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WO2010067524A1 - Système de relais radio, appareil de relais, appareil émetteur, appareil récepteur, procédé de relais de données, procédé d’émission de données et procédé de réception de données - Google Patents

Système de relais radio, appareil de relais, appareil émetteur, appareil récepteur, procédé de relais de données, procédé d’émission de données et procédé de réception de données Download PDF

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Publication number
WO2010067524A1
WO2010067524A1 PCT/JP2009/006423 JP2009006423W WO2010067524A1 WO 2010067524 A1 WO2010067524 A1 WO 2010067524A1 JP 2009006423 W JP2009006423 W JP 2009006423W WO 2010067524 A1 WO2010067524 A1 WO 2010067524A1
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WO
WIPO (PCT)
Prior art keywords
transmission
mode
relay
wireless
transmission path
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2009/006423
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English (en)
Japanese (ja)
Inventor
田中昭生
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NEC Corp
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NEC Corp
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Publication date
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Priority to JP2010541981A priority Critical patent/JP5477298B2/ja
Publication of WO2010067524A1 publication Critical patent/WO2010067524A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a wireless relay system including a relay station that relays data between different wireless networks such as a WPAN (Wireless Personal Area Network) and a WWAN (Wireless Wide Area Network).
  • a WPAN Wireless Personal Area Network
  • WWAN Wireless Wide Area Network
  • Patent Documents 1 to 7 exist as prior documents relating to wireless or wired communication devices.
  • the wired communication device disclosed in Patent Document 1 detects an error in a received packet received from a LAN, and discards the received packet when a serious error such as an error exists in the information header portion. If only a minor error has occurred, the received packet is directly transferred to another LAN without discarding the packet and correcting the error.
  • Patent Document 2 discloses a wireless relay device for digital broadcast signals mounted on an artificial satellite.
  • the radio relay apparatus detects quality degradation based on the received signal level or error rate of the uplink wave
  • the radio relay apparatus modulates the downlink wave using a modulation scheme different from that for the uplink wave.
  • the relay device for optical fiber transmission disclosed in Patent Document 3 relays data having FEC (Forward Error Correction) encoded payload data and overhead data including a BIP (Bit Interleaved Parity) operation result.
  • the relay apparatus performs only the parity check without performing the FEC decoding process on the received data, adds the check result to the overhead data, and transfers it to the next stage apparatus.
  • the communication device for satellite communication disclosed in Patent Document 4 determines satellite channel quality based on the quality of a received signal. Then, the communication apparatus changes the number of continuous transmissions of the transmission data packet and the user data length in the packet according to the determination result of the line quality.
  • Patent Document 5 discloses a relay device used for signal relay between a base station and a mobile station in a mobile radio communication system.
  • the relay apparatus performs signal relay without performing demodulation (symbol demapping) and error correction decoding.
  • the packet relay device disclosed in Patent Document 6 transfers a received packet without performing error correction decoding, and simultaneously executes error correction decoding of the received packet in parallel. Then, when the downstream apparatus cannot decode the packet relay apparatus, the packet relay apparatus re-encodes the decoded packet and transmits it to the downstream apparatus.
  • Patent Document 7 discloses a relay device for digital data broadcasting.
  • the relay device discards the received packet without relaying when the reception level of the received data broadcast carrier signal is reduced or when an error is detected in the error correction decoding process of the received packet.
  • the inventor of the present application has studied a form in which a wireless communication device connectable to two different wireless networks is used as a relay station.
  • a mobile phone terminal having a WWAN communication circuit for connecting to a mobile phone public network and a WPAN communication circuit for connecting to a WPAN.
  • a WPAN terminal for example, a personal computer
  • the mobile phone terminal can transfer transmission data of the WPAN terminal to a base station in the WWAN (that is, a mobile phone public network). That is, the mobile phone terminal operates as a bridge that relays data between WPAN and WWAN.
  • the transmission path encoding method specified by WPAN and the transmission path encoding method specified by WWAN are different. Therefore, a relay station such as a mobile phone terminal receives a radio signal from an end terminal such as a WPAN terminal, performs transmission path decoding corresponding to WPAN, restores received data, and further supports WWAN for the restored data. After the transmission path encoding is performed again, it must be transmitted to the WWAN. Therefore, the relay station has a problem that power consumption required for transmission line decoding and re-encoding of data to be relayed increases.
  • the quality of the wireless transmission path is characterized by large fluctuations compared to the wired transmission path due to the fact that it is easily affected by the mobility of the terminal and interference waves. For this reason, if the transmission path decoding (error correction decoding) at the relay station is always omitted as in the optical fiber transmission relay apparatus disclosed in Patent Document 3, code errors occur frequently and effective communication is performed. May reduce speed.
  • the packet relay apparatus disclosed in Patent Document 6 executes error correction decoding on the received packet in parallel with the received packet transfer process that omits error correction decoding. That is, it is considered that the error correction decoding for the received packet is always performed and thus does not contribute to the reduction of power consumption.
  • the present invention has been made based on the above-described knowledge, and aims to reduce power consumption accompanying transmission path decoding and re-encoding in a wireless relay station such as the above-described mobile phone terminal.
  • the wireless relay system includes a transmission device and a relay device.
  • the transmission device generates a first radio frequency signal including transmission data and transmits the first radio frequency signal to a first radio transmission path.
  • the relay apparatus receives the first radio frequency signal via the first radio transmission path, generates a second radio frequency signal including the transmission data, and generates a second radio transmission path. Relay transmission to.
  • the transmission device can be switched between the first transmission mode and the second transmission mode.
  • the first transmission mode is a mode in which transmission path encoding according to a first encoding rule is performed on the transmission data and then transmitted to the first wireless transmission path.
  • the second transmission mode the first wireless transmission path is obtained after performing transmission path encoding on the transmission data according to a second encoding rule different from the first encoding rule. Is the mode to send to.
  • the relay device can be switched between a first relay mode corresponding to the first transmission mode and a second relay mode corresponding to the second transmission mode.
  • the first relay mode performs transmission path decoding corresponding to the first encoding rule on the received data sequence demodulated from the first radio frequency signal, and converts the decoded data sequence to
  • the transmission mode is transmitted to the second wireless transmission path after performing transmission path encoding in accordance with the second encoding rule.
  • the second relay mode omits transmission path decoding corresponding to the first encoding rule and transmission path encoding according to the second encoding rule, and This is a mode for transmitting to the second wireless transmission path.
  • the 1st aspect of this invention can switch between the 1st relay mode which does not abbreviate
  • FIG. 2 is a sequence diagram showing a data relay procedure by the wireless relay system shown in FIG.
  • FIG. 2 is a diagram showing data transmission / reception timing in the wireless relay system shown in FIG.
  • FIG. 1 shows a wireless relay system according to the present embodiment.
  • the wireless relay system includes a short-range wireless station 1 and a relay station 2.
  • the wireless station 1 has a WPAN interface that can be connected to the relay station 2.
  • WPAN is a general term for short-range wireless networks having a communicable distance of about several tens of centimeters to several tens of meters.
  • WPAN includes UWB, Bluetooth (registered trademark), ZigBee, and the like whose standardization is being discussed by the IEEE 802.15 committee.
  • the radio station 1 transmits and receives a radio frequency signal R1 including user data to and from the relay station 2.
  • the relay station 2 has a WPAN interface for connecting to the short-range wireless station 1 and a WWAN interface for connecting to the base station 50.
  • WWAN is a general term for a wide area wireless network constructed by a radio access network between a base station and a mobile station and a core network generally constructed by a wired transmission path.
  • WCDMA Wideband CDMA, CDMA2000, LTE: Long Term Evolution
  • IMT-Advanced 4G mobile phone networks
  • IEEE which are being standardized by 3GPP (Third Generation Partnership Project), IEEE Mobile WiMAX, etc.
  • the relay station 2 relays the user data received from the wireless station 1 via the WPAN to the base station 50 on the radio frequency signal (RF2). Further, the relay station 2 relays the user data received from the base station 50 to the radio station 1 on the radio frequency signal (RF1).
  • the relay station 2 In relay processing of user data, the relay station 2 omits the relay mode in which error correction decoding and re-encoding of user data is performed, and the encoded data restored from the received signal without error correction decoding and re-encoding.
  • the relay mode for relaying can be switched.
  • the relay mode for performing error correction decoding and re-encoding is referred to as “normal mode”, and the relay mode in which these processes are omitted is referred to as “bypass mode”.
  • the short-range wireless station 1 sets the transmission path encoding rule used for the transmission path encoding and decoding of user data to the WPAN compatible rule and the WWAN. You can switch between rules.
  • the communication mode of the wireless station 1 that performs transmission path coding and decoding using a coding rule that conforms to WPAN is referred to as a “normal mode” in association with the designation of the relay station 2 for the relay mode.
  • the communication mode of the wireless station 1 that performs transmission path encoding and decoding using an encoding rule corresponding to WWAN is referred to as a “bypass mode”.
  • FIG. 2 is a block diagram illustrating a configuration example of the short-range wireless station 1.
  • a WPAN transmission line codec 10 performs transmission line encoding for transmission data and transmission line decoding for reception data based on a transmission line encoding rule suitable for WPAN.
  • a typical example of transmission path encoding is an FEC encoding system.
  • Known FEC coding methods include block coding, convolutional coding, a combination of these, and turbo coding as an advanced form of convolutional coding.
  • the selection of the coding method and the coding rate is determined in consideration of various factors such as the characteristics of the wireless transmission path, the required transmission rate, and the delay tolerance.
  • the WWAN transmission line codec 11 performs transmission line encoding for transmission data and transmission line decoding for reception data based on a transmission line encoding rule suitable for WWAN.
  • the main configuration of the codec 11 may be the same as that of the codec 10 described above, except that the transmission channel encoding / decoding rules are different.
  • the WPAN transmission / reception unit (wireless TX / RX) 12 converts the encoded data sequence encoded by the codec 10 or 11 into a transmission symbol sequence, and multiplies the transmission symbol sequence with the carrier frequency to generate a radio frequency signal (RF1). Generate.
  • the generated radio frequency signal is output from the antenna 13.
  • the WPAN transmission / reception unit 12 demodulates the encoded data sequence from the radio frequency signal received by the antenna 13 and supplies the demodulated data sequence to the codec 10 or 11.
  • the mode control unit 14 controls switching between the normal mode and the bypass mode.
  • user data transferred to the WWAN via the relay station 2 is encoded by the WPAN transmission line codec 11.
  • WPAN transmission line codec 11 On the other hand, in the bypass mode, user data is encoded by the WWAN transmission line codec 11. The same applies to user data received from the WWAN via the relay station 2.
  • the codec 10 suitable for WPAN performs encoding / decoding of control data transferred between the radio station 1 and the relay station 2 for WPAN control. Just do it.
  • control data transferred between the radio station 1 and the relay station 2 for controlling the WPAN for example, information specifying the transmission rate of the data portion, information specifying the modulation method, and information specifying the encoding method
  • the feedback information necessary for these controls is included.
  • the encoding / decoding of the PLCP header may be performed continuously by the WPAN transmission line codec 10 even when the bypass mode is used.
  • FIG. 4 shows a configuration example of the transmission line codec 10 described above.
  • the FEC encoder 1000 encodes transmission data using an FEC encoding scheme that conforms to WPAN.
  • the FEC encoder 1000 may perform rate matching (decimation) processing in order to achieve a desired coding rate.
  • the interleaver 1001 performs rearrangement (interleaving) of the bit order of the encoded data sequence generated by the encoder 1000.
  • the interleaver 1001 performs interleaving according to a bit replacement rule conforming to WPAN.
  • the deinterleaver 1004 restores the bit order by performing reverse processing (deinterleaving) of interleaving on the encoded data sequence demodulated from the received RF signal.
  • the error correction decoder 1003 performs error correction on the received data based on the FEC encoding performed on the transmission side, and restores the received data.
  • the transmission path codec 10 may perform only transmission path encoding / decoding and omit interleaving / deinterleaving. Interleaving / deinterleaving is commonly employed in wireless communications to deal with burst errors, but can be omitted.
  • FIG. 5 shows an example of an OFDM (Orthogonal Frequency Division Multiplexing) wireless transmission / reception unit 12.
  • OFDM Orthogonal Frequency Division Multiplexing
  • Examples of WPAN that employs OFDM include UWB and wireless USB (Universal Serial Bus).
  • the multiplexer 1200 multiplexes the user data encoded by the codec 10 or 11 and the control data / control channel encoded by the codec 10.
  • the symbol mapper 1201 converts the encoded data sequence supplied from the multiplexer into a complex symbol sequence.
  • the mapping by the symbol mapper 1201 is performed according to a modulation scheme adopted by WPAN.
  • the IFFT unit 1202 performs batch conversion on N symbols corresponding to a predetermined WPAN FFT size, and generates N OFDM symbols. Also, IFFT section 1202 inserts a guard interval (cyclic prefix) between the generated OFDM symbols. The OFDM symbol after insertion of the guard interval is converted into a continuous signal by the DA converter 1203 and then supplied to the quadrature modulation unit 1204.
  • the quadrature modulation unit 1204 multiplies the carrier frequency signal generated by the local oscillator 1206 and the baseband signal supplied from the DA converter 1203 to generate a radio frequency signal (RF1).
  • the radio frequency signal is amplified by the transmission power amplifier 1205 and then supplied to the antenna 13.
  • the low noise amplifier 1207 In the signal path from the low noise amplifier 1207 to the demultiplexer 1212, a process opposite to the process for the transmission signal described above is performed on the radio frequency signal received by the antenna 13.
  • the low noise amplifier 1207 amplifies the radio frequency signal received by the antenna 13 and supplies the amplified signal to the orthogonal demodulation unit 1208.
  • the orthogonal demodulation unit 1208 down-converts the received radio frequency signal to the baseband band by multiplying the received radio frequency signal with the carrier frequency signal.
  • the down-converted received signal is sampled by the AD converter 1209 and then supplied to the FFT unit 1210.
  • the FFT unit 1210 performs OFDM demodulation by executing an FFT operation on the received signal after sampling, and generates a symbol string.
  • the symbol demapper 1211 performs a determination process on the received symbol sequence generated by the FFT unit 1210 and demodulates the received data sequence.
  • the demultiplexer 1212 separates user data and control data.
  • the configuration of the WPAN transmission / reception unit 12 shown in FIG. 5 is merely an example.
  • the conversion between the baseband signal and the radio frequency signal may be performed via an intermediate frequency.
  • the WPAN transmission / reception unit 12 is not limited to the OFDM system.
  • the basic configuration of the WPAN transmission / reception unit 12 relating to modulation / demodulation may be the WCDMA wireless transceiver shown in FIG.
  • FIG. 3 is a block diagram illustrating a configuration example of the relay station 2.
  • the WPAN transmission / reception unit 21 performs wireless communication with the WPAN transmission / reception unit 12 of the wireless station 1 via the antenna 20.
  • the WPAN transmission / reception unit 21 converts the encoded data sequence encoded by the codec 22 corresponding to the WPAN into a transmission symbol sequence, and multiplies the transmission symbol sequence with the carrier frequency to generate a radio frequency signal (RF1). Generate.
  • the WPAN transmission / reception unit 21 demodulates the encoded data sequence from the radio frequency signal received by the antenna 20 and supplies the demodulated data sequence to the codec 22.
  • the operation in bypass mode is as follows.
  • the WPAN transmission / reception unit 21 receives the encoded user data demodulated by the WWAN transmission / reception unit 24 described later, and performs modulation processing.
  • the encoded user data demodulated from the received signal by the WPAN transmission / reception unit 21 is sent to the WWAN transmission / reception unit 24 without passing through the codecs 22 and 23.
  • data transmission / reception between the WPAN transmission / reception unit 21 and the WWAN transmission / reception unit 24 may be performed via a data buffer (not shown) for adjustment of processing timing.
  • the WWAN transmission / reception unit 24 performs wireless communication with the base station 50 via the antenna 25.
  • the WWAN transmission / reception unit 24 transmits / receives encoded user data to / from the codec 23 corresponding to the WWAN.
  • the encoded user data demodulated from the received signal by the WWAN transmission / reception unit 24 is sent to the WPAN transmission / reception unit 21 without passing through the codecs 23 and 22.
  • the control data transferred between the radio station 1 and the relay station 2 for WPAN control is encoded / decoded by the codec 22 adapted to WPAN. Is called.
  • the encoded control data demodulated by the WPAN transmitting / receiving unit 21 is sent to the codec 22 corresponding to WPAN.
  • the encoded control data demodulated by the WWAN transmitting / receiving unit 24 is sent to the codec 23 corresponding to the WWAN.
  • the control data regarding the WWAN includes a PILOT bit, a TFCI bit, an FBI bit, and the like.
  • the TFCI bit is information indicating the number of uplink transport channels and the channel format.
  • the FBI bit is response information related to transmission power control (TPC).
  • the mode control unit 26 controls switching between the normal mode and the bypass mode. A specific example of the communication mode switching determination by the mode control unit 26 will be described later.
  • FIG. 6 shows, as an example, a wireless transmission / reception unit 12 of the DS-SS system, specifically the WCDMA system.
  • the multiplexer 2400 multiplexes the encoded user data and the encoded control data / control channel.
  • the symbol mapper 2401 converts the encoded data sequence supplied from the multiplexer 2400 into a complex symbol sequence. The mapping by the symbol mapper 2401 is performed according to the primary modulation scheme of WCDMA.
  • the spreading unit 2402 performs spreading modulation by multiplying the symbol sequence generated by the symbol mapper 2401 by the spreading code.
  • the symbol sequence after the spread modulation is converted into a continuous signal by the DA converter 2403 and then supplied to the quadrature modulation unit 2404.
  • the quadrature modulation unit 2404 multiplies the carrier frequency signal generated by the local oscillator 2406 and the baseband signal supplied from the DA converter 2103 to generate a radio frequency signal (RF2).
  • the radio frequency signal is amplified by the transmission power amplifier 2405 and then supplied to the antenna 25.
  • the radio frequency signal received by the antenna 25 is subjected to a process opposite to the process for the transmission signal described above.
  • the low noise amplifier 2407 amplifies the radio frequency signal received by the antenna 25 and supplies the amplified signal to the quadrature demodulation unit 2408.
  • the orthogonal demodulator 2408 multi-converts the received radio frequency signal with the carrier frequency signal to down-convert it to the baseband band.
  • the down-converted received signal is sampled (that is, code determination) by the AD converter 2409 and then supplied to the despreading unit 2410.
  • the despreading unit 2410 performs a despreading process on the baseband signal sampled by the AD converter 2409 to generate a received symbol sequence.
  • the despreading unit 2410 is configured using, for example, a matched filter.
  • the symbol demapper 2411 performs a determination process on the received symbol sequence generated by the despreading unit 2410 and demodulates the received data sequence.
  • the demultiplexer 2412 separates user data and control data.
  • FIG. 7A and 7B are conceptual diagrams showing signal transfer paths when user data transmitted from the short-range wireless station 1 is transferred to the base station 50 in each of the normal mode and the bypass mode.
  • the relay station 2 executes transmission path decoding corresponding to WPAN and re-encoding corresponding to WWAN.
  • FIG. 7B these channel decoding and re-encoding are omitted.
  • the relay station 2 can omit transmission line decoding and re-encoding for user data to be relayed. For this reason, the power consumption accompanying transmission path decoding and re-encoding can be reduced. Further, the relay station 2 can switch between a normal mode that does not omit transmission path decoding and re-encoding and a bypass mode that is omitted. For example, the relay station 2 may select the normal mode when the transmission path quality in the WPAN section is low. Thereby, it is possible to prevent the effective communication speed from being lowered due to frequent code errors in the WPAN section.
  • the mode control unit 14 acquires the transmission path quality of the WPAN section.
  • the transmission path quality includes RSSI (Received Signal Strength Indicator) obtained by the orthogonal demodulator 1208 or AD converter 1209, LQI (Link Quality Quality Indicator) obtained by the symbol demapper 1211, WPAN transmission channel codec.
  • the code error rate (BER: Bit Error Rate) obtained at 10 may be acquired. Note that the measurement of the transmission path quality may be performed not only on one of the above-described RSSI, LQI, and BER but also on two or more indicators.
  • step S102 the mode control unit 14 (26) determines whether or not the transmission path quality level exceeds a predetermined threshold value. If the quality level exceeds the threshold and is good, the mode control unit 14 (26) determines to change to the bypass mode (S103). On the other hand, when the transmission path quality level does not satisfy the standard (below the threshold), the mode control unit 14 (26) determines to change to the normal mode (S104).
  • the transmission path quality described above generally has a correlation with the communication distance in the WPAN section. For this reason, it can be paraphrased that the determination in step S102 is determining the communication distance (proximity) between the radio station 1 and the relay station 2.
  • the determination process shown in FIG. 8 may be performed on the device side that receives the radio signal propagated through the WPAN transmission path.
  • the mode control unit 26 of the relay station 2 may measure the channel quality and perform the mode change determination.
  • the mode control unit 14 of the radio station 1 may measure the channel quality and perform the mode change determination.
  • the mode change determination may be performed intensively by either the radio station 1 or the relay station 2. For example, if the mode control unit 14 of the wireless station 1 performs intensively, the relay station 2 may transmit the measurement result of the transmission path quality to the wireless station 1. Further, the mode control unit 14 of the radio station 1 may switch the normal mode to the bypass mode together in the downlink direction and the uplink direction when the quality of the downlink transmission path is good.
  • FIG. 9 is a sequence diagram showing the interaction between the short-range radio station 1 and the relay station 2.
  • FIG. 10 is a diagram showing data transmission / reception timing corresponding to FIG. Reference numerals 201TX / RX to 208TX / RX related to data transmission / reception correspond to each other in FIG. 9 and FIG. 9 and 10, “TX” means data transmission, and “RX” means data reception.
  • WPAN beacons 201 and 202 are transmitted and received between the wireless station 1 and the relay station 2 in the normal mode.
  • the wireless station 1 transmits the data 203 encoded according to the WPAN transmission path encoding rule to the relay station 2.
  • the relay station 2 determines whether or not the mode can be changed to the bypass mode based on the data reception result from the radio station 1.
  • the relay station 2 transmits the data 205 encoded according to the WWAN transmission path encoding rule to the base station 50.
  • the relay station 2 transmits a data transmission permission 206 by WWAN encoding to the wireless station 1.
  • the wireless station 1 that has received the data transmission permission 206 by WWAN encoding encodes user data according to the WWAN transmission path encoding rule, and transmits this data 207 to the relay station 2.
  • the relay station 2 transmits the encoded data 207 received from the wireless station 1 to the base station 50 in the bypass mode (data 208).
  • the communication mode can be changed according to the quality level of the WPAN transmission line.
  • the use of the bypass mode can be limited to a case where the quality of the WPAN transmission line is good.
  • the case where the WPAN transmission path quality is good is, for example, a case where the radio station 1 and the relay station 2 are arranged sufficiently close to each other. Thereby, the radio station 1 and the relay station 2 can prevent the effective communication speed from being lowered due to the occurrence of an error in the WPAN section.
  • the mode change determination process by the mode control units 14 and 26 described above may be realized using a semiconductor processing apparatus such as an ASIC or a DSP.
  • the mode change determination process may be realized as an ASIC or DSP common to the wireless transmission / reception units 12, 21, or 24 and the codecs 10, 11, 22, or 23.
  • the mode change determination process may be realized by causing a computer such as a microprocessor to execute a control program describing the determination procedure described with reference to FIG.
  • This control program can be stored in various types of storage media, and can be transmitted via a communication medium.
  • the storage medium includes, for example, a flexible disk, a hard disk, a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD, a ROM cartridge, a RAM memory cartridge with battery backup, a flash memory cartridge, a nonvolatile RAM cartridge, and the like.
  • the communication medium includes a wired communication medium such as a telephone line, a wireless communication medium such as a microwave line, and the Internet.
  • the relay station 2 performs data relay between the WPAN and the WWAN.
  • the combination of networks in which the relay station 2 relays data is not particularly limited.
  • the relay station 2 may perform data relay between WPAN and WLAN.
  • the relay station 2 may perform data relay between the WLAN and the WWAN.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)

Abstract

La présente invention vise à réduire la puissance consommée associée au décodage et au recodage d’itinéraires d’émission dans une station de relais radio. Un système de relais radio selon l’invention comporte une station radio (1) et une station (2) de relais. La station radio (1) génère et émet un signal RF (RF1) comprenant des données de transport vers un itinéraire d’émission WPAN. La station (2) de relais reçoit le signal RF (RF1) via l’itinéraire d’émission WPAN et génère et relaie un signal RF (RF2) comprenant les données reçues en provenance de la station radio (1) vers un itinéraire d’émission WWAN. La station radio (1) peut présenter, pour les données de transport à émettre vers l’itinéraire d’émission WPAN, un mode quelconque parmi deux modes d’émission au choix : l’un servant à effectuer un codage d’itinéraire d’émission compatible WPAN et l’autre servant à effectuer un codage d’itinéraire d’émission compatible WWAN. Par ailleurs, la station (2) de relais peut présenter, pour les données codées reçues en provenance de la station radio (1), un mode de relais quelconque parmi deux modes de relais au choix : l’un servant à effectuer un décodage et un recodage à l’aide d’un code de correction d’erreur et l’autre servant à omettre ces traitements.
PCT/JP2009/006423 2008-12-11 2009-11-27 Système de relais radio, appareil de relais, appareil émetteur, appareil récepteur, procédé de relais de données, procédé d’émission de données et procédé de réception de données Ceased WO2010067524A1 (fr)

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JP2010541981A JP5477298B2 (ja) 2008-12-11 2009-11-27 無線中継システム、中継装置、及びデータ中継方法

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JP2008-315240 2008-12-11
JP2008315240 2008-12-11

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Cited By (3)

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