CN104994592B - Multiple access method, Apparatus and system - Google Patents

Abstract

Embodiments of the present invention provide a multiple access method, device and system. The method includes: the network device receives a data packet, and the data packet includes terminal identification information; according to the terminal identification information, querying the correspondence table between the terminal identification information and the broadcast channel, and determining the corresponding relationship between the terminal identification information and the terminal identification information broadcast channel, the determined broadcast channel is one of the preset broadcast channels, and the terminal is any terminal in the terminal group corresponding to the determined broadcast channel; according to the terminal identification information, and send the data packet to the terminal through the determined broadcast channel, so that the terminal uses the modulation parameters of the determined broadcast channel to demodulate the data packet, improving resource usage efficiency Low and reduced signaling overhead.

Description

Multiple access method, device and system

technical field

The present invention relates to communication technology, in particular to a multiple access method, device and system.

Background technique

In the communication network, multiple access refers to multiple terminals connected to the same transmission medium, for example, wireless transmission uses the free space of electromagnetic wave communication, point-to-multipoint coaxial cable (Coaxial Cable) network, allowing Data streams or signals from multiple terminals share the same transmission medium.

Existing wireless and wired communication systems, multiple access technologies mainly include Time Division Multiple Access (Time Division Multiple Access, TDMA), Frequency Division Multiple Access (Frequency Division Multiple Access, FDMA), Code Division Multiple Access (Code Division Multiple Access, CDMA) and Orthogonal Frequency-Division Multiple Access (OFDMA), etc. The multiple access technology mainly divides physical resources into several resource blocks in the time domain, frequency domain, or both in the time domain and frequency domain. The network device allocates resources to each terminal based on the divided resource blocks. The information is sent to the terminal in the form of signaling, which increases signaling overhead.

In addition, there is a multiple access method in the existing wired communication system, which is to use all physical resources as a broadcast channel, and use the same modulation method and modulation parameters (such as modulation order, modulation order such as binary phase) for all terminals. Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), 8QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation), 16QAM, 32QAM, 64QAM, 256QAM, etc.), terminal solution After calling out the bit data, obtain the data frame belonging to the terminal in the upper layer (such as the media access control layer (Media Access Control, MAC)), for example, based on the cable television network (Cable TV, CATV) of the coaxial cable (Coaxial Cable) Data Over Cable Service Interface Specifications (DOCSIS) on the cable or Ethernet Passive Optical Network (EPON, Ethernet Passive Optical Network) based on passive optical network, however, based on all physical resources as a broadcast channel, for All terminals adopt the same modulation mode and multiple access method of modulation parameters, so that the system must use the lowest modulation parameters, which reduces resource utilization efficiency.

Therefore, the prior art has the problems of low resource usage efficiency and increased signaling overhead.

Contents of the invention

Embodiments of the present invention provide a multiple access method, device and system to improve resource usage efficiency and reduce signaling overhead.

On the one hand, a multiple access method is provided, including:

The network device receives a data packet, where the data packet includes identification information of the terminal;

According to the identification information of the terminal, query the correspondence table between the terminal identification information and the broadcast channel, and determine the broadcast channel corresponding to the identification information of the terminal, and the determined broadcast channel is one of a plurality of preset broadcast channels A broadcast channel, where the terminal is any terminal in the terminal group corresponding to the determined broadcast channel;

Sending the data packet to the terminal through the determined broadcast channel according to the identification information of the terminal, so that the terminal demodulates the data packet by using the modulation parameter of the determined broadcast channel.

Another aspect provides a multiple access method, including:

The terminal receives the data packet sent by the network device through the broadcast channel, the data packet includes the identification information of the terminal, and the broadcast channel is stored in the network device according to the correspondence table between the identification information of the terminal and the broadcast channel. The corresponding relationship between the identification information of the terminal and the broadcast channel, the determined broadcast channel corresponding to the identification information of the terminal, the determined broadcast channel is one of the preset broadcast channels, and the terminal is Any terminal in the terminal group corresponding to the determined broadcast channel;

The terminal uses the modulation parameters of the broadcast channel to demodulate the data of the broadcast channel.

Another aspect provides a network device, including:

A first receiving module, configured to receive a data packet, where the data packet includes identification information of the terminal;

The first determination module is configured to query the correspondence table between terminal identification information and broadcast channels according to the identification information of the terminal, and determine the broadcast channel corresponding to the identification information of the terminal, and the determined broadcast channel is a preset One of the multiple broadcast channels, the terminal being any terminal in the terminal group corresponding to the determined broadcast channel;

A first sending module, configured to send the data packet to the terminal through the determined broadcast channel according to the identification information of the terminal, so that the terminal uses the modulation parameters of the determined broadcast channel, demodulating the packet.

Another aspect provides a terminal comprising:

The second receiving module is configured to receive a data packet sent by the network device through a broadcast channel, the data packet includes terminal identification information, and the broadcast channel is a correspondence table between the network device and the broadcast channel according to the identification information of the terminal The corresponding relationship between the identification information of the terminal and the broadcast channel stored in the terminal, the determined broadcast channel corresponding to the identification information of the terminal, the determined broadcast channel is one of the preset broadcast channels, The terminal is any terminal in the terminal group corresponding to the determined broadcast channel;

A demodulation module, configured to use the modulation parameters of the broadcast channel to demodulate the data packets.

Another aspect provides a multiple access system, including the above-mentioned terminal and the above-mentioned network device.

It can be seen from the above technical solution that the network device in the embodiment of the present invention determines the broadcast channel corresponding to the terminal's identification information according to the terminal's identification information contained in the received data packet, and sends the data packet to the terminal through the broadcast channel, The problem of low utilization efficiency of physical resources in the prior art is solved, the utilization efficiency of physical resources can be improved, and signaling overhead can be reduced.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic flowchart of a multiple access method provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of continuous division of broadcast channels in the frequency domain in this embodiment;

FIG. 3 is a schematic diagram of discretely dividing broadcast channels in the frequency domain in this embodiment;

FIG. 4 is a schematic diagram of dividing broadcast channels in the time domain in this embodiment;

FIG. 5 is a schematic diagram of dynamically dividing broadcast channels according to terminal feature information in this embodiment;

FIG. 6 is a schematic diagram of multiple OFDM channels applied in this embodiment;

FIG. 7 is a schematic flowchart of a multiple access method provided by another embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a network device provided by another embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a terminal provided by another embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In existing wireless communication systems, the multiple access technology generally adopts time division multiple access technology, code division multiple access technology or orthogonal frequency division multiple access technology. Divide resources, and assign several Orthogonal Frequency Division Multiplexing (OFDM) symbols or Quadrature Amplitude Modulation (QAM) symbols to each terminal; while CDMA technology is based on spread spectrum ( Spread Spectrum) technology, which allocates physical resources for users based on codes; while OFDA technology divides resources through time domain and frequency domain at the same time, there are various implementation methods in the prior art, such as long-term evolution (Long Term Evolution) The TermEvolution (LTE for short) system divides resources into several resource blocks (ResourceBlock) in both the time domain and the frequency domain, and allocates physical resources for each terminal based on the divided resource blocks.

Existing wired communication systems, for example, cable TV network (CATV, Cable TV) based on coaxial cable (Coaxial Cable) or point-to-multipoint wired network based on passive optical network (PON, Passive Optical Network), many The address access technology mainly uses all physical resources as a broadcast channel (for example, QAM modulation or OFDM modulation mode download waves use the same modulation parameters for different terminals), and all terminal data streams or signals share a broadcast channel.

It can be seen from the technical solutions disclosed in the above prior art that the inventor believes that there are at least the following problems in the prior art:

On the one hand, in the prior art, physical resources are divided into several resource blocks (from the time domain, the frequency domain, or both in the time domain and the frequency domain), and the data bits that can be carried by the divided resource blocks are relatively fixed values, while The length of the data to be transmitted by the network device or the terminal is variable, therefore, the transmitted data cannot fully utilize the allocated resource blocks, resulting in additional waste of resources.

On the other hand, network devices allocate resources to terminals based on divided resource blocks, and need to frequently send resource allocation information to terminals in the form of signaling, which increases signaling overhead.

On the other hand, based on all physical resources as a broadcast channel, the multiple access method uses the same modulation mode and modulation parameters for all terminals, so that the system must use the lowest modulation parameters, which reduces resource usage efficiency.

Therefore, the prior art has the problems of low resource usage efficiency and increased signaling overhead.

In view of the above-mentioned problems in the prior art, embodiments of the present invention provide the following technical solutions, which can improve resource usage efficiency and reduce signaling overhead.

The technical solution of the present invention can be applied to various wired communication systems, for example, based on a coaxial cable (CoaxialCable) cable television network (CATV, Cable TV) or based on a passive optical network (PON, Passive OpticalNetwork) point-to-multiple It can also be applied to a wireless communication system, such as a Long Term Evolution (LTE for short) system or a World Interoperability for Microwave Access (WiMAX for short) system.

The technical scheme of the present invention can be applied to various network devices and terminals, and can be a head-end device in a wired system, or a base station or an access point (Access Point, AP) device in a wireless system; it can be a terminal in a wired system. Terminal equipment, such as CM (Cable Modem), can also be a wireless access terminal, such as a mobile phone, a wireless data card, and the like.

Fig. 1 is a schematic flow diagram of a multiple access method provided by an embodiment of the present invention, as shown in Fig. 1 , including:

101. The network device receives a data packet, where the data packet includes identification information of a terminal.

For example, when any upper-layer network entity needs to send a data packet to the terminal through the network device of this embodiment, it can first send a data packet to the network device of this embodiment, wherein the data packet includes the information for receiving the data packet Identification information of the terminal, where the identification information of the terminal may include but not limited to an IP address, a MAC address, and an Ethernet Passive Optical Network (Ethernet Passive Optic Network, EPON) Logical LinkIdentifier (LLID), Gigabit Passive Optical Network (Gigabit Passive Optic Network, GPON) port identification port ID and other information.

102. According to the identification information of the terminal, query the correspondence table between the identification information of the terminal and the broadcast channel, and determine the broadcast channel corresponding to the identification information of the terminal, and the determined broadcast channel is a plurality of preset broadcast channels For one of the broadcast channels, the terminal is any terminal in the terminal group corresponding to the determined broadcast channel.

In an optional implementation of this embodiment, before step 102, the network device receives the characteristic information of the terminal, and the characteristic information of the terminal may include but not limited to the signal-to-noise ratio and service level of the terminal and bandwidth requirements and other information; according to the characteristic information of the terminal, determine the broadcast channel corresponding to the characteristic information of the terminal; for example, the characteristic information of the terminal also includes the identification information of the terminal, and the network device can A correspondence relationship between the identification information of the terminal and the broadcast channel is established.

During specific implementation, the network device divides the physical resources on the transmission medium shared by multiple terminals into two or more broadcast channels in advance; It also includes the transmission medium used by the multiple access technology in the wired communication system.

After the terminal is powered on, the physical layer training is performed on each preset broadcast channel. The training content of the physical layer may include but not limited to training such as synchronization, channel estimation, and equalization. The terminal obtains the signal-to-noise ratio of the carrier of each broadcast channel separately. The signal-to-noise ratio of each broadcast channel is sent to the network device.

In one embodiment of the present invention, the network device sets the SNR threshold corresponding to each broadcast channel according to the SNR of each broadcast channel sent by each terminal. If any of the SNRs of each broadcast channel sent by the terminal is determined If the signal-to-noise ratio of a broadcast channel is greater than or equal to the preset signal-to-noise ratio threshold of the corresponding broadcast channel, the broadcast channel can be determined as the broadcast channel corresponding to the characteristic information of the terminal.

As a further example, the network device presets the service level threshold of each broadcast channel in the above-mentioned preset broadcast channels. , determine the broadcast channel corresponding to the characteristic information of the terminal.

In an optional implementation manner of this embodiment, before step 102, the network device sets a transmission medium (such as an available carrier) shared by multiple terminals to multiple broadcast channels.

In an optional implementation of this embodiment, Orthogonal Frequency Division Multiplexing (OFDM) technology is used to divide the available carriers in the OFDM channel into multiple broadcast channels. It is assumed that the available carriers in the OFDM channel include 2048 divide these carriers into 4 broadcast channels, and each broadcast channel contains 512 available carriers, and the carrier allocation method can include continuous or discrete, that is, the carrier of a broadcast channel can be 512 continuous available carriers, or 512 available carriers. Discrete distributions are possible. The number of available carriers included in each broadcast channel may also be unequal, for example, 4 broadcast channels include 400, 500, 600 and 548 available carriers respectively.

Fig. 2 is the schematic diagram that present embodiment continuously divides the broadcasting channel on the frequency domain; As shown in Fig. 2, a grid on the horizontal axis represents an Orthogonal Frequency Division Multiplexing OFDM symbol, and a grid on the vertical axis represents 128 carriers, each The 512 carriers in the broadcast channel are continuously distributed on the frequency axis.

Fig. 3 is a schematic diagram of the present embodiment discretely dividing broadcast channels in the frequency domain; The carrier is divided into 4 broadcast channels, and the 4 broadcast channels are separated and distributed on the frequency axis.

In an optional implementation of this embodiment, the OFDM technology is used to divide the available carriers in the OFDM channel into multiple broadcast channels in the time domain. FIG. 4 is a schematic diagram of dividing the broadcast channels in the time domain in this embodiment, as As shown in Figure 4, the available carrier is divided into 4 broadcast channels through the time domain, and each broadcast channel includes 2 consecutive OFDM symbols, so that 8 OFDM symbols are a period, and there are 4 different broadcast channels.

In an optional implementation manner of this embodiment, the above-mentioned network device can dynamically divide the shared available carrier into multiple broadcast channels by using OFDM technology according to the characteristic information of different terminals, and then determine the channel corresponding to the characteristic information of each terminal. broadcast channel.

During specific implementation, the network device can dynamically divide the broadcast channel according to the characteristic information reported by the terminal. The number and position of the carriers contained in the broadcast channel can be dynamically divided according to the actual situation. For example, the OFDM channel contains 2048 available carriers, and the network device can divide them The first 1024 carriers and the last 1024 carriers are divided into 2 broadcast channels respectively, or the first 512 carriers can be divided into 1 broadcast channel, and the middle 1024 and the last 512 carriers can be divided into another 2 broadcast channels. The implementation manner of dividing the broadcast channel is not limited, and the broadcast channel may also be divided discretely or in other ways during specific implementation.

At the same time, the network device can dynamically divide corresponding terminal groups for each broadcast channel according to the characteristic information of different terminals (each broadcast channel corresponds to a terminal group), for example, divide terminals with similar physical layer characteristic information on the broadcast channel into one It should be noted that the number of terminals with similar physical layer characteristic information may be different, resulting in a difference in the number of terminals contained in the terminal group. For example, 20 terminals have similar physical layer characteristic information, and the physical layer characteristic information of the other 100 terminals Similarly, in specific implementation, it is possible to divide a broadcast channel for the aforementioned 20 terminals, add these 20 terminals to the terminal group corresponding to the broadcast channel, divide a broadcast channel for the last 100 terminals, and add these 100 terminals to the broadcast channel The terminal group corresponding to the channel; Figure 5 is a schematic diagram of dynamically dividing the broadcast channel according to the characteristic information of the terminal in this embodiment, as shown in Figure 5, the network device can divide the available carrier into two broadcast channels, and each broadcast channel corresponds to the physical layer Terminal groups with similar feature information.

In another optional implementation manner of this embodiment, the physical resource on the transmission medium shared by multiple terminals includes at least one OFDM channel, such as the physical resource in this embodiment includes multiple OFDM channels, and the bandwidth of each OFDM channel ( Frequency bandwidth) can be the same or different; one or more OFDM channels can be divided into one broadcast channel, and the number of OFDM channels contained in each broadcast channel can be the same or different. 6 is a schematic diagram of multiple OFDM channels used in this embodiment, wherein the bandwidth of each OFDM channel is 6 MHz (megahertz), and each OFDM channel can be continuously or dispersedly distributed in the frequency domain, and each OFDM channel can be distributed in the frequency domain. One OFDM channel is used as one broadcast channel, and two or more OFDM channels are also used as one broadcast channel. During specific implementation, each OFDM channel can be sent synchronously (as shown in FIG. 6 , OFDM symbols are aligned between different OFDM channels), or can be sent asynchronously, independent of each other.

It should be noted that, among the plurality of preset broadcast channels, each broadcast channel includes at least one available carrier, and different broadcast channels cannot include the same available carrier. Each broadcast channel corresponds to a terminal group, and a terminal group includes at least one terminal; different terminal groups can contain the same terminal, for example, the signal-to-noise ratio of two terminals is similar, and according to the signal-to-noise ratio of the The terminals are divided into the same terminal group, and the broadcast channel corresponding to the terminal group can be used. For another example, if the two terminals have different service levels, the two terminals can be divided into different terminal groups, and the two terminals use and belong to each other respectively. The broadcast channel corresponding to the terminal group.

In an optional implementation manner of this embodiment, after the network device determines the broadcast channel corresponding to the characteristic information of the terminal according to the characteristic information of the terminal, it may establish the identification information of the terminal and the broadcast channel Correspondence, during specific implementation, for example, the network device may save the correspondence between the terminal identification information and the broadcast channel in the terminal identification information and broadcast channel correspondence table, so that when the network device receives When the data packet is received, according to the identification information of the terminal in the data packet, query the correspondence table between the identification information of the terminal and the broadcast channel, and obtain the broadcast channel corresponding to the identification information of the terminal.

In an optional implementation of this embodiment, if there are two or more broadcast channels that match a terminal, only one broadcast channel can be used to transmit data packets, and a data packet cannot be divided. broadcast channel for transmission.

During specific implementation, the network device can determine a broadcast channel for data transmission among multiple broadcast channels corresponding to the terminal identification information according to the data transmission requirements of the terminal; for example, the terminal needs a higher signal-to-noise ratio margin (SNRmargin) The broadcast channel downloads data, and the network device can transmit the data packet to the terminal through the corresponding broadcast channel.

The network device can also determine the broadcast channel for transmitting the data packet according to the attributes of the data packet. For example, when downloading a video data packet, the service level of the broadcast channel is relatively high, and the network device can transmit the data packet through a broadcast channel with a higher service level. to the terminal.

The network device can reasonably determine a broadcast channel for data transmission among multiple broadcast channels corresponding to the terminal identification information according to the usage of the broadcast channel, so as to avoid congestion of the broadcast channel.

In an optional implementation of this embodiment, after the above-mentioned network device flexibly divides the physical resources into multiple broadcast channels and the terminal groups corresponding to each broadcast channel according to the characteristic information of different terminals and the specific requirements of the terminals, the The characteristic information of the terminal group corresponding to each broadcast channel is configured with the modulation parameters (such as the modulation order) corresponding to the broadcast channel, which can improve the overall use efficiency of resources.

It should be noted that the configuration of the modulation parameters of the broadcast channel can be realized by configuring the corresponding modulation parameters for each available carrier included in the broadcast channel. This embodiment does not limit whether the modulation parameters of the available carriers in the broadcast channel are the same. Each available carrier can adopt the same modulation parameter for different terminals.

In an optional implementation of this embodiment, after the network device establishes the correspondence between the identification information of the terminal and the broadcast channel, the network device may send the identification information of the broadcast channel to the terminal, so that the terminal uses the modulation parameter of the broadcast channel , to demodulate packets in this broadcast channel.

It should be noted that before or after the network device sends the identification information of the broadcast channel to the terminal, the network device can send the modulation parameters of each broadcast channel to the terminal group corresponding to the broadcast channel in a broadcast or unicast manner. Each terminal, so that the terminal uses the identification information of the broadcast channel sent by the network device to obtain the modulation parameters of the broadcast channel, and further uses the modulation parameters of the broadcast channel to demodulate the data packets transmitted in the broadcast channel, thereby avoiding network Before sending each data packet, the device needs to send a specific message carrying resource allocation information to the terminal to reduce signaling overhead.

It should be noted that, the above modulation parameters of each broadcast channel include modulation parameters of corresponding available carriers in the broadcast channel.

It should be noted that the characteristic information of the above-mentioned terminal includes one or more of signal-to-noise ratio, service level, and bandwidth requirement.

The broadcast channel includes: at least one OFDM symbol in different time domains, or at least one carrier in different frequency domains, or at least one OFDM channel in the frequency domain.

103. Send the data packet to the terminal through the broadcast channel according to the identification information of the terminal, so that the terminal demodulates the data packet by using the modulation parameter of the broadcast channel.

In practical applications, each broadcast channel corresponds to a terminal group, and each terminal group includes at least one terminal. Therefore, the network device can transmit different data packets sent to multiple terminals through the same broadcast channel, that is to say , multiple terminals can jointly use one broadcast channel to obtain their own data packets.

In the actual implementation, in order to make the terminals receiving the data packets recognize their respective data packets, the network device encapsulates the data packets sent to different terminals respectively according to the preset data frame format, and encapsulates each encapsulated The data packet is modulated into the corresponding broadcast channel. It should be noted that the broadcast channel includes multiple available carriers. Therefore, each encapsulated data packet can be modulated onto any available carrier in the corresponding broadcast channel.

In an optional implementation manner of the present invention, the network device may encapsulate the data packet into an Ethernet data frame, and modulate the encapsulated Ethernet data frame onto any available carrier in the broadcast channel.

Table 1 shows the structure of the Ethernet data frame applied in this embodiment;

It should be noted that the above Ethernet data frame format is one of the optional implementation manners of the present invention, and those skilled in the art can understand that this embodiment does not limit the preset data frame format.

It should be noted that, the above methods of modulating each packaged data packet onto the corresponding broadcast channel include but are not limited to existing modulation methods, for example, using OFDM modulation, quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM) or Phase shift keying (Phase Shift Keying, PSK), the data frame is modulated onto the carrier corresponding to each broadcast channel, and the time-frequency domain conversion can be realized by fast Fourier transform or inverse transform (FFT/IFFT).

Among them, the orthogonal signals in OFDM technology are separated at the terminal receiving data by related technology, which can reduce the mutual interference between broadcast channels, and the signal bandwidth on each broadcast channel is smaller than that of the entire broadcast channel (preset The relevant bandwidth of the sum of multiple broadcast channels), therefore, the flat fading of each broadcast channel can eliminate the interference between symbols and achieve channel equalization.

In an optional implementation of this embodiment, when the application scenario or other aspects of the multi-carrier system change (such as adding other noise interference), the bit error rate of the data packet demodulated by the terminal through the corresponding broadcast channel Higher, the terminal can send a characteristic information change message to the network device, wherein the characteristic information change message includes the current characteristic information of the terminal, and the network device can re-determine the corresponding terminal's current characteristic information according to the current characteristic information of the terminal. The broadcast channel, further, according to the re-determined broadcast channel, adjust the correspondence between the identification information of the terminal stored in the above correspondence table and the broadcast channel, and further, send the adjusted identification information of the broadcast channel to the terminal, The terminal demodulates the data packet in the adjusted broadcast channel by using the adjusted modulation parameter of the broadcast channel.

In an optional implementation of this embodiment, the terminal may periodically (for example, every 10 minutes) detect the current feature information, and the application scenario of the multi-carrier system or other aspects change (such as adding other noise interference) , the feature information change message can be sent to the network device in time. The feature information change message includes the current feature information of the terminal, so that the network device can re-determine the broadcast channel corresponding to the current feature information of the terminal. Further, according to the re-determined broadcast channel, adjust the correspondence between the identification information of the terminal stored in the above correspondence table and the broadcast channel, and further, send the adjusted identification information of the broadcast channel to the terminal, so that the terminal can use the adjusted broadcast channel The modulation parameters for demodulate packets in the adjusted broadcast channel.

In an optional implementation of this embodiment, when the application scenario or other aspects of the multi-carrier system change (such as adding other noise interference), the network device adjusts the preset broadcast after receiving the characteristic information change message. The modulation parameters of the channel (such as the modulation order), it should be noted that the preset broadcast channel is the broadcast channel corresponding to the identification information of the terminal stored in the above corresponding list, and the adjusted modulation parameters are sent to the preset broadcast channel. Each terminal in the terminal group corresponding to the broadcast channel is set so that the terminal uses the adjusted modulation parameters of the broadcast channel to demodulate the data packet on the broadcast channel.

The network device in the embodiment of the present invention determines the broadcast channel corresponding to the terminal's identification information according to the terminal's identification information contained in the received data packet, and sends the data packet to the terminal through the broadcast channel, which solves the problem in the prior art. The problem of low utilization efficiency of physical resources can improve the utilization efficiency of physical resources and reduce signaling overhead.

Fig. 7 is a schematic flowchart of a multiple access method provided by another embodiment of the present invention, as shown in Fig. 7, including:

701. The terminal receives a data packet sent by the network device through a broadcast channel, the data packet includes the identification information of the terminal, and the broadcast channel is the terminal stored in the network device according to the correspondence between the terminal identification information and the broadcast channel. The corresponding relationship between the identification information and the broadcast channel, the determined broadcast channel corresponding to the identification information of the terminal, the determined broadcast channel is one of the preset broadcast channels, and the terminal is the determined broadcast channel Any terminal in the terminal group corresponding to the broadcast channel.

In this embodiment, when the network device receives a data packet sent by any upper-layer network entity, according to the terminal identification information contained in the data packet, for example, query the correspondence table between the terminal identification information and the broadcast channel, and determine the the broadcast channel corresponding to the identification information of the terminal, and send the data packet to the terminal through the broadcast channel.

In an optional implementation of this embodiment, before the terminal receives the data packet sent by the network device through the broadcast channel, the terminal may send the characteristic information of the terminal to the network device, so that the network device can determine the connection with the terminal according to the characteristic information of the terminal. The broadcast channel corresponding to the characteristic information of the terminal, establishes a correspondence table between the identification information of the terminal and the broadcast channel; that is, first establishes the corresponding relationship between the identification information of the terminal and the broadcast channel, and sets the identification The correspondence between the information and the broadcast channel is stored in a table of correspondence between terminal identification information and broadcast channels, and the identification information of the broadcast channel corresponding to the characteristic information of the terminal is sent to the terminal.

It should be noted that the network device determines the broadcast channel corresponding to the terminal's characteristic information according to the terminal's characteristic information, and establishes the corresponding relationship between the terminal's identification information and the broadcast channel. For detailed description, please refer to the corresponding Relevant content in step 102 of the embodiment will not be repeated here.

It should be noted that before the terminal receives the data packet sent by the network device through the broadcast channel, the network device can send the modulation parameters of each broadcast channel to any terminal in the terminal group corresponding to the broadcast channel through broadcast or unicast. The terminal uses the identification information of the broadcast channel sent by the network device to obtain the modulation parameter of the broadcast channel, and further uses the modulation parameter of the broadcast channel to demodulate the data packets transmitted in the broadcast channel, thereby preventing the network device from sending Before a data packet, a specific message carrying resource allocation information needs to be sent to the terminal to reduce signaling overhead.

For example, before or after receiving the identification information of the broadcast channel sent by the network device and corresponding to the characteristic information of the terminal, the terminal also receives the modulation parameters of each broadcast channel sent by the network device, and combines the modulation parameters of each broadcast channel with the The correspondence between the identification information corresponding to the broadcast channels is stored in the modulation parameter table.

As a further example, after receiving the identification information of the broadcast channel corresponding to the characteristic information of the terminal sent by the network device, the terminal queries the above-mentioned modulation parameter table according to the identification information of the broadcast channel, and obtains the information corresponding to the identification information of the broadcast channel. modulation parameters.

It should be noted that the modulation parameters of the above-mentioned broadcast channel include the modulation parameters of each available carrier in the corresponding broadcast channel. Each available carrier can use the same modulation parameter for different terminals. In this embodiment, the modulation parameters of each available carrier in the broadcast channel Whether they are the same is not limited.

The feature information of the terminal in this embodiment includes one or more of signal-to-noise ratio, service level, and bandwidth requirement.

The broadcast channel in this embodiment includes: at least one OFDM symbol in different time domains, or at least one carrier in different frequency domains, or at least one OFDM channel in the frequency domain.

702. The terminal demodulates the data packet by using the modulation parameter of the broadcast channel.

In actual situations, each broadcast channel corresponds to a terminal group, and each terminal group includes at least one terminal. Therefore, the network device can transmit different data packets sent to multiple terminals through the same broadcast channel. Multiple terminals A common broadcast channel can be used to obtain their respective data packets.

During specific implementation, in order to obtain the respective data packets, the terminal uses the modulation parameters of the broadcast channel to demodulate the data stream in the broadcast channel, and the data stream includes the network equipment to send to The data packets of each terminal are respectively encapsulated and modulated into corresponding data packets in the broadcast channel; in the demodulated data stream, according to the preset data frame format and the data contained in the data frame format The identification information of the terminal is used to obtain the data packet of the terminal.

The network device in this embodiment can separately encapsulate data packets sent to different terminals according to preset data frames. For detailed description, refer to the relevant content in step 103 of the embodiment corresponding to FIG. 1 , which will not be repeated here.

In an optional implementation of this embodiment, when the application scenario or other aspects of the multi-carrier system change (for example, other noise interference is added), the data packet demodulated by the terminal in the broadcast channel is caused to be erroneous rate is relatively high, the terminal can send a feature information change message to the network device, wherein the feature information change message includes the current feature information of the terminal, and the network device can re-determine the current feature information corresponding to the terminal according to the current feature information of the terminal. further, according to the re-determined broadcast channel, adjust the corresponding relationship between the identification information of the terminal stored in the correspondence table and the broadcast channel, and further, send the adjusted identification information of the broadcast channel to the terminal , so that the terminal uses the adjusted modulation parameters of the broadcast channel to demodulate the data packet in the adjusted broadcast channel.

In an optional implementation of this embodiment, the terminal may periodically (for example, every 10 minutes) detect the current feature information, and the application scenario of the multi-carrier system or other aspects change (such as adding other noise interference) , the feature information change message can be sent to the network device in time. The feature information change message includes the current feature information of the terminal, so that the network device can re-determine the broadcast channel corresponding to the current feature information of the terminal. Further, according to the re-determined broadcast channel, adjust the correspondence between the identification information of the terminal stored in the above correspondence table and the broadcast channel, and further, send the adjusted identification information of the broadcast channel to the terminal, so that the terminal can use the adjusted broadcast channel The modulation parameters for demodulate packets in the adjusted broadcast channel.

In an optional implementation of this embodiment, when the application scenario or other aspects of the multi-carrier system change (such as adding other noise interference), the network device can also adjust the preset The modulation parameters (such as the modulation order) of the broadcast channel. It should be noted that the preset broadcast channel is the broadcast channel corresponding to the identification information of the terminal stored in the above correspondence table, and the adjusted modulation parameters are sent to Each terminal in the terminal group corresponding to the preset broadcast channel is given, so that the terminal uses the adjusted modulation parameters of the broadcast channel to demodulate the data packet on the broadcast channel.

The terminal according to the embodiment of the present invention directly uses the modulation parameters of the broadcast channel to demodulate the data packet according to the broadcast channel preset by the network device and corresponds to the identification information of the terminal, which can solve the problem of low resource usage efficiency in the prior art. Improve resource usage efficiency and reduce signaling overhead.

It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence. Because of the present invention, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In the foregoing embodiments, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

FIG. 8 is a schematic structural diagram of a network device provided in another embodiment of the present invention. As shown in FIG. 8, the network device in this embodiment may include:

The first receiving module 81 is configured to receive a data packet, and the data packet includes identification information of the terminal;

The first determination module 82 is configured to query the correspondence table between terminal identification information and broadcast channels according to the identification information of the terminal, and determine the broadcast channel corresponding to the identification information of the terminal, and the determined broadcast channel is preset One of the multiple broadcast channels, the terminal is any terminal in the terminal group corresponding to the determined broadcast channel;

The first sending module 83 is configured to send the data packet to the terminal through the determined broadcast channel according to the identification information of the terminal, so that the terminal uses the modulation parameters of the determined broadcast channel , to demodulate the packet.

In an optional implementation manner of this embodiment, the first receiving module 81 is further configured to receive the characteristic information of the terminal sent by the terminal;

The network equipment also includes:

The second determination module 84 is configured to determine a broadcast channel corresponding to the characteristic information of the terminal according to the characteristic information of the terminal;

The establishing module 85 is configured to establish a correspondence table between the identification information of the terminal and the broadcast channel, and is specifically configured to save the correspondence between the identification information of the terminal and the broadcast channel in the identification information of the terminal and the broadcast channel. In the corresponding relationship table of the channel. For detailed description, reference may be made to relevant content in step 102 of the embodiment corresponding to FIG. 1 , which will not be repeated here.

In an optional implementation manner of this embodiment, the first sending module 83 is further configured to send the identification information of the broadcast channel to the terminal, so that the terminal obtains the information related to the broadcast channel according to the identification information of the broadcast channel. The modulation parameter corresponding to the identification information of the broadcast channel demodulates the data packet.

It should be noted that, in order to improve the overall utilization efficiency of resources, the network device described in this embodiment flexibly divides physical resources into multiple broadcast channels and each broadcast channel corresponds to For detailed description, refer to the relevant content in step 102 of the embodiment corresponding to FIG. 1 , and details are not repeated here. Then, according to the characteristic information of the terminal group corresponding to each broadcast channel, configure the modulation parameters (such as the modulation order) of the corresponding broadcast channel. Correspondingly, the first sending module 83 is also used to broadcast or unicast the The preset modulation parameters of each broadcast channel are sent to each terminal in the terminal group corresponding to the broadcast channel, so that the terminal uses the identification information of the broadcast channel sent by the network device to obtain the modulation parameters of the broadcast channel, further, The modulation parameters of the broadcast channel are used to demodulate the data packets transmitted in the broadcast channel, thereby avoiding the need for the network device to send a specific message carrying resource allocation information to the terminal before sending each data packet, thereby reducing signaling overhead.

It should be noted that the configuration of the modulation parameters of the broadcast channel by the network device can be realized by configuring the corresponding modulation parameters for each available carrier included in the broadcast channel. In this embodiment, the modulation of each available carrier in the broadcast channel Whether the parameters are the same is not limited, and each available carrier may use the same modulation parameter for different terminals.

In an optional implementation manner of this embodiment, the first receiving module 81 is further configured to receive a feature information change message sent by the terminal, where the feature information change message includes the current feature information of the terminal;

The second determination module 84 is further configured to determine a broadcast channel corresponding to the current characteristic information of the terminal according to the current characteristic information of the terminal;

The establishing module 85 is further configured to adjust the broadcast channel corresponding to the identification information of the terminal stored in the correspondence table according to the broadcast channel corresponding to the current characteristic information of the terminal determined by the second determining module 84. Correspondence;

In an optional implementation manner of this embodiment, the first sending module 83 is further configured to send the identification information of the adjusted broadcast channel to the terminal, and the adjusted broadcast channel is the current feature of the terminal. The broadcast channel corresponding to the message.

In an optional implementation manner of this embodiment, the first receiving module 81 is further configured to receive a feature information change message sent by the terminal, where the feature information change message includes the current feature information of the terminal;

The network device further includes: an adjustment module 86, configured to adjust the identifier of the terminal stored in the correspondence table according to the current characteristic information of the terminal contained in the characteristic information change message received by the first receiving module 81 The modulation parameters of the broadcast channel corresponding to the information;

In an optional implementation manner of this embodiment, the first sending module 83 is further configured to send the modulation parameter adjusted by the adjusting module 86 to the terminal.

In an optional implementation of this embodiment, the first sending module 83 is specifically configured to encapsulate the data packet according to a preset data frame format, and modulate the encapsulated data packet into the broadcast channel.

It should be noted that, in this embodiment, the data packets sent to the terminal are respectively encapsulated according to preset data frames. For detailed description, please refer to the relevant content in step 103 of the embodiment corresponding to FIG. 1 , which will not be repeated here.

It should be noted that the feature information of the above-mentioned terminal includes one or more of signal-to-noise ratio, service level, and bandwidth requirement;

The above broadcast channel includes: at least one OFDM symbol in different time domains, or at least one carrier in different frequency domains, or at least one OFDM channel in frequency domain.

The network device described in this embodiment can specifically implement the multi-carrier transmission method described in the method embodiment shown in FIG. 1 , and its implementation principle and technical effect will not be repeated here.

FIG. 9 is a schematic structural diagram of a terminal provided by another embodiment of the present invention. As shown in FIG. 9, the terminal in this embodiment may include:

The second receiving module 91 is configured to receive a data packet sent by a network device through a broadcast channel, the data packet includes terminal identification information, and the broadcast channel is a correspondence table between the network device according to the terminal identification information and the broadcast channel The corresponding relationship between the identification information of the terminal and the broadcast channel stored in the terminal, the determined broadcast channel corresponding to the identification information of the terminal, the determined broadcast channel is one of the preset broadcast channels, and the The terminal is any terminal in the terminal group corresponding to the determined broadcast channel;

The demodulation module 92 is configured for the terminal to demodulate the data packet by using the modulation parameter of the broadcast channel.

In an optional implementation manner of this embodiment, the terminal further includes:

The second sending module 93 is configured to send the characteristic information of the terminal to the network device, so that the network device determines a broadcast channel corresponding to the characteristic information of the terminal according to the characteristic information of the terminal, and establishes the A correspondence table between the identification information of the terminal and the broadcast channel.

In an optional implementation manner of this embodiment, the second receiving module 91 is further configured to receive the identification information of the broadcast channel sent by the network device.

It should be noted that the network device flexibly divides physical resources into multiple broadcast channels and terminal groups corresponding to each broadcast channel according to the characteristic information of different terminals and the specific requirements of the terminals. For detailed description, please refer to the corresponding embodiment in FIG. 1 Relevant content in step 102 will not be repeated here. Then, according to the characteristic information of the terminal group corresponding to each broadcast channel, configure the modulation parameters (such as the modulation order) of the corresponding broadcast channel, and send the configured modulation parameters of each broadcast channel to the broadcast channel through broadcast or unicast. Each terminal in the terminal group corresponding to the broadcast channel.

For example, before or after the second receiving module 91 receives the identification information of the broadcast channel sent by the network device and corresponding to the characteristic information of the terminal, the second receiving module 91 is also used to receive each broadcast channel sent by the network device The modulation parameter of each broadcast channel is stored in the modulation parameter table in the correspondence between the modulation parameter of each broadcast channel and the identification information of the corresponding broadcast channel;

As a further example, after the second receiving module 91 receives the identification information of the broadcast channel corresponding to the characteristic information of the terminal sent by the network device, the second receiving module 91 is further configured to query the modulation channel according to the identification information of the broadcast channel. The parameter table is used to obtain the modulation parameters corresponding to the identification information of the broadcast channel.

In an optional implementation manner of this embodiment, the second sending module 93 is further configured to send a feature information change message to the network device, where the feature information change message includes the current feature information of the terminal, so that The network device determines the broadcast channel corresponding to the current characteristic information of the terminal according to the current characteristic information of the terminal, and adjusts the broadcast channel stored in the correspondence table according to the broadcast channel corresponding to the current characteristic information of the terminal. a correspondence between the identification information of the terminal and the broadcast channel;

The second receiving module 91 is further configured to receive identification information of the adjusted broadcast channel sent by the network device, where the adjusted broadcast channel is a broadcast channel corresponding to the current feature information of the terminal.

In an optional implementation manner of this embodiment, the second sending module 93 is further configured to send a feature information change message to the network device, where the feature information change message includes the current feature information of the terminal, so that The network device, according to the current characteristic information of the terminal, adjusts the modulation parameters of the broadcast channel corresponding to the identification information of the terminal stored in the correspondence table;

The second receiving module 91 is further configured to receive the adjusted modulation parameter sent by the network device.

In an optional implementation manner of this embodiment, the demodulation module 92 is specifically configured to use the modulation parameters of the broadcast channel to demodulate the data stream in the broadcast channel, and the data stream includes the network device Encapsulate the data packet according to the preset data frame format and modulate it into the data packet in the broadcast channel, in the demodulated data stream, according to the preset data frame format and the The identification information of the terminal in the data frame format is obtained to obtain the data packet of the terminal.

It should be noted that the feature information of the above-mentioned terminal includes one or more of signal-to-noise ratio, service level, and bandwidth requirement;

The above broadcast channel includes: at least one OFDM symbol in different time domains, or at least one carrier in different frequency domains, or at least one OFDM channel in frequency domain.

The terminal described in this embodiment can specifically execute the multi-carrier transmission method described in the method embodiment shown in FIG. 7 , and its implementation principle and technical effect will not be repeated here.

Another embodiment of the present invention provides a multiple access system, including the network device provided in the above embodiment corresponding to FIG. 8 and the terminal provided in the above embodiment corresponding to FIG. 9 . For the detailed description of the network device, refer to the relevant content in the embodiment corresponding to FIG. 8 , and for the detailed description of the terminal, refer to the relevant content in the embodiment corresponding to FIG. 9 , and details are not repeated here.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware, or in the form of hardware plus software functional units.

The above-mentioned integrated units implemented in the form of software functional units may be stored in a computer-readable storage medium. The above-mentioned software functional units are stored in a storage medium, and include several instructions to enable a computer device (which may be a personal computer, server, or network device, etc.) to execute some steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM for short), random access memory (Random Access Memory, RAM for short), magnetic disk or optical disk, etc., which can store program codes. medium.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (19)

1. a multiple access method, it is characterised in that including:

The network equipment receives packet, and described packet includes the identification information of terminal；

According to the identification information of described terminal, inquiry terminal identification information and the mapping table of broadcast channel, determine with described The broadcast channel that the identification information of terminal is corresponding；

By the described broadcast channel determined, described packet is sent to the described terminal corresponding with described identification information, with Make the described terminal corresponding with described identification information utilize the modulation parameter of the described broadcast channel determined, demodulate described data Bag.

Method the most according to claim 1, it is characterised in that the described identification information according to described terminal, inquires about terminal Identification information and the mapping table of broadcast channel, before determining the broadcast channel corresponding with the identification information of described terminal, wrap Include:

Receive the characteristic information of the described terminal that described terminal sends；

According to the characteristic information of described terminal, determine the broadcast channel corresponding with the characteristic information of described terminal；

Set up the identification information of described terminal and the mapping table of described broadcast channel.

Method the most according to claim 2, it is characterised in that the described identification information setting up described terminal and described broadcast After the mapping table of passage, also include:

Receiving the characteristic information change message that described terminal sends, described characteristic information change message includes that described terminal is current Characteristic information；

According to the characteristic information that described terminal is current, determine the broadcast channel that the characteristic information current with described terminal is corresponding, root According to the broadcast channel that the characteristic information current with described terminal is corresponding, adjust the mark of described terminal in described mapping table Information and the corresponding relation of described broadcast channel；

Or according to the characteristic information that described terminal is current, adjust the identification information with described terminal in described mapping table The modulation parameter of corresponding broadcast channel.

4. according to the method according to any one of claim 1-3, it is characterised in that the characteristic information of described terminal includes noise One or more than in, the grade of service and bandwidth demand.

5. according to the method according to any one of claim 1-3, it is characterised in that described broadcast channel includes: different time domain At least one orthogonal frequency division multiplex OFDM symbol, or at least one at least one carrier wave, or frequency domain of different frequency domain is just Hand over frequency division multiplex OFDM passage.

6. a multiple access method, it is characterised in that including:

Terminal receives the packet that the network equipment is sent by broadcast channel, comprises the identification information of terminal in described packet, Described broadcast channel is that the described network equipment is according to the terminal preserved in the mapping table of terminal identification information and broadcast channel The corresponding relation of identification information and broadcast channel, the broadcast channel that the identification information with described terminal that determines is corresponding；

Described terminal utilizes the modulation parameter of the described broadcast channel receiving described packet, demodulates the data of described broadcast channel Bag.

Method the most according to claim 6, it is characterised in that described terminal is received the network equipment and sent by broadcast channel Packet before, including:

The characteristic information of the described terminal described terminal of transmission is to the described network equipment, so that the described network equipment is according to described terminal Characteristic information, determine the broadcast channel corresponding with the characteristic information of described terminal, set up identification information and the institute of described terminal State the mapping table of broadcast channel.

8. according to the method according to any one of claim 6-7, it is characterised in that the characteristic information of described terminal includes noise One or more than in, the grade of service and bandwidth demand.

9. according to the method according to any one of claim 6-7, it is characterised in that described broadcast channel includes: different time domain At least one orthogonal frequency division multiplex OFDM symbol, or at least one at least one carrier wave, or frequency domain of different frequency domain is just Hand over frequency division multiplex OFDM passage.

10. a network equipment, it is characterised in that including:

First receiver module, is used for receiving packet, and described packet includes the identification information of terminal；

First determines module, and for the identification information according to described terminal, inquiry terminal identification information is corresponding with broadcast channel Relation table, determines the broadcast channel corresponding with the identification information of described terminal；

First sending module, for by the described broadcast channel determined, is sent to described packet and described identification information Corresponding described terminal, so that described terminal utilizes the modulation parameter of the described broadcast channel determined, demodulates described packet.

11. network equipments according to claim 10, it is characterised in that described first receiver module, are additionally operable to receive institute State the characteristic information of the described terminal that terminal sends；

The described network equipment also includes:

Second determines module, for according to the characteristic information of described terminal, determines corresponding with the characteristic information of described terminal wide Broadcast passage；

Set up module, for setting up the identification information of described terminal and the mapping table of described broadcast channel.

12. network equipments according to claim 11, it is characterised in that described first receiver module, are additionally operable to receive institute Stating the characteristic information change message that terminal sends, described characteristic information change message includes the feature letter that described terminal is current Breath；

Described second determines module, is additionally operable to the characteristic information current according to described terminal, determines the spy current with described terminal The broadcast channel that reference breath is corresponding；

Described set up module, be additionally operable to according to the described second characteristic information current with described terminal determining that module determines corresponding Broadcast channel, adjust the identification information of described terminal preserved in described mapping table pass corresponding with described broadcast channel System；

Or also include: adjusting module, for the characteristic information current according to described terminal, adjust in described mapping table and protect The modulation parameter of the broadcast channel that the identification information with described terminal deposited is corresponding.

13. according to the network equipment according to any one of claim 10-12, it is characterised in that the characteristic information of described terminal One or more including in signal to noise ratio, the grade of service and bandwidth demand；

Described broadcast channel includes: at least one orthogonal frequency division multiplex OFDM symbol of different time domain, or different frequency domain is at least At least one orthogonal frequency division multiplex OFDM passage in one carrier wave, or frequency domain.

14. 1 kinds of terminals, it is characterised in that including:

Second receiver module, for receiving the packet that the network equipment is sent by broadcast channel, comprises end in described packet The identification information of end, described broadcast channel is the described network equipment mapping table according to terminal identification information Yu broadcast channel The identification information of the terminal of middle preservation and the corresponding relation of broadcast channel, corresponding wide of the identification information with described terminal that determines Broadcast passage；

Demodulation module, for utilizing the modulation parameter of the described broadcast channel receiving described packet, demodulates described packet.

15. terminals according to claim 14, it is characterised in that also include:

Second sending module, for sending the characteristic information of described terminal to the described network equipment, so that described network equipment root According to the characteristic information of described terminal, determine the broadcast channel corresponding with the characteristic information of described terminal, set up the mark of described terminal Knowledge information and the mapping table of described broadcast channel.

16. terminals according to claim 15, it is characterised in that described second sending module, are additionally operable to described network Equipment sends characteristic information change message, and described characteristic information change message includes the characteristic information that described terminal is current, with Make the described network equipment according to the current characteristic information of described terminal, determine corresponding wide of the characteristic information current with described terminal Broadcast passage, according to the broadcast channel that the characteristic information current with described terminal is corresponding, adjust preservation in described mapping table The identification information of described terminal and the corresponding relation of described broadcast channel；

Or described second sending module, is additionally operable to send characteristic information change message to the described network equipment, and described feature is believed Breath change message includes the characteristic information that described terminal is current, so that the described network equipment is according to the current feature of described terminal Information, adjusts the modulation parameter of broadcast channel corresponding to the identification information with described terminal preserved in described mapping table.

17. according to the terminal according to any one of claim 14-16, it is characterised in that described demodulation module, specifically for profit By the modulation parameter of described broadcast channel, demodulating the data stream in described broadcast channel, described data stream includes described network After described packet is packaged processing by equipment according to the data frame format preset and modulate the number in described broadcast channel According to bag, in the described data stream demodulated, according to the terminal in described default data frame format and described data frame format Identification information, obtain the packet of described terminal.

18. according to the terminal according to any one of claim 14-16, it is characterised in that the characteristic information of described terminal includes One or more in signal to noise ratio, the grade of service and bandwidth demand；Described broadcast channel includes: at least one of different time domain is just Hand at least one OFDM in frequency division multiplex OFDM symbol, or at least one carrier wave, or frequency domain of different frequency domain OFDM passage.

19. 1 kinds of multiple access systems, it is characterised in that include the network equipment and terminal；

The described network equipment receives packet, and described packet includes the identification information of described terminal；

The described network equipment is according to the identification information of described terminal, inquiry terminal identification information and the corresponding relation of broadcast channel Table, determines the broadcast channel corresponding with the identification information of described terminal；

Described packet, according to the identification information of described terminal, by the described broadcast channel determined, is sent out by the described network equipment Give described terminal；

Described terminal receives the packet that the described network equipment is sent by broadcast channel, utilizes the described broadcast channel determined Modulation parameter, demodulates described packet.