WO2017148427A1 - 调度向量生成方法、串行干扰消除方法、基站及移动台 - Google Patents

调度向量生成方法、串行干扰消除方法、基站及移动台 Download PDF

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Publication number
WO2017148427A1
WO2017148427A1 PCT/CN2017/075514 CN2017075514W WO2017148427A1 WO 2017148427 A1 WO2017148427 A1 WO 2017148427A1 CN 2017075514 W CN2017075514 W CN 2017075514W WO 2017148427 A1 WO2017148427 A1 WO 2017148427A1
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Prior art keywords
mobile station
mtc
base station
data
code rate
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PCT/CN2017/075514
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English (en)
French (fr)
Inventor
李安新
蒋惠玲
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株式会社Ntt都科摩
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Priority to JP2018546028A priority Critical patent/JP2019512925A/ja
Publication of WO2017148427A1 publication Critical patent/WO2017148427A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/40—Support for services or applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows

Definitions

  • the present invention relates to the field of wireless communications, and in particular to a scheduling vector generation method, a serial interference cancellation method, and a corresponding base station and mobile station that can be used in a wireless communication system.
  • Non-Orthogonal Multiple Access is a wireless access technology proposed in LTE (Long Term Evolution) Release 13 of 3GPP (3rd Generation Partnership Project) research.
  • the base station at the transmitting end, the base station multiplexes data for a plurality of mobile stations at different power levels in each resource block to improve system throughput, and at the receiving end, the mobile station performs stringing on the received data.
  • Line interference cancellation (SIC) to get its own data.
  • MTC machine type communication
  • 4G and 5G communication systems In order to achieve a coverage enhancement of 15-20 dB, the same packet in the MTC technique will be retransmitted 200-300 times.
  • MTC mobile stations Compared to LTE mobile stations, MTC mobile stations use narrower bandwidth for transmission. If the base station wishes to multiplex data for the LTE mobile station with data for the MTC mobile station using the NOMA technology, the frequency band used by one LTE mobile station corresponds to the frequency band used by the plurality of MTC mobile stations.
  • a method of simultaneously scheduling two LTE mobile stations is provided.
  • the base station In the scheduling method, the base station generates a dedicated scheduling vector for the mobile station for one of the simultaneously scheduled LTE mobile stations, and notifies the other mobile station of the dedicated scheduling vector for another mobile station to perform serial interference cancellation.
  • the existing scheduling method causes a large amount of control signaling, and thus is not suitable for combining the NOMA and the MTC. Wireless communication system.
  • a scheduling vector generating method performed by a base station comprising: obtaining a machine type communication (MTC) mobile station that performs data transmission on each subband in a current transmission time interval (TTI) a code rate; generating a common MTC scheduling vector based on the obtained code rate; notifying the common MTC scheduling vector to all LTE mobile stations connected to the base station.
  • MTC machine type communication
  • a serial interference cancellation method performed by an LTE mobile station, comprising: performing blind detection on a modulation scheme of a Machine Type Communication (MTC) mobile station paired with the LTE mobile station, Determining a modulation scheme of an MTC mobile station paired with the LTE mobile station; determining a code rate of an MTC mobile station paired with the LTE mobile station according to a common MTC scheduling vector notified from a base station, wherein the common MTC scheduling vector And including rate information of an MTC mobile station indicating data transmission on each subband in a current TTI; and data for an MTC mobile station paired with the LTE mobile station according to the determined modulation mode and code rate Perform serial interference cancellation.
  • MTC Machine Type Communication
  • a base station comprising: a code rate acquisition unit configured to obtain a machine type communication (MTC) mobile station for performing data transmission on each subband in a current transmission time interval (TTI) a code rate; a scheduling vector generating unit configured to generate a common MTC scheduling vector according to the obtained code rate; and a transmitting unit configured to notify the LTE mobile station connected to the base station of the common MTC scheduling vector.
  • MTC machine type communication
  • an LTE mobile station comprising: a modulation mode determining unit configured to perform blind detection on a modulation mode of a machine type communication (MTC) mobile station paired with the LTE mobile station to determine a modulation scheme of the MTC mobile station paired with the LTE mobile station; the code rate determining unit is configured to determine a code rate of the MTC mobile station paired with the LTE mobile station according to a common MTC scheduling vector notified from the base station, where The common MTC scheduling vector includes code rate information indicating an MTC mobile station that performs data transmission on each subband in a current TTI; and a serial interference cancellation unit configured to be used according to the determined modulation mode and code rate The data of the MTC mobile station paired with the LTE mobile station performs serial interference cancellation.
  • MTC machine type communication
  • the scheduling vector generation method, the serial interference cancellation method, the base station, and the LTE mobile station it is possible to generate a common MTC scheduling vector for the MTC mobile station that performs data transmission on each subband in the current TTI.
  • the serial interference cancellation is performed on the data transmitted by the MTC mobile station, so that the base station does not need to generate a dedicated scheduling vector for each MTC mobile station, which enables the wireless communication system to support the signaling overhead as little as possible.
  • FIG. 1 shows a flow chart of a scheduling vector generation method performed by a base station according to an embodiment of the present invention.
  • FIG. 2 shows a schematic diagram of a candidate modulation scheme and a candidate code rate according to an example of the present invention.
  • FIG. 3 shows a schematic diagram of a common MTC scheduling vector in accordance with one example of the present invention.
  • FIG. 4 shows a schematic diagram of assigning a user identification to an MTC mobile station in accordance with one example of the present invention.
  • FIG. 5 shows a schematic diagram of a mobile station identification vector generated from the assigned user identification in FIG.
  • FIG. 6 shows a flow chart of a method of serial interference cancellation performed by a mobile station in accordance with an embodiment of the present invention.
  • FIG. 7 shows a flow diagram of a method of buffering user identification and data of an MTC mobile station for fast serial interference cancellation, in accordance with one example of the present invention.
  • Figure 8 shows a schematic diagram of a buffer for user identification and data for caching in an LTE mobile station in accordance with one example of the present invention.
  • Figure 9 shows a block diagram of a base station in accordance with an embodiment of the present invention.
  • FIG. 10 shows a block diagram of an LTE mobile station in accordance with one embodiment of the present invention.
  • FIG. 11 shows a block diagram of an LTE mobile station in accordance with another embodiment of the present invention.
  • a scheduling vector generating method, a serial interference canceling method, a base station, and a mobile station will be described below with reference to the accompanying drawings.
  • the same reference numerals are used to refer to the same elements.
  • the embodiments described herein are illustrative only and are not intended to limit the scope of the invention.
  • the UEs described herein may include various types of user terminals, such as mobile terminals (or mobile stations) or fixed terminals, however, for convenience, the UE and the mobile station may sometimes be used interchangeably.
  • a base station may multiplex data for an LTE mobile station with data for an MTC mobile station through NOMA.
  • a frequency band in which data transmission is performed includes a plurality of sub-bands (SBs), and each MTC mobile station uses one of the sub-bands for data transmission, and each LTE mobile station uses two of them.
  • SBs sub-bands
  • the base station can multiplex data for one LTE mobile station with data for multiple MTC mobile stations through NOMA.
  • FIG. 1 shows a flow chart of the scheduling vector generation method 100.
  • a mobile station needs to acquire and use information such as modulation mode, code rate, and the like of other mobile stations paired with it.
  • the base station may not notify the LTE mobile station of the modulation mode of the MTC mobile station, and the LTE mobile station may determine the modulation mode of the MTC mobile station by blind detection, and the base station The LTE mobile station can be notified of the code rate of the MTC mobile station only through the scheduling vector.
  • step S101 the code rate of the MTC mobile station that performs data transmission on each subband in the current TTI is obtained.
  • a common MTC scheduling vector is generated based on the obtained code rate.
  • various code rates that can be used by the MTC mobile station can be encoded in advance to indicate a corresponding code rate.
  • a codeword corresponding to a code rate of an MTC mobile station that performs data transmission on each subband may be determined in step S102, and a common MTC scheduling vector is generated according to each codeword.
  • the current MTC mobile station can use various modulation modes such as QPSK, 16QAM, and 64QAM, and each modulation mode can have multiple code rates corresponding to the mode.
  • a part of the modulation scheme is selected as a candidate modulation scheme from a plurality of modulation schemes in advance.
  • the MTC mobile station uses one of the candidate modulation schemes for data transmission. Therefore, the LTE mobile station only needs to perform blind detection on the modulation mode selected as the candidate modulation mode, which simplifies the complexity of the blind detection operation performed by the LTE mobile station.
  • a part of the code rate may be selected as a candidate code rate from a plurality of code rates corresponding to each candidate modulation mode in advance.
  • the MTC mobile station uses one of the candidate code rates for data transmission. Thereby, the control signaling required to notify the public MTC scheduling vector can be further reduced.
  • FIG. 2 shows a schematic diagram of a candidate modulation scheme and a candidate code rate according to an example of the present invention.
  • QPSK and 16QAM can be selected as candidate modulation schemes from among a plurality of modulation schemes that can be used by the MTC mobile station. Therefore, the LTE mobile station only needs to determine the modulation mode used by the MTC mobile station between the two modulation modes QPSK and 16QAM when performing blind detection.
  • code rates 1, 2, and 3 may be used to indicate candidate code rates 0.11, 0.28, and 0.48 corresponding to QPSK, respectively; similarly, codewords 1, 2, and 3 may be used to indicate candidate code rates of 0.31, 0.44, and 0.54, respectively, corresponding to 16QAM. .
  • codewords 1, 2, 3, 4, 5, 6 can be used to indicate candidate code rates 0.11, 0.28, 0.48, 0.31, 0.44, and 0.54, respectively.
  • FIG. 3 shows a schematic diagram of a common MTC scheduling vector in accordance with one example of the present invention.
  • the frequency band available for data transmission includes 6 sub-bands, ie, SB1 to SB6, where the MTC mobile station on SB1 is modulated using QPSK and is coded at a code rate of 0.11.
  • the common MTC scheduling vector 300 can be generated in accordance with the encoding described above in connection with FIG. As shown in FIG.
  • the SB1 field contains codeword 1
  • the SB2 field contains codeword 0
  • the SB3 field contains codeword 3
  • the SB4 field contains codeword 1
  • the SB5 field contains codeword 0, SB6.
  • the field contains codeword 3, where "0" indicates that no MTC mobile station is transmitting data with the base station on the SB.
  • the common MTC scheduling vector is notified to all LTE mobile stations connected to the base station.
  • the base station may scramble the common MTC scheduling vector using the radio network temporary identity and notify the LTE mobile station of the scrambled common MTC scheduling vector.
  • the common MTC scheduling vector is notified to all mobile stations in step S103, instead of generating a dedicated scheduling vector for a specific mobile station and notifying the specific scheduling vector to the specific mobile station as in the existing scheduling vector generation method Pairing another mobile station, so there is no need to use the mobile station specific wireless network temporary identity for scrambling, but can be scrambled using a public wireless network temporary identity, and all LTE mobile stations connected to the base station can use the public The wireless network temporary identifier is descrambled.
  • a public MTC radio network temporary identifier for all LTE mobile stations connected to the base station may be generated in advance, and all the LTE mobile stations connected to the base station are notified of the public MTC wireless Network temporary identification.
  • the common MTC scheduling vector is scrambled by the public MTC radio network temporary identifier, and the public MTC scheduling after the line scrambling is broadcasted to all LTE mobile stations connected to the base station in step S103 vector.
  • a common MTC scheduling vector is generated according to a code rate of an MTC mobile station that performs data transmission on each subband in the current TTI to perform serial interference cancellation, without The mobile stations generate separate scheduling vectors. This enables the wireless communication system to support the combined use of NOMA and MTC with as little signaling overhead as possible.
  • the scheduling vector generating method of the present embodiment it is not necessary to include information on the modulation scheme of each mobile station.
  • the MTC mobile station uses the narrowband for data transmission, and the occupied frequency band is a continuous resource block
  • the information about the frequency resource occupied by the MTC mobile station may also be omitted in the common MTC scheduling vector of this embodiment. The signaling overhead is thus further reduced.
  • the scheduling vector generation method 100 shown in FIG. 1 may further include the MTC mobile station assigning a user identity and notifying the LTE mobile station for the LTE mobile station to identify the transmission data information of the received MTC mobile station.
  • the scheduling vector generation method 100 may further include assigning a user identification (ID) to the MTC mobile station connected to the base station; generating a mobile station identification according to the user identification of the MTC mobile station performing data transmission on each subband in the current TTI. a vector; and notifying the mobile station identification vector to all LTE mobile stations connected to the base station.
  • ID user identification
  • the LTE mobile station can correspondingly store the user identity and data packet of the MTC mobile station, so that Serial interference cancellation is quickly performed using the stored data packets without the need to decode the data packets each time a data packet is transmitted.
  • FIG. 4 shows a schematic diagram of assigning a user identification to an MTC mobile station in accordance with one example of the present invention.
  • FIG. 5 shows a schematic diagram of a mobile station identification vector generated from the assigned user identification in FIG.
  • the frequency band available for data transmission includes 6 sub-bands, that is, SB1 to SB6, in which the MTC mobile station and the base station respectively perform data transmission on SB1, SB3, SB4, and SB6.
  • the base station may assign an ID value of 1 to an MTC mobile station that performs data transmission on SB1, an ID value of 2 to an MTC mobile station that performs data transmission on SB3, and an ID value of 3 to an MTC mobile station that performs data transmission on SB4, An ID value of 4 is assigned to the MTC mobile station that performs data transmission on the SB6. Then the base station can generate the result according to the ID allocation result shown in FIG.
  • the mobile station identification vector 500 is shown. In the example shown in FIG. 5, the size of the mobile station identification vector 500 corresponds to the maximum number of MTC mobile stations that can be connected to the base station in one TTI.
  • the ID value of the SB1 field is 1, the ID value of the SB2 field is 0, the ID value of SB3 is 2, the ID value of SB4 is 3, and the ID value of SB5 is 0, SB6
  • the ID value is 4, where "0" indicates that there is no MTC mobile station for data transmission on the SB.
  • the MTC mobile station that performs data transmission on each subband may change. Therefore, preferably, the base station can generate and notify the mobile station identification vector of the current TTI at each TTI.
  • the number of IDs that can be allocated to an MTC mobile station may be the maximum number of MTC mobile stations that can be connected to a base station in one TTI.
  • the maximum number of MTC mobile stations that can be connected to the base station in one TTI is 6, so IDs 1-6 can be set in advance for allocation to the MTC mobile station.
  • the MTC mobile station newly connected to the base station can be assigned an ID value of 5.
  • the MTC mobile that was previously connected to the base station and is no longer connected to the base station at the current TTI may be moved.
  • the station's ID value is assigned to the MTC mobile station that is newly connected to the base station.
  • FIG. 6 shows a flow diagram of a serial interference cancellation method 600 performed by a mobile station.
  • step S601 the modulation scheme of the MTC mobile station paired with the LTE mobile station is blindly checked to determine the modulation scheme of the MTC mobile station paired with the LTE mobile station.
  • an MTC mobile station paired with an LTE mobile station is an MTC mobile station whose frequency band for data transmission overlaps with a frequency band used by the LTE mobile station for data transmission.
  • the MTC mobile station whose downlink frequency band overlaps with the downlink frequency band of an LTE mobile station is the MTC mobile station paired with the LTE mobile station.
  • the LTE mobile station can adjust the modulation mode of the MTC mobile station that performs data transmission on the subband included in its downlink frequency band. Line blind inspection.
  • QPSK and 16QAM may be selected in advance as a candidate modulation scheme from among a plurality of modulation schemes that can be used by the MTC mobile station, that is, one of modulation modes QPSK and 16QAM of the MTC mobile station. Therefore, the LTE mobile station only needs to determine the modulation mode used by the MTC mobile station between the two modulation modes QPSK and 16QAM, which simplifies the complexity of the blind detection of the LTE mobile station.
  • the frequency band available for data transmission in the current TTI includes 6 sub-bands SB1 to SB6, assuming that the data transmission bands of one LTE mobile station are SB1 to SB3.
  • the LTE mobile station performs blind detection on the modulation mode of the MTC mobile station that performs data on SB1, SB2, and SB6, and determines that the MTC mobile station on SB1 uses QPSK for modulation, and there is no MTC mobile station on SB2.
  • the MTC mobile station on SB6 uses 16QAM for modulation.
  • a code rate of an MTC mobile station paired with an LTE mobile station may be determined according to a common MTC scheduling vector notified from the base station, where the common MTC scheduling vector includes a data transmission indicating that the data transmission is performed on each sub-band in the current TTI. Rate information of the MTC mobile station.
  • the common MTC scheduling vector can be generated by the method described above in connection with FIG. 1-4, and details are not described herein again.
  • the common MTC scheduling vector transmitted by the base station may be a scrambled common MTC scheduling vector.
  • an LTE mobile station when connected to a base station, an LTE mobile station may receive a public MTC radio network temporary identity from the base station to descramble the received vector.
  • the MTC mobile station on SB1 is modulated using QPSK according to step S601, and after the MTC mobile station on SB6 is modulated using 16QAM, according to the public shown in FIG.
  • the MTC scheduling vector 300 further obtains that the SB1 field contains codeword 1, the SB2 field contains codeword 0, the SB6 field contains codeword 3, and the MTC mobile station on SB1 can be determined to encode at a code rate of 0.11 according to a predetermined coding manner.
  • the MTC mobile station on SB6 is encoded at a code rate of 0.54.
  • step S601 and step S602 can be simultaneously performed.
  • step S603 serial interference cancellation is performed on the data of the MTC mobile station used for pairing with the LTE mobile station according to the determined modulation scheme and code rate.
  • the modulation mode of the MTC mobile station is obtained by blind detection, and the code rate of the MTC mobile station is obtained by the common MTC scheduling vector. This enables the wireless communication system to support the combined use of NOMA and MTC with as little signaling overhead as possible.
  • the LTE mobile station can store the corresponding storage of the user identification and data packets allocated to the MTC mobile station in order to use the stored data packet quickly. Serial interference cancellation is performed without the need to decode the data packet every time a data packet is transmitted.
  • the method of FIG. 6 may also include the step of buffering the user identification and data of the MTC mobile station for fast serial interference cancellation.
  • 7 shows a flow diagram of a method of buffering user identification and data of an MTC mobile station for fast serial interference cancellation, in accordance with one example of the present invention.
  • the user identification of the MTC mobile station connected to the base station and the data for the MTC mobile station corresponding to the user identification are buffered in step S701.
  • the user ID cached here and the data corresponding to the user ID may be obtained in the previous TTI.
  • the number of IDs that can be allocated to the MTC mobile station can be the maximum number of MTC mobile stations that can be connected to the base station in one TTI. Accordingly, the buffer size for caching the user identification and data in the LTE mobile station can be determined based on the maximum number of MTC mobile stations that can be connected to the base station in one TTI.
  • FIG. 8 shows a schematic diagram of a buffer for user identification and data for caching in an LTE mobile station in accordance with one example of the present invention. It is assumed that in the example shown in FIG. 8, the maximum number of MTC mobile stations that can be connected to the base station in one TTI is 6.
  • step S702 the user identifier of the MTC mobile station that performs data transmission on each subband in the current TTI is obtained according to the mobile station identification vector of the current TTI notified from the base station. Then, it is determined in step S703 whether there is a cache corresponding to the obtained user identifier. data. When there is cached data corresponding to the obtained user identifier, serial interference cancellation may be performed on the cached data corresponding to the obtained user identifier according to the determined modulation mode and code rate in step S603. On the other hand, when there is no cached data corresponding to the obtained user identification, data for the MTC mobile station corresponding to the obtained user identification may be detected in step S603; and according to the determined modulation method And code rate, serial interference cancellation with the detected data.
  • the IDs of the MTC mobile stations that perform data transmission on the respective sub-bands in the current TTI are 1, 2, and 3.
  • the data of the MTC mobile station with IDs 1 and 2 is pre-cached, and the LTE mobile station can utilize the cache data pair for IDs 1 and 2 according to the determined modulation scheme and code rate.
  • the data of the MTC mobile station is subjected to serial interference cancellation.
  • the LTE mobile station may first determine the SB occupied by the data of the MTC mobile station with IDs 1 and 2 according to the mobile station identification vector of the current TTI, and determine whether the cached data is determined (eg, according to steps S601 and S602)
  • the modulation scheme of the MTC mobile station on the SB corresponds to the code rate, and when the buffer data corresponds to the determined modulation scheme and code rate, serial interference cancellation is performed.
  • the LTE mobile station needs to re-detect the data for the MTC mobile station with IDs 1 and 2 in the current TTI, and The detected data is subjected to serial interference cancellation.
  • the LTE mobile station needs to detect the data transmitted by the MTC mobile station corresponding to the ID 3, and perform serial interference cancellation on the detected data.
  • the cached data may be updated according to the detected data.
  • the LTE mobile station stores the user identification and data packets of the MTC mobile station, so that the serial interference cancellation can be quickly performed using the stored data packets without each time transmitting data.
  • the data packet is decoded and the like.
  • FIG. 9 shows a block diagram of a base station 900 in accordance with an embodiment of the present invention.
  • the base station 900 includes a code rate acquisition unit 910, a scheduling vector generation unit 920, and a transmission unit 930.
  • base station 900 may also include other components, however, since these components are not related to the content of embodiments of the present invention, The illustration and description thereof are omitted here.
  • the specific details of the operations described below performed by the base station 900 according to the embodiment of the present invention are the same as those described above with reference to FIGS. 1-5, repeated description of the same details is omitted herein to avoid redundancy.
  • the base station 900 may not notify the LTE mobile station of the modulation mode of the MTC mobile station, and the LTE mobile station may determine the modulation mode of the MTC mobile station by blind detection, and The base station 900 can notify the LTE mobile station of the code rate of the MTC mobile station only through the scheduling vector.
  • the code rate acquisition unit 910 obtains the code rate of the MTC mobile station that performs data transmission on each sub-band in the current TTI.
  • the scheduling vector generation unit 920 then generates a common MTC scheduling vector based on the obtained code rate.
  • various code rates that can be used by the MTC mobile station can be encoded in advance to indicate a corresponding code rate.
  • the scheduling vector generation unit 920 may determine codewords corresponding to the code rates of the MTC mobile stations that perform data transmission on the respective subbands, and generate a common MTC scheduling vector according to the respective codewords.
  • the current MTC mobile station can use various modulation modes such as QPSK, 16QAM, and 64QAM, and each modulation mode can have multiple code rates corresponding to the mode.
  • the base station 900 may further include a modulation mode selecting unit to select a part of the modulation modes from the plurality of modulation modes in advance as the candidate modulation mode.
  • the MTC mobile station uses one of the candidate modulation schemes for data transmission. Therefore, the LTE mobile station only needs to perform blind detection on the modulation mode selected as the candidate modulation mode, which simplifies the complexity of the blind detection operation performed by the LTE mobile station.
  • the base station 900 may further include a code rate selecting unit to select a part of the code rate from the plurality of code rates corresponding to each of the candidate modulation modes in advance as the candidate code rate.
  • the MTC mobile station uses one of the candidate code rates for data transmission. Thereby, the control signaling required to notify the public MTC scheduling vector can be further reduced.
  • the transmitting unit 930 notifies the LTE mobile station connected to the base station of the common MTC scheduling vector.
  • the base station may scramble the common MTC scheduling vector using the radio network temporary identity and notify the LTE mobile station of the scrambled common MTC scheduling vector.
  • the base station 900 may further include an identification generating unit and a vector processing unit.
  • the transmitting unit 930 notifies the mobile station of the common MTC scheduling vector, instead of generating a dedicated scheduling vector for a specific mobile station as in the existing scheduling vector generation method and The dedicated scheduling vector is notified to pair with the particular mobile station for another mobile station, so there is no need to use the mobile station specific wireless network temporary identity for scrambling, but can be scrambled using a public wireless network temporary identity and connected to the base station All of the LTE mobile stations can use the public wireless network temporary identity to descramble.
  • the identity generation unit may generate a common MTC radio network temporary identity for all LTE mobile stations connected to the base station in advance, and the transmitting unit may notify the LTE mobile station connected to the base station of the public MTC wireless network temporary identity.
  • the scheduling vector generation unit 920 may generate the common MTC scheduling vector
  • the vector processing unit may scramble the common MTC scheduling vector through the public MTC radio network temporary identification, and the transmitting unit 930 scrambles the broadcast lines to all LTE mobile stations connected to the base station. Public MTC scheduling vector.
  • a common MTC scheduling vector is generated according to a code rate of an MTC mobile station that performs data transmission on each subband in the current TTI to perform serial interference cancellation, without requiring each mobile station Generate a separate dispatch vector.
  • the base station 900 in the present embodiment may not need to include information on the modulation scheme of each mobile station.
  • the MTC mobile station uses the narrowband for data transmission, and the occupied frequency band is a continuous resource block
  • the information about the frequency resource occupied by the MTC mobile station may also be omitted in the common MTC scheduling vector of this embodiment. The signaling overhead is thus further reduced.
  • the base station 900 can also assign a user identity to the MTC mobile station and notify the LTE mobile station for the LTE mobile station to identify the transmission data information of the received MTC mobile station.
  • the base station 900 may further include an identity allocation unit and an identification vector generating unit.
  • the identity assignment unit may assign a subscriber identity (ID) to the MTC mobile station connected to the base station.
  • the identification vector generation unit may generate the mobile station identification vector based on the user identification of the MTC mobile station that performs data transmission on each subband in the current TTI.
  • the transmitting unit 930 can also notify the mobile station identification vector to all LTE mobile stations connected to the base station.
  • the LTE mobile station can correspondingly store the user identity and data packet of the MTC mobile station, so that Serial interference cancellation is quickly performed using the stored data packets without the need to decode the data packets each time a data packet is transmitted.
  • the size of the mobile station identification vector may correspond to the maximum number of MTC mobile stations that can be connected to the base station in one TTI.
  • the MTC employs frequency hopping techniques to obtain frequency gain, in each TTI, the MTC mobile station that performs data transmission on each subband may change. Therefore, preferably, base station 900 can generate and notify the mobile station identification vector of the current TTI at each TTI.
  • the number of IDs that can be assigned to the MTC mobile station by the identity allocation unit may be the maximum number of MTC mobile stations that can be connected to the base station in one TTI. There may be an MTC mobile station that is newly connected to the base station at the current TTI. In this case, in order to avoid duplication with the ID assigned to the MTC mobile station already connected to the base station, it is preferable to identify the allocation unit to allocate an ID that has not been previously assigned to the MTC mobile station newly connected to the base station at the current TTI.
  • the identity allocation unit may connect to the base station previously and no longer connect to the base station at the current TTI.
  • the ID value of the MTC mobile station is assigned to the MTC mobile station newly connected to the base station.
  • FIG. 10 shows a block diagram of an LTE mobile station 1000 in accordance with one embodiment of the present invention.
  • the LTE mobile station 1000 includes a modulation scheme determining unit 1010, a code rate determining unit 1020, and a serial interference canceling unit 1030.
  • the LTE mobile station 1000 may include other components in addition to these three units, however, since these components are not related to the content of the embodiment of the present invention, the illustration and description thereof are omitted herein. Further, since the specific details of the operations described below performed by the LTE mobile station 1000 according to the embodiment of the present invention are the same as those described above with reference to FIGS. 6-8, repeated description of the same details is omitted herein to avoid repetition.
  • the modulation scheme determining unit 1010 performs blind detection on the modulation scheme of the MTC mobile station paired with the LTE mobile station to determine the modulation scheme of the MTC mobile station paired with the LTE mobile station.
  • an MTC mobile station paired with an LTE mobile station is an MTC mobile station whose frequency band for data transmission overlaps with a frequency band used by the LTE mobile station for data transmission.
  • the MTC mobile station whose downlink frequency band overlaps with the downlink frequency band of an LTE mobile station is the MTC mobile station paired with the LTE mobile station.
  • the modulation scheme determining unit 1010 can perform blind detection on the modulation scheme of the MTC mobile station that performs data transmission on the subband included in its downlink frequency band.
  • QPSK and 16QAM may be selected in advance as a candidate modulation scheme from among a plurality of modulation schemes that can be used by the MTC mobile station, that is, one of modulation modes QPSK and 16QAM of the MTC mobile station. Therefore, the modulation mode determining unit 1010 only needs to determine the modulation mode used by the MTC mobile station between the two modulation modes QPSK and 16QAM when performing the blind detection, which simplifies the complexity of the blind detection.
  • the code rate determining unit 1020 may determine a code rate of the MTC mobile station paired with the LTE mobile station according to the common MTC scheduling vector notified from the base station, where the common MTC scheduling vector includes a data transmission indicating that the data transmission is performed on each sub-band in the current TTI. Rate information of the MTC mobile station.
  • the blind detection may be performed by the modulation mode determining unit 1010, and then the code of the MTC mobile station paired with the LTE mobile station is determined by the code rate determining unit 1020 according to the determined modulation mode and the common MTC scheduling vector. rate.
  • the modulation mode determining unit 1010 may perform blind detection at the same time and determine the code rate by the code rate determining unit 1020.
  • serial interference cancellation unit 1030 performs serial interference cancellation on the data of the MTC mobile station used for pairing with the LTE mobile station according to the determined modulation scheme and code rate.
  • the LTE mobile station obtains the modulation scheme of the MTC mobile station by blind detection, and obtains the code rate of the MTC mobile station through the common MTC scheduling vector. This enables the wireless communication system to support the combined use of NOMA and MTC with as little signaling overhead as possible.
  • the LTE mobile station can store the corresponding storage of the user identification and data packets allocated to the MTC mobile station in order to use the stored data packet quickly. Serial interference cancellation is performed without the need to decode the data packet every time a data packet is transmitted.
  • FIG. 11 shows a block diagram of an LTE mobile station 1100 in accordance with another embodiment of the present invention.
  • the LTE mobile station 1100 includes a modulation scheme determining unit 1110, a code rate determining unit 1120, and a serial interference canceling unit, which are similar to the modulation scheme determining unit 1010, the code rate determining unit 1020, and the serial interference canceling unit 1030, respectively. 1130.
  • the LTE mobile station 1100 further includes a buffer unit 1140, an identity acquisition unit 1150, and a data determination unit 1160.
  • the buffer unit 1140 buffers the user identifier of the MTC mobile station connected to the base station and the data for the MTC mobile station corresponding to the user identifier.
  • the user ID cached here and used The data corresponding to the subscriber identity may be obtained in the previous TTI.
  • the number of IDs that can be allocated to the MTC mobile station can be the maximum number of MTC mobile stations that can be connected to the base station in one TTI. Accordingly, the buffer size for caching the user identification and data in the LTE mobile station can be determined based on the maximum number of MTC mobile stations that can be connected to the base station in one TTI.
  • the identifier obtaining unit 1150 obtains the user identifier of the MTC mobile station that performs data transmission on each subband in the current TTI according to the mobile station identification vector of the current TTI notified from the base station.
  • the data determining unit 1160 determines whether there is cached data corresponding to the obtained user identification.
  • the serial interference cancellation unit 1130 may perform serial interference on the buffered data corresponding to the obtained user identifier according to the determined modulation mode and code rate. eliminate.
  • the serial interference cancellation unit 1130 may detect data for the MTC mobile station corresponding to the obtained user identification; and according to the determined Modulation mode and code rate for serial interference cancellation with the detected data.
  • the buffer unit 1140 may update the cached data according to the detected data after detecting data for the MTC mobile station corresponding to the obtained user identifier.
  • the LTE mobile station stores the user identification and data packets of the MTC mobile station, so that the serial interference cancellation can be quickly performed using the stored data packets without being required to transmit data packets each time.
  • the data packet is decoded and the like.
  • the operations of the above-described base station 900 and LTE mobile stations 1000, 1100 may be implemented by hardware, by software modules executed by a processor, and further by a combination of the two.
  • the software modules can be arranged in any format of storage medium, such as RAM (random access memory), flash memory, ROM (read only memory), EPROM (erasable programmable ROM), EEPROM (electrically erasable programmable ROM) , registers, hard drives, removable discs, and CD-ROM.
  • RAM random access memory
  • flash memory ROM (read only memory)
  • EPROM erasable programmable ROM
  • EEPROM electrically erasable programmable ROM
  • registers hard drives, removable discs, and CD-ROM.
  • Such a storage medium is coupled to the processor such that the processor can write information to or read information from the storage medium.
  • Such storage media can also be accumulated in the processor.
  • Such a storage medium and processor can be arranged in an ASIC.
  • Such an ASIC can be arranged in base station 900 and LTE mobile stations 1000, 1100.
  • As a discrete component, such a storage medium and processor can be arranged In base station 900 and LTE mobile stations 1000, 1100.

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Abstract

本发明的实施例提供了一种调度向量生成方法、串行干扰消除方法、基站及移动台。根据本发明实施例的调度向量生成方法由基站执行，包括：获得在当前传输时间间隔(TTI)中在各个子带上进行数据传输的机器类型通信(MTC)移动台的码率；根据所获得的码率生成公共MTC调度向量；向连接到所述基站的所有LTE移动台通知所述公共MTC调度向量。

Description

调度向量生成方法、串行干扰消除方法、基站及移动台 技术领域
本发明涉及无线通信领域，并且具体涉及可以在无线通信系统中使用的调度向量生成方法、串行干扰消除方法、以及相应的基站及移动台。
背景技术
非正交多址(NOMA)是在3GPP(第三代合作伙伴计划)研究的LTE(长期演进)Release 13中提出的无线接入技术。在NOMA系统中，在发送端，基站在每个资源块中以不同的功率级复用用于多个移动台的数据以提高系统吞吐量，在接收端，移动台对于所接收到数据进行串行干扰消除(SIC)，以获得自身的数据。
另一方面，机器类型通信(MTC)已成为在4G和5G通信系统中使用的重要技术。为了获得15-20dB的覆盖增强，在MTC技术相同的分组将被重发200-300次。与LTE移动台相比，MTC移动台使用较窄的带宽进行传输。如果基站希望使用NOMA技术将用于LTE移动台的数据与用于MTC移动台的数据复用，则一个LTE移动台所使用的频带对应于多个MTC移动台所使用的频带。
在目前在NOMA系统中，提供了同时调度两个LTE移动台的方法。在该调度方法中基站对于同时被调度的LTE移动台中一个生成该移动台的专用调度向量，并且向另一移动台通知该专用调度向量，以便另一移动台进行串行干扰消除。然而，当基站将用于LTE移动台的数据与用于MTC移动台的数据进行复用时，现有的调度方法会造成需要大量的控制信令，因此不适用于将NOMA与MTC组合使用的无线通信系统。
发明内容
根据本发明的一个方面，提供了一种由基站执行的调度向量生成方法，包括：获得在当前传输时间间隔(TTI)中在各个子带上进行数据传输的机器类型通信(MTC)移动台的码率；根据所获得的码率生成公共MTC调度向量；向连接到所述基站的所有LTE移动台通知所述公共MTC调度向量。
根据本发明的另一方面，提供了一种由LTE移动台执行的串行干扰消除方法，包括：对与所述LTE移动台配对的机器类型通信(MTC)移动台的调制方式进行盲检，以确定与所述LTE移动台配对的MTC移动台的调制方式；根据从基站通知的公共MTC调度向量，确定与所述LTE移动台配对的MTC移动台的码率，其中所述公共MTC调度向量包括指示在当前TTI中在各个子带上进行数据传输的MTC移动台的码率信息；以及根据所确定的调制方式和码率，对用于与所述LTE移动台配对的MTC移动台的数据进行串行干扰消除。
根据本发明的再一方面，提供了一种基站，包括：码率获取单元，配置为获得在当前传输时间间隔(TTI)中在各个子带上进行数据传输的机器类型通信(MTC)移动台的码率；调度向量生成单元，配置为根据所获得的码率生成公共MTC调度向量；发送单元，配置为向连接到所述基站的所有LTE移动台通知所述公共MTC调度向量。
根据本发明的又一方面，提供了一种LTE移动台包括：调制方式确定单元，配置为对与所述LTE移动台配对的机器类型通信(MTC)移动台的调制方式进行盲检，以确定与所述LTE移动台配对的MTC移动台的调制方式；码率确定单元，配置为根据从基站通知的公共MTC调度向量，确定与所述LTE移动台配对的MTC移动台的码率，其中所述公共MTC调度向量包括指示在当前TTI中在各个子带上进行数据传输的MTC移动台的码率信息；以及串行干扰消除单元，配置为根据所确定的调制方式和码率，对用于与所述LTE移动台配对的MTC移动台的数据进行串行干扰消除。
利用根据本发明上述方面的调度向量生成方法、串行干扰消除方法、基站及LTE移动台，可以通过生成关于在当前TTI中、在各个子带上进行数据传输的MTC移动台的公共MTC调度向量，对MTC移动台传输的数据进行串行干扰消除，从而基站不需要对每个MTC移动台生成专用的调度向量，这使得无线通信系统能够在尽可能小地增加信令开销的情况下，支持NOMA与MTC的组合使用。
附图说明
通过结合附图对本发明的实施例进行详细描述，本发明的上述和其它目 的、特征、优点将会变得更加清楚。
图1示出根据本发明实施例的由基站执行的调度向量生成方法的流程图。
图2示出了根据本发明的一个示例的候选调制方式和候选码率的示意图。
图3示出了根据本发明的一个示例的公共MTC调度向量的示意图。
图4示出了根据本发明的一个示例向MTC移动台分配用户标识的示意图。
图5示出了根据图4中分配的用户标识生成的移动台标识向量的示意图。
图6示出根据本发明实施例的由移动台执行的串行干扰消除方法的流程图。
图7示出了根据本发明的一个示例，缓存MTC移动台的用户标识和数据以进行快速串行干扰消除的方法的流程图。
图8示出了根据本发明的一个示例在LTE移动台中用于缓存的用户标识以及数据的缓存器的示意图。
图9示出了根据本发明实施例的基站的框图。
图10示出了根据本发明一个实施例的LTE移动台的框图。
图11示出了根据本发明另一实施例的LTE移动台的框图。
具体实施方式
下面将参照附图来描述根据本发明实施例的调度向量生成方法、串行干扰消除方法、基站及移动台。在附图中，相同的参考标号自始至终表示相同的元件。应当理解：这里描述的实施例仅仅是说明性的，而不应被解释为限制本发明的范围。此外，这里所述的UE可以包括各种类型的用户终端，例如移动终端(或称为移动台)或者固定终端，然而，为方便起见，在下文中有时候可互换地使用UE和移动台。
在根据本发明的示例中，在一个TTI中，基站可将用于LTE移动台的数据与用于MTC移动台的数据通过NOMA进行复用。具体地，在一个TTI中，进行数据传输的频带包括多个子带(Sub Band,SB)，并且每个MTC移动台使用其中的一个子带进行数据传输，而每个LTE移动台使用其中的两个 或更多子带进行数据传输。换言之，基站可将用于一个LTE移动台的数据与用于多个MTC移动台的数据通过NOMA进行复用。
首先，参照图1描述根据本发明实施例的由基站执行的调度向量生成方法。图1示出该调度向量生成方法100的流程图。在串行干扰消除时，一移动台需要获取并使用与其配对的其他移动台的调制方式、码率等信息。为了进一步减少所需使用的控制信令，根据本发明实施例，基站可不向LTE移动台通知MTC移动台的调制方式，并且LTE移动台可通过盲检来确定MTC移动台的调制方式，而基站可仅通过调度向量向LTE移动台通知MTC移动台的码率。
如图1所示，在步骤S101中，获得在当前TTI中、在各个子带上进行数据传输的MTC移动台的码率。然后在步骤S102中，根据所获得的码率生成公共MTC调度向量。根据本发明的一个示例，可预先对MTC移动台能够使用的各种码率进行编码，以指示相应的码率。在步骤S102中可确定与在各个子带上进行数据传输的MTC移动台的码率对应的码字，并且根据各个码字生成公共MTC调度向量。
目前的MTC移动台可使用QPSK、16QAM、64QAM等多种调制方式，并且每种调制方式可具有与该方式对应的多种码率。优选地，可预先从多个调制方式中选择一部分调制方式作为候选调制方式。MTC移动台在数据传输时使用候选调制方式中的一个调制方式。从而LTE移动台仅需要对被选择为候选调制方式的调制方式进行盲检，简化了LTE移动台进行的盲检操作的复杂度。此外，还可预先从每个候选调制方式对应多个码率中选择一部分码率作为候选码率。MTC移动台在数据传输时使用候选码率中的一个码率。从而可进一步减少通知公共MTC调度向量所需使用的控制信令。
图2示出了根据本发明的一个示例的候选调制方式和候选码率的示意图。如图2所示，可预先从MTC移动台能够使用的多个调制方式中选择QPSK和16QAM作为候选调制方式。从而LTE移动台在进行盲检时仅需在QPSK和16QAM这两种调制方式之间确定MTC移动台所使用的调制方式。
此外，可预先从QPSK对应的所有码率中选择三个码率作为QPSK对应的候选码率；类似地，可预先从16QAM对应的所有码率中选择三个码率作为16QAM对应的候选码率(如图2中灰色条目所示)。根据本发明的一个 示例，可使用码字1、2、3分别指示QPSK对应的候选码率0.11、0.28和0.48；类似地，可使用码字1、2、3分别指示16QAM对应的候选码率0.31、0.44和0.54。
应注意，虽然在此以QPSK和16QAM均使用码字1、2、3来表示候选码率为例进行了描述，但是本发明不限于此。在本发明的可替换实施例中，可使用不同的码字来表示候选码率。例如，可使用码字1、2、3、4、5、6来分别指示候选码率0.11、0.28、0.48、0.31、0.44和0.54。
图3示出了根据本发明的一个示例的公共MTC调度向量的示意图。在图3所示的示例中，假设在当前TTI中，可用于数据传输的频带包括6个子带，即，SB1至SB6，其中在SB1上的MTC移动台使用QPSK进行调制并以码率0.11进行编码，在SB2上没有MTC移动台进行数据传输，在SB3上的MTC移动台使用QPSK进行调制并以码率0.48进行编码，在SB4上的MTC移动台使用16QAM进行调制并以码率0.31进行编码，在SB5上没有MTC移动台进行数据传输，在SB6上的MTC移动台使用16QAM进行调制并以码率0.54进行编码。根据步骤S102，可按照以上结合图2描述的编码方式生成公共MTC调度向量300。如图3所示，在公共MTC调度向量300中，SB1字段包含码字1，SB2字段包含码字0，SB3字段包含码字3，SB4字段包含码字1，SB5字段包含码字0，SB6字段包含码字3，其中“0”表示在该SB上没有MTC移动台与基站进行数据传输。
返回图1，在步骤S103中，向连接到基站的所有LTE移动台通知所述公共MTC调度向量。例如，基站可使用无线网络临时标识对公共MTC调度向量加扰，并将加扰后的公共MTC调度向量通知给LTE移动台。
由于在步骤S103中向所有移动台通知该公共MTC调度向量，而不是如现有的调度向量生成方法那样，生成关于特定移动台的专用调度向量并将该专用调度向量通知给与该特定移动台配对另一移动台，因此不需要使用移动台特定的无线网络临时标识进行加扰，而是可使用公共的无线网络临时标识进行加扰，并且连接到基站的所有LTE移动台可使用该公共的无线网络临时标识进行解扰。
具体地，可预先生成对于连接到基站的所有LTE移动台的公共MTC无线网络临时标识，并向连接到基站的所有LTE移动台通知该公共MTC无线 网络临时标识。在根据步骤S102生成公共MTC调度向量之后，通过公共MTC无线网络临时标识对公共MTC调度向量进行加扰，并且在步骤S103中向连接到基站的所有LTE移动台广播行加扰后的公共MTC调度向量。
在本实施例的调度向量生成方法中，根据在关于当前TTI中、在各个子带上进行数据传输的MTC移动台的码率生成公共MTC调度向量以进行串行干扰消除，而不需要对每个移动台生成单独的调度向量。这使得无线通信系统能够在尽可能小地增加信令开销的情况下，支持NOMA与MTC的组合使用。
此外在本实施例的调度向量生成方法中，可不需要包括关于各个移动台的调制方式的信息。另外，考虑到MTC移动台使用窄带进行数据传输，并且所占用频带为连续的资源块，在本实施例的公共MTC调度向量中还可省略关于MTC移动台所占用的频率资源的信息。因而进一步减小了信令开销。
此外，图1中所示的调度向量生成方法100还可包括MTC移动台分配用户标识并通知给LTE移动台，以便LTE移动台对接收到的MTC移动台的传输数据信息标识。具体地，调度向量生成方法100还可包括对于连接到基站的MTC移动台分配用户标识(ID)；根据在当前TTI中在各个子带上进行数据传输的MTC移动台的用户标识生成移动台标识向量；以及向连接到基站的所有LTE移动台通知移动台标识向量。由于在MTC技术相同的数据分组将被重发200-300次，所以通过向MTC移动台分配用户标识并通知给LTE移动台，LTE移动台可对应存储MTC移动台的用户标识和数据分组，以便使用所存储的数据分组快速地进行串行干扰消除，而不需要在每次发送数据分组时都对该数据分组进行解码等操作。
图4示出了根据本发明的一个示例向MTC移动台分配用户标识的示意图。图5示出了根据图4中分配的用户标识生成的移动台标识向量的示意图。如图4所示，在当前TTI中，可用于数据传输的频带包括6个子带，即，SB1至SB6，其中在SB1、SB3、SB4和SB6上分别有MTC移动台与基站进行数据传输。基站可对于在SB1上进行数据传输的MTC移动台分配ID值1，对于在SB3上进行数据传输的MTC移动台分配ID值2，对于在SB4上进行数据传输的MTC移动台分配ID值3，对于在SB6上进行数据传输的MTC移动台分配ID值4。然后基站可根据图4中所示的ID分配结果，生成图5 中示出的移动台标识向量500。在图5所示的示例中，移动台标识向量500的大小与在一个TTI中能够连接到基站的MTC移动台的最大个数相对应。具体地，在移动台标识向量500中，SB1字段的ID值为1，SB2字段的ID值为0，SB3的ID值为2，SB4的ID值为3，SB5的ID值为0，SB6的ID值为4，其中“0”表示在该SB上没有MTC移动台进行数据传输。
由于MTC采用跳频技术以获得频率增益，在每个TTI中，在各个子带上进行数据传输的MTC移动台可能改变。因此优选地，基站可在每个TTI生成并通知当前TTI的移动台标识向量。
根据本发明的一个示例，能够被分配给MTC移动台的ID的个数可以为在一个TTI中能够连接到基站的MTC移动台的最大个数。例如在图4和图5所示的示例中，在一个TTI中能够连接到基站的MTC移动台的最大个数为6，因此可预先设置ID 1-6以便分配给MTC移动台。
可能存在在当前TTI新连接到基站的MTC移动台。在此情况下，为了避免与分配给已经连接到基站的MTC移动台的ID重复，优选地可对于在当前TTI新连接到基站的MTC移动台分配先前没有被分配过的ID。例如，假设在图4和图5所示的TTI的下一TTI中存在新连接到基站的MTC移动台，则可对该新连接到基站的MTC移动台分配ID值5。此外，在所有预定ID均已被分配给MTC移动台，并且在当前TTI存在新连接到基站的MTC移动台的情况下，可将先前与基站连接而在当前TTI不再与基站连接的MTC移动台的ID值分配给新连接到基站的MTC移动台。
下面，参照图6描述根据本发明实施例的由移动台执行的串行干扰消除方法。图6示出由移动台执行的串行干扰消除方法600的流程图。如图6所示，在步骤S601中，对与LTE移动台配对的MTC移动台的调制方式进行盲检，以确定与LTE移动台配对的MTC移动台的调制方式。具体地，在NOMA系统中，与LTE移动台配对的MTC移动台为其用于数据传输的频带与LTE移动台用于数据传输的频带重叠的MTC移动台。换言之，在当前TTI中，其下行链路频带与一LTE移动台的下行链路频带重叠的MTC移动台为与该LTE移动台配对的MTC移动台。在步骤S601中，LTE移动台可对在其下行链路频带所包含的子带上进行数据传输的MTC移动台的调制方式进 行盲检。
此外如上所述，可预先从MTC移动台能够使用的多个调制方式中选择QPSK和16QAM作为候选调制方式，即，MTC移动台的调制方式QPSK和16QAM中的一种。从而LTE移动台在进行盲检时仅需在QPSK和16QAM这两种调制方式之间确定MTC移动台所使用的调制方式，简化了LTE移动台盲检的复杂性。
例如，在以上结合图3描述的示例中，在当前TTI中可用于数据传输的频带包括SB1至SB6这6个子带，假设一LTE移动台的数据传输频带为SB1至SB3。根据步骤S601，LTE移动台对在SB1、SB2和SB6上进行数据的MTC移动台的调制方式进行盲检，并确定在SB1上的MTC移动台使用QPSK进行调制，在SB2上没有MTC移动台进行数据传输，在SB6上的MTC移动台使用16QAM进行调制。
在步骤S602中，可根据从基站通知的公共MTC调度向量，确定与LTE移动台配对的MTC移动台的码率，其中公共MTC调度向量包括指示在当前TTI中在各个子带上进行数据传输的MTC移动台的码率信息。可通过以上结合图1-4描述的方法生成公共MTC调度向量，在此不再赘述。此外如上所述，基站发送的公共MTC调度向量可以是加扰后的公共MTC调度向量。根据本发明的一个示例，LTE移动台在与基站连接时，可从基站接收公共MTC无线网络临时标识，以便对接收到的向量解扰。
例如在以上结合图3描述的示例中，在根据步骤S601确定在SB1上的MTC移动台使用QPSK进行调制，在SB6上的MTC移动台使用16QAM进行调制之后，可根据图3中所示的公共MTC调度向量300进一步获得SB1字段包含码字1，SB2字段包含码字0，SB6字段包含码字3，并且根据预定的编码方式可确定在SB1上的MTC移动台以码率0.11进行编码，在SB6上的MTC移动台以码率0.54进行编码。
应注意，虽然在此先执行步骤S601再执行步骤S602为例进行了描述，但是本发明不限于此。例如，在不需要根据调制方式确定MTC移动台的码率的情况下，可同时执行步骤S601和步骤S602。
最后在步骤S603中，根据所确定的调制方式和码率，对用于与LTE移动台配对的MTC移动台的数据进行串行干扰消除。
在本实施例的串行干扰消除方法中，通过盲检获得MTC移动台的调制方式，并且通过公共MTC调度向量获得MTC移动台的码率。这使得无线通信系统能够在尽可能小地增加信令开销的情况下，支持NOMA与MTC的组合使用。
此外如上所述，由于在MTC技术相同的数据分组将被重发200-300次，所以LTE移动台可存储对应存储分配给MTC移动台的用户标识和数据分组，以便使用所存储的数据分组快速地进行串行干扰消除，而不需要在每次发送数据分组时都对该数据分组进行解码等操作。
具体地，图6中的方法还可包括缓存MTC移动台的用户标识和数据以进行快速串行干扰消除的步骤。图7示出了根据本发明的一个示例，缓存MTC移动台的用户标识和数据以进行快速串行干扰消除的方法的流程图。如图7所示，在步骤S701缓存连接到基站的MTC移动台的用户标识以及用于与用户标识对应的MTC移动台的数据。这里缓存的用户标识以及与用户标识对应的数据可以是在先前的TTI中获得的。
如上所述，能够被分配给MTC移动台的ID的个数可以为在一个TTI中能够连接到基站的MTC移动台的最大个数。相应地，可根据在一个TTI中能够连接到基站的MTC移动台的最大个数，确定在LTE移动台中缓存用户标识以及数据的缓存器大小。
图8示出了根据本发明的一个示例在LTE移动台中用于缓存的用户标识以及数据的缓存器的示意图。假设在图8所示的示例中，在一个TTI中能够连接到基站的MTC移动台的最大个数为6。在缓存器800中可预先设置存储表，并且其中包含相应于MTC移动台的ID 1-6的条目。在先前TTI中接收到用于ID＝1的MTC移动台的数据aa，接收到用于ID＝2的MTC移动台的数据bb，接收到用于ID＝4的MTC移动台的数据dd,接收到用于ID＝6的MTC移动台的数据ff的情况下，如图8所示，与ID 1对应存储数据aa，与ID 2对应存储数据bb，与ID 4对应存储数据dd，并且与ID 6对应存储数据ff。
返回图7，在步骤S702中，根据从基站通知的当前TTI的移动台标识向量，获得当前TTI中在各个子带上进行数据传输的MTC移动台的用户标识。然后在步骤S703中确定是否存在与所获得的用户标识对应的、缓存的 数据。当存在与所获得的用户标识对应的、缓存的数据时，在步骤S603中可根据所确定的调制方式和码率，对与所获得的用户标识对应的、缓存的数据进行串行干扰消除。另一方面，当不存在与所获得的用户标识对应的、缓存的数据时，在步骤S603中可检测用于与所获得的用户标识对应的MTC移动台的数据；以及根据所确定的调制方式和码率，对与所检测的数据进行串行干扰消除。
例如根据从基站通知的当前TTI的移动台标识向量，获得当前TTI中在各个子带上进行数据传输的MTC移动台的ID为1、2和3。在图8所示的示例中，ID为1和2的MTC移动台的数据被预先缓存，LTE移动台可根据所确定的调制方式和码率，利用缓存数据对用于ID为1和2的MTC移动台的数据进行串行干扰消除。具体地，LTE移动台可首选根据当前TTI的移动台标识向量确定ID为1和2的MTC移动台的数据所占用的SB，并且确定缓存数据是否与所确定的(例如根据步骤S601和S602)、在该SB上的MTC移动台的调制方式和码率对应，并且在缓存数据与所确定的调制方式和码率对应的情况下，进行串行干扰消除。另一方面在缓存数据与所确定的调制方式和码率不对应的情况下，LTE移动台需重新检测在当前TTI中，用于ID为1和2的MTC移动台的数据，并对与所检测的数据进行串行干扰消除。此外，由于ID为3的MTC移动台的数据未被预先缓存，LTE移动台需检测与ID为3对应的MTC移动台传输的数据，并且对与所检测的数据进行串行干扰消除。
优选地，在检测用于与所获得的用户标识对应的MTC移动台的数据之后，可根据所检测的数据更新缓存的数据。
根据图7和图8所示的方案，LTE移动台对应存储MTC移动台的用户标识和数据分组，从而能够使用所存储的数据分组快速地进行串行干扰消除，而不需要在每次发送数据分组时都对该数据分组进行解码等操作。
下面，参照图9来描述根据本发明实施例的基站。图9示出了根据本发明实施例的基站900的框图。如图9所示，基站900包括码率获取单元910、调度向量生成单元920和发送单元930。除了这三个单元以外，基站900还可以包括其他部件，然而，由于这些部件与本发明实施例的内容无关，因此 在这里省略其图示和描述。此外，由于根据本发明实施例的基站900执行的下述操作的具体细节与在上文中参照图1-5描述的细节相同，因此在这里为了避免重复而省略对相同细节的重复描述。
在串行干扰消除时，一移动台需要获取并使用与其配对的其他移动台的调制方式、码率等信息。为了进一步减少所需使用的控制信令，根据本发明实施例，基站900可不向LTE移动台通知MTC移动台的调制方式，并且LTE移动台可通过盲检来确定MTC移动台的调制方式，而基站900可仅通过调度向量向LTE移动台通知MTC移动台的码率。
码率获取单元910获得在当前TTI中、在各个子带上进行数据传输的MTC移动台的码率。然后调度向量生成单元920根据所获得的码率生成公共MTC调度向量。根据本发明的一个示例，可预先对MTC移动台能够使用的各种码率进行编码，以指示相应的码率。调度向量生成单元920可确定与在各个子带上进行数据传输的MTC移动台的码率对应的码字，并且根据各个码字生成公共MTC调度向量。
目前的MTC移动台可使用QPSK、16QAM、64QAM等多种调制方式，并且每种调制方式可具有与该方式对应的多种码率。优选地，基站900还可包括调制方式选择单元，以预先从多个调制方式中选择一部分调制方式作为候选调制方式。MTC移动台在数据传输时使用候选调制方式中的一个调制方式。从而LTE移动台仅需要对被选择为候选调制方式的调制方式进行盲检，简化了LTE移动台进行的盲检操作的复杂度。
此外，基站900还可包括码率选择单元，以预先从每个候选调制方式对应多个码率中选择一部分码率作为候选码率。MTC移动台在数据传输时使用候选码率中的一个码率。从而可进一步减少通知公共MTC调度向量所需使用的控制信令。
发送单元930向连接到基站的所有LTE移动台通知所述公共MTC调度向量。例如，基站可使用无线网络临时标识对公共MTC调度向量加扰，并将加扰后的公共MTC调度向量通知给LTE移动台。在此情况下，基站900还可包括标识生成单元和向量处理单元。
由于发送单元930向所有移动台通知该公共MTC调度向量，而不是如现有的调度向量生成方法那样，生成关于特定移动台的专用调度向量并将该 专用调度向量通知给与该特定移动台配对另一移动台，因此不需要使用移动台特定的无线网络临时标识进行加扰，而是可使用公共的无线网络临时标识进行加扰，并且连接到基站的所有LTE移动台可使用该公共的无线网络临时标识进行解扰。
具体地，标识生成单元可预先生成对于连接到基站的所有LTE移动台的公共MTC无线网络临时标识，并且发送单元可向连接到基站的所有LTE移动台通知该公共MTC无线网络临时标识。调度向量生成单元920生成公共MTC调度向量之后，向量处理单元可通过公共MTC无线网络临时标识对公共MTC调度向量进行加扰，并且发送单元930向连接到基站的所有LTE移动台广播行加扰后的公共MTC调度向量。
在本实施例的基站中，根据在关于当前TTI中、在各个子带上进行数据传输的MTC移动台的码率生成公共MTC调度向量以进行串行干扰消除，而不需要对每个移动台生成单独的调度向量。这使得无线通信系统能够在尽可能小地增加信令开销的情况下，支持NOMA与MTC的组合使用。
此外在本实施例的基站900可不需要包括关于各个移动台的调制方式的信息。另外，考虑到MTC移动台使用窄带进行数据传输，并且所占用频带为连续的资源块，在本实施例的公共MTC调度向量中还可省略关于MTC移动台所占用的频率资源的信息。因而进一步减小了信令开销。
此外，基站900还可向MTC移动台分配用户标识并通知给LTE移动台，以便LTE移动台对接收到的MTC移动台的传输数据信息标识。具体地，基站900还可包括标识分配单元和标识向量生成单元。标识分配单元可对于连接到基站的MTC移动台分配用户标识(ID)。标识向量生成单元可根据在当前TTI中在各个子带上进行数据传输的MTC移动台的用户标识生成移动台标识向量。此外发送单元930还可向连接到基站的所有LTE移动台通知移动台标识向量。
由于在MTC技术相同的数据分组将被重发200-300次，所以通过向MTC移动台分配用户标识并通知给LTE移动台，LTE移动台可对应存储MTC移动台的用户标识和数据分组，以便使用所存储的数据分组快速地进行串行干扰消除，而不需要在每次发送数据分组时都对该数据分组进行解码等操作。
移动台标识向量的大小可与在一个TTI中能够连接到基站的MTC移动台的最大个数相对应。此外，由于MTC采用跳频技术以获得频率增益，在每个TTI中，在各个子带上进行数据传输的MTC移动台可能改变。因此优选地，基站900可在每个TTI生成并通知当前TTI的移动台标识向量。
根据本发明的一个示例，能够被标识分配单元分配给MTC移动台的ID的个数可以为在一个TTI中能够连接到基站的MTC移动台的最大个数。可能存在在当前TTI新连接到基站的MTC移动台。在此情况下，为了避免与分配给已经连接到基站的MTC移动台的ID重复，优选地标识分配单元可对于在当前TTI新连接到基站的MTC移动台分配先前没有被分配过的ID。此外，在所有预定ID均已被分配给MTC移动台，并且在当前TTI存在新连接到基站的MTC移动台的情况下，标识分配单元可将先前与基站连接而在当前TTI不再与基站连接的MTC移动台的ID值分配给新连接到基站的MTC移动台。
下面，参照图10来描述根据本发明一个实施例的LTE移动台。图10示出了根据本发明一个实施例的LTE移动台1000的框图。如图10所示，LTE移动台1000包括调制方式确定单元1010、码率确定单元1020和串行干扰消除单元1030。除了这三个单元以外，LTE移动台1000还可以包括其他部件，然而，由于这些部件与本发明实施例的内容无关，因此在这里省略其图示和描述。此外，由于根据本发明实施例的LTE移动台1000执行的下述操作的具体细节与在上文中参照图6-8描述的细节相同，因此在这里为了避免重复而省略对相同细节的重复描述。
调制方式确定单元1010对与LTE移动台配对的MTC移动台的调制方式进行盲检，以确定与LTE移动台配对的MTC移动台的调制方式。具体地，在NOMA系统中，与LTE移动台配对的MTC移动台为其用于数据传输的频带与LTE移动台用于数据传输的频带重叠的MTC移动台。换言之，在当前TTI中，其下行链路频带与一LTE移动台的下行链路频带重叠的MTC移动台为与该LTE移动台配对的MTC移动台。调制方式确定单元1010可对在其下行链路频带所包含的子带上进行数据传输的MTC移动台的调制方式进行盲检。
此外如上所述，可预先从MTC移动台能够使用的多个调制方式中选择QPSK和16QAM作为候选调制方式，即，MTC移动台的调制方式QPSK和16QAM中的一种。从而调制方式确定单元1010在进行盲检时仅需在QPSK和16QAM这两种调制方式之间确定MTC移动台所使用的调制方式，简化了盲检的复杂性。
码率确定单元1020可根据从基站通知的公共MTC调度向量，确定与LTE移动台配对的MTC移动台的码率，其中公共MTC调度向量包括指示在当前TTI中在各个子带上进行数据传输的MTC移动台的码率信息。根据本发明的一个示例，可先通过调制方式确定单元1010进行盲检，然后通过码率确定单元1020根据所确定的调制方式和公共MTC调度向量，确定与LTE移动台配对的MTC移动台的码率。可替换地，在不需要根据调制方式确定MTC移动台的码率的情况下，也可同时通过调制方式确定单元1010进行盲检并通过码率确定单元1020确定码率。
最后串行干扰消除单元1030根据所确定的调制方式和码率，对用于与LTE移动台配对的MTC移动台的数据进行串行干扰消除。
根据本实施例的LTE移动台通过盲检获得MTC移动台的调制方式，并且通过公共MTC调度向量获得MTC移动台的码率。这使得无线通信系统能够在尽可能小地增加信令开销的情况下，支持NOMA与MTC的组合使用。
此外如上所述，由于在MTC技术相同的数据分组将被重发200-300次，所以LTE移动台可存储对应存储分配给MTC移动台的用户标识和数据分组，以便使用所存储的数据分组快速地进行串行干扰消除，而不需要在每次发送数据分组时都对该数据分组进行解码等操作。
具体地，LTE移动台还可缓存MTC移动台的用户标识和数据以进行快速串行干扰消除。图11示出了根据本发明另一实施例的LTE移动台1100的框图。如图11所示，LTE移动台1100包括分别与调制方式确定单元1010、码率确定单元1020和串行干扰消除单元1030类似的调制方式确定单元1110、码率确定单元1120和串行干扰消除单元1130。此外，LTE移动台1100还包括缓存单元1140、标识获取单元1150和数据确定单元1160。
具体地，缓存单元1140缓存连接到基站的MTC移动台的用户标识以及用于与用户标识对应的MTC移动台的数据。这里缓存的用户标识以及与用 户标识对应的数据可以是在先前的TTI中获得的。
如上所述，能够被分配给MTC移动台的ID的个数可以为在一个TTI中能够连接到基站的MTC移动台的最大个数。相应地，可根据在一个TTI中能够连接到基站的MTC移动台的最大个数，确定在LTE移动台中缓存用户标识以及数据的缓存器大小。
标识获取单元1150根据从基站通知的当前TTI的移动台标识向量，获得当前TTI中在各个子带上进行数据传输的MTC移动台的用户标识。然后数据确定单元1160确定是否存在与所获得的用户标识对应的、缓存的数据。当存在与所获得的用户标识对应的、缓存的数据时，串行干扰消除单元1130可根据所确定的调制方式和码率，对与所获得的用户标识对应的、缓存的数据进行串行干扰消除。另一方面，当不存在与所获得的用户标识对应的、缓存的数据时，串行干扰消除单元1130可检测用于与所获得的用户标识对应的MTC移动台的数据；以及根据所确定的调制方式和码率，对与所检测的数据进行串行干扰消除。
优选地，缓存单元1140可在检测用于与所获得的用户标识对应的MTC移动台的数据之后，可根据所检测的数据更新缓存的数据。
根据图11所示的方案，LTE移动台对应存储MTC移动台的用户标识和数据分组，从而能够使用所存储的数据分组快速地进行串行干扰消除，而不需要在每次发送数据分组时都对该数据分组进行解码等操作。
上述基站900和LTE移动台1000、1100的操作可以通过硬件实现，也可以通过由处理器执行的软件模块实现，并且进一步可以通过两者的组合实现。
软件模块可以被布置在任意格式的存储介质中，例如RAM(随机访问存储器)、闪存、ROM(只读存储器)、EPROM(可擦除可编程ROM)、EEPROM(电可擦除可编程ROM)、寄存器、硬盘、可移除盘以及CD-ROM。
这种存储介质连接到处理器，使得处理器可以向该存储介质写入信息或从该存储介质读取信息。这种存储介质还可以在处理器中累积。这种存储介质和处理器可以被布置在ASIC中。这种ASIC可以被布置在基站900和LTE移动台1000、1100中。作为分立组件，这种存储介质和处理器可以被布置 在基站900和LTE移动台1000、1100中。
因此，通过使用上述实施例详细解释了本发明；然而，本领域技术人员应清楚本发明不限于在理解释的实施例。本发明在不背离由权利要求限定的本发明的范围的情况下可以被实现为校正的、修改的模式。因此，说明书的描述仅意图解释示例，并且不对本发明施加任何限制含义。

Claims (20)

  1. 一种由基站执行的调度向量生成方法，包括：
    获得在当前传输时间间隔(TTI)中在各个子带上进行数据传输的机器类型通信(MTC)移动台的码率；
    根据所获得的码率生成公共MTC调度向量；
    向连接到所述基站的所有LTE移动台通知所述公共MTC调度向量。
  2. 如权利要求1所述的方法，还包括：
    预先从多个调制方式中选择一部分调制方式作为候选调制方式，其中
    所述MTC移动台在数据传输时使用候选调制方式中的一个调制方式。
  3. 如权利要求2所述的方法，还包括：
    预先从所述候选调制方式对应多个码率中选择一部分码率作为候选码率,其中
    所述MTC移动台在数据传输时使用候选码率中的一个码率。
  4. 如权利要求1所述的方法，还包括：
    生成对于连接到所述基站的所有LTE移动台的公共MTC无线网络临时标识；
    向连接到所述基站的所有LTE移动台通知所述公共MTC无线网络临时标识；
    通过所述公共MTC无线网络临时标识对所述公共MTC调度向量进行加扰，其中
    所述向连接到所述基站的所有LTE移动台通知所述公共MTC调度向量包括：
    向连接到所述基站的所有LTE移动台广播行加扰后的公共MTC调度向量。
  5. 如权利要求1所述的方法，还包括：
    对于连接到所述基站的MTC移动台分配用户标识；
    根据在当前TTI中在各个子带上进行数据传输的MTC移动台的用户标识生成移动台标识向量；以及
    向连接到所述基站的所有LTE移动台通知所述移动台标识向量。
  6. 一种由LTE移动台执行的串行干扰消除方法，包括：
    对与所述LTE移动台配对的机器类型通信(MTC)移动台的调制方式进行盲检，以确定与所述LTE移动台配对的MTC移动台的调制方式；
    根据从基站通知的公共MTC调度向量，确定与所述LTE移动台配对的MTC移动台的码率，其中所述公共MTC调度向量包括指示在当前TTI中在各个子带上进行数据传输的MTC移动台的码率信息；以及
    根据所确定的调制方式和码率，对用于与所述LTE移动台配对的MTC移动台的数据进行串行干扰消除。
  7. 如权利要求6所述的方法，还包括：
    缓存连接到所述基站的MTC移动台的用户标识以及用于与用户标识对应的MTC移动台的数据；
    根据从基站通知的移动台标识向量，获得当前TTI中在各个子带上进行数据传输的MTC移动台的用户标识；
    确定是否存在与所获得的用户标识对应的、缓存的数据，其中
    当存在与所获得的用户标识对应的、缓存的数据时，所述根据所确定的调制方式和码率，对用于与所述LTE移动台配对的MTC移动台的数据进行串行干扰消除包括：
    根据所确定的调制方式和码率，对与所获得的用户标识对应的、缓存的数据进行串行干扰消除。
  8. 如权利要求7所述的方法，还包括：
    当不存在与所获得的用户标识对应的、缓存的数据时，所述根据所确定的调制方式和码率，对用于与所述LTE移动台配对的MTC移动台的数据进行串行干扰消除包括：
    检测用于与所获得的用户标识对应的MTC移动台的数据；
    根据所确定的调制方式和码率，对与所检测的数据进行串行干扰消除。
  9. 如权利要求8所述的方法，还包括：
    在检测用于与所获得的用户标识对应的MTC移动台的数据之后，根据所检测的数据更新缓存的数据。
  10. 如权利要求7所述的方法，其中
    根据在一个TTI中能够连接到所述基站的MTC移动台的最大个数，确定在所述LTE移动台中缓存用户标识以及数据的缓存器大小；以及
    所述移动台标识向量的大小与在一个TTI中能够连接到所述基站的MTC移动台的最大个数相对应。
  11. 一种基站，包括：
    码率获取单元，配置为获得在当前传输时间间隔(TTI)中在各个子带上进行数据传输的机器类型通信(MTC)移动台的码率；
    调度向量生成单元，配置为根据所获得的码率生成公共MTC调度向量；
    发送单元，配置为向连接到所述基站的所有LTE移动台通知所述公共MTC调度向量。
  12. 如权利要求11所述的基站，还包括：
    调制方式选择单元，配置为预先从多个调制方式中选择一部分调制方式作为候选调制方式，其中
    所述MTC移动台在数据传输时使用候选调制方式中的一个调制方式。
  13. 如权利要求12所述的基站，还包括：
    码率选择单元，配置为预先从所述候选调制方式对应多个码率中选择一部分码率作为候选码率；
    所述MTC移动台在数据传输时使用候选码率中的一个码率。
  14. 如权利要求11所述的基站，还包括：
    标识生成单元，配置为生成对于连接到所述基站的所有LTE移动台的公共MTC无线网络临时标识；
    向量处理单元，配置为通过所述公共MTC无线网络临时标识对所述公共MTC调度向量进行加扰，其中
    所述发送单元向连接到所述基站的所有LTE移动台广播行加扰后的公共MTC调度向量，并且向连接到所述基站的所有LTE移动台通知所述公共MTC无线网络临时标识。
  15. 如权利要求11所述的基站，还包括：
    标识分配单元，配置为对于连接到所述基站的MTC移动台分配用户标识；
    标识向量生成单元，配置为根据在当前TTI中在各个子带上进行数据传 输的MTC移动台的用户标识生成移动台标识向量，其中
    所述发送单元还配置为向连接到所述基站的所有LTE移动台通知所述移动台标识向量。
  16. 一种LTE移动台包括：
    调制方式确定单元，配置为对与所述LTE移动台配对的机器类型通信(MTC)移动台的调制方式进行盲检，以确定与所述LTE移动台配对的MTC移动台的调制方式；
    码率确定单元，配置为根据从基站通知的公共MTC调度向量，确定与所述LTE移动台配对的MTC移动台的码率，其中所述公共MTC调度向量包括指示在当前TTI中在各个子带上进行数据传输的MTC移动台的码率信息；以及
    串行干扰消除单元，配置为根据所确定的调制方式和码率，对用于与所述LTE移动台配对的MTC移动台的数据进行串行干扰消除。
  17. 如权利要求16所述的移动台，还包括：
    缓存单元，配置为缓存连接到所述基站的MTC移动台的用户标识以及用于与用户标识对应的MTC移动台的数据；
    标识获取单元，配置为根据从基站通知的移动台标识向量，获得当前TTI中在各个子带上进行数据传输的MTC移动台的用户标识；
    数据确定单元，配置为确定是否存在与所获得的用户标识对应的、缓存的数据，其中
    当存在与所获得的用户标识对应的、缓存的数据时，所述串行干扰消除单元根据所确定的调制方式和码率，对与所获得的用户标识对应的、缓存的数据进行串行干扰消除。
  18. 如权利要求17所述的移动台，还包括：
    检测单元，配置为当不存在与所获得的用户标识对应的、缓存的数据时，检测用于与所获得的用户标识对应的MTC移动台的数据，其中
    所述串行干扰消除单元根据所确定的调制方式和码率，对与所检测的数据进行串行干扰消除。
  19. 如权利要求18所述的移动台，其中
    所述缓存单元在检测用于与所获得的用户标识对应的MTC移动台的数 据之后，根据所检测的数据更新缓存的数据。
  20. 如权利要求17所述的移动台，其中
    根据在一个TTI中能够连接到所述基站的MTC移动台的最大个数，确定所述缓存单元中存储空间的大小；以及
    所述移动台标识向量的大小与在一个TTI中能够连接到所述基站的MTC移动台的最大个数相对应。
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CN105027584A (zh) * 2013-03-04 2015-11-04 高通股份有限公司 Mtc设备关联方案
CN105144812A (zh) * 2013-03-25 2015-12-09 富士通株式会社 无线通信系统、基站、无线通信装置以及无线通信方法

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* Cited by examiner, † Cited by third party
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CN105027584A (zh) * 2013-03-04 2015-11-04 高通股份有限公司 Mtc设备关联方案
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