WO2017125003A1 - 比特到符号的映射方法和基站 - Google Patents

比特到符号的映射方法和基站 Download PDF

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Publication number
WO2017125003A1
WO2017125003A1 PCT/CN2017/071402 CN2017071402W WO2017125003A1 WO 2017125003 A1 WO2017125003 A1 WO 2017125003A1 CN 2017071402 W CN2017071402 W CN 2017071402W WO 2017125003 A1 WO2017125003 A1 WO 2017125003A1
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WIPO (PCT)
Prior art keywords
bit information
mobile stations
base station
mapping
symbol
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PCT/CN2017/071402
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English (en)
French (fr)
Inventor
严春林
兰洋
李安新
蒋惠玲
Original Assignee
株式会社Ntt都科摩
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 株式会社Ntt都科摩 filed Critical 株式会社Ntt都科摩
Priority to JP2018536838A priority Critical patent/JP2019508935A/ja
Priority to CN201780004336.7A priority patent/CN108702713A/zh
Publication of WO2017125003A1 publication Critical patent/WO2017125003A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria

Definitions

  • the present invention relates to a bit-to-symbol mapping method and base station performed by a base station. More particularly, the present invention relates to a bit-to-symbol mapping method and corresponding base station employed when simultaneously modulating a plurality of mobile stations.
  • Non-Orthogonal Multiple Access is a wireless access technology proposed in the LTE (Long Term Evolution) release 13 studied by the 3GPP (3rd Generation Partnership Project).
  • 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, so that the plurality of mobile stations share the same time and frequency resources, thereby improving the system. Throughput.
  • a base station maps bit information of a plurality of mobile stations scheduled at the same time onto a symbol according to a specific modulation scheme.
  • the base station allocates a high priority bit of a symbol in a specific modulation mode for bit information of a mobile station having a poor channel state, and The bit information of the mobile station having a better channel state is assigned a low priority bit of the symbol in a specific modulation scheme.
  • such a mapping method may result in poor signal quality of the mobile station receiving the channel state from the base station, resulting in a decrease in the overall throughput of the communication system.
  • a bit-to-symbol mapping method performed by a base station, comprising: for modulating a plurality of mobile stations simultaneously scheduled by a base station, for a first one of the plurality of mobile stations The first portion of the bit information is mapped to the high priority bits in the symbol; and the second portion of the bit information for the first mobile station is mapped to the low priority bits of the symbol.
  • a base station comprising: a first mapping unit configured to, when modulating a plurality of mobile stations simultaneously scheduled by a base station, for a first one of the plurality of mobile stations The first portion of the bit information is mapped to the high priority bits in the symbol; and the second A mapping unit is configured to map the second partial bit information for the first mobile station to the low priority bits in the symbol.
  • FIG. 1 is a schematic diagram showing a NOMA communication system in accordance with one embodiment of the present invention.
  • FIG. 2 is a diagram showing bit-to-symbol mapping in a 16QAM modulation mode according to a conventional mapping method.
  • FIG. 3 is a flow chart showing a bit-to-symbol mapping method performed by a base station according to an embodiment of the present invention.
  • FIG. 4 is a diagram showing bit-to-symbol mapping in a 16QAM modulation mode, according to an example of the present invention.
  • FIG. 5 is a diagram showing bit-to-symbol mapping in a 16QAM modulation mode according to another example of the present invention.
  • FIG. 6 is a diagram showing the first mobile station and the second mobile station received in the case where the base station adjusts the first mobile station and the second mobile station that are scheduled together using the 64QAM method in the white Gaussian noise channel. The simulation result of the signal.
  • Figure 7 shows a block diagram of a base station in accordance with an embodiment of the present invention.
  • FIG. 8 is a general hardware block diagram showing a system for mapping bits to symbols in accordance with an embodiment of the present invention.
  • bit-to-symbol mapping method and a base station performed by a base station will be described below with reference to the accompanying drawings.
  • the same reference numerals are used to refer to the same elements. It is to be understood that the embodiments described herein are illustrative only and are not intended to limit the scope of the invention.
  • the wireless communication system shown in Figure 1 includes a base station and a plurality of user equipments (UEs) in communication with the base station.
  • the base station can be connected to an upper device (not shown), which in turn can To connect to the core network (not shown).
  • UEs user equipments
  • the core network not shown.
  • 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.
  • the base station schedules each UE for each downlink resource block (e.g., a frequency resource block) to decide which data to use for multiplexing to which UEs. For example, the base station may perform the above scheduling according to channel state information (CSI) that is fed back from each UE and reflects the radio channel condition between the UE and the base station.
  • CSI channel state information
  • the base station can multiplex data for UE1 and UE2 in the same resource block.
  • the base station can transmit data for UE1 at a first power level (or first power) and can transmit data for UE2 through a second power level (or second power) different from the first power level
  • the UE1 is, for example, a UE that is close to the base station or located at the center of the cell
  • the UE2 is, for example, a UE that is far from the base station or located at the edge of the cell.
  • FIG. 2 shows a schematic diagram of symbols in a 16QAM modulation scheme. As shown in FIG. 2, each symbol of 16QAM includes 4 bits, wherein each symbol includes 2 high priority bits (shown by white squares in FIG. 2) and 2 low priority bits (as shown in FIG. 2). The gray box in 2).
  • F denotes a bit for UE2 in the modulated symbol
  • N denotes a bit for UE1 in the modulated symbol.
  • Embodiments of the present invention improve the above bit-to-symbol mapping method.
  • embodiments of the present invention will be described with reference to the drawings.
  • FIG. 3 is a flow diagram showing a bit-to-symbol mapping method 300 performed by a base station in accordance with an embodiment of the present invention.
  • step S301 when modulating a plurality of mobile stations simultaneously scheduled by the base station, mapping the first partial bit information of the first mobile station among the plurality of mobile stations to the high priority in the symbol Bit.
  • a plurality of mobile stations that are scheduled together by a base station may have different signal-to-interference ratios (hereinafter simply referred to as signal to interference ratios), and the first shift
  • the mobile station may be a mobile station having a higher signal to interference ratio among the plurality of mobile stations.
  • the first mobile station may have a better channel state and may be a mobile station located at the center of the cell.
  • the priority may be determined based on the transmission reliability of the bits in the modulation symbol. Specifically, the information transmission reliability of the high priority bits in the symbols is higher than the information transmission reliability of the low priority bits in the symbols.
  • the first part of the bit information may be part of the bit information selected from all of the bit information for the first mobile station.
  • the base station may modulate bit information of a plurality of mobile stations scheduled together in a plurality of modulation manners, and may determine a first partial bit to be mapped to a high priority bit in the symbol according to a modulation manner of the base station for the plurality of mobile stations.
  • the number of first partial bit information for each modulation mode may be predetermined by coded modulation and channel condition simulation for a plurality of UEs scheduled together.
  • the number of first partial bit information in each modulation mode may be predetermined such that the geometric average throughput of the plurality of UEs scheduled in the modulation mode is maximized or other metrics are optimal.
  • more bit information may be selected from the bit information for the first mobile station than when the base station uses 16QAM to modulate a plurality of mobile stations as the first partial bit information.
  • the first partial bit information can be mapped to high priority bits in the symbol in different ways.
  • the first partial bit information may be mapped to high priority bits in the symbol at predetermined intervals in step S301.
  • the first partial bit information may also be mapped to consecutively distributed high priority bits in the symbol in step S301. Similar to determining the first partial bit information, the mapping mode can be determined according to the modulation scheme of the base station for a plurality of mobile stations.
  • FIG. 4 is a diagram showing bit-to-symbol mapping in a 16QAM modulation mode, according to an example of the present invention. Similar to FIG. 2, the white squares in FIG. 4 represent high priority bits in the symbols, and the gray squares represent low priority bits in the symbols. As shown in FIG. 4, the high priority bits in the modulated symbols are sequentially arranged in the time direction.
  • the mapping interval of the first partial bit information may be set to a high priority bit in advance. Accordingly, when mapping according to step S301, the first partial bit information is mapped onto the high priority bits every high priority bit.
  • N denotes a bit for the first mobile station in the modulated symbol
  • F denotes a used for the other mobile stations other than the first mobile station among the plurality of mobile stations in the modulated symbol. Bit.
  • the first partial bit information of the first mobile station is mapped to the high priority bits every interval of a high priority bit.
  • FIG. 5 is a diagram showing bit-to-symbol mapping in a 16QAM modulation mode according to another example of the present invention.
  • the high priority bits in the modulated symbols are sequentially arranged in the time direction.
  • the starting position and length (i.e., the number of bits) of the first partial bit information to be mapped to in the sequentially arranged high priority bits may be predetermined.
  • the first partial bit information is mapped onto the sequentially arranged high priority bits of a predetermined length starting from a preset starting position.
  • N denotes a bit for the first mobile station in the modulated symbol
  • F denotes a used signal for the other mobile stations other than the first mobile station among the plurality of mobile stations in the modulated symbol Bit.
  • the first partial bit information of the first mobile station is mapped to a high priority of a predetermined length starting from the first high priority bit. On the level bits.
  • the first partial bit information determination manner and mapping manner of the first mobile station may be stored in advance in the base station scheduling and the plurality of mobile stations.
  • step S301 according to the first partial bit information determining manner stored in advance, when the plurality of mobile stations scheduled by the base station are modulated, the first partial bit information of the first mobile station is determined, and according to the pre-stored mapping manner.
  • the determined first partial bit information is mapped to high priority bits in the symbol.
  • the modulation and coding scheme MCS
  • the stored plurality of first and second partial bit information determining manners and mapping manners may be selected and selected.
  • the first part bit information determining mode and mapping mode corresponding to the current modulation mode of the plurality of mobile stations by the base station.
  • the base station can also adjust the first partial bit information determination and mapping manner of the first mobile station statically or semi-statically.
  • the method in FIG. 3 may further include obtaining a first partial bit information determination and mapping manner of the first mobile station according to channel qualities of the plurality of mobile stations, and before modulating the plurality of mobile stations simultaneously scheduled by the base station, A plurality of mobile stations notify the determined and mapped manners obtained.
  • the base station may obtain the first partial bit information determination and mapping manner of the first mobile station according to channel qualities of the plurality of mobile stations, so that the throughput of the plurality of mobile stations scheduled together by the base station is maximized.
  • the throughput of the plurality of mobile stations can be considered to be the largest.
  • the first partial bit information determination and mapping manner of the first mobile station can be obtained from channel state indications (CSI) received from a plurality of mobile stations.
  • CSI channel state indications
  • determining the first partial bit information from all of the bit information for the first mobile station may include determining the number of first partial bit information.
  • the number of first partial bit information is determined from all of the bit information for the first mobile station based on the CSI received from the plurality of mobile stations.
  • the first partial bit information is mapped to high priority bits in the symbol in different ways, and a mapping manner suitable for the channel quality can be obtained according to channel qualities of the plurality of mobile stations.
  • the base station may provide multiple to the radio resource control signaling or the physical downlink control channel.
  • the mobile station notifies the obtained determination and mapping manner, and in step S301, according to the obtained determination and mapping manner, when modulating a plurality of mobile stations simultaneously scheduled by the base station, the first movement for the plurality of mobile stations
  • the first portion of the station's bit information is mapped to the high priority bits in the symbol.
  • the second partial bit information for the first mobile station is mapped to the low priority bits in the symbol.
  • the second partial bit information may be bit information other than the first partial bit information among all bit information for the first mobile station. As shown in Figures 4 and 5, the second portion of the bit information of the first mobile station is mapped onto the low priority bits in the symbol.
  • the method illustrated in FIG. 3 may further include mapping all bit information for the second one of the plurality of mobile stations to a high in the symbol when modulating a plurality of mobile stations simultaneously scheduled by the base station Priority bit.
  • the second mobile station may be a mobile station having a lower signal to interference ratio among the plurality of mobile stations.
  • the second mobile station can be a mobile station located at the edge of the cell. Since the channel quality of the mobile station located at the cell edge is generally lower than the channel quality of the mobile station located at the cell center, the second can be ensured by mapping all bit information for the second mobile station to the high priority bits in the symbol. The communication quality of the mobile station.
  • the method illustrated in FIG. 3 may further include adjusting transmit power allocated to a plurality of mobile stations to further increase throughput rates of the plurality of mobile stations.
  • the base station can adjust the proportion of the transmission power allocated to the first mobile station and the transmission power allocated to the second mobile station in the total transmission power of the base station.
  • the method illustrated in FIG. 3 may be used for a base station that performs bit information to symbol mapping for multiple mobile stations using Multicast Overlay Type 2 (MUST Category 2).
  • MUST Category 2 Multicast Overlay Type 2
  • bit-to-symbol mapping method it is effective to map a part of bit information of a first mobile station among a plurality of mobile stations scheduled by a base station to a high priority bit in a modulated symbol.
  • the signal quality received by the first mobile station from the base station is improved to ensure the throughput of the entire communication system.
  • FIG. 6 is a diagram showing a first mobile station and a second mobile in a case where a base station adjusts a first mobile station and a second mobile station that are scheduled together in a 64QAM mode in a white Gaussian noise channel.
  • the simulation result of the signal received by the station It is assumed that in the example shown in FIG. 6, the first mobile station and the second mobile station are encoded at a coding rate of 0.65, and 20 resource blocks are simulated.
  • the mapping method 300 compared with the conventional mapping method, significantly improves the signal quality received by the first mobile station, and affects the signal quality received by the second mobile station. Smaller. For example, as shown in FIG.
  • mapping the first partial bit information for the first mobile station to the high priority bits in the symbol can be performed simultaneously (step S301), mapping the second partial bit information for the first mobile station to the low priority in the symbol Bits (step S302), and mapping all bit information for the second of the plurality of mobile stations to the high priority bits in the symbol.
  • FIG. 7 shows a block diagram of a base station 700 in accordance with an embodiment of the present invention.
  • the base station 700 includes a first mapping unit 710 and a second mapping unit 720.
  • the base station 700 may include other components in addition to these two 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.
  • the specific details of the operations described below performed by the base station 700 according to the embodiment of the present invention are the same as those described above with reference to FIGS. 1-6, repeated description of the same details is omitted herein to avoid redundancy.
  • the first mapping unit 710 may map the first partial bit information for the first one of the plurality of mobile stations to the high priority bits in the symbol when modulating the plurality of mobile stations that are simultaneously scheduled by the base station.
  • a plurality of mobile stations that are scheduled together by a base station may have different signal to interference ratios, and the first mobile station may be a mobile station having a higher signal to interference ratio among the plurality of mobile stations.
  • the first mobile station may have a better channel state and may be a mobile station located at the center of the cell.
  • the priority may be determined based on the transmission reliability of the bits in the modulation symbol. Specifically, the information transmission reliability of the high priority bits in the symbols is higher than the information transmission reliability of the low priority bits in the symbols.
  • the first part of the bit information may be part of the bit information selected from all of the bit information for the first mobile station.
  • the base station may modulate bit information of a plurality of mobile stations that are scheduled together in a plurality of modulation manners, and the first mapping unit 710 may perform a plurality of mobile stations according to the base station.
  • the modulation is used to determine the amount of first portion of bit information that will be mapped to the high priority bits in the symbol.
  • the first mapping unit 710 may select more bit information from the bit information for the first mobile station than when the base station uses 16QAM to modulate the plurality of mobile stations. As the first part of the bit information.
  • the first partial bit information can be mapped to high priority bits in the symbol in different ways.
  • the first mapping unit 710 can map the first partial bit information to high priority bits in the symbol at predetermined intervals.
  • the first mapping unit 710 can also map the first partial bit information to consecutively distributed high priority bits in the symbol. Similar to determining the first partial bit information, the first mapping unit 710 can determine the mapping manner according to the modulation manner of the base station for the plurality of mobile stations.
  • FIG. 4 is a diagram showing bit-to-symbol mapping in a 16QAM modulation mode, according to an example of the present invention. Similar to FIG. 2, the white squares in FIG. 4 represent high priority bits in the symbols, and the gray squares represent low priority bits in the symbols. As shown in FIG. 4, the high priority bits in the modulated symbols are sequentially arranged in the time direction.
  • the mapping interval of the first partial bit information may be set to a high priority bit in advance.
  • the first mapping unit 710 maps the first partial bit information onto the high priority bits every high priority bit when performing the mapping. For example, in the example shown in FIG. 4 above, among the high priority bits sequentially arranged in the time direction, the first partial bit information of the first mobile station is mapped by the first mapping unit 710 to the high of each high priority bit. Priority bit.
  • the starting position and length (i.e., the number of bits) of the first partial bit information to be mapped to among the sequentially arranged high priority bits may be predetermined.
  • the first mapping unit 710 maps the first partial bit information onto a predetermined length of high priority bits of a predetermined length starting from a preset starting position. For example, in the example shown in FIG. 5, among the high priority bits sequentially arranged in the time direction, the first partial bit information of the first mobile station is mapped by the first mapping unit 710 to start from the first high priority bit, Sequenced, high-priority bits of predetermined length.
  • the base station 700 may further include a storage unit to store the first partial bit information determining manner and mapping manner of the first mobile station in the base station scheduling and the plurality of mobile stations in advance.
  • the first mapping unit 710 may determine, according to the first partial bit information determining manner stored in advance, the first partial bit information of the first mobile station when modulating a plurality of mobile stations that are simultaneously scheduled by the base station, and according to a pre-stored mapping manner.
  • the determined first partial bit information is mapped to high priority bits in the symbol.
  • the modulation coding method (MCS) and the first part can be pre-processed.
  • the bit-wise information determining manner and the mapping mode are correspondingly stored in the storage unit of the base station.
  • the first mapping unit 710 may select a first partial bit information determining manner and a mapping manner corresponding to a current modulation manner of the plurality of mobile stations by the base station from the stored plurality of first partial bit information determining manners and mapping manners.
  • base station 700 can also statically or semi-statically adjust the first portion of the bit information determination and mapping mode of the first mobile station.
  • the base station 700 may further include a mode determining unit to obtain a first partial bit information determination and mapping manner of the first mobile station according to channel qualities of the plurality of mobile stations; and a transmitting unit to perform a plurality of movements simultaneously scheduled by the base station Before the station performs modulation, the plurality of mobile stations are notified of the obtained determination and mapping manner.
  • the mode determining unit may obtain the first partial bit information determination and mapping manner of the first mobile station according to the channel quality of the plurality of mobile stations, so that the throughput of the plurality of mobile stations that are scheduled together by the base station is maximized. For example, when the geometric mean of the throughput of the plurality of mobile stations is the largest, the throughput of the plurality of mobile stations can be considered to be the largest. More specifically, the mode determining unit may obtain the first partial bit information determination and mapping manner of the first mobile station based on channel state indications (CSI) received from the plurality of mobile stations.
  • CSI channel state indications
  • the sending unit may use the radio resource control signaling or the physical downlink control channel to The mobile station notifies the obtained determination and mapping manner, and the first mapping unit 710 can perform the modulation for the plurality of mobile stations that are simultaneously scheduled by the base station according to the obtained determination and mapping manner.
  • the first portion of the bit information of a mobile station is mapped to the high priority bits in the symbol.
  • the second mapping unit 720 can map the second partial bit information for the first mobile station to the low priority bits in the symbol.
  • the second partial bit information may be bit information other than the first partial bit information among all bit information for the first mobile station. As shown in Figures 4 and 5, the second portion of the bit information of the first mobile station is mapped onto the low priority bits in the symbol.
  • the base station 700 may further include a third mapping unit to map all bit information for the second mobile station of the plurality of mobile stations into the symbol when modulating the plurality of mobile stations simultaneously scheduled by the base station High priority bit.
  • the second mobile station may be a mobile station having a lower signal to interference ratio among the plurality of mobile stations.
  • the second mobile station can be a mobile station located at the edge of the cell. Since the channel quality of the mobile station located at the cell edge is generally lower than the channel quality of the mobile station located at the cell center, the second can be ensured by mapping all bit information for the second mobile station to the high priority bits in the symbol. The communication quality of the mobile station.
  • the base station 700 may further include a power adjustment unit to adjust transmission power allocated to the plurality of mobile stations to further increase throughput rates of the plurality of mobile stations.
  • the power adjustment unit may adjust the proportion of the transmission power allocated to the first mobile station and the transmission power allocated to the second mobile station in the total transmission power of the base station.
  • the base station 700 can be used for a base station that performs bit information to symbol mapping for a plurality of mobile stations using Multi-User Overlay Type 2 (MUST Category 2).
  • MUST Category 2 Multi-User Overlay Type 2
  • the first one is effectively improved by mapping a part of bit information of the first mobile station among the plurality of mobile stations scheduled by the base station to the high priority bits in the modulated symbols.
  • the quality of the signal received by the mobile station from the base station to ensure the throughput of the entire communication system.
  • the present invention can be implemented as a system, apparatus, method, or computer program product. Therefore, the present invention may be embodied in the following forms, that is, it may be complete hardware, or may be complete software (including firmware, resident software, microcode, etc.), or may be a combination of hardware and software.
  • the invention is also referred to as "component,” “module,” “device,” or “system.” Further, in some embodiments, the invention can also be embodied in the form of a computer program product in one or more computer readable medium(s)
  • the readable medium contains computer readable program code.
  • the computer readable medium can be a computer readable signal medium or a computer readable storage medium.
  • the computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive lists) of computer readable storage media include: electrical connections having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read only memory (ROM), Erasable programmable read only memory (EPROM or flash memory), optical fiber, portable compact disk read only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the foregoing.
  • a computer readable storage medium can be any tangible medium that can contain or store a program, which can be used by or in connection with an instruction execution system, apparatus or device.
  • a computer readable signal medium may include a data signal that is propagated in the baseband or as part of a carrier, carrying computer readable program code. Such propagated data signals can take a variety of forms including, but not limited to, electromagnetic signals, optical signals, or any suitable combination of the foregoing.
  • the computer readable signal medium can also be any computer readable medium other than a computer readable storage medium, which can be transmitted, propagated or transmitted for use by or in connection with an instruction execution system, apparatus or device. program.
  • each block of the flowchart or block diagram can represent a module, a program segment, or a portion of code that includes one or more of the Executable instructions. It is also noted that each block of the block diagrams and/or flowcharts, and combinations of blocks in the block diagrams and/or flowcharts, can be implemented in a dedicated hardware-based system that performs the specified function or operation. Or it can be implemented by a combination of dedicated hardware and computer instructions.
  • FIG. 8 is a general hardware block diagram showing a bit-to-symbol mapping system 800 in accordance with an embodiment of the present invention.
  • the bit-to-symbol mapping system 800 can be implemented as a base station, and as shown in FIG. 8, the bit-to-symbol mapping system 800 can include a receive transmitting component 810, a storage component 820, and a processing component 830.
  • Receive and transmit component 810 can receive/transmit signals from the mobile station.
  • Storage component 820 can include various forms of computer readable storage media such as volatile memory and/or nonvolatile memory.
  • the volatile memory may include, for example, a random access memory (RAM) and/or a cache or the like.
  • the nonvolatile memory may include, for example, a read only memory (ROM), a hard disk, a flash memory, or the like.
  • One or more computer program instructions can be stored on the computer readable storage medium.
  • storage component 820 can store computer program instructions that implement the bit-to-symbol mapping method described above in connection with Figures 1-6.
  • the processor 830 can execute the program instructions to implement the functions of the embodiments of the present disclosure described above and/or other desired functions.

Abstract

本发明实施例提供了一种基站执行的比特到符号的映射方法和基站。根据本发明一个实施例的一种由基站执行的比特到符号的映射方法，包括：在对同时被基站调度的多个移动台进行调制时，将对于多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特；以及将对于第一移动台的第二部分比特信息映射到符号中的低优先级比特。

Description

比特到符号的映射方法和基站 技术领域
本发明涉及由基站执行的比特到符号的映射方法和基站。更具体地，本发明涉及一种对多个移动台同时进行调制时采用的比特到符号的映射方法和相应的基站。
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，以使得该多个移动台共享相同的时间和频率资源，从而提高系统吞吐量。
在NOMA系统中，基站根据特定的调制方式，将同时调度的多个移动台各自的比特信息映射到符号上。目前在上述比特到符号映射的过程中，为了确保信道状态较差的移动台的通信质量，基站对于信道状态较差的移动台的比特信息分配在特定调制方式中符号的高优先级比特，并且对于信道状态较好的移动台的比特信息分配在特定调制方式中符号的低优先级比特。然而这样的映射方式可能导致信道状态较好的移动台从基站接收到的信号质量较差，造成通信系统的整体吞吐量降低。
发明内容
根据本发明希望提供一种比特到符号的映射方法和相应的基站，以有效地改善信道状态较好的移动台从基站接收到的信号质量，从而确保整个通信系统的吞吐量。
根据本发明的一个方面，提供了一种由基站执行的比特到符号的映射方法，包括：在对同时被基站调度的多个移动台进行调制时，将对于多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特；以及将对于第一移动台的第二部分比特信息映射到符号中的低优先级比特。
根据本发明的另一个方面，提供了一种基站，包括：第一映射单元，被配置为在对同时被基站调度的多个移动台进行调制时，将对于多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特；以及第二 映射单元，被配置为将对于第一移动台的第二部分比特信息映射到符号中的低优先级比特。
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，其中：
图1是示出了根据本发明一个实施例的NOMA通信系统的示意图。
图2是示出的了根据传统的映射方法，在16QAM调制方式下进行比特到符号映射的示意图。
图3是示出了根据本发明的实施例的由基站执行的比特到符号的映射方法的流程图。
图4是示出的了根据本发明的一个示例，在16QAM调制方式下进行比特到符号映射的示意图。
图5是示出的了根据本发明的另一示例，在16QAM调制方式下进行比特到符号映射的示意图。
图6是示出了在高斯白噪声信道中，在基站使用64QAM方式对一起调度的第一移动台和第二移动台进行调整的情况下，对第一移动台和第二移动台接收到的信号的仿真结果。
图7示出了根据本发明实施例的基站的框图。
图8是示出按照本发明实施例的将比特映射到符号的系统的总体硬件框图。
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由基站执行的比特到符号的映射方法和基站。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。
首先，参照图1描述可以应用本发明的实施例的NOMA无线通信系统的一个示例。图1所示的无线通信系统包括基站和与该基站通信的多个用户设备(UE)。基站可以与上层装置(图中未示出)连接，该上层装置继而可 以连接到核心网络(图中未示出)。应当注意，尽管在图1中仅示出了一个基站和两个UE，但这只是示例性的，根据需要，可以存在更多或更少的基站和UE。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。
基站对于每个下行链路资源块(例如频率资源块)，对各个UE进行调度，以便决定将用于哪些UE的数据复用到该资源块中。例如，基站可以根据从各个UE反馈的反映UE与基站之间的无线信道状况的信道状态信息(CSI)来进行上述调度。在图1所示的示例中，基站可以将用于UE1和UE2的数据复用在同一资源块中。此外，基站可以通过以第一功率级(或第一功率)发送用于UE1的数据，并且可以通过不同于第一功率级的第二功率级(或第二功率)发送用于UE2的数据，其中UE1例如为距基站近或位于小区中心的UE，UE2例如为距基站远或位于小区边缘的UE。
基站在对UE1和UE2一起进行调度时，可根据特定的调制方式，将对于UE1和UE2的比特信息映射到符号中。图2示出的了16QAM调制方式中的符号的示意图。如图2所示，16QAM的每个符号包括4个比特，其中每个符号中包括2个高优先级比特(如图2中的白色方框所示)和2个低优先级比特(如图2中的灰色方框所示)。
此外在图2中，F表示在调制后的符号中用于UE2的比特，并且N表示在调制后的符号中用于UE1的比特。如图2所示，根据目前在比特到符号映射方法，位于小区中心的UE1的全部比特信息均被映射到低优先级比特上，并且位于小区边缘的UE2的全部比特信息均被映射到高优先级比特上。这导致UE1的从基站接收到的信号质量较差，造成无线通信系统的整体吞吐量减少。
本发明的实施例改进了上述比特到符号的映射方法。下面，将参照附图来描述本发明的实施例。
图3是示出了根据本发明的实施例的由基站执行的比特到符号的映射方法300的流程图。如图3所示，在步骤S301中，在对同时被基站调度的多个移动台进行调制时，将对于多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特。根据本发明的一个示例，一起被基站调度的多个移动台可具有不同的信号干扰比(以下简称为信干比)，并且第一移 动台可以是在所述多个移动台中具有较高信干比的移动台。例如，第一移动台可具有较好的信道状态，可以是位于小区中心的移动台。此外根据本发明的另一示例，可根据调制符号中比特的传输可靠性确定优先级。具体地，符号中的高优先级比特的信息传输可靠性高于符号中的低优先级比特的信息传输可靠性。
第一部分比特信息可以是在从对于第一移动台的全部比特信息中的选择的部分比特信息。例如，基站可以以多种调制方式对一起调度的多个移动台的比特信息进行调制，并且可根据基站对于多个移动台的调制方式来确定将被映射到符号中高优先级比特的第一部分比特信息的数量。可以通过对一起被调度的多个UE的编码调制和信道情况仿真来预先确定每种调制方式下的第一部分比特信息的数量。例如，可预先确定每种调制方式下的第一部分比特信息的数量，以使得在该调制方式下起被调度的多个UE的几何平均吞吐量最大或其它度量为最优。例如，当基站使用64QAM对多个移动台进行调制时，可从对于第一移动台的比特信息中选择比当基站使用16QAM对多个移动台进行调制时更多的比特信息作为第一部分比特信息。
此外，可通过不同的方式将第一部分比特信息映射到符号中的高优先级比特。例如，在步骤S301中可将所述第一部分比特信息以预定间隔映射到符号中的高优先级比特。又例如，在步骤S301中还可将第一部分比特信息映射到符号中连续分布的高优先级比特。与确定第一部分比特信息类似，可根据基站对于多个移动台的调制方式来确定映射方式。
图4是示出的了根据本发明的一个示例，在16QAM调制方式下进行比特到符号映射的示意图。与图2类似，在图4中白色方框表示符号中的高优先级比特，并且灰色方框表示符号中的低优先级比特。如图4所示，调制后的符号中的高优先级比特在时间方向上顺序排列。
可预先将第一部分比特信息的映射间隔设置为一高优先级比特。相应地，在根据步骤S301进行映射时，将第一部分比特信息映射到每间隔一高优先级比特的高优先级比特上。在图4中，N表示在调制后的符号中用于第一移动台的比特，并且F表示在调制后的符号中用于所述多个移动台中除了第一移动台以外的其他移动台的比特。如图4所示，在时间方向上顺序排列的高优先级比特中，第一移动台的第一部分比特信息被映射到每间隔一高优先级比特的高优先级比特上。
图5是示出的了根据本发明的另一示例，在16QAM调制方式下进行比特到符号映射的示意图。如图5所示，调制后的符号中的高优先级比特在时间方向上顺序排列。可预先确定在顺序排列的高优先级比特中，第一部分比特信息的将被映射到的起始位置和长度(即，比特数量)。根据步骤S301，将第一部分比特信息映射到从预先设定的起始位置开始的预定长度的、顺序排列的高优先级比特上。在图5中，N表示在调制后的符号中用于第一移动台的比特，并且F表示在调制后的符号中用于所述多个移动台中除了第一移动台以外的其他移动台的比特。如图5所示，在时间方向上顺序排列的高优先级比特中，第一移动台的第一部分比特信息被映射到从第一位高优先级比特开始，顺序排列的、预定长度的高优先级比特上。
在根据本发明的实施例中，可预先在基站调度和多个移动台中存储第一移动台的第一部分比特信息确定方式和映射方式。在步骤S301中，可根据预先存储的第一部分比特信息确定方式，在对同时被基站调度的多个移动台进行调制时，确定第一移动台的第一部分比特信息，并且根据预先存储的映射方式将所确定的第一部分比特信息映射到符号中的高优先级比特。例如，可预先将调制编码方式(MCS)与第一部分比特信息确定方式和映射方式对应存储，并且在步骤S301中可从所存储的多个与第一部分比特信息确定方式和映射方式中，选择与基站当前对多个移动台的调制方式对应的第一部分比特信息确定方式和映射方式。
此外，基站还可静态或半静态地调整第一移动台的第一部分比特信息确定和映射方式。例如，图3中的方法还可包括根据多个移动台的信道质量获得第一移动台的第一部分比特信息确定和映射方式，并且在对同时被基站调度的多个移动台进行调制之前，向多个移动台通知所获得的确定和映射方式。具体地，基站可根据多个移动台的信道质量获得第一移动台的第一部分比特信息确定和映射方式，以使得一起被基站调度的多个移动台的吞吐量最大。例如，当所述多个移动台的吞吐量的几何平均值最大时，可认为该多个移动台的吞吐量最大。更具体地，可根据从多个移动台接收的信道状态指示(CSI)来获得第一移动台的第一部分比特信息确定和映射方式。如上所述，从对于第一移动台的全部比特信息中的确定第一部分比特信息可包括确定第一部分比特信息的数量。例如，根据从多个移动台接收的CSI来从对于第一移动台的全部比特信息中的确定第一部分比特信息的数量。此外，如上所述，可 通过不同的方式将第一部分比特信息映射到符号中的高优先级比特，并且可根据多个移动台的信道质量来获得适用于该信道质量的映射方式。根据本发明的一个示例，在根据多个移动台的信道质量获得第一移动台的第一部分比特信息确定方式和映射方式后，基站可通过无线资源控制信令或物理下行控制信道，向多个移动台通知所获得的确定和映射方式，并且在步骤S301中，根据获得的确定和映射方式，在对同时被基站调度的多个移动台进行调制时，将对于多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特。
返回图3，在步骤S302中，将对于第一移动台的第二部分比特信息映射到符号中的低优先级比特。第二部分比特信息可以是在对于第一移动台的全部比特信息中除了第一部分比特信息以外的比特信息。如图4和图5所示，第一移动台的第二部分比特信息均被映射到符号中的低优先级比特上。
可选择地，图3中所示的方法还可包括在对同时被基站调度的多个移动台进行调制时，将对于多个移动台中的第二移动台的所有比特信息映射到符号中的高优先级比特。第二移动台可以是在所述多个移动台中具有较低信干比的移动台。例如，第二移动台可以是位于小区边缘的移动台。由于位于小区边缘的移动台的信道质量通常低于位于小区中心的移动台的信道质量，因此，可通过将对于第二移动台的所有比特信息映射到符号中的高优先级比特来确保第二移动台的通信质量。
根据本发明的一个示例，图3中所示的方法还可包括调整分配给多个移动台的发射功率以进一步增加多个移动台的吞吐率。具体地，基站可对分配给第一移动台的发射功率和分配给第二移动台的发射功率在基站的总发射功率中所占的比例进行调整。
此外可选择地，图3中所示的方法可用于采用多用户重叠传输类型2(MUST Category 2)来对多个移动台进行比特信息到符号映射的基站。
在根据本发明上述实施例的比特到符号的映射方法中，通过将对于同时被基站调度的多个移动台中第一移动台的一部分比特信息映射到调制后的符号中的高优先级比特，有效地改善了第一移动台从基站接收到的信号质量，从而确保整个通信系统的吞吐量。
图6是示出了在高斯白噪声信道中，在基站使用64QAM方式对一起调度的第一移动台和第二移动台进行调整的情况下，对第一移动台和第二移动 台接收到的信号的仿真结果。假设在图6所示的示例中，以编码率0.65对第一移动台和第二移动台进行编码，并且对20个资源块进行仿真。如图6所示，与传统的映射方法相比，根据本申请实施例的映射方法300对于第一移动台接收到的信号质量有明显提升，同时对于第二移动台接收到的信号质量的影响较小。例如，如图6所示，当信号块差错率(BLER)为0.1时，与现有的映射方法相比，第一移动台的信干比(SNR)改善了0.45dB,而第而移动台的信干比(SNR)仅劣化了0.1dB。应注意，以上描述的本发明实施例的映射方法中的各个步骤不必按照所示的顺序执行。可以颠倒或并行地执行某些步骤。例如，可以同时执行将对于第一移动台的第一部分比特信息映射到符号中的高优先级比特(步骤S301)，将对于第一移动台的第二部分比特信息映射到符号中的低优先级比特(步骤S302)，以及将对于多个移动台中的第二移动台的所有比特信息映射到符号中的高优先级比特。
下面，参照图7来描述根据本发明实施例的基站。图7示出了根据本发明实施例的基站700的框图。如图7所示，基站700包括第一映射单元710和第二映射单元720。除了这两个单元以外，基站700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700执行的下述操作的具体细节与在上文中参照图1-6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。
第一映射单元710可在对同时被基站调度的多个移动台进行调制时，将对于多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特。根据本发明的一个示例，一起被基站调度的多个移动台可具有不同的信干比，并且第一移动台可以是在所述多个移动台中具有较高信干比的移动台。例如，第一移动台可具有较好的信道状态，可以是位于小区中心的移动台。此外根据本发明的另一示例，可根据调制符号中比特的传输可靠性确定优先级。具体地，符号中的高优先级比特的信息传输可靠性高于符号中的低优先级比特的信息传输可靠性。
第一部分比特信息可以是在从对于第一移动台的全部比特信息中的选择的部分比特信息。例如，基站可以以多种调制方式对一起调度的多个移动台的比特信息进行调制，并且第一映射单元710可根据基站对于多个移动台 的调制方式来确定将被映射到符号中高优先级比特的第一部分比特信息的数量。例如，当基站使用64QAM对多个移动台进行调制时，第一映射单元710可从对于第一移动台的比特信息中选择比当基站使用16QAM对多个移动台进行调制时更多的比特信息作为第一部分比特信息。
此外，可通过不同的方式将第一部分比特信息映射到符号中的高优先级比特。例如，第一映射单元710可将所述第一部分比特信息以预定间隔映射到符号中的高优先级比特。又例如，第一映射单元710还可将第一部分比特信息映射到符号中连续分布的高优先级比特。与确定第一部分比特信息类似，第一映射单元710可根据基站对于多个移动台的调制方式来确定映射方式。
图4是示出的了根据本发明的一个示例，在16QAM调制方式下进行比特到符号映射的示意图。与图2类似，在图4中白色方框表示符号中的高优先级比特，并且灰色方框表示符号中的低优先级比特。如图4所示，调制后的符号中的高优先级比特在时间方向上顺序排列。
可预先将第一部分比特信息的映射间隔设置为一高优先级比特。相应地，第一映射单元710在进行映射时，将第一部分比特信息映射到每间隔一高优先级比特的高优先级比特上。例如在以上图4所示的示例中，在时间方向上顺序排列的高优先级比特中，第一移动台的第一部分比特信息被第一映射单元710映射到每间隔一高优先级比特的高优先级比特上。
可替换地，可预先确定在顺序排列的高优先级比特中，第一部分比特信息的将被映射到的起始位置和长度(即，比特数量)。相应地，第一映射单元710将第一部分比特信息映射到从预先设定的起始位置开始的预定长度的、顺序排列的高优先级比特上。例如在图5所示的示例中，在时间方向上顺序排列的高优先级比特中，第一移动台的第一部分比特信息被第一映射单元710映射到从第一位高优先级比特开始，顺序排列的、预定长度的高优先级比特上。
此外，根据本发明的一个示例，基站700还可包括存储单元，以预先在基站调度和多个移动台中存储第一移动台的第一部分比特信息确定方式和映射方式。第一映射单元710可根据预先存储的第一部分比特信息确定方式，在对同时被基站调度的多个移动台进行调制时，确定第一移动台的第一部分比特信息，并且根据预先存储的映射方式将所确定的第一部分比特信息映射到符号中的高优先级比特。例如，可预先将调制编码方式(MCS)与第一部 分比特信息确定方式和映射方式对应存储在基站的存储单元中。第一映射单元710可从所存储的多个与第一部分比特信息确定方式和映射方式中，选择与基站当前对多个移动台的调制方式对应的第一部分比特信息确定方式和映射方式。
此外，根据本发明的另一示例，基站700还可静态或半静态地调整第一移动台的第一部分比特信息确定和映射方式。例如，基站700还可包括方式确定单元，以根据多个移动台的信道质量获得第一移动台的第一部分比特信息确定和映射方式；以及发送单元，以在对同时被基站调度的多个移动台进行调制之前，向多个移动台通知所获得的确定和映射方式。具体地，方式确定单元可根据多个移动台的信道质量获得第一移动台的第一部分比特信息确定和映射方式，以使得一起被基站调度的多个移动台的吞吐量最大。例如，当所述多个移动台的吞吐量的几何平均值最大时，可认为该多个移动台的吞吐量最大。更具体地，方式确定单元可根据从多个移动台接收的信道状态指示(CSI)来获得第一移动台的第一部分比特信息确定和映射方式。
根据本发明的一个示例，在根据多个移动台的信道质量获得第一移动台的第一部分比特信息确定方式和映射方式后，发送单元可通过无线资源控制信令或物理下行控制信道，向多个移动台通知所获得的确定和映射方式，并且第一映射单元710可根据获得的确定和映射方式，在对同时被基站调度的多个移动台进行调制时，将对于多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特。
第二映射单元720可将对于第一移动台的第二部分比特信息映射到符号中的低优先级比特。第二部分比特信息可以是在对于第一移动台的全部比特信息中除了第一部分比特信息以外的比特信息。如图4和图5所示，第一移动台的第二部分比特信息均被映射到符号中的低优先级比特上。
可选择地，基站700还可包括第三映射单元，以在对同时被基站调度的多个移动台进行调制时，将对于多个移动台中的第二移动台的所有比特信息映射到符号中的高优先级比特。第二移动台可以是在所述多个移动台中具有较低信干比的移动台。例如，第二移动台可以是位于小区边缘的移动台。由于位于小区边缘的移动台的信道质量通常低于位于小区中心的移动台的信道质量，因此，可通过将对于第二移动台的所有比特信息映射到符号中的高优先级比特来确保第二移动台的通信质量。
根据本发明的一个示例，基站700还可包括功率调整单元，以调整分配给多个移动台的发射功率以进一步增加多个移动台的吞吐率。具体地，功率调整单元可对分配给第一移动台的发射功率和分配给第二移动台的发射功率在基站的总发射功率中所占的比例进行调整。
此外可选择地，基站700可用于采用多用户重叠传输类型2(MUST Category 2)来对多个移动台进行比特信息到符号映射的基站。
在根据本发明上述实施例的基站中，通过将对于同时被基站调度的多个移动台中第一移动台的一部分比特信息映射到调制后的符号中的高优先级比特，有效地改善了第一移动台从基站接收到的信号质量，从而确保整个通信系统的吞吐量。
所属技术领域的技术人员知道，本发明可以实现为系统、装置、方法或计算机程序产品。因此，本发明可以具体实现为以下形式，即：可以是完全的硬件、也可以是完全的软件(包括固件、驻留软件、微代码等)，还可以是硬件和软件结合的形式，本文一般称为“组件、“模块”、“装置”或“系统”。此外，在一些实施例中，本发明还可以实现为在一个或多个计算机可读介质中的计算机程序产品的形式，该计算机可读介质中包含计算机可读的程序代码。
可以采用一个或多个计算机可读介质的任意组合。计算机可读介质可以是计算机可读信号介质或者计算机可读存储介质。计算机可读存储介质例如可以是但不限于电、磁、光、电磁、红外线、或半导体的系统、装置或器件，或者任意以上的组合。计算机可读存储介质的更具体的例子(非穷举的列表)包括：具有一个或多个导线的电连接、便携式计算机磁盘、硬盘、随机存取存储器(RAM)、只读存储器(ROM)、可擦式可编程只读存储器(EPROM或闪存)、光纤、便携式紧凑磁盘只读存储器(CD-ROM)、光存储器件、磁存储器件、或者上述的任意合适的组合。在本文件中，计算机可读存储介质可以是任何包含或存储程序的有形介质，该程序可以被指令执行系统、装置或者器件使用或者与其结合使用。
计算机可读的信号介质可以包括在基带中或者作为载波一部分传播的数据信号，其中承载了计算机可读的程序代码。这种传播的数据信号可以采用多种形式，包括但不限于电磁信号、光信号或上述的任意合适的组合。计 算机可读的信号介质还可以是计算机可读存储介质以外的任何计算机可读介质，该计算机可读介质可以发送、传播或者传输用于由指令执行系统、装置或者器件使用或者与其结合使用的程序。
附图中的流程图和框图显示了根据本发明的多个实施例的系统、方法和计算机程序产品的可能实现的体系架构、功能和操作。在这点上，流程图或框图中的每个方框可以代表一个模块、程序段或代码的一部分，所述模块、程序段或代码的一部分包含一个或多个用于实现规定的逻辑功能的可执行指令。也要注意的是，框图和/或流程图中的每个方框、以及框图和/或流程图中的方框的组合，可以用执行规定的功能或操作的专用的基于硬件的系统来实现，或者可以用专用硬件与计算机指令的组合来实现。
图8是示出按照本发明实施例的比特到符号映射系统800的总体硬件框图。比特到符号映射系统800可以实现为基站，并且如图8所示，比特到符号映射系统800可以包括：接收发送部件810、存储部件820和处理部件830。
接收发送部件810可从移动台接收/向移动台发送信号。存储部件820可以包括各种形式的计算机可读存储介质，例如易失性存储器和/或非易失性存储器。所述易失性存储器例如可以包括随机存取存储器(RAM)和/或高速缓冲存储器(cache)等。所述非易失性存储器例如可以包括只读存储器(ROM)、硬盘、闪存等。在所述计算机可读存储介质上可以存储一个或多个计算机程序指令。例如，存储部件820可存储实现以上结合图1-6描述的比特到符号的映射方法的计算机程序指令。处理器830可以运行所述程序指令，以实现上文所述的本公开的实施例的功能以及/或者其它期望的功能。
以上已经描述了本发明的各实施例，上述说明是示例性的，并非穷尽性的，并且也不限于所披露的各实施例。在不偏离所说明的各实施例的范围和精神的情况下，对于本技术领域的普通技术人员来说许多修改和变更都是显而易见的。本文中所用术语的选择，旨在最好地解释各实施例的原理、实际应用或对市场中的技术的改进，或者使本技术领域的其它普通技术人员能理解本文披露的各实施例。

Claims (19)

  1. 一种由基站执行的比特到符号的映射方法，包括：
    在对同时被所述基站调度的多个移动台进行调制时，将对于所述多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特；以及
    将对于所述第一移动台的第二部分比特信息映射到符号中的低优先级比特。
  2. 如权利要求1所述的方法，还包括：
    在对同时被所述基站调度的多个移动台进行调制时，将对于所述多个移动台中的第二移动台的所有比特信息映射到符号中的高优先级比特。
  3. 如权利要求2所述的方法，其中
    所述第一移动台的信干比大于所述第二移动台的信干比。
  4. 如权利要求2或3中所述的方法，还包括：
    根据对第一移动台和第二移动台的调制方式确定对于所述第一移动台的第一部分比特信息的数量。
  5. 如权利要求1-3中任意一项所述的方法，其中所述将对于所述多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特包括：
    将所述第一部分比特信息以预定间隔映射到符号中的高优先级比特。
  6. 如权利要求1-3中任意一项所述的方法，其中所述将对于所述多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特包括：
    根据预定长度，将所述第一部分比特信息映射到符号中连续的高优先级比特。
  7. 如权利要求1-3中任意一项所述的方法，还包括：
    根据所述多个移动台的信道质量获得所述第一移动台的第一部分比特信息确定和映射方式；
    静态或半静态地向所述多个移动台通知所获得的确定和映射方式，其中
    通过无线资源控制信令或物理下行控制信道，向所述多个移动台通知所获得的确定和映射方式，以及
    所述在对同时被所述基站调度的多个移动台进行调制时，将对于所述多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特包括：
    根据获得的确定和映射方式，在对同时被所述基站调度的多个移动台进行调制时，将对于所述多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特。
  8. 如权利要求1-3中任意一项所述的方法，还包括：
    预先在所述基站调度和所述多个移动台中存储第一移动台的第一部分比特信息确定和映射方式，其中
    所述在对同时被所述基站调度的多个移动台进行调制时，将对于所述多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特包括：
    根据预先存储的第一部分比特信息确定和映射方式，在对同时被所述基站调度的多个移动台进行调制时，将对于所述多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特。
  9. 如权利要求1-3中任意一项所述的方法，其中
    符号中的高优先级比特的信息传输可靠性高于符号中的低优先级比特的信息传输可靠性。
  10. 如权利要求1-3中任意一项所述的方法，还包括：
    调整分配给所述多个移动台的发射功率以增加所述多个移动台的吞吐率。
  11. 一种基站，包括：
    第一映射单元，被配置为在对同时被所述基站调度的多个移动台进行调制时，将对于所述多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特；以及
    第二映射单元，被配置为将对于所述第一移动台的第二部分比特信息映射到符号中的低优先级比特。
  12. 如权利要求11所述的基站，还包括：
    第三映射单元，被配置为在对同时被所述基站调度的多个移动台进行调制时，将对于所述多个移动台中的第二移动台的所有比特信息映射到符号中的高优先级比特。
  13. 如权利要求12所述的基站，其中
    第一移动台的信干比大于所述第二移动台的信干比。
  14. 如权利要求12或13中所述的基站，还包括：
    比特信息确定单元，被配置为根据对所述第一移动台和所述第二移动台的调制方式确定对于所述第一移动台的第一部分比特信息的数量。
  15. 如权利要求11-13中任意一项所述的基站，其中
    所述第一映射单元将所述第一部分比特信息以预定间隔映射到符号中的高优先级比特。
  16. 如权利要求11-13中任意一项所述的基站，其中
    所述第一映射单元根据预定长度，将所述第一部分比特信息映射到符号中连续的高优先级比特。
  17. 如权利要求11-13中任意一项所述的基站，还包括：
    方式确定单元，被配置为根据所述多个移动台的信道质量获得所述第一移动台的第一部分比特信息确定和映射方式；
    发送单元，被配置为静态或半静态地向所述多个移动台通知第一移动台的第一部分比特信息确定和映射方式，其中
    所述发送单元通过无线资源控制信令或物理下行控制信道，向所述多个移动台通知所获得的确定和映射方式，以及
    所述第一映射单元根据获得的确定和映射方式，在对同时被所述基站调度的多个移动台进行调制时，将对于所述多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特。
  18. 如权利要求11-13中任意一项所述的基站，还包括：
    存储单元，被配置为预先存储第一移动台的第一部分比特信息确定和映射方式，其中
    所述第一映射单元根据预先存储的第一移动台的第一部分比特信息确定和映射方式，将对于所述多个移动台中的第一移动台的第一部分比特信息映射到符号中的高优先级比特。
  19. 如权利要求11-13中任意一项所述的基站，还包括：
    功率调整单元，被配置为调整分配给所述多个移动台的发射功率以增加所述多个移动台的吞吐率。
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