JP2019508935A - Bit-to-symbol mapping method and base station - Google Patents

Abstract

The embodiments of the present invention provide a method of bit-to-symbol mapping performed by a base station and a base station. A bit-to-symbol mapping method performed by a base station according to an embodiment of the present invention is a first mobile station among a plurality of mobile stations when modulating a plurality of mobile stations simultaneously scheduled by the base station. Mapping the first partial bit information to the high priority bits in the symbol, and mapping the second partial bit information for the first mobile station to the low priority bits in the symbol.

Description

  The present invention relates to a bit-to-symbol mapping method performed by a base station and a base station. More specifically, 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 (NOMA) is a radio access technology proposed in Long Term Evolution (LTE) release 13 under discussion in the 3rd Generation Partnership Project (3GPP). In the NOMA system, on the transmitting side, the base station multiplexes data for the 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. Improves system throughput.

  In the NOMA system, a base station maps bit information of each of a plurality of mobile stations simultaneously scheduled to a symbol according to a specific modulation scheme. Currently, in the above-mentioned bit-to-symbol mapping procedure, in order to ensure the communication quality of the mobile station whose channel condition is relatively bad, the base station is compared to the bit information of the mobile station whose channel condition is relatively bad In addition to allocating high priority bits of symbols in a specific modulation scheme, low priority bits of symbols are allocated in a specific modulation scheme to bit information of a mobile station whose channel condition is relatively good. However, according to such a mapping method, there is a possibility that the quality of a signal received from a base station by a mobile station with a relatively good channel condition may be degraded, and the throughput of the entire communication system is reduced.

  According to the present invention, bit-to-symbol mapping for securing the throughput of the entire communication system by efficiently improving the quality of a signal received from a base station by a mobile station with relatively good channel condition. It would be desirable to provide a method and corresponding base station.

  According to one aspect of the present disclosure, when modulating a plurality of mobile stations simultaneously scheduled by the base station, the first partial bit information for the first mobile station of the plurality of mobile stations is given high priority in the symbol A method of bit to symbol mapping performed by a base station is provided, including mapping to bits and mapping second partial bit information for the first mobile station to low priority bits in the symbol.

  According to another aspect of the present disclosure, when modulating a plurality of mobile stations simultaneously scheduled by a base station, the first partial bit information for the first mobile station of the plurality of mobile stations is symbolized in symbols. First mapping means arranged to map to high priority bits; and second mapping means arranged to map second partial bit information for the first mobile station to low priority bits in the symbol. Providing a base station.

  The above and other objects, features and advantages of the present disclosure will become more apparent by describing the embodiments of the present disclosure in detail with reference to the drawings.

FIG. 1 shows a schematic view of a NOMA communication system according to an embodiment of the present invention. FIG. 1 shows a schematic diagram of performing bit-to-symbol mapping in a 16 QAM modulation scheme according to a conventional mapping method. 3 shows a flowchart of a bit to symbol mapping method performed by a base station according to an embodiment of the present invention. FIG. 1 shows a schematic diagram of performing bit-to-symbol mapping in a 16 QAM modulation scheme according to an example of the present invention. FIG. 6 shows a schematic diagram of performing bit-to-symbol mapping with 16 QAM modulation according to another example of the present invention. The first mobile station and the second mobile station in the case of adjusting the first mobile station and the second mobile station simultaneously scheduled by the base station using the 64 QAM scheme in the White Gaussian Noise channel. The simulation results for the received signal are shown. Fig. 3 shows a block diagram of a base station according to an embodiment of the present invention. FIG. 1 shows a hardware block diagram of the overall system for mapping bits to symbols according to an embodiment of the present invention.

  Hereinafter, a bit-to-symbol mapping method and a base station performed by a base station according to an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same reference symbols always denote the same elements. It should be understood that the embodiments described herein are exemplary only and should not be construed as limiting the scope of the present disclosure.

  First, an example to which the NOMA wireless communication system according to the embodiment of the present invention can be applied will be described with reference to FIG. The wireless communication system illustrated in FIG. 1 includes a base station and a plurality of user equipments (UEs) that communicate with the base station. The base station can connect to upper layer devices (not shown), which can further connect to the core network (not shown). It should be noted that although only one base station and two UEs are shown in FIG. 1, this is an example, and more or less base stations and UEs may be present as needed. . Also, the UE referred to herein may include various types of user terminals, such as mobile terminals (or called mobile stations) or fixed terminals. However, for convenience of description, the UE and the mobile station can be used interchangeably hereinafter.

  The base station determines, for each downlink resource block (e.g., frequency resource block), whether to multiplex data for one of the UEs to the resource block by scheduling each UE. For example, the base station may perform the above scheduling according to channel state information (CSI) indicating the radio channel condition between the UE and the base station, which is fed back from each UE. In the example shown in FIG. 1, the base station can multiplex data for UE1 and UE2 in the same resource block. Also, the base station transmits data for UE1 at a first power level (or first power) and data for UE2 at a second power level (or second power) different from the first power level. Can be sent. Here, UE1 is a UE located, for example, near the base station or located in the center of the cell, and UE2 is, for example, a UE located far from the base station or located at the edge of the cell.

  The base station may map bit information for UE1 and UE2 to symbols according to a specific modulation scheme when scheduling UE1 and UE2 simultaneously. FIG. 2 shows a schematic view of symbols according to the 16 QAM modulation scheme. As shown in FIG. 2, each symbol of 16 QAM contains four bits, and in each symbol, two high priority bits (as indicated by the white block in FIG. 2) and two low priority bits (in gray in FIG. 2) Block) indicates that the

  Also, in FIG. 2, F indicates a bit for UE 2 in the modulated symbol, and N indicates a bit for UE 1 in the modulated symbol. As shown in FIG. 2, according to the conventional bit-to-symbol mapping method, all bit information of UE1 located at the center of the cell is mapped to low priority bits and located at the edge of the cell. All bit information of UE2 to be mapped is mapped to high priority bits. Thereby, the quality of the signal received from the base station of UE1 will deteriorate, and the through-put of the whole radio | wireless communications system will be reduced.

  The embodiment of the present invention improves the above bit-to-symbol mapping method. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 3 shows a flow chart of a bit-to-symbol mapping method 300 performed by a base station according to an embodiment of the present invention. As shown in FIG. 3, in step S301, when modulating a plurality of mobile stations simultaneously scheduled by the base station, the first partial bit information for the first mobile station of the plurality of mobile stations is high in the symbol. Map to priority bits. According to one embodiment of the present invention, a plurality of mobile stations simultaneously scheduled by the base station may have different signal-noise ratios (hereinafter simply referred to as SNR), or One mobile station may be a mobile station having a relatively high SNR at the plurality of mobile stations. For example, the first mobile station may be a mobile station that has relatively good channel conditions and is located at the center of the cell. Also, according to another example of the present invention, the priority can be determined according to the transmission reliability of the bits in the modulation symbol. Specifically, the reliability of the information transmission of high priority bits in the symbol is higher than the reliability of the information transmission of low priority bits in the symbol.

  The first partial bit information may be partial bit information selected from all bit information for the first mobile station. For example, the base station can modulate bit information of a plurality of mobile stations scheduled at the same time with a plurality of modulation schemes, and high priority bits in symbols depending on the modulation scheme for the plurality of mobile stations of the base station The number of first partial bit information to be mapped to can be determined. By simulation of coded modulation and channel conditions of a plurality of UEs scheduled at the same time, the number of first partial bit information in each modulation scheme can be determined in advance. For example, by predetermining the quantity of first partial bit information in various modulation schemes, geometric average throughput of multiple UEs simultaneously scheduled in the modulation scheme is maximized, or other metrics are optimized. . For example, when the base station modulates multiple mobile stations using 64 QAM, more bit information from the bit information for the first mobile station than when the base station modulates multiple mobile stations using 16 QAM is used It can be selected as the first partial bit information.

  Also, the first partial bit information can be mapped to high priority bits in the symbol in different ways. For example, in step S301, the first partial bit information can be mapped to high priority bits in a symbol at predetermined intervals. Also, for example, in step S301, the first partial bit information can be mapped to high priority bits continuously distributed in the symbol. Similarly to determining the first partial bit information, the mapping scheme can be determined according to the modulation scheme for a plurality of mobile stations of the base station.

  FIG. 4 shows a schematic diagram of performing bit-to-symbol mapping in a 16 QAM modulation scheme, according to one example of the present invention. Similar to FIG. 2, in FIG. 4, white blocks indicate high priority bits in the symbol, and gray blocks indicate low priority bits in the symbol. As shown in FIG. 4, the high priority bits in the modulated symbol are arranged in order in the time direction.

  The mapping interval of the first partial bit information can be set in advance to one high priority bit. Accordingly, when mapping is performed in step S301, the first partial bit information is mapped to high priority bits every other high priority bit. In FIG. 4, N indicates a bit for the first mobile station in the symbol after modulation, and F indicates for the other mobile stations other than the first mobile station among the plurality of mobile stations in the symbol after modulation. Indicates a bit of As shown in FIG. 4, in the high priority bits arranged in order in the time direction, the first partial bit information of the first mobile station is mapped to high priority bits every other high priority bit.

  FIG. 5 shows a schematic diagram of performing bit-to-symbol mapping in a 16 QAM modulation scheme according to another example of the present invention. As shown in FIG. 5, the high priority bits in the symbol after modulation are arranged in order in the time direction. The starting position and the length (ie, the number of bits) to which the first partial bit information is mapped can be predetermined in the high priority bits arranged in order. In step S301, the first partial bit information is mapped to high priority bits arranged in order from a preset start position over a predetermined length. In FIG. 5, N indicates a bit for the first mobile station in the symbol after modulation, and F indicates for the other mobile stations other than the first mobile station among the plurality of mobile stations in the symbol after modulation. Indicates a bit of As shown in FIG. 5, in the high priority bits arranged in order in the time direction, the first partial bit information of the first mobile station has a predetermined length arranged in order from the high priority bit of the first bit. Are mapped to high priority bits of

  In the embodiment according to the present invention, the determination / mapping scheme of the first partial bit information of the first mobile station can be stored in advance in the base station and the plurality of mobile stations. In step S301, when modulating a plurality of mobile stations simultaneously scheduled by the base station according to the determination method of the first partial bit information stored in advance, the first partial bit information of the first mobile station is determined. The determined first partial bit information can be mapped to the high priority bits in the symbol according to a first partial bit information mapping scheme stored in advance. For example, the modulation coding scheme (MCS) is stored in advance in association with the determination / mapping scheme of the first partial bit information, and in step S301, from the determination / mapping scheme of the plurality of stored first partial bits information The base station can select the first partial bit information determination / mapping scheme corresponding to the modulation scheme for a plurality of mobile stations.

  Also, the base station can adjust the determination / mapping scheme of the first partial bit information of the first mobile station statically or quasi-statically. For example, according to the channel quality of a plurality of mobile stations, the method of FIG. 3 obtains the determination / mapping scheme of the first partial bit information of the first mobile station, and simultaneously performs a plurality of movements scheduled by the base station. The method may further include notifying the plurality of mobile stations of the acquired determination and mapping scheme before modulating the station. Specifically, the base station is adapted to the first part of the first mobile station according to the channel quality of the plurality of mobile stations, such that the throughputs of the plurality of mobile stations simultaneously scheduled to the base station are maximized. It is possible to obtain the determination / mapping scheme of bit information. For example, when the geometric mean value of the throughputs of the plurality of mobile stations is maximized, it can be considered that the throughput of the plurality of mobile stations is maximized. More specifically, the determination / mapping scheme of the first partial bit information of the first mobile station can be acquired according to channel state indicators (CSI) received from a plurality of mobile stations. As described above, determining the first partial bit information from all bit information for the first mobile station can include determining a quantity of the first partial bit information. For example, according to CSI received from a plurality of mobile stations, the number of first partial bit information is determined from all bit information for the first mobile station. In addition, as described above, the first partial bit information can be mapped to the high priority bits in the symbol by different methods, and an enemy mapping method suitable for the channel quality according to the channel quality of a plurality of mobile stations. You can get According to an embodiment of the present invention, after obtaining the determination / mapping scheme of the first partial bit information of the first mobile station according to the channel quality of the plurality of mobile stations, the base station performs radio resource control signaling or A plurality of mobile stations are notified of the obtained determination and mapping scheme by the physical downlink control channel, and in step S301, a plurality of mobile stations simultaneously scheduled by the base station according to the obtained determination and mapping scheme The first partial bit information for the first mobile station of the plurality of mobile stations can be mapped to high priority bits in the symbol when modulating.

  Returning to FIG. 3, in step S302, the second partial bit information for the first mobile station is mapped to low priority bits in the symbol. The second partial bit information may be bit information other than the first partial bit information in all bit information for the first mobile station. As shown in FIG. 4 and FIG. 5, any second partial bit information of the first mobile station is mapped to low priority bits in the symbol.

  The method shown in FIG. 3 maps all bit information for the second mobile station of the plurality of mobile stations to high priority bits in the symbol when modulating the plurality of mobile stations simultaneously scheduled by the base station. You may include things further. The second mobile station may be a mobile station having a relatively low SNR in the plurality of mobile stations. For example, the second mobile station may be a mobile station located at the edge of the cell. The channel quality of the mobile station located at the edge of the cell is usually lower than the channel quality of the mobile station located at the center of the cell, so mapping all bit information for the second mobile station to high priority bits in the symbol By doing this, the communication quality of the second mobile station can be secured.

  According to an illustration of the invention, the method shown in FIG. 3 may include adjusting the transmit power allocated to the plurality of mobile stations to further increase the throughput of the plurality of mobile stations. Specifically, 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.

  In addition, the method illustrated in FIG. 3 can be used for a base station that performs mapping of bit information to symbols for a plurality of mobile stations by adopting multiuser superposition transmission category 2 (MUST Category 2).

  The bit-to-symbol mapping method according to the above-described embodiment of the present invention is in the symbol after modulating some bit information for the first mobile station among the plurality of mobile stations simultaneously scheduled by the base station. Mapping to high priority bits efficiently improves the quality of the signal received by the first mobile station from the base station, thus ensuring the throughput of the entire communication system.

  FIG. 6 shows that in the white Gaussian noise channel, when the base station coordinates the first mobile station and the second mobile station simultaneously scheduled using the 64 QAM scheme, the first mobile station and the second mobile station received The simulation results for the signal are shown. In the example shown in FIG. 6, it is assumed that coding is performed on the first mobile station and the second mobile station at a coding rate of 0.65, and simulation is performed on 20 resource blocks. As shown in FIG. 6, compared to the conventional mapping method, according to the mapping method 300 according to the embodiment of the present invention, the quality of the signal received by the first mobile station is significantly improved, and at the same time, the second mobile station The influence on the quality of the received signal is small. For example, as shown in FIG. 6, when the signal block error rate (BLER) is 0.1, the SNR of the first mobile station is improved by 0.45 dB as compared to the conventional mapping method, and the second The mobile station's SNR was degraded by 0.1 dB. It should be noted that the steps in the mapping method of the embodiment of the present invention described above do not necessarily have to be performed in the order shown. Some steps may be interchanged or performed in parallel. For example, mapping the first partial bit information for the first mobile station to high priority bits in the symbol (step S301), and mapping the second partial bit information for the first mobile station to low priority bits in the symbol (Step S302) and mapping all bit information for the second mobile station of the plurality of mobile stations to high priority bits in the symbol may be performed simultaneously.

  Hereinafter, a base station according to an embodiment of the present invention will be described with reference to FIG. FIG. 7 shows a block diagram of a base station 700 according to an embodiment of the present invention. As shown in FIG. 7, the base station 700 comprises a first mapping means 710 and a second mapping means 720. Although the base station 700 may have other parts other than these two means, these parts are not related to the embodiment of the present invention, and so the illustration and description thereof will be omitted here. Also, since the following operation details performed by the base station 700 according to an embodiment of the present invention are the same as the details described above with reference to FIGS. I omit explanation.

  When the first mapping means 710 simultaneously modulates a plurality of mobile stations scheduled by the base station, the first partial bit information for the first mobile station of the plurality of mobile stations is converted to high priority bits in the symbol. It can be mapped. According to an illustration of the invention, a plurality of mobile stations simultaneously scheduled by the base station may have different SNRs, and the first mobile station may have a relatively high SNR in said plurality of mobile stations. It may be a mobile station having For example, the first mobile station may have a relatively good channel condition, or may be a mobile station located at the center of the cell. Also, according to another example of the present invention, the priority can be determined according to the transmission reliability of the bits in the modulation symbol. Specifically, the reliability of the information transmission of high priority bits in the symbol is higher than the reliability of the information transmission of low priority bits in the symbol.

  The first partial bit information may be partial bit information selected from all bit information for the first mobile station. For example, the base station modulates bit information of a plurality of mobile stations scheduled at the same time with a plurality of modulation schemes, and the first mapping means 710 determines in symbols according to the modulation schemes for a plurality of mobile stations of the base station. The quantity of first partial bit information to be mapped to high priority bits can be determined. For example, when the base station modulates a plurality of mobile stations using 64 QAM, the first mapping means 710 modulates the plurality of mobile stations using 16 QAM from bit information for the first mobile station More bit information than at times may be selected as the first partial bit information.

  Also, the first partial bit information can be mapped to high priority bits in the symbol in different ways. For example, the first mapping means 710 may map the first partial bit information to high priority bits in a symbol at predetermined intervals. Also, for example, the first mapping means 710 may map the first partial bit information to the high priority bits continuously distributed in the symbol. Similar to the determination of the first partial bit information, the first mapping means 710 can determine the mapping scheme according to the modulation scheme for a plurality of mobile stations of the base station.

  FIG. 4 shows a schematic diagram of performing bit-to-symbol mapping in a 16 QAM modulation scheme, according to one example of the present invention. Similar to FIG. 2, white blocks in FIG. 4 indicate high priority bits in the symbol, and gray blocks indicate low priority bits in the symbol. As shown in FIG. 4, the high priority bits in the modulated symbol are arranged in order in the time direction.

  The mapping interval of the first partial bit information may be set in advance to one high priority bit. Accordingly, the first mapping means 710 maps the first partial bit information to the high priority bits every one high priority bit when mapping. For example, in the example shown in FIG. 4 above, in the high priority bits arranged in order in the time direction, the first partial bit information of the first mobile station is changed by the first mapping means 710 every other high priority bit. Are mapped to high priority bits.

  The starting position and the length (ie, the number of bits) to which the first partial bit information is mapped can be predetermined in the high priority bits arranged in order. In response to this, the first mapping means 710 maps the first partial bit information to the high priority bits arranged in order from the preset start position over a predetermined length. For example, in the example shown in FIG. 5, in the high priority bits arranged in order in the time direction, the first partial bit information of the first mobile station is transmitted from the high priority bit of the first bit by the first mapping means 710 It is mapped to high priority bits of a predetermined length arranged in order.

  Further, according to one example of the present invention, the base station 700 further stores storage means for storing the determination / mapping scheme of the first partial bit information of the first mobile station in advance in the base station and the plurality of mobile stations. You may have. When the first mapping means 710 simultaneously modulates a plurality of mobile stations scheduled by the base station according to the determination method of the first partial bit information stored in advance, the first partial bits of the first mobile station Information can be determined, and depending on the pre-stored mapping scheme, the determined first partial bit information can be mapped to high priority bits in the symbol. For example, the modulation and coding scheme (MCS) can be previously stored in the storage means of the base station in association with the first partial bit information determination and mapping scheme. The first mapping means 710 determines the first partial bit information determination / mapping method corresponding to the modulation method for the plurality of mobile stations of the base station from the stored plurality of first partial bit information determination / mapping methods. It can be selected.

  Also, according to another example of the present invention, the base station 700 may adjust the determination / mapping scheme of the first partial bit information of the first mobile station statically or quasi-statically. For example, the base station 700 is scheduled by the base station simultaneously with scheme determining means for acquiring the determination / mapping scheme of the first partial bit information of the first mobile station according to the channel quality of a plurality of mobile stations. It may further comprise transmitting means for notifying the plurality of mobile stations of the acquired determination and mapping scheme before modulating the plurality of mobile stations. Specifically, the scheme determining means determines the first mobile station according to the channel quality of the plurality of mobile stations such that the throughputs of the plurality of mobile stations scheduled by the base station are maximized at the same time. The determination / mapping scheme of partial bit information can be acquired. For example, when the geometric mean value of the throughputs of the plurality of mobile stations is maximized, it can be considered that the throughput of the plurality of mobile stations is maximized. More specifically, the scheme determining means can acquire the determination / mapping scheme of the first partial bit information of the first mobile station according to channel state indicators (CSI) received from a plurality of mobile stations.

  According to one embodiment of the present invention, the transmission means transmits radio resource control signaling or after obtaining the determination / mapping scheme of the first partial bit information of the first mobile station according to the channel quality of the plurality of mobile stations. The physical downlink control channel can notify the acquired determination and mapping scheme to the plurality of mobile stations, and the first mapping means 710 is simultaneously scheduled by the base station according to the acquired determination and mapping scheme. When modulating a plurality of mobile stations, the first partial bit information for the first one of the plurality of mobile stations can be mapped to the high priority bits in the symbol.

  The second mapping means 720 may map the second partial bit information for the first mobile station to low priority bits in the symbol. The second partial bit information may be bit information other than the first partial bit information in all bit information for the first mobile station. As shown in FIGS. 4 and 5, the second partial bit information of the first mobile station is mapped to low priority bits in the symbol.

  When base station 700 modulates a plurality of mobile stations simultaneously scheduled by the base station, the base station 700 maps all bit information for the second mobile station among the plurality of mobile stations to high priority bits in the symbol. It may further comprise mapping means. The second mobile station may be a mobile station having a relatively low SNR in the plurality of mobile stations. For example, the second mobile station may be a mobile station located at the edge of the cell. The channel quality of the mobile station located at the edge of the cell is usually lower than the channel quality of the mobile station located at the center of the cell, so mapping all bit information for the second mobile station to high priority bits in the symbol By doing this, the communication quality of the second mobile station can be secured.

  According to an example of the present invention, the base station 700 may further comprise power adjustment means for adjusting the transmission power allocated to the plurality of mobile stations to further increase the throughput of the plurality of mobile stations. Specifically, the power adjustment means 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.

  Also, base station 700 may be used for a base station that performs mapping of bit information to symbols for a plurality of mobile stations by adopting multi-user superposition transmission category 2 (MUST Category 2).

  In the base station according to the above embodiment, partial bit information for a first mobile station of a plurality of mobile stations simultaneously scheduled by the base station is mapped to high priority bits in a symbol after modulation. Thereby, the quality of the signal received from the base station of the first mobile station can be efficiently improved, thereby ensuring the throughput of the entire communication system.

  It will be apparent to one skilled in the art that the present invention can be embodied as a system, apparatus, method or computer program product. Thus, the present invention specifically refers to complete hardware or complete software (including firmware, resident software, microcode, etc.), or generally “components”, “modules”, “devices” in the text. Alternatively, it may be realized in the form of combination of hardware and software, which is referred to as a “system” or the like. Also, in some embodiments, the present invention may be embodied as a computer program product in a computer readable medium, including one or more computer readable program codes.

  Any combination of one or more computer readable media may be employed. Computer readable media may be computer readable signal media or computer readable storage media. A computer readable storage medium may be, for example but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or any combination of the foregoing. More specific examples (non-exhaustive enumerations) of computer readable storage media are electrical connectors with one or more wires, portable computer magnetic disks, hard disks, random access memories (RAMs), read only memories (ROMs) And erasable programmable read only memory (EPROM or flash memory), optical fiber, portable compact disc read only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the above. In the present application, a computer readable storage medium may be any tangible medium that contains or stores programs for use by or in connection with an instruction execution system, apparatus or device.

  A computer readable signal medium comprises a data signal propagated in baseband or as part of a carrier, in which computer readable program code is loaded. This propagated data signal may take each form, including, but not limited to, an electromagnetic signal, an optical signal, or any suitable combination of the above. A computer readable signal medium is a computer readable medium capable of transmitting, propagating or transmitting a program for use by or for use with an instruction execution system, apparatus or device other than a computer readable storage medium. It is also good.

  The flowcharts and block diagrams in the drawings illustrate possible architectural structures, functions and operations of systems, methods and computer program products according to embodiments of the present invention. In this regard, each block in the flowchart or block diagram represents a portion of a module, program section or code that includes executable instructions for implementing one or more predetermined logical functions. It should also be noted that each block in the block diagrams and / or flowcharts and combinations of blocks in the block diagrams and / or flowcharts may be implemented by a dedicated hardware-based system that performs a predetermined function or operation. It may be realized by a combination of hardware and computer instructions which are good or dedicated.

  FIG. 8 shows a general hardware block diagram of a bit to symbol mapping system 800 in accordance with an embodiment of the present invention. Bit to symbol mapping system 800 may be implemented as a base station. In addition, as shown in FIG. 8, the bit-to-symbol mapping system 800 may include a transmitting / receiving unit 810, a storage unit 820, and a processing unit 830.

  The transceiver unit 810 can receive a signal from the mobile station or transmit the signal to the mobile station. Storage 820 may include various types of computer readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory can include, for example, a random access memory (RAM) and / or a cache memory (cache). The non-volatile memory can include, for example, a read only memory (ROM), a hard disk, a flash memory, and the like. The computer readable storage medium can store one or more computer program instructions. For example, storage 820 may store computer program instructions that implement the bit-to-symbol mapping method described in connection with FIGS. 1-6 above. The processing unit 830 may execute the program instructions to implement the functions of the embodiments of the present disclosure and / or other desired functions described above.

Although the embodiments of the present invention have been described above, the above description is illustrative and not exhaustive and is not limited to the embodiments disclosed therein. Numerous changes and modifications will be apparent to those skilled in the art without departing from the scope and spirit of each described embodiment. The selection of terms in the present application is intended to provide the best understanding of the principles of the respective embodiments, practical applications or technical improvements in the market, or to enable those skilled in the art to understand the respective embodiments disclosed herein. belongs to.

Claims (19)

A method of mapping a bit to symbol performed by a base station, comprising:
Mapping the first partial bit information for the first mobile station of the plurality of mobile stations to the high priority bits in the symbol when modulating the plurality of mobile stations simultaneously scheduled by the base station;
Mapping the second partial bit information for the first mobile station to low priority bits in the symbol;
Method, including.   When modulating a plurality of mobile stations simultaneously scheduled by the base station, the method further includes the step of mapping all bit information for a second mobile station of the plurality of mobile stations to high priority bits in a symbol. The method of claim 1.   3. The method of claim 2, wherein the signal to noise ratio of the first mobile station is greater than the signal to noise ratio of the second mobile station.   The method according to claim 2 or 3, further comprising the step of determining the quantity of first partial bit information for the first mobile station according to the modulation scheme for the first mobile station and the second mobile station.   The step of mapping the first partial bit information for the first mobile station among the plurality of mobile stations to the high priority bits in the symbol comprises the steps of: A method according to any one of the preceding claims, comprising the step of mapping to.   The step of mapping the first partial bit information for the first mobile station of the plurality of mobile stations to the high priority bits in the symbol may include, according to a predetermined length, the first partial bit information in the symbol 4. A method according to any one of the preceding claims, comprising mapping to consecutive high priority bits. Acquiring a first partial bit information determination / mapping scheme of the first mobile station according to the channel quality of the plurality of mobile stations;
Informing the plurality of mobile stations of the acquired determination / mapping scheme statically or quasi-statically;
Further include
Informing the obtained determination and mapping scheme to the plurality of mobile stations by radio resource control signaling or physical downlink control channel,
When modulating a plurality of mobile stations simultaneously scheduled by the base station, the step of mapping first partial bit information for a first mobile station of the plurality of mobile stations to high priority bits in a symbol is:
When modulating a plurality of mobile stations simultaneously scheduled by the base station according to the obtained determination and mapping scheme, symbolizing first partial bit information for a first mobile station of the plurality of mobile stations 4. A method according to any one of the preceding claims, comprising the step of mapping to high priority bits in. The method further includes the step of storing in advance the determination / mapping scheme of the first partial bit information of the first mobile station in the base station and the plurality of mobile stations,
When modulating a plurality of mobile stations simultaneously scheduled by the base station, the step of mapping first partial bit information for a first mobile station of the plurality of mobile stations to high priority bits in a symbol is:
When modulating a plurality of mobile stations simultaneously scheduled by the base station according to the determination and mapping scheme of the first partial bit information stored in advance, the first mobile station of the plurality of mobile stations may be 4. A method according to any one of the preceding claims, comprising the step of mapping 1 partial bit information to high priority bits in the symbol.   4. A method according to any one of the preceding claims, wherein the reliability of the information transmission of high priority bits in the symbol is higher than the reliability of the information transmission of low priority bits in the symbol.   The method according to any one of claims 1 to 3, further comprising adjusting transmission power allocated to the plurality of mobile stations to increase the throughput of the plurality of mobile stations. When modulating a plurality of mobile stations simultaneously scheduled by the base station, the first partial bit information for the first mobile station of the plurality of mobile stations is arranged to be mapped to high priority bits in the symbol The first mapping means being
Second mapping means arranged to map second partial bit information for the first mobile station to low priority bits in a symbol;
A base station comprising   When modulating a plurality of mobile stations simultaneously scheduled by the base station, it is arranged to map all bit information for a second mobile station of the plurality of mobile stations to high priority bits in a symbol The base station according to claim 11, further comprising third mapping means.   The base station according to claim 12, wherein the signal to noise ratio of the first mobile station is larger than the signal to noise ratio of the second mobile station.   The apparatus further comprises bit information determining means arranged to determine the quantity of first partial bit information for the first mobile station according to the modulation scheme for the first mobile station and the second mobile station. The base station as described in 12 or 13.   The base station according to any one of claims 11 to 13, wherein the first mapping means maps the first partial bit information to high priority bits in a symbol at predetermined intervals.   The base station according to any one of claims 11 to 13, wherein the first mapping means maps the first partial bit information to consecutive high priority bits in a symbol according to a predetermined length. Scheme determining means arranged to obtain a first partial bit information determination and mapping scheme of the first mobile station according to the channel quality of the plurality of mobile stations;
Transmitting means arranged to statically or semi-statically notify the plurality of mobile stations of the determination / mapping scheme of the first partial bit information of the first mobile station;
And further
The transmitting means notifies the plurality of mobile stations of the obtained determination and mapping scheme through radio resource control signaling or a physical downlink control channel.
When the first mapping means modulates a plurality of mobile stations simultaneously scheduled by the base station according to the obtained determination and mapping scheme, the first mapping means may perform a first operation on the first mobile station among the plurality of mobile stations. The base station according to any one of claims 11 to 13, wherein one partial bit information is mapped to high priority bits in a symbol. It further comprises storage means arranged to store in advance the determination / mapping scheme of the first partial bit information of the first mobile station,
The first mapping means is configured to transmit first partial bit information for the first mobile station among the plurality of mobile stations according to the determination / mapping method of the first partial bit information of the first mobile station stored in advance. A base station according to any one of claims 11 to 13, which maps to high priority bits in a symbol. The base according to any one of claims 11 to 13, further comprising power adjustment means arranged to adjust transmission power allocated to the plurality of mobile stations to increase the throughput of the plurality of mobile stations. Station.