
  • the first signaling and the second signaling are physical layer signaling, and the first wireless signal is scheduled by the first signaling, and the time-frequency resource occupied by the first wireless signal and the time-frequency occupied by the second wireless signal are used.
  • the resources are all or partially overlapping, and the second wireless signal is scheduled by the second signaling.
  • the invention discloses a base station device supporting multi-user superposition, wherein the following modules are included:
  • a first module configured to send first signaling, where the first signaling indicates auxiliary information of the second signaling, where the auxiliary information includes at least one of ⁇ time-frequency location, signaling format ⁇
  • a second module configured to send the second signaling according to the association identifier of the second signaling
  • the third module is configured to send the first wireless signal and the second wireless signal.
  • the first signaling and the second signaling are physical layer signaling, and the first wireless signal is scheduled by the first signaling, and the time-frequency resource occupied by the first wireless signal and the time-frequency occupied by the second wireless signal are used.
  • the resources are all or partially overlapping, and the second wireless signal is scheduled by the second signaling.
  • the present invention has the following technical advantages:
  • FIG. 1 shows a flow chart of scheduling of downlink multi-user overlays in accordance with one embodiment of the present invention
  • Figure 2 shows a schematic diagram of auxiliary information in accordance with one embodiment of the present invention
  • Figure 3 shows a schematic diagram of a time-frequency location in accordance with one embodiment of the present invention
  • FIG. 4 is a block diagram showing the structure of a processing device in a UE according to an embodiment of the present invention.
  • FIG. 5 is a block diagram showing the structure of a processing device in a base station according to an embodiment of the present invention.
  • Embodiment 1 illustrates a scheduling flowchart of downlink multi-user overlay, as shown in FIG.
  • base station N1 is a maintenance base station for the serving cells of UE U2 and UE U3, wherein the steps in block F1 are optional steps.
  • the first signaling is sent in step S11, and the first signaling indicates auxiliary information of the second signaling, the auxiliary information including at least one of ⁇ time-frequency location, signaling format ⁇ .
  • the second signaling is sent according to the association identifier of the second signaling in step S12.
  • the first wireless signal and the second wireless signal are transmitted in step S13.
  • the first signaling is received in step S21.
  • the second signaling is received according to the auxiliary information of the second signaling, and the association identifier of the second signaling is determined according to the second signaling.
  • the first wireless signal is obtained after receiving the second wireless signal in step S23 and canceling the interference caused by the second wireless signal.
  • the first signaling is received in step S31.
  • the second wireless signal is received in step S32.
  • the first signaling and the second signaling are physical layer signaling, and the first wireless signal
  • the time-frequency resource occupied by the first wireless signal and the time-frequency resource occupied by the second wireless signal are all or partially overlapped, and the second wireless signal is scheduled by the second signaling.
  • the association identifier of the first signaling is configured to the UE U2
  • the association identifier of the second signaling is configured to the UE U3.
  • the association identifier is an RNTI.
  • the first radio signal and the second radio signal occupy the same frequency domain resource, and the information bits for frequency domain resource allocation are not included in the first signaling (ie, the UE U2 is based on the second letter).
  • the information bits used for frequency domain resource allocation are used to determine the frequency domain resources occupied by the first wireless signal.
  • the first signaling includes a 1-bit flag, where the flag is used to indicate that the first signaling is the second of the ⁇ first DCI format, the second DCI format ⁇ DCI format.
  • the first DCI format is used to schedule downlink transmissions that are not multi-user overlays, and the second DCI format is used to schedule downlink transmissions of multi-user overlays.
  • the second DCI format includes all or part of the information bits in the first DCI format except for the information bits used to configure the frequency domain resources.
  • the first DCI format and the second DCI format in the sub-embodiment 3 of the embodiment 1 have the same load size.
  • the base station N1 transmits the first high layer signaling indication K3 EPDCCH-PRB-sets in step S10.
  • the UE U2 receives the first higher layer signaling in step S20 to determine the K3 EPDCCH-PRB-sets.
  • the second signaling is transmitted on the EPDCCH in the K3 EPDCCH-PRB-set, where the K3 is a positive integer, and the time-frequency position indicates an EPDCCH occupied by the second signaling.
  • the UE U2 determines the association identifier of the second signaling by using the following operation in step S22:
  • Decoding the second signaling obtaining the information bits of the second signaling and the scrambling CRC, and calculating the CRC before the scrambling code of the second signaling according to the information bits of the second signaling, to the second
  • the CRC before the scrambling of the signaling and the CRC after the scrambling are XORed to obtain the associated identifier of the second signaling.
  • Embodiment 2 exemplifies a schematic diagram of auxiliary information, as shown in FIG. 2, in which the time-frequency position identified by the arrows R1, R3 and the signaling format of the R2 identification are optional. It should be noted that FIG. 2 only describes the content of the auxiliary information, wherein the order of the information is not limited to the actual position in the first signaling.
  • the auxiliary information includes ⁇ flag bit, time-frequency position, signaling format ⁇ , which are respectively mapped to ⁇ first domain, second domain, third domain ⁇ in the first signaling.
  • the flag bit includes 1 bit, and is used to indicate whether the first signaling is a first DCI format or a second DCI format, where the first DCI format is used for scheduling downlink transmission of non-multiple user superposition, and the second DCI format is used for Scheduling the downlink transmission of multi-user overlays.
  • the time-frequency position includes a distribution mode, a degree of aggregation, and a position of a starting eCCE, wherein the distribution mode includes 1 bit for indicating Whether the EPDCCH occupied by the second signaling is distributed or centralized.
  • the location of the initial eCCE is the first eCCE occupied by the second signaling (corresponding to the degree of aggregation of the second signaling), all possible as the first The index in the candidate eCCE set of eCCEs.
  • the time-frequency position includes a degree of polymerization, and the position of the starting CCE is composed of three parts.
  • the signaling format includes three parts:
  • the auxiliary information further includes other information corresponding to the fourth domain in the first signaling, where the other information includes at least one of the following:
  • Embodiment 3 illustrates a schematic diagram of the time-frequency position, as shown in FIG.
  • a small square is a CCE or an eCCE, wherein the small square identified by the slanting line is the starting CCE occupied by the second signaling or the candidate position of the starting eCCE - the degree of aggregation of the second signaling is 4.
  • the time-frequency position in the present invention indicates the degree of aggregation of the second signaling and one of the following:
  • the EPDCCH-PRB-set to which the second signaling belongs is the index in the K3 EPDCCH-PRB-sets in the present invention, and the initial eCCE occupied by the second signaling is in the EPDCCH to which the second signaling belongs.
  • - Index of all possible candidate eCCEs in PRB-set (such as small squares identified by slashes, #0, #4, #8, #16, ).
  • Embodiment 4 exemplifies a structural block diagram of a processing device in one UE, as shown in FIG.
  • the UE processing apparatus 200 is mainly composed of a first receiving module 201, a second receiving module 202, and a third receiving module 203.
  • the first receiving module 201 is configured to receive first signaling, where the first signaling indicates auxiliary information of the second signaling, where the auxiliary information includes at least one of ⁇ time-frequency location, signaling format ⁇ .
  • the second receiving module 202 is configured to receive the second signaling according to the auxiliary information of the second signaling, and determine the association identifier of the second signaling according to the second signaling.
  • the third receiving module 203 is configured to receive the first wireless signal.
  • the first signaling and the second signaling are physical layer signaling, and the first wireless signal is scheduled by the first signaling, and the time-frequency resource and the second wireless signal occupied by the first wireless signal are occupied by The time-frequency resources are all or partially overlapping, and the second wireless signal is scheduled by the second signaling.
  • the association identifier is an RNTI.
  • the first receiving module 201 is further configured to receive RRC signaling to determine K3 EPDCCH-PRB-sets.
  • the second signaling is transmitted on the EPDCCH in the K3 EPDCCH-PRB-sets, where the K3 is a positive integer, and the time-frequency location includes an EPDCCH indicating that the second signaling is occupied.
  • the first signaling includes a flag bit, where the flag bit is used to indicate that the DCI format of the physical layer signaling to which the flag bit belongs is ⁇ first DCI format, second DCI format One of the ⁇ .
  • the first DCI format is used to schedule downlink transmissions that are not multi-user overlays
  • the second DCI format is used to schedule downlink transmissions of multi-user overlays.
  • Embodiment 5 exemplifies a structural block diagram of a processing device in a base station, as shown in FIG.
  • the base station processing apparatus 300 is mainly composed of a first sending module 301, a second sending module 302, and a third transmitting module 303.
  • the first sending module 301 is configured to send first signaling, where the first signaling indicates auxiliary information of the second signaling, where the auxiliary information includes at least one of ⁇ time-frequency location, signaling format ⁇ .
  • the second sending module 302 is configured to send the second signaling according to the association identifier of the second signaling.
  • the third sending module 303 is configured to send the first wireless signal and the second wireless signal.
  • the first signaling and the second signaling are physical layer signaling, the first wireless signal is scheduled by the first signaling, and the second wireless signal is scheduled by the second signaling.
  • the first wireless signal and the second wireless signal are transmitted on the PDSCH, and the first wireless signal and the second wireless signal occupy the same PRB (Physical Resource Block) pair (Pair).
  • PRB Physical Resource Block
  • the time-frequency position indicates a PDCCH occupied by the second signaling.
  • the second signaling is transmitted on the PDCCH.
  • each module unit in the above embodiment may be implemented in hardware form or in the form of a software function module.
  • the application is not limited to any specific combination of software and hardware.
  • the UE in the present invention includes, but is not limited to, a wireless communication device such as a mobile phone, a tablet computer, a notebook, and an internet card.
  • the base station in the present invention includes, but is not limited to, a macro communication base station, a micro cell base station, a home base station, a relay base station, and the like.

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Abstract

本发明公开了一种支持多用户叠加的UE、基站中的方法和设备。UE在步骤一中接收第一信令，第一信令指示第二信令的辅助信息,所述辅助信息包括{时频位置，信令格式}中的至少一种。在步骤二中根据第二信令的辅助信息接收第二信令，根据第二信令确定第二信令的关联标识。在步骤三中接收第一无线信号。其中，第一信令和第二信令都是物理层信令，第一无线信号由第一信令所调度，第一无线信号所占用的时频资源和第二无线信号所占用的时频资源全部或者部分重叠，第二无线信号由第二信令所调度。本发明减少针对近UE的调度信令的负载尺寸，同时支持叠加的无线信号之间相对独立的调度。此外，本发明避免了过多的BD次数导致的虚警增加，降低了UE的复杂度。

Description

一种支持多用户叠加的UE、基站中的方法和设备 技术领域
本发明涉及无线通信系统中的调度方案，特别是涉及基于长期演进(LTE-Long Term Evolution)的针对多用户叠加(Superposition)的下行调度的方法和装置。
背景技术
传统的3GPP(3rd Generation Partner Project，第三代合作伙伴项目)蜂窝系统中，多用户的下行无线信号是通过{TDM(Time Division Multiplexing，时分复用)，FDM(Frequency Division Multiplexing，频分复用)，CDM(Code Division Multiplexing，码分复用)}中的一种或者多种方式来实现。3GPP R(Release，版本)13中引入了一个新的研究课题(RP-150496)，即下行多用户叠加，其本质是利用发送功率的不同区分两个用户的下行无线信号。所述两个用户通常包括一个近用户(即距离基站近)和一个远用户(即距离基站远)，基站为针对近用户的第一信号分配较低的发送功率，同时为针对远用户的第二信号分配较高的发送功率。远用户直接解调第二信号(即将第一信号当噪声处理)，而近用户首先解调第二信号(考虑到近用户较远用户具备更低的路径损耗，译码成功的可能性很高)，然后从接收信号中去除第二信号的影响得到剩余信号，对剩余信号译码获得第一信号，这就是SIC(Successive Interference Cancellation，连续干扰消除)算法。为了执行SIC，近用户需要获得第一信号和第二信号的调度信息-而远用户只需要获得第二信号的调度信息。
传统的LTE动态调度中，用户根据在PDCCH(Physical Downlink Control Channel，物理下行控制信道)或者EPDCCH(Enhanced PDCCH，增强的PDCCH)中传输的DCI(Downlink Control Information，下行控制信息)获得PDSCH(Physical Downlink Shared Channel，物理下行控制信道)的调度信息。对于一种DCI负载尺寸(Payload Size)，UE执行BD(Blind Decoding，盲译码)以确定相应的PDCCH或者EPDCCH。因此，UE最多执行的BD次数随着UE所需要监测的DCI负载尺寸数而增 加，为了降低过多的BD次数导致的UE复杂度的增加，基站通过高层信令为UE配置TM(Transmission Mode，传输模式)，对于每一种TM，UE仅需检测两种DCI负载尺寸。
对于多用户叠加，一个直观的想法是基站在(针对近用户的)第一信号的调度DCI中增添额外的比特，所述额外的比特用于承载和第二信号相关的信息。
发明内容
发明人通过研究发现，为了获得调度增益，UE应当能在多用户叠加状态和非多用户叠加状态动态切换，并且多用户叠加的UE配对是能够动态调度的。因此，上述直观的方法可能会面临如下问题：
-.对于给定TM，第一信号的调度DCI的负载尺寸可能多达4种-多用户叠加状态和非多用户叠加状态各2种，因此UE所支持的最大BD次数提高了一倍，增加了UE的复杂度
-.多用户叠加状态下，第一信号的调度DCI的负载尺寸可能会比较大–辅助解调第二信号所需的信息比特数加上第一信号的调度信息比特数的总和大约相当于2个传统DCI的负载尺寸。较大的DCI负载尺寸意味着传输效率的降低。
针对上述问题，本发明提供了解决方案。需要说明的是，在不冲突的情况下，本申请的UE中的实施例和实施例中的特征可以应用到基站中，反之亦然。进一步的，在不冲突的情况下，本申请的实施例和实施例中的特征可以任意相互组合。
本发明公开了一种支持多用户叠加的UE中的方法，其中,包括如下步骤：
-步骤A.接收第一信令，第一信令指示第二信令的辅助信息,所述辅助信息包括{时频位置，信令格式}中的至少一种
-步骤B.根据第二信令的辅助信息接收第二信令，根据第二信令确定第二信令的关联标识。
-步骤C.接收第一无线信号
其中，第一信令和第二信令都是物理层信令，第一无线信号由第一信令所调度，第一无线信号所占用的时频资源和第二无线信号所占用的 时频资源全部或者部分重叠，第二无线信号由第二信令所调度。
第一信令中不包括第二信令的关联标识。
上述方面的本质一是：第一信令指示第二信令的相关信息而不指示第二无线信号的相关信息，以减少第一信令的负载尺寸，同时支持第一无线信号和第二无线信号相对独立的调度。上述本质一违背了现有蜂窝网中的常用方案，因为所述多个物理层信令中有1个不能正确接收就会导致UE无法接收下行无线信号。发明人通过研究发现，上述公知常识在多用户叠加场景中不再成立，因为近用户正确接收针对远用户的给定DCI的概率要大于远用户正确接收所述给定DCI的概率。
上述方面的本质二是：第一信令中不包括第二信令的关联标识(LTE中的关联标识包括16个比特)，进而进一步降低第一信令的负载尺寸。上述本质二违背了LTE的常用方案，因为UE必须先要确定物理层信令的关联标识，然后才能确定物理层信令的CRC，搜索空间等关联信息。而本发明中，所述关联信息能够通过第一信令中的所述辅助信息指示–一方面降低了第一信令的负载尺寸，另一方面减少了BD次数。
作为一个实施例，所述信令标识用于确定对应物理层信令的{CRC(Cyclic Redundancy Check，循环冗余校验)扰码，PDCCH UE特定的搜索空间，EPDCCH UE特定的搜索空间}中的一种或者多种。
作为一个实施例，第一无线信号和第二无线信号在PDSCH上传输。
作为一个实施例，所述信令标识是RNTI(Radio Network Temporary Identity，无线网络暂定标识)。
作为一个实施例，所述信令标识是C(Cell，小区)-RNTI。
传统的LTE中，UE(针对每一种可能的负载尺寸)通过BD确定DCI所占用的PDCCH或者EPDCCH。而过多的BD次数可能会增加虚警概率，而所述辅助信息中的所述时频位置和所述信令格示能减少UE针对第二信令所执行的BD次数。
作为一个实施例，所述信令格式包括{是否包括CIF(Carrier Indicator Field，载波指示域)，是否包括SRS(Sounding Reference Signal，侦听参考信号)请求，DCI格式，TM}中的一个或者多个。
作为一个实施例，第二信令在EPDCCH上传输所述关联标识用于确定第二信令的DMRS序列。作为一个实施例，第一信令和第二信令都在 EPDCCH上传输，第一信令和第二信令共享相同的dmrs-ScramblingSequenceInt。
作为一个实施例，所述步骤B中，所述UE根据第二信令的CRC确定第二信令的关联标识。作为本实施例的一个子实施例，具体实现方法如下：首先根据第二信令的信息比特确定第二信令的加扰(Scrambling)前的CRC，然后利用所述加扰前的CRC对接收到的第二信令的加扰后的CRC进行扰码操作得到第二信令的关联标识。
作为一个实施例，第一信令的目标接收者是所述UE(即由所述UE的RNTI标识)，第二信令的目标接收者是所述UE之外的终端。
作为一个实施例，所述步骤C中还包括如下步骤：
-步骤C1.所述UE首先解调出第二无线信号，然后从接收信号中消除第二无线信号的影响(即从接收信号中减去第二无线信号的分量)。
作为一个实施例，上述方法的所述步骤C还包括如下步骤：
-步骤C2.将第一无线信号传递给高层，丢弃第二无线信号。
具体的，根据本发明的一个方面，第一无线信号和第二无线信号占用相同的频域资源。
作为一个实施例，第一信令中不包括用于配置频域资源的信息比特(节省的信息比特能够用于指示所述辅助信息)。
具体的，根据本发明的一个方面，第一信令中包括标志位，所述标志位用于指示所述标志位所属的物理层信令的DCI格式是{第一DCI格式，第二DCI格式}中的一种。其中，第一DCI格式用于调度非多用户叠加的下行传输，第二DCI格式用于调度多用户叠加的下行传输。
第一信令中的所述标志位指示第一信令属于第二DCI格式。作为一个实施例，第一DCI格式是DCI格式{1，1A，1B，1D，2，2A}中的一种，第一无线信号由CRS天线端口发送。作为一个实施例，第一DCI格式是DCI格式{2B，2C，2D}中的一种，第一无线信号由DMRS(Demodulation Reference Signal，解调参考信号)天线端口发送。
具体的，根据本发明的一个方面，第一DCI格式和第二DCI格式的负载尺寸相同，第二DCI格式中包含第一DCI格式中除去用于配置频域资源的信息比特之外的全部或者部分信息比特。
上述方面避免了所述UE因为多用户叠加而执行额外的BD操作。作 为一个实施例，第二DCI格式包含第一DCI格式中除去用于配置频域资源的信息比特和用于配置DMRS参数的信息比特之外的全部信息比特。作为一个实施例，第二DCI格式包含{第二无线信号的发送功率，第二信令的DMRS参数}中的至少一种。
由于第二信令不是针对所述UE的，所述UE需要获得所述辅助信息之后才能接收第二信令。进一步的，对于PDCCH和EPDCCH，所述UE所需要的额外的信息可能是不同的。本发明的下述两个方面分别针对EPDCCH和PDCCH提供解决方案。
具体的，根据本发明的一个方面，所述步骤A还包括如下步骤：
-步骤A1.接收第一高层信令确定K3个EPDCCH-PRB-set。
其中，第二信令在所述K3个EPDCCH-PRB-set中的EPDCCH上传输，所述K3是正整数，所述时频位置指示第二信令所占用的EPDCCH。
作为一个实施例，所述时频位置包括第一部分和第二部分，其中第一部分指示第二信令的聚合度(Aggregation Level)，第二部分指示第二信令的起始eCCE(enhanced Control Channel Element，增强的控制信道单元)，所述起始eCCE是所述K3个EPDCCH-PRB-set中的一个eCCE。
作为一个实施例，所述时频位置包括第三部分，第三部分指示第二信令是在PDCCH上还是在EPDCCH上传输。
具体的，根据本发明的一个方面，所述时频位置指示第二信令所占用的PDCCH。其中，第二信令在PDCCH上传输。
作为一个实施例，所述时频位置指示第二信令的聚合度和第二信令的起始CCE。
本发明公开了一种支持多用户叠加的基站中的方法，其中,包括如下步骤：
-步骤A.发送第一信令，第一信令指示第二信令的辅助信息,所述辅助信息包括{时频位置，信令格式}中的至少一种
-步骤B.根据第二信令的关联标识发送第二信令
-步骤C.发送第一无线信号和第二无线信号。
其中，第一信令和第二信令都是物理层信令，第一无线信号由第一信令所调度，第一无线信号所占用的时频资源和第二无线信号所占用的时频资源全部或者部分重叠，第二无线信号由第二信令所调度。
具体的，根据本发明的一个方面，第一无线信号和第二无线信号占用相同的频域资源。
第一信令中不包括用于配置频域资源的信息比特。
具体的，根据本发明的一个方面，第一信令中包括标志位，所述标志位用于指示所述标志位所属的物理层信令的DCI格式是{第一DCI格式，第二DCI格式}中的一种。其中，第一DCI格式用于调度非多用户叠加的下行传输，第二DCI格式用于调度多用户叠加的下行传输。
具体的，根据本发明的一个方面，第一DCI格式和第二DCI格式的负载尺寸相同，第二DCI格式中包含第一DCI格式中除去用于配置频域资源的信息比特之外的全部或者部分信息比特。
具体的，根据本发明的一个方面，所述步骤A还包括如下步骤：
-步骤A1.发送第一高层信令指示K3个EPDCCH-PRB-set。
其中，第二信令在所述K3个EPDCCH-PRB-set中的EPDCCH上传输，所述K3是正整数，所述时频位置指示第二信令所占用的EPDCCH。
作为一个实施例，所述时频位置指示：
-第一位置.第二信令所属的EPDCCH-PRB-set在所述K3个EPDCCH-PRB-set中的索引
-第二位置.第二信令所占用的EPDCCH在目标EPDCCH集合中的索引。其中，所述目标EPDCCH集合包括由第二信令的关联标识确定的在第二信令所属的EPDCCH-PRB-set中的所有EPDCCH候选(Candidate)。作为该实施例的一个子实施例，所述信令标识是C-RNTI，所述目标EPDCCH集合中的EPDCCH候选所占用的eCCE由第二信令的关联标识按照Harsh函数的方式映射，具体参考TS36.213中的9.1.4节。
作为一个实施例，第一高层信令是RRC(Radio Resource Control，无线资源控制)信令。作为一个实施例，所述K3个EPDCCH-PRB-set是子帧特定的(即第一高层信令只对当前子帧有效)，或者是子帧集合特定的(即第一高层信令只对特定子帧集合有效)。作为一个实施例，所述时频位置还指示对应的物理层信令(即第二信令)占用的EPDCCH是分布式(Distributed)的还是集中式的(Localized)。
作为一个实施例，所述K3大于2。
作为一个实施例，所述K3个EPDCCH-PRB-set共享相同的用于 EPDCCH资源映射参数，所述EPDCCH资源映射参数指示EPDCCH RE(Resource Element，资源粒子)映射时应当执行速率匹配(以避免占用)的RE。作为一个子实施例，所述EPDCCH资源映射参数包括{pdsch-Start-r11，crs-PortsCount-r11，crs-PortsCount-r11，csi-RS-ConfigZPId-r11}。
具体的，根据本发明的一个方面，所述时频位置指示第二信令所占用的PDCCH。其中，第二信令在PDCCH上传输。
本发明公开了一种支持多用户叠加的用户设备，其中,包括如下模块：
第一模块：用于接收第一信令，第一信令指示第二信令的辅助信息,所述辅助信息包括{时频位置，信令格式}中的至少一种
第二模块：用于根据第二信令的辅助信息接收第二信令，根据第二信令确定第二信令的关联标识。
第三模块：用于接收第一无线信号
其中，第一信令和第二信令都是物理层信令，第一无线信号由第一信令所调度，第一无线信号所占用的时频资源和第二无线信号所占用的时频资源全部或者部分重叠，第二无线信号由第二信令所调度。
本发明公开了一种支持多用户叠加的基站设备，其中,包括如下模块：
第一模块：用于发送第一信令，第一信令指示第二信令的辅助信息,所述辅助信息包括{时频位置，信令格式}中的至少一种
第二模块：用于根据第二信令的关联标识发送第二信令
第三模块：用于发送第一无线信号和第二无线信号。
其中，第一信令和第二信令都是物理层信令，第一无线信号由第一信令所调度，第一无线信号所占用的时频资源和第二无线信号所占用的时频资源全部或者部分重叠，第二无线信号由第二信令所调度。
相比现有公开技术，本发明具有如下技术优势：
-.减少针对近UE的调度信令的负载尺寸，同时支持叠加的无线信号之间相对独立的调度
-.降低了UE执行BD的次数，降低了UE的复杂度，同时避免了过多的BD次数导致的虚警增加。
附图说明
通过阅读参照以下附图所作的对非限制性实施例所作的详细描述，本发明的其它特征、目的和优点将会变得更加明显：
图1示出了根据本发明的一个实施例的下行多用户叠加的调度流程图；
图2示出了根据本发明的一个实施例的辅助信息的示意图；
图3示出了根据本发明的一个实施例的时频位置的示意图；
图4示出了根据本发明的一个实施例的UE中的处理装置的结构框图；
图5示出了根据本发明的一个实施例的基站中的处理装置的结构框图；
具体实施方式
下文将结合附图对本发明的技术方案作进一步详细说明，需要说明的是，在不冲突的情况下，本申请的实施例和实施例中的特征可以任意相互组合。
实施例1
实施例1示例了下行多用户叠加的调度流程图，如附图1所示。附图1中，基站N1是UE U2和UE U3的服务小区的维持基站，其中方框F1中的步骤是可选步骤。
对于基站N1，在步骤S11中发送第一信令，第一信令指示第二信令的辅助信息,所述辅助信息包括{时频位置，信令格式}中的至少一种。在步骤S12中根据第二信令的关联标识发送第二信令。在步骤S13中发送第一无线信号和第二无线信号。
对于UE U2，在步骤S21中接收第一信令。在步骤S22中根据第二信令的辅助信息接收第二信令，根据第二信令确定第二信令的关联标识。在步骤S23中接收第二无线信号，消除第二无线信号带来的干扰之后得到第一无线信号。
对于UE U3，在步骤S31中接收第一信令。在步骤S32中接收第二无线信号。
实施例1中，第一信令和第二信令都是物理层信令，第一无线信号 由第一信令所调度，第一无线信号所占用的时频资源和第二无线信号所占用的时频资源全部或者部分重叠，第二无线信号由第二信令所调度。第一信令的关联标识被配置给UE U2，第二信令的关联标识被配置给UE U3。
作为实施例1的子实施例1，所述关联标识是RNTI。
作为实施例1的子实施例2，第一无线信号和第二无线信号占用相同的频域资源，第一信令中不包括用于频域资源分配的信息比特(即UE U2根据第二信令中用于频域资源分配的信息比特确定第一无线信号所占用的频域资源)。
作为实施例1的子实施例3，第一信令中包括1个比特的标志位，所述标志位用于指示第一信令是{第一DCI格式，第二DCI格式}中的第二DCI格式。其中，第一DCI格式用于调度非多用户叠加的下行传输，第二DCI格式用于调度多用户叠加的下行传输。第二DCI格式中包含第一DCI格式中除去用于配置频域资源的信息比特之外的全部或者部分信息比特。
作为实施例1的子实施例4，实施例1的子实施例3中的第一DCI格式和第二DCI格式的负载尺寸相同。
作为实施例1的子实施例5，基站N1在步骤S10中发送第一高层信令指示K3个EPDCCH-PRB-set。UE U2在步骤S20中接收第一高层信令确定所述K3个EPDCCH-PRB-set。其中，第二信令在所述K3个EPDCCH-PRB-set中的EPDCCH上传输，所述K3是正整数，所述时频位置指示第二信令所占用的EPDCCH。
作为实施例1的子实施例6，UE U2在步骤S22中采用如下操作确定第二信令的关联标识：
-.根据所述信令格式确定第二信令的负载尺寸
-.根据所述时频位置确定第二信令占用的RE(Resource Element，资源粒子)
-.对第二信令进行译码操作，得到第二信令的信息比特和扰码后CRC，根据第二信令的信息比特计算出第二信令的扰码前的CRC，对第二信令的扰码前的CRC和扰码后的CRC进行异或运算得到第二信令的关联标识。
实施例2
实施例2示例了辅助信息的示意图，如附图2所示，其中箭头R1，R3标识的时频位置和R2标识的信令格式是可选的。需要说明的是，附图2仅描述辅助信息的内容，其中信息的排列顺序不限制在第一信令中的实际位置。
实施例2中，所述辅助信息包括{标志位，时频位置，信令格式}，分别映射到第一信令中的{第一域，第二域，第三域}。所述标志位包括1个比特，用于指示第一信令是第一DCI格式还是第二DCI格式，其中，第一DCI格式用于调度非多用户叠加的下行传输，第二DCI格式用于调度多用户叠加的下行传输。
作为实施例2的子实施例1，如箭头R1所示，所述时频位置包括分布方式，聚合度，以及起始eCCE的位置三个部分组成，其中分布方式包括1个比特，用于指示第二信令所占用的EPDCCH是分布式的还是集中式的。作为实施例2的子实施例1的一个子实施例，所述起始eCCE的位置是第二信令占用的第一个eCCE在(对应第二信令的聚合度的)所有可能作为第一个eCCE的候选eCCE集合中的索引。
作为实施例2的子实施例2，如箭头R3所示，所述时频位置包括聚合度，以及起始CCE的位置三个部分组成。
作为实施例2的子实施例3，如箭头R2所示，所述信令格式包括三个部分：
-.1个比特，用于指示是否包括CIF
-.可选的1个比特，用于指示是否包括SRS
-.3或者4个比特，用于指示第二信令的DCI格式。
作为实施例2的子实施例4，所述辅助信息还包括其他信息，对应第一信令中的第四域，所述其他信息包括以下至少之一：
-.第二信令是在PDCCH还是EPDCCH上
-.第二无线信号的发送功率相关参数。
实施例3
实施例3示例了时频位置的示意图，如附图3所示。其中，一个小方格是一个CCE或者一个eCCE，其中斜线标识的小方格是第二信令所占用的起始CCE或者起始eCCE的候选位置-第二信令的聚合度为4。
实施例3中，本发明中的所述时频位置指示第二信令的聚合度以及以下之一：
-.第二信令所占用的起始CCE在所有可能的候选CCE(如斜线标识的小方格-#0，#4，#8，#16，…)中的索引(而不需要直接指示第二信令所占用的起始CCE的索引)
-.第二信令所属的EPDCCH-PRB-set在本发明中的所述K3个EPDCCH-PRB-set中的索引，以及第二信令所占用的起始eCCE在第二信令所属的EPDCCH-PRB-set中的所有可能的候选eCCE(如斜线标识的小方格，#0，#4，#8，#16，…)中的索引。
实施例4
实施例4示例了一个UE中的处理装置的结构框图，如附图4所示。附图4中，UE处理装置200主要由第一接收模块201，第二接收模块202和第三接收模块203组成。
第一接收模块201用于接收第一信令，第一信令指示第二信令的辅助信息,所述辅助信息包括{时频位置，信令格式}中的至少一种。第二接收模块202用于根据第二信令的辅助信息接收第二信令，根据第二信令确定第二信令的关联标识。第三接收模块203用于接收第一无线信号。
实施例4中，第一信令和第二信令都是物理层信令，第一无线信号由第一信令所调度，第一无线信号所占用的时频资源和第二无线信号所占用的时频资源全部或者部分重叠，第二无线信号由第二信令所调度。所述关联标识是RNTI。
作为实施例4的子实施例1，第一接收模块201还用于接收RRC信令确定K3个EPDCCH-PRB-set。其中，第二信令在所述K3个EPDCCH-PRB-set中的EPDCCH上传输，所述K3是正整数，所述时频位置包括指示第二信令所占用的EPDCCH。
作为实施例4的子实施例2，第一信令中包括标志位，所述标志位用于指示所述标志位所属的物理层信令的DCI格式是{第一DCI格式，第二DCI格式}中的一种。其中，第一DCI格式用于调度非多用户叠加的下行传输，第二DCI格式用于调度多用户叠加的下行传输。
实施例5
实施例5示例了一个基站中的处理装置的结构框图，如附图5所示。 附图5中，基站处理装置300主要由第一发送模块301，第二发送模块302和第三发送模块303组成。
第一发送模块301用于发送第一信令，第一信令指示第二信令的辅助信息,所述辅助信息包括{时频位置，信令格式}中的至少一种。第二发送模块302用于根据第二信令的关联标识发送第二信令。第三发送模块303用于发送第一无线信号和第二无线信号。
实施例5中，第一信令和第二信令都是物理层信令，第一无线信号由第一信令所调度，第二无线信号由第二信令所调度。第一无线信号和第二无线信号在PDSCH上传输，第一无线信号和第二无线信号占用相同的PRB(Physical Resource Block，物理资源块)对(Pair)。
作为实施例5的子实施例1，所述时频位置指示第二信令所占用的PDCCH。其中，第二信令在PDCCH上传输。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可以通过程序来指令相关硬件完成，所述程序可以存储于计算机可读存储介质中，如只读存储器，硬盘或者光盘等。可选的，上述实施例的全部或部分步骤也可以使用一个或者多个集成电路来实现。相应的，上述实施例中的各模块单元，可以采用硬件形式实现，也可以由软件功能模块的形式实现，本申请不限于任何特定形式的软件和硬件的结合。本发明中的UE包括但不限于手机，平板电脑，笔记本，上网卡等无线通信设备。本发明中的基站包括但不限于宏蜂窝基站，微蜂窝基站，家庭基站，中继基站等无线通信设备。
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。凡在本发明的精神和原则之内，所做的任何修改，等同替换，改进等，均应包含在本发明的保护范围之内。

Claims (14)

  1. 一种支持多用户叠加的UE中的方法，其中，包括如下步骤：
    -步骤A.接收第一信令，第一信令指示第二信令的辅助信息,所述辅助信息包括{时频位置，信令格式}中的至少一种
    -步骤B.根据第二信令的辅助信息接收第二信令，根据第二信令确定第二信令的关联标识；
    -步骤C.接收第一无线信号；
    其中，第一信令和第二信令都是物理层信令，第一无线信号由第一信令所调度，第一无线信号所占用的时频资源和第二无线信号所占用的时频资源全部或者部分重叠，第二无线信号由第二信令所调度。
  2. 根据权利要求1所述的支持多用户叠加的UE中的方法，其特征在于，第一无线信号和第二无线信号占用相同的频域资源。
  3. 根据权利要求1，2所述的支持多用户叠加的UE中的方法，其特征在于，第一信令中包括标志位，所述标志位用于指示所述标志位所属的物理层信令的DCI格式是{第一DCI格式，第二DCI格式}中的一种；其中，第一DCI格式用于调度非多用户叠加的下行传输，第二DCI格式用于调度多用户叠加的下行传输。
  4. 根据权利要求3所述的支持多用户叠加的UE中的方法，其特征在于，第一DCI格式和第二DCI格式的负载尺寸相同，第二DCI格式中包含第一DCI格式中除去用于配置频域资源的信息比特之外的全部或者部分信息比特。
  5. 根据权利要求1-4中任一项所述的支持多用户叠加的UE中的方法，其特征在于，所述步骤A还包括如下步骤：
    -步骤A1.接收第一高层信令确定K3个EPDCCH-PRB-set；
    其中，第二信令在所述K3个EPDCCH-PRB-set中的EPDCCH上传输，所述K3是正整数，所述时频位置包括指示第二信令所占用的EPDCCH。
  6. 根据权利要求1-4中任一项所述的支持多用户叠加的UE中的方法，其特征在于，所述时频位置指示第二信令所占用的PDCCH；其中，第二信令在PDCCH上传输。
  7. 一种支持多用户叠加的基站中的方法，其中,包括如下步骤：
    -步骤A.发送第一信令，第一信令指示第二信令的辅助信息,所述辅助信息包括{时频位置，信令格式}中的至少一种
    -步骤B.根据第二信令的关联标识发送第二信令
    -步骤C.发送第一无线信号和第二无线信号；
    其中，第一信令和第二信令都是物理层信令，第一无线信号由第一信令所调度，第一无线信号所占用的时频资源和第二无线信号所占用的时频资源全部或者部分重叠，第二无线信号由第二信令所调度。
  8. 根据权利要求7所述的支持多用户叠加的基站中的方法，其特征在于，第一无线信号和第二无线信号占用相同的频域资源。
  9. 根据权利要求7或8所述的支持多用户叠加的基站中的方法，其特征在于，第一信令中包括标志位，所述标志位用于指示所述标志位所属的物理层信令的DCI格式是{第一DCI格式，第二DCI格式}中的一种；其中，第一DCI格式用于调度非多用户叠加的下行传输，第二DCI格式用于调度多用户叠加的下行传输。
  10. 根据权利要求9所述的支持多用户叠加的基站中的方法，其特征在于，第一DCI格式和第二DCI格式的负载尺寸相同，第二DCI格式中包含第一DCI格式中除去用于配置频域资源的信息比特之外的全部或者部分信息比特。
  11. 根据权利要求7-10中任一项所述的支持多用户叠加的基站中的方法，其特征在于，所述步骤A还包括如下步骤：
    -步骤A1.发送第一高层信令指示K3个EPDCCH-PRB-set；
    其中，第二信令在所述K3个EPDCCH-PRB-set中的EPDCCH上传输，所述K3是正整数，所述时频位置指示第二信令所占用的EPDCCH。
  12. 根据权利要求7-10中任一项所述的支持多用户叠加的基站中的方法，其特征在于，所述时频位置指示第二信令所占用的PDCCH。其中，第二信令在PDCCH上传输。
  13. 一种支持多用户叠加的用户设备，其中,包括如下模块：
    第一模块：用于接收第一信令，第一信令指示第二信令的辅助信息,所述辅助信息包括{时频位置，信令格式}中的至少一种
    第二模块：用于根据第二信令的辅助信息接收第二信令，根据第二信令确定第二信令的关联标识；
    第三模块：用于接收第一无线信号
    其中，第一信令和第二信令都是物理层信令，第一无线信号由第一 信令所调度，第一无线信号所占用的时频资源和第二无线信号所占用的时频资源全部或者部分重叠，第二无线信号由第二信令所调度。
  14. 一种支持多用户叠加的基站设备，其中,包括如下模块：
    第一模块：用于发送第一信令，第一信令指示第二信令的辅助信息,所述辅助信息包括{时频位置，信令格式}中的至少一种
    第二模块：用于根据第二信令的关联标识发送第二信令
    第三模块：用于发送第一无线信号和第二无线信号；
    其中，第一信令和第二信令都是物理层信令，第一无线信号由第一信令所调度，第一无线信号所占用的时频资源和第二无线信号所占用的时频资源全部或者部分重叠，第二无线信号由第二信令所调度。
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