WO2008035716A1 - Système de communication, sa station de base et procédé de communication - Google Patents
Système de communication, sa station de base et procédé de communication Download PDFInfo
- Publication number
- WO2008035716A1 WO2008035716A1 PCT/JP2007/068207 JP2007068207W WO2008035716A1 WO 2008035716 A1 WO2008035716 A1 WO 2008035716A1 JP 2007068207 W JP2007068207 W JP 2007068207W WO 2008035716 A1 WO2008035716 A1 WO 2008035716A1
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- WIPO (PCT)
- Prior art keywords
- communication
- subchannel
- base station
- terminal
- channel
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
- H04L5/1484—Two-way operation using the same type of signal, i.e. duplex using time-sharing operating bytewise
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
Definitions
- the present invention relates to an OFDMA communication system, its base station, and communication method.
- TDMA / TDD method combining TDM A (Time Division Multiple Access) and TDD (Time Division Duplex) as a wireless access method for digital cellular phone systems and PHS systems Is adopted! / Furthermore, an OFDMA system utilizing OFDMA (Orthogonal Frequency Division Multiplexing Access) has been proposed!
- OFDM is a scheme in which a carrier wave that modulates data is divided into a plurality of subcarriers (subcarriers) that are orthogonal to each other, and a data signal is distributed and transmitted to each subcarrier. .
- FIG. 7 is a block diagram showing a configuration of an OFDM modulation apparatus used on the transmission side.
- Transmission data is input to the OFDM modulator.
- This transmission data is supplied to the serial / parallel conversion section 201 and converted into data composed of a plurality of low-speed transmission symbols. That is, the transmission information is divided to generate a plurality of low-speed digital signals.
- This parallel data is supplied to the inverse fast Fourier transform (IFFT) unit 202.
- IFFT inverse fast Fourier transform
- Parallel data is assigned to each subcarrier constituting the OFDM and mapped in the frequency domain.
- modulation such as BPSK, QPSK, 16QAM, and 64QAM is applied to each subcarrier.
- the mapping data is converted from transmission data in the frequency domain to transmission data in the time domain by performing an IFFT operation.
- a multicarrier modulation signal is generated in which a plurality of subcarriers orthogonal to each other are independently modulated.
- the output of IFFT section 202 is supplied to guard interval adding section 203.
- the guard interval adding unit 203 is a valid symbol of transmission data.
- the rear part is used as a guard interval, and a copy is added to the front part of the effective symbol period for each transmission symbol.
- the baseband signal obtained by the guard interval adding unit is supplied to the orthogonal modulation unit 204.
- Orthogonal modulation section 204 performs quadrature modulation on the baseband OFDM signal supplied from guard interval adding section 203, using the carrier signal supplied from local oscillator 105 of the OFDM modulation apparatus, Frequency conversion to intermediate frequency (IF) signal or radio frequency (RF) signal. That is, the quadrature modulation unit frequency-converts the baseband signal into a desired transmission frequency band and then outputs it to the transmission path.
- IF intermediate frequency
- RF radio frequency
- FIG. 9 is a block diagram showing a configuration of an OFDM demodulator used on the receiving side.
- the OFDM signal generated by the OFDM modulator of FIG. 7 is input to the OF DM demodulator via a predetermined transmission path.
- the OFDM reception signal input to the OFDM demodulator is supplied to the orthogonal demodulator 211.
- the quadrature demodulator 211 performs quadrature demodulation on the OFDM received signal using the carrier signal supplied from the local oscillator 212 of the OFDM demodulator, frequency-converts the RF signal or IF signal to a baseband signal, and performs base conversion. Get the band OFDM signal.
- This OFDM signal is supplied to the guard interval removal unit 213.
- the guard interval removing unit 213 is a guard interval adding unit of the OFDM modulator.
- the signal added in 203 is removed according to the timing signal supplied from the symbol timing synchronization unit (not shown).
- the signal obtained by the guard interval removing unit 213 is supplied to a fast Fourier transform (FFT) unit 214.
- FFT fast Fourier transform
- the FFT unit 214 converts the input reception data in the time domain into reception data in the frequency domain by performing an FFT. Furthermore, demapping is performed in the frequency domain, and parallel data is generated for each subcarrier. Here, demodulation for modulation of BPSK, QPSK, 16QAM, 64QAM, etc. applied to each subcarrier has been performed.
- the parallel data obtained by the FFT unit 214 is supplied to the parallel / serial conversion unit 215 and output as received data.
- OFDM is a scheme that divides a carrier into a plurality of subcarriers.
- OFDMA collects a plurality of subcarriers from the subcarriers in OFDM. This is a method of grouping and assigning one or more groups to each user for multiple communications. Each of the above groups is called a subchannel. In other words, each user communicates using one or more assigned subchannels. Also
- Subchannels are allocated with adaptive increase / decrease depending on the amount of data to be communicated and the propagation environment.
- Patent Document 1 discloses a method of allocating a pilot carrier by adaptively changing the pilot carrier according to the channel environment of each subchannel. This allocation method allocates a small number of pilot carriers when the channel environment is good, and allocates a lot of pilot carriers when the channel environment is bad. This changes the number of subchannels allocated to one user.
- Patent Document 1 Special Table 2005— 520432
- carrier sense for checking whether or not the subchannel can be used in advance is required.
- carrier sense is performed for all subchannels, which requires a lot of processing time. As a result, since it takes time to allocate subchannels, the communication throughput at the user terminal is reduced.
- the communication throughput according to QoS is provided to the user terminal. It becomes impossible to do.
- the present invention has been made to solve the above-described problems, and in an OFDMA communication system communication system, transmission data temporarily decreases while communication of the user terminal is continued. Then, even if it increases again, communication can be continued without reducing the communication throughput of the user's terminal, and throughput according to QoS can be provided to the user's terminal.
- An object is to obtain an OFDMA communication system, its base station, and communication method.
- a communication system is an OFDMA communication system in which data communication is performed using one or a plurality of subchannels between a base station and a plurality of terminals.
- a communication data amount acquisition means for acquiring a communication data amount; and a channel assignment means for assigning the sub-channel according to the communication data amount, and when the communication data amount decreases, the channel assignment means.
- the allocation of at least one subchannel among the allocated subchannels is maintained (claim 1).
- the channel allocating means transmits a predetermined signal using a subchannel in which the allocation is maintained (claim 2).
- the predetermined signal is a signal indicating non-permission (claim 3).
- the channel allocation means determines the number of subchannels to maintain the allocation according to the priority of the terminal (claim 4).
- the priority is a QoS class (claim 5).
- a base station is an OFDMA base station that performs data communication with a plurality of terminals using one or a plurality of subchannels, and a terminal with which communication has been established.
- Communication data amount acquisition means for acquiring a communication data amount between and a channel allocation means for assigning the subchannel to the terminal with which the communication has been established according to the communication data amount, and the communication is established.
- the channel allocation means maintains the allocation of at least one subchannel among the allocated subchannels, and communicates with the terminal with which the communication has been established. Characterized by continuing (Claim 6).
- the channel allocating means transmits a predetermined signal using a subchannel in which the allocation is maintained (claim 7).
- the predetermined signal is a signal indicating non-permission (claim 8).
- the channel allocation means determines the number of subchannels to maintain the allocation according to the priority of the terminal with which the communication has been established (claim 9).
- a channel allocation method is an OFDMA communication method in which data communication is performed between a base station and a plurality of terminals using one or a plurality of subchannels.
- the allocation of at least one subchannel among the channels is maintained (claim 10).
- the present invention when the amount of communication data decreases between a base station and a terminal with which communication has been established, at least one of a plurality of subchannels in which data has become empty is released. Therefore, if the communication of the terminal increases again, the throughput according to the QoS that does not decrease the communication throughput is reduced. Can be provided.
- FIG. 1 is an explanatory diagram showing an OFDMA frame configuration used in a communication method according to an embodiment of the present invention.
- FIG. 2 is a block diagram of a base station in the communication system according to the embodiment of the present invention.
- FIG. 3 is a diagram showing an extra subchannel allocation maintaining flow in the base station of the communication system according to the embodiment of the present invention.
- FIG. 4 is a sequence diagram in the communication system according to the embodiment of the present invention.
- FIG. 5 is a diagram showing the allocation maintenance time of the extra subchannel in the sequence of FIG.
- FIG. 6 is a sequence diagram of a communication method when QoS is not considered.
- FIG. 7 is a block diagram showing a configuration of an OFDM modulation apparatus used on a conventional transmission side.
- FIG. 8 is an explanatory diagram showing a guard interval.
- FIG. 9 is a block diagram showing a configuration of an OFDM modulation apparatus used on a conventional receiving side. Explanation of symbols
- FIG. 1 is an explanatory diagram showing an OFDMA frame configuration used in the communication method according to the embodiment of the present invention.
- This communication system is an OFDMA that communicates between a base station (CS: cell station) and multiple terminals (PS: personal station) using a frame composed of multiple subchannels for each frequency band. It is a communication system of a system.
- the frame configuration in FIG. 1 is, for example, a configuration when four time slots (S1 to S4) are used in the PHS system, the vertical axis is the frequency axis, and the horizontal axis is the time axis. .
- both the downlink period and the uplink period are divided into 28 frequency bands with respect to the frequency axis.
- the first subband of the frequency band is the control It is called a subchannel and is used on the control channel (CCH).
- the first frequency band may be either the highest frequency band or the lowest frequency band.
- the control subchannel indicates which subchannel of each time slot is used in each frequency band.
- Fig. 1 is an example of a PHS system, which is specified by control subchannels C to C.
- control channel is transmitted intermittently every 100 ms.
- the remaining 27 frequency bands are composed of traffic sub-channels T to T for transmitting and receiving data, with 27 in the frequency direction and 4 in the time axis direction, a total of 108
- This traffic subchannel is composed of an anchor subchannel and an extra subchannel.
- the anchor subchannel is used to notify each terminal of which subchannel is used and which terminal is used, and the ability to correctly exchange data by retransmission control between the base station and the terminal. This is a subchannel for use in negotiation.
- An extra subchannel is a subchannel that transmits data to be actually used, and a plurality of extra subchannels can be assigned to one terminal. In this case, the greater the number of allocated sub-subchannels, the wider the band, so high-speed communication becomes possible.
- FIG. 2 is a block diagram of the base station of the communication system according to the embodiment of the present invention.
- the base station 1 is connected to an antenna and converts a signal from a signal processing unit 12 described later into an RF signal, or conversely converts the received RF signal so that the signal processing unit 12 can handle it.
- Wireless communication unit 11 signal processing unit 12 that processes received or transmitted signals, modulation / demodulation unit 13 that modulates or demodulates signals, external I / F unit 14 that is connected to a higher-level communication network, signal processing unit 12 and It comprises a control unit 15 that controls the modem unit 13 and a storage unit 16 that stores QoS information and the like.
- the control unit 15 acquires the communication data amount (communication data amount acquisition means), and determines the communication data amount. In response, subchannels are allocated (channel allocation means). Then, when the amount of communication data decreases, control is performed to maintain the assignment of at least one subchannel among the assigned subchannels.
- the control unit 15 sets an allocation for each terminal of an extra subchannel (ESCH) used for communication, an ESCH (etastra subchannel) setting unit 15-1, and an estra without transmission data. Determines whether or not to start subchannel allocation maintenance and releases Estra subchannel for ESCH (Etastra subchannel) setting unit 15-1; Invalid signal (signal indicating non-permission) generation unit 15-3 ESCH Allocation Maintenance Control Unit 15—2, which instructs to maintain the extra subchannel allocation. 2; Invalid signal (non-permitted) that generates an Invalid signal (a signal indicating non-permission) in the V field of the PHY frame of the extra subchannel. ) A generation unit 15-3 and a QoS class acquisition unit 15-4 that acquires information on the user's QoS class from the storage unit 16!
- the throughput according to the QoS information can be provided to the user.
- QoS Quality of Service
- QoS Quality of Service
- the QoS classes included in the QoS information are classified according to the communication priority, and can be classified into three types, for example, streaming, file transfer, and best-f-auto.
- Streaming is a class that does not allow delay or stop of communication such as real-time delivery of audio and video, videophone, etc.
- class 1 is the highest priority.
- File transfer is a class that can secure a certain amount of bandwidth for electronic files! /, And should be class 2 and has a lower priority than streaming.
- Best F Auto is a class that does not guarantee QoS and class 3 is the lowest priority.
- FIG. 3 is a diagram showing an extra subchannel allocation maintenance flow in the base station of the communication system according to the embodiment of the present invention.
- the QoS class acquisition unit 15-4 of the base station 1 acquires information about the user's QoS class from the storage unit 16 (step S 1).
- the control unit 15 sets a communication band according to the acquired QoS class (step S2). For example, when classified into the above three types of classes (classes 1 to 3), the communication band assigned to class 1 having the highest priority is set to the widest band. For class 2, which has the next highest priority, the communication bandwidth to be assigned is set to a medium bandwidth. The lowest priority! /, And the communication bandwidth assigned to class 3 is set to the narrowest bandwidth.
- the ESCH setting unit 15-1 sets the allocation for each terminal of the extra subchannel (ESCH) used for communication and establishes communication (step S3).
- ESCH harm ij maintenance control unit 15-2 determines whether or not there is transmission data in each of the sub-subchannels used for communication between base station terminals (step S4). In the case of the determined eXtra subchannel (Y in step S4), data transmission is continued as it is (step S5).
- the ESCH assignment maintenance control unit 152 determines whether or not to start assignment of the relevant subchannel (step S6). If it is determined not to start the allocation maintenance, the ESCH setting unit 15-1 is instructed to release the extra subchannel (step S8), and the allocation maintenance flow is terminated.
- step S6 If it is determined to start the allocation maintenance (Y in step S6), the Invalid signal (signal indicating non-permission) generation unit 15-3 is instructed, and the Invalid signal (represents non-permission) in the V field of the PHY frame. By transmitting the signal), it continues to transmit the extra subchannel of empty data (maintains the allocation).
- the control unit 15 determines whether or not a predetermined allocation maintenance time has elapsed (step S7), and when the allocation maintenance time has elapsed (Y in step S7), returns to the process of step S4.
- the number of eXtra subchannels to be released and the number of eXtra subchannels to be allocated are determined. For example, when classified into the above three classes (classes 1 to 3), class 1 does not release any extra subchannels, class 2 does not release half extra subchannels, class 3 has 1 / 4 extra subchannels are released.
- the allocation maintaining time is changed according to the QoS class.
- tl is defined as tl for class 1 allocation maintenance time, t2 for class 2 allocation maintenance time, and t3 for class 3 allocation maintenance time. It is assumed that a predetermined allocation maintenance time of> t2> t3 is allocated.
- the released subchannel is preferably allocated to the extra subchannel without being allocated to the anchor subchannel of another terminal. This is because, if assigned to the anchor subchannel of another terminal, the anchor subchannel is not released until the communication connection is completed even if the transmission data amount of the other terminal is reduced. This is because it may be released.
- the communication method according to the embodiment of the present invention is a case where QoS is considered, and will be described in detail using the sequence of communication procedures between the terminal and the base station shown in FIG.
- Type of subchannel that communicates with terminal (PS) and base station (CS)
- CCH communication channel
- ASCH anchor subchannel
- ESCH etaster subchannel
- the base station even if user data temporarily decreases, the base station continues to send a signal to the terminal for a certain period of time, and the base station does not allocate the extra subchannel (ESCH) to other terminals. Like that. As shown in Fig. 5, by continuing to transmit the downlink (link from the base station to the terminal), the terminal also recognizes that the extra subchannel has been allocated, and does not allocate it to other terminals! /, Like that.
- ESCH extra subchannel
- FIG. 4 shows from communication start (terminal base station connection) to communication end (terminal base station release).
- carrier sense is always executed by both the base station and the terminal. Thereby, it can be used for stable band control.
- a ranging request (bandwidth setting request) is transmitted from the terminal to the base station using the anchor subchannel (ASCH) in the RCH field.
- ASCH anchor subchannel
- Such request for the allocation of the extra subchannel (ESCH) is transmitted via the anchor subchannel (ASCH).
- the ranger response (bandwidth setting) is transmitted from the base station to the terminal using the anchor subchannel (ASCH) in the MAP field.
- a ranging request (bandwidth setting request) is transmitted from the terminal to the base station using the anchor subchannel (ASCH) in the RCH field.
- ASCH anchor subchannel
- ESCH ethastra subchannel
- a ranger response (bandwidth setting) is transmitted from the base station to the terminal using the anchor subchannel (ASCH) in the MAP field.
- ASCH anchor subchannel
- the number of eXtra subchannels to be released and the number of eXtra subchannels to be allocated are determined in accordance with the QoS class.
- the allocation maintenance time is changed according to the QoS class.
- ESCH eXtra subchannel
- TCH communication channel
- CCH control channel
- the call is disconnected and communication is terminated.
- FIG. 6 is an explanatory diagram showing a flow from communication start (terminal base station connection) to communication end (terminal base station release) when communication is performed without considering QoS.
- the link channel (LCH) establishment (confirmation) is transmitted from the terminal to the base station via the control channel (CCH).
- a ranging request (bandwidth setting request) is transmitted from the terminal to the base station using the anchor subchannel (ASCH) in the RCH field.
- ASCH anchor subchannel
- the ranger response (bandwidth setting) is transmitted from the base station to the terminal using the anchor subchannel (ASCH) in the MAP field.
- a ranging request (bandwidth setting request) is transmitted from the terminal to the base station using the anchor subchannel (ASCH) in the RCH field.
- ASCH anchor subchannel
- the ranger response (bandwidth setting) is transmitted from the base station to the terminal using the anchor subchannel (ASCH) in the MAP field.
- the base station notifies the terminal that the ETAS subchannel (ESCH) has been released via the anchor subchannel (ASCH) MAP. At this time, the terminal does not continue downlink transmission (from the base station to the terminal) on the opened eXtra subchannel (ESCH).
- a ranging request (bandwidth setting request) is transmitted from the terminal to the base station using the anchor subchannel (ASCH) in the RCH field.
- ASCH anchor subchannel
- ESCH extended sub-channel
- an unused sub-channel is allocated as an extra sub-channel in the base station.
- the extra subchannel is executed.
- the ranger response (bandwidth setting) is transmitted from the base station to the terminal using the anchor subchannel (ASCH) in the MAP field.
- TCH communication channel
- CCH control channel
- the call is disconnected and communication is terminated.
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Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT07807576T ATE533250T1 (de) | 2006-09-20 | 2007-09-19 | Kommunikationssystem, basisstation dafür und kommunikationsverfahren |
US12/442,088 US20100034154A1 (en) | 2006-09-20 | 2007-09-19 | Communication System, Base Station, and Communication Method |
EP07807576A EP2068472B1 (en) | 2006-09-20 | 2007-09-19 | Communication system, its base station, and communication method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006-254386 | 2006-09-20 | ||
JP2006254386A JP4403515B2 (ja) | 2006-09-20 | 2006-09-20 | 通信システム、その基地局及び通信方法 |
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WO2008035716A1 true WO2008035716A1 (fr) | 2008-03-27 |
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PCT/JP2007/068207 WO2008035716A1 (fr) | 2006-09-20 | 2007-09-19 | Système de communication, sa station de base et procédé de communication |
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US (1) | US20100034154A1 (ja) |
EP (1) | EP2068472B1 (ja) |
JP (1) | JP4403515B2 (ja) |
KR (1) | KR101153096B1 (ja) |
CN (2) | CN101518140B (ja) |
AT (1) | ATE533250T1 (ja) |
WO (1) | WO2008035716A1 (ja) |
Families Citing this family (3)
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FR2940568A1 (fr) * | 2008-12-22 | 2010-06-25 | Thomson Licensing | Procede de transmission dans un reseau sans-fil et procede de gestion de communication correspondant |
PL3691169T3 (pl) | 2014-01-28 | 2022-07-25 | Huawei Technologies Co., Ltd. | Sposób wskazywania transmisji danych, punkt dostępowy i terminal |
US11445401B2 (en) | 2019-02-22 | 2022-09-13 | Mediatek Inc. | Session management in wireless communication system |
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2007
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- 2007-09-19 WO PCT/JP2007/068207 patent/WO2008035716A1/ja active Application Filing
- 2007-09-19 KR KR1020097005739A patent/KR101153096B1/ko not_active IP Right Cessation
- 2007-09-19 CN CN2007800350592A patent/CN101518140B/zh not_active Expired - Fee Related
- 2007-09-19 CN CNA2007800349699A patent/CN101518138A/zh active Pending
- 2007-09-19 AT AT07807576T patent/ATE533250T1/de active
- 2007-09-19 EP EP07807576A patent/EP2068472B1/en not_active Not-in-force
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Also Published As
Publication number | Publication date |
---|---|
US20100034154A1 (en) | 2010-02-11 |
ATE533250T1 (de) | 2011-11-15 |
KR101153096B1 (ko) | 2012-06-04 |
CN101518140B (zh) | 2013-08-07 |
JP4403515B2 (ja) | 2010-01-27 |
CN101518138A (zh) | 2009-08-26 |
EP2068472B1 (en) | 2011-11-09 |
CN101518140A (zh) | 2009-08-26 |
JP2008078890A (ja) | 2008-04-03 |
EP2068472A1 (en) | 2009-06-10 |
KR20090057396A (ko) | 2009-06-05 |
EP2068472A4 (en) | 2010-08-04 |
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