WO2008037811A1 - Method for sending information from base station to relay station - Google Patents

Method for sending information from base station to relay station Download PDF

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Publication number
WO2008037811A1
WO2008037811A1 PCT/EP2007/060395 EP2007060395W WO2008037811A1 WO 2008037811 A1 WO2008037811 A1 WO 2008037811A1 EP 2007060395 W EP2007060395 W EP 2007060395W WO 2008037811 A1 WO2008037811 A1 WO 2008037811A1
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WO
WIPO (PCT)
Prior art keywords
base station
message
additional message
terminal
information sent
Prior art date
Application number
PCT/EP2007/060395
Other languages
French (fr)
Inventor
Hui Li
Ping Li
Yi Sheng Xue
Wolfgang Zirwas
Original Assignee
Nokia Siemens Networks Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Siemens Networks Gmbh & Co. Kg filed Critical Nokia Siemens Networks Gmbh & Co. Kg
Publication of WO2008037811A1 publication Critical patent/WO2008037811A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/345—Modifications of the signal space to allow the transmission of additional information
    • H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
    • H04L27/3472—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel by switching between alternative constellations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/345—Modifications of the signal space to allow the transmission of additional information
    • H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
    • H04L27/3483—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel using a modulation of the constellation points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3488—Multiresolution systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow

Definitions

  • the present invention relates to the technical field of wireless communication, and particularly to a method for sending information from a base station to a relay station.
  • Wimax World Interoperability for Microwave Access (Wimax) based on IEEE (Institute of Electrical and Electronics Engineers) 802.16 standards has become a highly competitive and popular technology.
  • Wimax is a technology of Wireless Metropolitan Area Network (WMAN) , which is a new space interface standard proposed for microwave and millimeter waveband.
  • Wimax have the advantages of high spectrum utilization rate, wide coverage, and high data rate. More importantly, Wimax has combined both the bandwidth advantage of conventional wideband based on cable access and the flexibility and mobility of wireless access, and it can also provide various services capable of meeting high QoS (Quality of Service) standards, including therein timely transmission for relay-sensitive services.
  • QoS Quality of Service
  • a relay task group scheme has been proposed by IEEE in 802.16j standards, which is intended to introduce Relay Station (RS) technology.
  • RS Relay Station
  • a relay station is deployed in a wireless cellular system for enhancing coverage and increasing capacities as far as a base station is concerned, and for reducing the transmitting power as far as a terminal is concerned (a subscriber station SS, or a mobile station MS) , and for lowering the influence of shading effects.
  • a control mode for a relay network in which all communications within the coverage range are controlled by a base station (BS) , particularly, the BS sends information to all terminals within the coverage range, including the information sent by the BS to an RS, and the RS sending the information to the terminals.
  • BS base station
  • the controls of the RS such as changes to the configuration of the RS or changes to the configuration parameters of two-hop users via the RS, or the support to some services, such as for those relay-sensitive services or the support to the terminals in the switching process, etc. need to ensure information being sent in a timely manner from the BS to the RS. Then, a very important point here is that only when the timely transmission of information from the BS to the RS is ensured, can the timely transmission of information from the RS to the terminals be ensured.
  • An object of the present invention is to provide a method for sending information from a base station to a relay station, to ensure the timely transmission of information from a BS to an RS, so as to further ensure the timely transmission of information from the RS to terminals.
  • the method for sending information from a base station to a relay station is realized as follows : a method for sending information from a base station to a relay station, comprising: taking information sent from the base station to the relay station and information sent from the base station to a single- hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using a hierarchical modulation mode; and transmitting the hierarchically modulated information by the base station to the relay station.
  • Said step of taking information sent from the base station to the relay station and information sent from the base station to a single-hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using a hierarchical modulation mode comprises: selecting the single-hop terminal according to a link condition and the modulation mode; and taking the information sent from the base station to the relay station as the additional message, taking the information sent from the base station to the single-hop terminal as the basic message, and superposing the additional message on the basic message of the selected single-hop terminal, and then modulating the superposed information by using the hierarchical modulation mode.
  • Said step of selecting the single-hop terminal according to a link condition and the modulation mode comprises: selecting the single-hop terminal according to channel quality information and/or channel status information and/or a testing report of the base station, combined with the modulation mode.
  • Said step of taking information sent from the base station to the relay station and information sent from the base station to the single-hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using the hierarchical modulation mode comprises: selecting a connection to the single-hop terminal according to a condition of a link and the modulation mode; and taking the information sent from the base station to the relay station as the additional message, taking the information sent from the base station to the selected connection to the single-hop terminal as the basic message, and superposing the additional message on the basic message of the selected single- hop terminal, and then modulating by the hierarchical modulation mode.
  • Said step of taking information sent from the base station to the relay station and information sent from the base station to the single-hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using the hierarchical modulation mode comprises: taking the information sent from the base station to the relay station as the additional message, taking the information sent from the base station to different connections to at least one single-hop terminal as the basic message, and superposing said additional message and basic message onto the corresponding different connections of said at least one single-hop terminal, then modulating by the hierarchical modulation mode.
  • Said step of taking information sent from the base station to the relay station and information sent from the base station to the single-hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using the hierarchical modulation mode comprises: taking the information sent from the base station to different relay stations as the additional message, taking the information sent from the base station to the connection of the single-hop terminal as the basic message, and superposing the additional message and the basic message onto the same connection of the single-hop terminal, then modulating by the hierarchical modulation mode.
  • Said step of superposing the additional message and the basic message together and modulating by using the hierarchical modulation mode comprises: selecting corresponding signed distances according to relative qualities of the link between the base station and the relay station and the link between the base station and the single-hop terminal; and mapping the additional message and the basic message to different layers of a signal constellation diagram respectively by using the selected signed distances.
  • Said step of mapping the additional message and the basic message to different layers of the signal constellation diagram respectively by using the selected signed distances further comprises : dividing said single-hop terminals into different groups according to the different signed distances selected.
  • Said step of mapping the additional message and the basic message to different layers of a signal constellation diagram respectively by using the selected signed distances further comprises : dividing the different connections of the at least one selected signal-hop terminal into different groups according to the different signed distances selected.
  • a corresponding modulation mode for the additional message is selected according to a carrying capacity of the link from the base station to the terminal.
  • Said method further comprises: dynamically updating said terminal by the base station according to collected terminal online information. Said method further comprises: receiving and restoring said additional message by the relay station.
  • Said additional message comprises signaling information and/or delay-sensitive information.
  • Said method further comprises: adjusting a transmitting power by the relay station according to said additional message.
  • Said method further comprises: adjusting by the relay station configuration parameters of the relay station or the terminal according to said additional message .
  • This method is used for a situation in which, when the terminal is switched, it needs timely support provided by a relay station to ensure that the communication link of the terminal is not interrupted.
  • the present invention information sent from the base station to the relay station and information sent from the base station to a single-hop terminal are taken as the additional message and the basic message respectively, and the additional message and the basic message are superposed so as to be modulated by the hierarchical modulation mode, then the hierarchically modulated information is sent by the base station to the relay station.
  • the present invention facilitates timely transmission of signaling information and/or relay-sensitive service data to the relay station, so as to further enhance the system performance, and by using the present invention, it can further enhance the utilization rate of the system resources without employing extra system resources, thereby, that is, to enhance the spectrum efficiency.
  • Fig. 1 is a schematic diagram of single-hopping and multi- hopping
  • Fig. 2 is a flowchart for achieving the information transmission from the base station to the relay station in the present invention.
  • Fig. 3 is a signal mapping constellation diagram of the hierarchical modulation mode in the present invention.
  • the core concept of the present invention is to provide a method for sending information from a base station to a relay station.
  • the information sent from the base station to the relay station is taken as an additional message
  • the information sent from the base station to a single-hop terminal is taken as a basic message
  • the additional message and the basic message are superposed so as to be modulated by a hierarchical modulation mode, and then to be transmitted to the relay station.
  • Hierarchical modulation technology which hierarchically modulates two pieces of separated information by treating them as a basic message and an additional message respectively.
  • the concept of the hierarchical modulation is to: divide the logic service into two data streams in a physical layer, one of which is a basic message stream, and the other an additional message stream, and for these two data streams to be mapped to different layers of a signal constellation diagram respectively.
  • the data stream of the additional message layer can only be received by the receivers close to the transmitter, while the data stream of the basic message layer can be received by receivers including those far away from the transmitter and those close to the transmitter .
  • terminals can be divided into various types such as single-hop terminals, two- hop terminals and multi-hop terminals, according to the numbers of the links that the information traveled before reaching the terminal.
  • a straight line represents a link
  • the terminal 1 is a single-hop terminal
  • the information travels via a link 2A between the base station and the relay station and a link 2B between the relay station and the terminal before arriving the terminal 2
  • the terminal 2 is a two-hop terminal
  • the rest can be deduced by analogy for a multi-hop terminal.
  • the terminal described in the present invention is a single-hop terminal.
  • Figure 2 shows a flowchart of the method for achieving the information transmission from a base station to a relay station .
  • Step 201 taking the information sent from the BS to the RS and the information sent from the base station to the single-hop terminal as an additional message and a basic message respectively, and superposing the additional message an the basic message so as to be modulated in a hierarchical modulation mode.
  • Figure 3 shows the constellation mapping diagram of the hierarchical modulation mode.
  • said basic message and additional message are mapped to different layers of the signal constellation diagram respectively.
  • the hierarchical modulation is performed according to the amount of the 2 bits additional message, and the output is l+d/2, l+j*d/2, l-d/2 or l-j*d/2
  • the information sent to the RS can be 4 bits.
  • the signed distance d is an important parameter and can be determined according to the relative quality of the link between the BS and the RS and the link between the BS and the single-hop terminal. The better is the quality of the selected terminal channel, the larger d can be made, and accordingly, the larger is the amount of information that can be superposed.
  • the interference caused by the additional message can be dispersed or attenuated, and the terminal can successfully receive the basic message, meanwhile, the RS can receive and restore the basic message and the additional message.
  • this hierarchical modulation mode can be adopted so that the relay station can receive more information, that is, the relay station can receive additionally the additional message in the hierarchical modulation without affecting the single-hop terminal receiving the basic message that needs to be received.
  • the relay station can also receive the basic message in the hierarchical modulation.
  • the superposed additional message can generate certain interference to the basic message, and when the interference becomes excessive, it can lead to the decrease of the basic message quality received by the terminals, therefore, it is very important to reduce the interference while adopting the hierarchical modulation mode.
  • the hierarchical modulation in the present invention can be adopted in the following modes:
  • Mode IA selecting the single-hop terminal according to the link condition and the encoding mode, taking information sent from the base station to the relay station as an additional message, taking information sent from the base station to a single-hop terminal as a basic message, superposing the additional message onto the basic message of the selected single-hop terminal, and modulating the same in the hierarchical modulation mode.
  • the link condition mentioned here particularly includes reported channel quality information (CQI), channel state information (CSI), and the testing report regarding the link from the BS. Then, one single-hop terminal can be selected according to the CQI quality and/or CSI quality of the terminal and/or the testing report from the BS.
  • the general principle for the selection is to select the single-hop terminal with good link condition.
  • the RS can receive the additional message of this modulation mode and correctly demodulate it, and the terminal can receive the basic message and correctly demodulate it, without being subjected to the effects from the additional message superposed thereon.
  • Mode IB selecting the single-hop terminal according to the link condition and the modulation mode, and taking information sent from the base station to the relay station as the additional message, and taking information sent from the base station to the single-hop terminal as the basic message, and superposing the additional message on said basic message, then modulating the same in the hierarchical modulation mode.
  • the communication between the base station and the terminal is achieved by a connection
  • different services or applications can correspond to different connections, and therefore there can be several connections between the base station and the terminal.
  • the additional message is superposed onto the basic message of the selected connection, and it is modulated by using a hierarchical modulation mode.
  • Mode 1C taking the information sent from the base station to the relay station as the additional message, and taking the information sent from the base station to one single-hop terminal as the basic message, and superposing the additional message and the basic message on different connections of the single-hop terminal, and modulating it by using the hierarchical modulation mode.
  • Mode ID taking information sent from the base station to the relay station as the additional message, and taking information sent from the base station to a plurality of single-hop terminals as the basic message, and superposing the additional message and the basic message on different connections of said plurality of single-hop terminals, and modulating it by using the hierarchical modulation mode.
  • Mode IE taking information sent from the base station to the relay station as the additional message, and taking information sent from the base station to the single-hop terminal as the basic message, and superposing the additional message and the basic message on the same connection of the single-hop terminal, and modulating it by using the hierarchical modulation mode.
  • the method for reducing the effects to the basic message caused by hierarchically modulating the superposed additional message on the single-hop terminal link further comprises: updating the selected single-hop terminal.
  • the base station dynamically updates the single-hop terminal according to the collected online information of the terminal.
  • It can be updated dynamically, namely, every time the base station needs to send the additional message, it can change the single-hop terminal selected, so as to ensure the selected single-hop terminal is always the one having better results in transmitting the additional message after having being superposed and hierarchically modulated. For example, it can be determined according to the number of additional messages transmitted, or changed according to the link quality of the selected single-hop terminal and the modulation mode.
  • the method for reducing the effects to the basic message caused by hierarchically modulating the superposed additional message further comprises: properly selecting the value of signed distance d.
  • a corresponding d value is selected according to the relative qualities of the link between the base station and the relay station and the link between the base station and the single-hop terminal.
  • Said additional message and the basic message can be mapped to different layers of a signal constellation diagram respectively by using the selected d value.
  • the single-hop terminal operated by hierarchical modulation can be divided into different groups by properly selected d values, and different groups have different single-hop terminals. The larger the d value for the selected group, the higher are the user channel quality requirements of a corresponding group, and therefore the users with relative better channel quality are selected for the group. The smaller the d value, the lower are the user channel quality requirements of a corresponding group, so selecting the users with relative less good channel quality are selected for the group.
  • Different groups can have different single-hop terminals, and also have different connections.
  • the modulation mode corresponding to the additional message can be selected according to the carrying capacity of the link between the base station and the terminal.
  • the modulation mode having correspondingly high code efficiency for encoding the additional message of the link can be selected, otherwise, when the carrying capacity of the link is low, the modulation mode having correspondingly low code efficiency for encoding the additional message of the link can be selected.
  • the information sent from the base station to the relay station and information sent from the base station to a single-hop terminal are taken as the additional message and basic message respectively, and the additional message and the basic message are superposed so as to be modulated by using the hierarchical modulation mode.
  • the additional message and the basic message are superposed so as to be modulated by using the hierarchical modulation mode.
  • Step 202 the BS sends the hierarchically modulated information to the RS.
  • the BS superposes the additional message to be transmitted to the RS onto the basic message so as to be hierarchically modulated together and then transmitted, the RS receives the modulated information, and it can demodulate from it the additional message sent to the RS.
  • the terminal can also demodulate the basic message sent to the terminal after having received the information. Since the interference caused by superposing the additional message is reduced by using various modes in the above steps, it can ensure that the terminal correctly receives and demodulates the basic message sent to the terminal. Thus, the BS achieves timely transmission of the additional message to the RS.
  • the additional message can be the information from the network side informing the RS to change the configuration, or for implementing an urgent remedy to a terminal during its switching. For example, sometimes it is necessary for the RS configuration to be changed in a timely manner, such as when the transmitting power needs to be increased or decreased temporarily.
  • One case of implementing an urgent remedy to a terminal during its switching is that: one user communicates with the base station through the relay station, during the time that the user is switching from this relay station to another relay station, it may happen that a service interruption caused by an abrupt change of the channel quality or a certain process runs into a fault during the switching, at this moment, in order to built a new connection for the user without interrupting the user' s connection, it is required to have extra and urgent signaling interaction between the base station, the relay station and the terminal.
  • the method of the present invention can be adopted, and the additional message to be sent to the RS is superposed on the basic message so as to be hierarchically modulated together by using the hierarchical modulation mode and then transmitted to the RS.
  • the method of the present invention can also be used for the transmission of the relay-sensitive data services. Since the method can flexibly superpose said data service as the additional message to be sent to the RS onto the basic message so as to be hierarchically modulated together and then to be sent to the RS in a timely manner, which reduces the delay on the link from the BS to the RS. Similarly, configuration parameters of a relay station or a terminal can also be adjusted by the method of the present invention.
  • the present invention can also be used in cases when the system resources are in short supply.
  • a BS needs to send information to an RS at a moment the system resources are in short supply, and there are no extra system resources available for allocating to the transmission of the information at this time, this purpose can be achieved by using the method of the present invention.
  • the present invention can also be used. Since the link between the base station and the terminal is used when the information sent to the terminal from the base station is taken as the basic message, and the information sent to the RS from the base station is taken as the additional message, and together with the basic message they are hierarchically modulated after having been superposed, the spectrum utilization rate is improved.
  • the information sent from the base station to the relay station is taken as the additional message
  • the information sent from the base station to the single-hop terminal is taken as the basic message
  • the additional message and the basic message are superposed together so as to be hierarchically modulated, then the hierarchically modulated information is transmitted to the relay station.

Abstract

The present invention provides a method for sending information from a base station to a relay station, comprising taking information from the base station to the relay station and information from the base station to a single-hop terminal as the additional message and the basic message respectively, superposing the additional message and the basic message together for modulating by using a hierarchical modulation mode; and sending the hierarchically modulated information by the base station to the relay station. By using the present invention, signaling information and/or delay sensitive operation data can be sent from the base station to the relay station in a timely manner, thus to improve system performance, and furthermore, by using the present invention it is possible not to employ additional system resources, so as to improve the utilization rate of system resources, namely, to improve the frequency spectrum efficiency.

Description

Method for Sending Information from Base Station to Relay Station
Technical Field
The present invention relates to the technical field of wireless communication, and particularly to a method for sending information from a base station to a relay station.
Background Art
In recent years, with the fast development of communication technologies, World Interoperability for Microwave Access (Wimax) based on IEEE (Institute of Electrical and Electronics Engineers) 802.16 standards has become a highly competitive and popular technology. Wimax is a technology of Wireless Metropolitan Area Network (WMAN) , which is a new space interface standard proposed for microwave and millimeter waveband. Wimax have the advantages of high spectrum utilization rate, wide coverage, and high data rate. More importantly, Wimax has combined both the bandwidth advantage of conventional wideband based on cable access and the flexibility and mobility of wireless access, and it can also provide various services capable of meeting high QoS (Quality of Service) standards, including therein timely transmission for relay-sensitive services.
Recently, a relay task group scheme has been proposed by IEEE in 802.16j standards, which is intended to introduce Relay Station (RS) technology. A relay station is deployed in a wireless cellular system for enhancing coverage and increasing capacities as far as a base station is concerned, and for reducing the transmitting power as far as a terminal is concerned (a subscriber station SS, or a mobile station MS) , and for lowering the influence of shading effects. In order to achieve the above purposes, there is a control mode for a relay network in which all communications within the coverage range are controlled by a base station (BS) , particularly, the BS sends information to all terminals within the coverage range, including the information sent by the BS to an RS, and the RS sending the information to the terminals. During this process, the controls of the RS, such as changes to the configuration of the RS or changes to the configuration parameters of two-hop users via the RS, or the support to some services, such as for those relay-sensitive services or the support to the terminals in the switching process, etc. need to ensure information being sent in a timely manner from the BS to the RS. Then, a very important point here is that only when the timely transmission of information from the BS to the RS is ensured, can the timely transmission of information from the RS to the terminals be ensured.
Summary of the invention
An object of the present invention is to provide a method for sending information from a base station to a relay station, to ensure the timely transmission of information from a BS to an RS, so as to further ensure the timely transmission of information from the RS to terminals.
In order to solve the abovementioned technical problems, the method for sending information from a base station to a relay station provided by the present invention is realized as follows : a method for sending information from a base station to a relay station, comprising: taking information sent from the base station to the relay station and information sent from the base station to a single- hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using a hierarchical modulation mode; and transmitting the hierarchically modulated information by the base station to the relay station.
Said step of taking information sent from the base station to the relay station and information sent from the base station to a single-hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using a hierarchical modulation mode comprises: selecting the single-hop terminal according to a link condition and the modulation mode; and taking the information sent from the base station to the relay station as the additional message, taking the information sent from the base station to the single-hop terminal as the basic message, and superposing the additional message on the basic message of the selected single-hop terminal, and then modulating the superposed information by using the hierarchical modulation mode.
Said step of selecting the single-hop terminal according to a link condition and the modulation mode comprises: selecting the single-hop terminal according to channel quality information and/or channel status information and/or a testing report of the base station, combined with the modulation mode.
Said step of taking information sent from the base station to the relay station and information sent from the base station to the single-hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using the hierarchical modulation mode comprises: selecting a connection to the single-hop terminal according to a condition of a link and the modulation mode; and taking the information sent from the base station to the relay station as the additional message, taking the information sent from the base station to the selected connection to the single-hop terminal as the basic message, and superposing the additional message on the basic message of the selected single- hop terminal, and then modulating by the hierarchical modulation mode.
Said step of taking information sent from the base station to the relay station and information sent from the base station to the single-hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using the hierarchical modulation mode comprises: taking the information sent from the base station to the relay station as the additional message, taking the information sent from the base station to different connections to at least one single-hop terminal as the basic message, and superposing said additional message and basic message onto the corresponding different connections of said at least one single-hop terminal, then modulating by the hierarchical modulation mode.
Said step of taking information sent from the base station to the relay station and information sent from the base station to the single-hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using the hierarchical modulation mode comprises: taking the information sent from the base station to different relay stations as the additional message, taking the information sent from the base station to the connection of the single-hop terminal as the basic message, and superposing the additional message and the basic message onto the same connection of the single-hop terminal, then modulating by the hierarchical modulation mode. Said step of superposing the additional message and the basic message together and modulating by using the hierarchical modulation mode comprises: selecting corresponding signed distances according to relative qualities of the link between the base station and the relay station and the link between the base station and the single-hop terminal; and mapping the additional message and the basic message to different layers of a signal constellation diagram respectively by using the selected signed distances.
Said step of mapping the additional message and the basic message to different layers of the signal constellation diagram respectively by using the selected signed distances further comprises : dividing said single-hop terminals into different groups according to the different signed distances selected.
Said step of mapping the additional message and the basic message to different layers of a signal constellation diagram respectively by using the selected signed distances further comprises : dividing the different connections of the at least one selected signal-hop terminal into different groups according to the different signed distances selected.
A corresponding modulation mode for the additional message is selected according to a carrying capacity of the link from the base station to the terminal.
Said method further comprises: dynamically updating said terminal by the base station according to collected terminal online information. Said method further comprises: receiving and restoring said additional message by the relay station.
Said additional message comprises signaling information and/or delay-sensitive information.
Said method further comprises: adjusting a transmitting power by the relay station according to said additional message.
Said method further comprises: adjusting by the relay station configuration parameters of the relay station or the terminal according to said additional message .
This method is used for a situation in which, when the terminal is switched, it needs timely support provided by a relay station to ensure that the communication link of the terminal is not interrupted.
It can be seen from the technique solution provided by the present invention that, in the present invention, information sent from the base station to the relay station and information sent from the base station to a single-hop terminal are taken as the additional message and the basic message respectively, and the additional message and the basic message are superposed so as to be modulated by the hierarchical modulation mode, then the hierarchically modulated information is sent by the base station to the relay station. By using the present invention, it facilitates timely transmission of signaling information and/or relay-sensitive service data to the relay station, so as to further enhance the system performance, and by using the present invention, it can further enhance the utilization rate of the system resources without employing extra system resources, thereby, that is, to enhance the spectrum efficiency.
Brief Description of the Drawings
Fig. 1 is a schematic diagram of single-hopping and multi- hopping;
Fig. 2 is a flowchart for achieving the information transmission from the base station to the relay station in the present invention; and
Fig. 3 is a signal mapping constellation diagram of the hierarchical modulation mode in the present invention.
Practical Embodiments
The core concept of the present invention is to provide a method for sending information from a base station to a relay station. Particularly, the information sent from the base station to the relay station is taken as an additional message, and the information sent from the base station to a single-hop terminal is taken as a basic message, and the additional message and the basic message are superposed so as to be modulated by a hierarchical modulation mode, and then to be transmitted to the relay station.
Those skilled in the art know that there is a hierarchical modulation technology in the prior art, which hierarchically modulates two pieces of separated information by treating them as a basic message and an additional message respectively. The concept of the hierarchical modulation is to: divide the logic service into two data streams in a physical layer, one of which is a basic message stream, and the other an additional message stream, and for these two data streams to be mapped to different layers of a signal constellation diagram respectively. Generally, after the mapping the signed distance of the data of the basic message stream is larger than that of the additional message layer, accordingly, the data stream of the additional message layer can only be received by the receivers close to the transmitter, while the data stream of the basic message layer can be received by receivers including those far away from the transmitter and those close to the transmitter .
Those skilled in the art also know that terminals can be divided into various types such as single-hop terminals, two- hop terminals and multi-hop terminals, according to the numbers of the links that the information traveled before reaching the terminal. As is shown in Fig. 1, in which a straight line represents a link, it can be seen that the information only travels via a link 1 between the base station and the terminal 1 before arriving at the terminal 1, then the terminal 1 is a single-hop terminal; while the information travels via a link 2A between the base station and the relay station and a link 2B between the relay station and the terminal before arriving the terminal 2, that is, it travels via two links, then the terminal 2 is a two-hop terminal, and the rest can be deduced by analogy for a multi-hop terminal. The terminal described in the present invention is a single-hop terminal.
In order for those skilled in the art to understand the present invention better, hereinafter the present invention is further described by reference to the drawings and an embodiment .
Figure 2 shows a flowchart of the method for achieving the information transmission from a base station to a relay station .
Step 201: taking the information sent from the BS to the RS and the information sent from the base station to the single-hop terminal as an additional message and a basic message respectively, and superposing the additional message an the basic message so as to be modulated in a hierarchical modulation mode.
As mentioned above, there is a hierarchical modulation technology in the prior art, which can hierarchically modulate two pieces of separated information by taking them as a basic message and an additional message. In the present invention the information sent from the BS to the single-hop terminal is taken as a basic message, and the information sent from the BS to the RS is taken as an additional message, and the additional message and the basic message are superposed so as to be modulated in the hierarchical modulation mode.
Figure 3 shows the constellation mapping diagram of the hierarchical modulation mode.
As is shown in Fig. 3, said basic message and additional message are mapped to different layers of the signal constellation diagram respectively. Assuming that the 2 bits information sent to the terminal 2 is "1", the hierarchical modulation is performed according to the amount of the 2 bits additional message, and the output is l+d/2, l+j*d/2, l-d/2 or l-j*d/2, then the information sent to the RS can be 4 bits. The signed distance d is an important parameter and can be determined according to the relative quality of the link between the BS and the RS and the link between the BS and the single-hop terminal. The better is the quality of the selected terminal channel, the larger d can be made, and accordingly, the larger is the amount of information that can be superposed. By properly selecting the parameter d, the interference caused by the additional message can be dispersed or attenuated, and the terminal can successfully receive the basic message, meanwhile, the RS can receive and restore the basic message and the additional message. In a network deployed with a relay station, there is generally better link quality between the base station and the relay station, therefore, this hierarchical modulation mode can be adopted so that the relay station can receive more information, that is, the relay station can receive additionally the additional message in the hierarchical modulation without affecting the single-hop terminal receiving the basic message that needs to be received. Furthermore, the relay station can also receive the basic message in the hierarchical modulation.
The superposed additional message can generate certain interference to the basic message, and when the interference becomes excessive, it can lead to the decrease of the basic message quality received by the terminals, therefore, it is very important to reduce the interference while adopting the hierarchical modulation mode. By way of example, the hierarchical modulation in the present invention can be adopted in the following modes:
Mode IA: selecting the single-hop terminal according to the link condition and the encoding mode, taking information sent from the base station to the relay station as an additional message, taking information sent from the base station to a single-hop terminal as a basic message, superposing the additional message onto the basic message of the selected single-hop terminal, and modulating the same in the hierarchical modulation mode.
The link condition mentioned here particularly includes reported channel quality information (CQI), channel state information (CSI), and the testing report regarding the link from the BS. Then, one single-hop terminal can be selected according to the CQI quality and/or CSI quality of the terminal and/or the testing report from the BS. The general principle for the selection is to select the single-hop terminal with good link condition.
Hereinafter the selecting process will be explained by combining the CQI quality and the modulation mode as an example .
Select one single-hop terminal with a better quality. Since the better quality of the selected single-hop terminal can cause the relative low interference thereof, the RS can receive the additional message of this modulation mode and correctly demodulate it, and the terminal can receive the basic message and correctly demodulate it, without being subjected to the effects from the additional message superposed thereon.
Meanwhile, the effects of the modulation should be considered.
Specifically: when the CQIs of the corresponding links of two single-hop terminals are the same, select the terminal according to the code efficiency corresponding to the modulation mode.
For example, where there are two single-hop terminals with the same link condition available for selection, and their modulation modes are QPSK and 16QAM respectively, since the corresponding encoding efficiency of QPSK is lower than that of 16QAM, then select the single-hop terminal whose modulation mode is QPSK. Further, if the modulation modes are 16QAM and 64QAM respectively, since the corresponding encoding efficiency of 16QAM is lower than 64QAM, then select the single-hop terminal whose modulation mode is 16QAM. Therefore, more additional information can be superposed on the single-hop terminal link for the hierarchical modulation, or the effects on the single-hop terminal from superposing the additional message on the single-hop terminal link can be reduced.
When the modulation modes of two single-hop terminals are the same, then select one terminal with the better CQI quality.
Other modes for selecting the single-hop terminals are similar in principle, so further description is not needed here .
Mode IB: selecting the single-hop terminal according to the link condition and the modulation mode, and taking information sent from the base station to the relay station as the additional message, and taking information sent from the base station to the single-hop terminal as the basic message, and superposing the additional message on said basic message, then modulating the same in the hierarchical modulation mode.
In a Wimax system, the communication between the base station and the terminal is achieved by a connection, also, different services or applications can correspond to different connections, and therefore there can be several connections between the base station and the terminal.
In this step, the additional message is superposed onto the basic message of the selected connection, and it is modulated by using a hierarchical modulation mode.
In particular, there can be several modes as follows:
Mode 1C: taking the information sent from the base station to the relay station as the additional message, and taking the information sent from the base station to one single-hop terminal as the basic message, and superposing the additional message and the basic message on different connections of the single-hop terminal, and modulating it by using the hierarchical modulation mode.
Mode ID: taking information sent from the base station to the relay station as the additional message, and taking information sent from the base station to a plurality of single-hop terminals as the basic message, and superposing the additional message and the basic message on different connections of said plurality of single-hop terminals, and modulating it by using the hierarchical modulation mode.
Mode IE: taking information sent from the base station to the relay station as the additional message, and taking information sent from the base station to the single-hop terminal as the basic message, and superposing the additional message and the basic message on the same connection of the single-hop terminal, and modulating it by using the hierarchical modulation mode.
There are other modes similar to the abovementioned ones, which are not described further here.
The method for reducing the effects to the basic message caused by hierarchically modulating the superposed additional message on the single-hop terminal link further comprises: updating the selected single-hop terminal.
In particular, the base station dynamically updates the single-hop terminal according to the collected online information of the terminal.
It can be updated dynamically, namely, every time the base station needs to send the additional message, it can change the single-hop terminal selected, so as to ensure the selected single-hop terminal is always the one having better results in transmitting the additional message after having being superposed and hierarchically modulated. For example, it can be determined according to the number of additional messages transmitted, or changed according to the link quality of the selected single-hop terminal and the modulation mode.
The method for reducing the effects to the basic message caused by hierarchically modulating the superposed additional message further comprises: properly selecting the value of signed distance d.
A corresponding d value is selected according to the relative qualities of the link between the base station and the relay station and the link between the base station and the single-hop terminal. Said additional message and the basic message can be mapped to different layers of a signal constellation diagram respectively by using the selected d value. Furthermore, the single-hop terminal operated by hierarchical modulation can be divided into different groups by properly selected d values, and different groups have different single-hop terminals. The larger the d value for the selected group, the higher are the user channel quality requirements of a corresponding group, and therefore the users with relative better channel quality are selected for the group. The smaller the d value, the lower are the user channel quality requirements of a corresponding group, so selecting the users with relative less good channel quality are selected for the group. Different groups can have different single-hop terminals, and also have different connections.
By properly selecting the parameter d, the interference caused by the additional message can be dispersed or attenuated, the terminal can successfully receive the basic message, and at the same time, the RS can receive and restore the basic message and the additional message. Furthermore, the modulation mode corresponding to the additional message can be selected according to the carrying capacity of the link between the base station and the terminal. When the carrying capacity of the link is high, the modulation mode having correspondingly high code efficiency for encoding the additional message of the link can be selected, otherwise, when the carrying capacity of the link is low, the modulation mode having correspondingly low code efficiency for encoding the additional message of the link can be selected.
By way of the above process, the information sent from the base station to the relay station and information sent from the base station to a single-hop terminal are taken as the additional message and basic message respectively, and the additional message and the basic message are superposed so as to be modulated by using the hierarchical modulation mode. During its implementation, in order to reduce the interference, there also are various modes as mentioned above.
Step 202: the BS sends the hierarchically modulated information to the RS.
The BS superposes the additional message to be transmitted to the RS onto the basic message so as to be hierarchically modulated together and then transmitted, the RS receives the modulated information, and it can demodulate from it the additional message sent to the RS. At the same time, the terminal can also demodulate the basic message sent to the terminal after having received the information. Since the interference caused by superposing the additional message is reduced by using various modes in the above steps, it can ensure that the terminal correctly receives and demodulates the basic message sent to the terminal. Thus, the BS achieves timely transmission of the additional message to the RS.
The additional message can be the information from the network side informing the RS to change the configuration, or for implementing an urgent remedy to a terminal during its switching. For example, sometimes it is necessary for the RS configuration to be changed in a timely manner, such as when the transmitting power needs to be increased or decreased temporarily.
One case of implementing an urgent remedy to a terminal during its switching is that: one user communicates with the base station through the relay station, during the time that the user is switching from this relay station to another relay station, it may happen that a service interruption caused by an abrupt change of the channel quality or a certain process runs into a fault during the switching, at this moment, in order to built a new connection for the user without interrupting the user' s connection, it is required to have extra and urgent signaling interaction between the base station, the relay station and the terminal. In the above case, the method of the present invention can be adopted, and the additional message to be sent to the RS is superposed on the basic message so as to be hierarchically modulated together by using the hierarchical modulation mode and then transmitted to the RS.
The method of the present invention can also be used for the transmission of the relay-sensitive data services. Since the method can flexibly superpose said data service as the additional message to be sent to the RS onto the basic message so as to be hierarchically modulated together and then to be sent to the RS in a timely manner, which reduces the delay on the link from the BS to the RS. Similarly, configuration parameters of a relay station or a terminal can also be adjusted by the method of the present invention.
The present invention can also be used in cases when the system resources are in short supply. When a BS needs to send information to an RS at a moment the system resources are in short supply, and there are no extra system resources available for allocating to the transmission of the information at this time, this purpose can be achieved by using the method of the present invention.
Under normal conditions, the present invention can also be used. Since the link between the base station and the terminal is used when the information sent to the terminal from the base station is taken as the basic message, and the information sent to the RS from the base station is taken as the additional message, and together with the basic message they are hierarchically modulated after having been superposed, the spectrum utilization rate is improved.
Of course, the present invention is not limited to the above circumstances, but can also be used in other circumstances .
As can be seen from the above embodiments, the information sent from the base station to the relay station is taken as the additional message, the information sent from the base station to the single-hop terminal is taken as the basic message, and the additional message and the basic message are superposed together so as to be hierarchically modulated, then the hierarchically modulated information is transmitted to the relay station. By using the present invention, extra system resources are not employed, so the system resources utilization rate is improved, and also sending information without extra system resources allocation is ensured, and timely sending of the relay-sensitive information is ensured, and therefore the reliability and the performance of the system are improved.
While the present invention has been described in connection with the preferred embodiments, it will be apparent to those skilled in the art that modifications and variations can be made without departing from the spirit of the present invention, it is expected that the claims appended will cover these modifications and variations without departing from the spirit of the present invention.

Claims

Claims
1. A method for sending information from a base station to a relay station, characterized by comprising: taking information sent from the base station to the relay station and information sent from the base station to a single-hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using a hierarchical modulation mode; and transmitting the hierarchically modulated information by the base station to the relay station.
2. The method as claimed in claim 1, wherein the step of taking information sent from the base station to the relay station and information sent from the base station to the single-hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using the hierarchical modulation mode comprises: selecting the single-hop terminal according to a link condition and the modulation mode; and taking the information sent from the base station to the relay station as the additional message, taking the information sent from the base station to the single-hop terminal as the basic message, and superposing the additional message on the basic message of the selected single-hop terminal, and then modulating the superposed information by the hierarchical modulation mode.
3. The method as claimed in claim 2, wherein the step of selecting the single-hop terminal according to the condition of the link and the modulation mode comprises: selecting the single-hop terminal according to channel quality information and/or channel status information and/or a testing report of the base station, combined with the modulation mode.
4. The method as claimed in claim 1, wherein the step of taking information sent from the base station to the relay station and information sent from the base station to the single-hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using the hierarchical modulation mode comprises: selecting a connection to the single-hop terminal according to a condition of a link and the modulation mode; and taking the information sent from the base station to the relay station as the additional message, taking the information sent from the base station to the selected connection to the single-hop terminal as the basic message, and superposing the additional message on the basic message of the selected single-hop terminal, and then modulating by the hierarchical modulation mode.
5. The method as claimed in claim 1, wherein the step of taking information sent from the base station to the relay station and information sent from the base station to the single-hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using the hierarchical modulation mode comprises: taking the information sent from the base station to the relay station as the additional message, taking the information sent from the base station to different connections to at least one single-hop terminal as the basic message, and superposing said additional message and basic message onto the corresponding different connections of said at least one single-hop terminal, then modulating by the hierarchical modulation mode.
6. The method as claimed in claim 1, wherein the step of taking information sent from the base station to the relay station and information sent from the base station to the single-hop terminal as the additional message and the basic message respectively, and superposing the additional message and the basic message together for modulating by using the hierarchical modulation mode comprises: taking the information sent from the base station to different relay stations as the additional message, taking the information sent from the base station to the connection of the single-hop terminal as the basic message, and superposing the additional message and the basic message onto the same connection of the single-hop terminal, then modulating by the hierarchical modulation mode .
7. The method as claimed in any one of claims 1, 2, 4, 5 and 6, wherein the step of superposing the additional message and the basic message together and modulating by using the hierarchical modulation mode comprises: selecting corresponding signed distances according to relative qualities of the link between the base station and the relay station and the link between the base station and the single-hop terminal; and mapping the additional message and the basic message to different layers of a signal constellation diagram respectively by using the selected signed distances.
8. The method as claimed in claim 7, wherein said step of mapping the additional message and the basic message to different layers of the signal constellation diagram respectively by using the selected signed distances further comprises: dividing said single-hop terminals into different groups according to the different signed distances selected.
9. The method as claimed in claim 7, wherein said step of mapping the additional message and the basic message to different layers of a signal constellation diagram respectively by using the selected signed distances further comprises: dividing the different connections of the at least one selected signal-hop terminal into different groups according to the different signed distances selected.
10. The method as claimed in any one of claims 1 to 6, wherein a corresponding modulation mode for the additional message is selected according to a carrying capacity of the link from the base station to the terminal.
11. The method as claimed in any one of claims 1 to 6, wherein said method further comprises: dynamically updating said terminal by the base station according to collected terminal online information .
12. The method as claimed in claim 1, wherein after said method it further comprises: receiving and restoring said additional message by the relay station.
13. The method as claimed in any one of claims 1 to 6 or 12, wherein said additional message comprises signaling information and/or delay-sensitive information.
14. The method as claimed in claim 13, wherein said method further comprises: adjusting a transmitting power by the relay station according to said additional message.
15. The method as claimed in claim 13, wherein said method further comprises: adjusting by the relay station configuration parameters of the relay station or the terminal according to said additional message.
16. The method as claimed in claim 13, wherein said method is used for a situation that when the terminal is switched, it needs timely support provided by a relay station to ensure that the communication link of the terminal is not interrupted.
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