(19) 1^1 Canadian
`Intellectual Property
`Office
`
`Office de la Proprit
`Intellectuelle
`du Canada
`
`(11) CA2 581 166 (13) A1
`(40) 13.04.2006
`(43) 13.04.2006
`
`An Agency of
`Industry Canada
`
`Un organisme
`d'Industrie Canada
`
`(12)
`
`(21) 2 581 166
`
`(22) 09.10.2004
`
`ZTE CORPORATION,
`Keji Road South
`Hi-Tech Industrial Park
`ZTE Plaza, Nanshan District
`Guangdong Province P.R.
`518057, SHENZHEN, XX (CN).
`
`(71)
`
`(72)
`
`(51) Int. CI.:
`H04J 11/00 (200601)
`
`(85) 21.03.2007
`
`(86) PCT/CN04/001144
`
`(87) WO06/037257
`GAO, XIANG (CN).
`WANG, NING (CN).
`LIU, HEXING (CN).
`WU, YANWEI (CN).
`LIU, YING (CN).
`
`(74)
`
`MARKS & CLERK
`
`(54) PROCEDE PERMETTANT D'AFFECTER UNE LARGEUR DE BANDE DE SPECTRE DE FREQUENCES D'UN
`SYSTEME DE COEXISTENCE OFDM ET OFDMA
`(54) A METHOD FOR ASSIGNING FREQUENCY SPECTRUM BANDWIDTH OF A OFDM AND OFDMA
`COEXISTENCE SYSTEM
`
`Intel Corporation Ex. 1014
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`Page 1 of 44
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`

`

`M Office de la Propriété
`
`Intellectuelle
`du Canada
`Un organisme
`d'Industrie Canada
`
`Canadian
`Intellectual Property
`Office
`An agency of
`Industry Canada
`
`CA 2581166 A1 2006/04/13
`(21) 2 581 166
`(12) DEMANDE DE BREVET CANADIEN
`CANADIAN PATENT APPLICATION
`(13) A1
`
`(86) Date de dépôt PCT/PCT Filing Date: 2004/10/09
`(87) Date publication PCT/PCT Publication Date: 2006/04/13
`(85) Entrée phase nationale/National Entry: 2007/03/21
`(86) ISP demande PCT/PCT Application No.: CN 2004/001144
`(87) ISP publication PCT/PCT Publication No.: 2006/037257
`
`(51) Cl.lnt./lnt.CI. H04J 11/00(2006.01)
`(71) Demandeur/Applicant:
`ZTE CORPORATION, CN
`(72) Inventeurs/lnventors:
`WANG NING CN'
`LIU, HEXING, CN;
`GAO, XIANG, CN;
`LIU, YING, CN;
`WU, YANWEI, CN
`(74) Agent: MARKS & CLERK
`
`(54) Titre : PROCEDE PERMETTANT D'AFFECTER UNE LARGEUR DE BANDE DE SPECTRE DE FREQUENCES
`D'UN SYSTEME DE COEXISTENCE OFDM ET OFDMA
`(54) Title: A METHOD FOR ASSIGNING FREQUENCY SPECTRUM BANDWIDTH OF A OFDM AND OFDMA
`COEXISTENCE SYSTEM
`
`Frame n-l
`
`frame n
`
`frame n+1
`
`downlink OFDMA sub-frame
`
`uplink OFDMA sub-frame
`
`downlink OFDM sub-frame 1
`0 frequency band ID
`
`uplink OFDM sub-frame 1
`0 frequency band ID
`
`downlink OFDMA
`sub-frame
`
`downlink OFDM sub-frame 2
`0 frequency band 20
`
`uplink OFDMA
`Sub-frame
`
`uplink OFDM sub-frame 2
`D frequency band 20
`
`downlink OFDM sub-frame 3
`0 frequency band 30
`
`uplink OFDM sub-frame 3
`0 frequency band 31)
`
`(57) Abrégé/Abstract:
`A method for assigning frequency spectrum bandwidth of a OFDM and OFDM coexistence system,the BS system combines the
`upward and downward data containing OFDM sub-frame and OFDMA sub-frame in TD fashion, and assigns frequency spectrum
`reasonably according to the different bandwidth require of OFDM and OFDMA and the use condition of the frequency band ,
`constitutes the frame structure realizing OFDM and OFDMA coexistence to transmit upward/downward data of OFDM and
`OFDMA . The method for assigning frequency spectrum bandwidth of the present invention can achieve higher frequency
`spectrum utilization efficiency of OFDM and OFDMA coexistence system , and can avoid the waste of frequency spectrum
`resource of operator, it also can realize flexible networking .
`
`Canada http://opic.gc.ca • Ottawa-Hull K1A 0C9 • http://cipo.gc.ca
`
`OPIC-CIPO 191
`
`O PI C
`
`CIPO
`
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`CA 02581166 2007-03-21
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`Abstract
`
`The present invention relates to a method for assigning
`
`frequency spectrum bandwidth of an OFDM and OFDMA
`
`coexistence system, and the base station system combines
`
`uplink and downlink data containing OFDM sub-frames and
`
`OFDMA sub-frames in a time division fashion, assigns the
`
`frequency spectrum reasonably according to the different
`
`bandwidth requirements of the OFDM and the OFDMA and
`
`the use condition of the frequency band, and constitutes a
`
`frame structure realizing the coexistence of the OFDM and
`
`the OFDMA, so as to send the OFDMA uplink/downlink data
`
`and the OFDM uplink/downlink data. The method for
`
`assigning frequency spectrum bandwidth according to the
`
`present invention can achieve a higher frequency spectrum
`
`utilization efficiency of an OFDM and OFDMA coexistence
`
`system, avoid the waste of the frequency spectrum
`
`resource of a service provider; and can also realize more
`
`flexible networking.
`
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`Method for Assigning Frequency Spectrum
`
`Bandwidth of an OFDM and OFDMA Coexistence
`
`System
`
`Field of the Invention
`
`The present invention relates to a method for assigning
`
`frequency spectrum bandwidth of a communication system,
`
`and especially relates to a method for assigning frequency
`
`spectrum bandwidth of an OFDM (Orthogonal Frequency
`
`Division Multiplexing) and OFDMA (Orthogonal Frequency
`
`Division Multiplexing Access) coexistence system.
`
`Background Art
`
`Orthogonal frequency division multiplexing (OFDM)
`
`technology was firstly used in military field in 1960s, the
`
`modulating mode has very high frequency spectrum
`
`utilization efficiency and is suitable for wireless data
`
`transmission, so it has been used widely as a wireless
`
`access method.
`
`OFDM system adopts multi-carrier technique, and a high
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`CA 02581166 2007-03-21
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`speed data stream is transmitted by serial to parallel
`
`convert, so that the duration of data symbols in each
`
`sub-carrier increases relatively, and then the ISI
`
`(InterSymbol Interference) brought by the time dispersion
`
`of wireless channel could be reduced efficiently, thereby
`
`reducing the complexity of balance in a receiver, and even
`
`avoiding using an equalizer and only using the method of
`
`inserting cyclic prefix to eliminate the unfavorable influence
`
`of ISI. Orthogonality exists among the sub-carriers of the
`
`OFDM system, which permits mutual overlap of the
`
`frequency spectrum of each sub-carrier, and therefore,
`
`compared with the conventional frequency division
`
`multiplexing system, the OFDM system could maximize the
`
`use of frequency spectrum resources. Figure 1 is a time
`
`domain wave shape view of an OFDM symbol in which the
`
`prefix is inserted cyclically.
`
`In figure 1, Tb represents the effective symbol cycle in
`
`OFDM signals, Tg represents the inserted cyclic prefix, and
`
`the contents of Tg is the copy of the last part of contents in
`
`Tb period, and Ts is the cycle of the whole OFDM symbols.
`
`As long as the length of the cyclic prefix is longer than the
`
`maximum time delay extension of OFDM symbols, the
`
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`orthogonality of each sub-carrier in one OFDM symbol can
`
`be guaranteed. And therefore, the multi-path interference
`
`could be overcome through inserting the cyclic prefix Tg
`
`periodically. It is usually required that the cyclic prefix
`
`should be bigger than or equal to 2 to 4 times of the
`
`maximum time delay extension when design an OFDM
`
`system, and table 1 shows the maximum time delay
`
`extension in common environments.
`
`environment
`
`maximum time delay
`
`Indoor
`
`outdoor
`
`extension
`
`40ns~200ns
`
`lps~20ps
`
`Table 1
`
`It can be seen from table 1 that if the OFDM system only
`
`needs to support the wireless communication in indoor
`
`environment, usually the cyclic prefix should be bigger than
`
`800ns, whereas if the outdoor wireless communication
`
`needs to be supported, the cyclic prefix should be bigger
`
`than 20ps, and because of the limitation of the time delay
`
`extension, in the condition that the FFT dots are fixed, the
`
`OFDM system should not adopt a too wide bandwidth.
`
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`In a broad sense, the OFDM system comprises OFDM and
`
`OFDMA systems, and OFDMA has the similar basic principle
`
`to that of the OFDM, while the difference of the two lies in
`
`that the bandwidth assignment of the OFDMA system is
`
`carried out in the two-dimensional interval of time and
`
`frequency, and the bandwidth of the OFDM system is only
`
`assigned on time dimension. Compared with the
`
`conventional OFDM system, the bandwidth assignment of
`
`the OFDMA system is more flexible and suitable for use in
`
`cellular networking, so it is attracting people's attention
`
`more and more.
`
`The IEEE802.16 standard adopts OFDM and OFDMA
`
`techniques, but the two kinds of techniques are
`
`independent of each other relatively in the standard, and
`
`there is not any special definite provision on cooperative
`
`work of the two systems. From the point of compatibility,
`
`research on the coexistence system of OFDM and OFDMA is
`
`needed so that the future system could support OFDM and
`
`OFDMA techniques at the same time, and it could furthest
`
`protect the interests of investors and users.
`
`Furthermore, to implement the coexistence of OFDM and
`
`OFDMA, it is needed to consider not only the compatibility of
`
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`the frame structure to different systems, but also the
`
`limitation of cyclic prefix on the bandwidth of OFDM system
`
`and OFDMA system.
`
`The calculating formula of the cyclic prefix in OFDM
`
`symbols is as follows:
`G-Nr
`' FFT
`n-BW
`wherein n is an over-sampling factor, and as for the
`
`T=GT
`
`OFDM system, the value of n relates to the bandwidth, and
`
`its range is basically between 1.14 to 1.15, but to an OFDMA
`
`system, the value of n generally is 8/7. And G is the cyclic
`
`prefix factor, which has 4 values as follows: 1/4, 1/8, 1/16,
`
`and 1/32. NFFT is the number of FFT dots.
`
`From the formula, it can be seen that the length of the
`
`cyclic prefix is in direct proportion to G, is in inverse
`
`proportion to the bandwidth, and is in direct proportion to
`
`the number of the FFT dots. Generally speaking, the
`
`number of the FFT dots adopted by the OFDM system is
`
`smaller than that of the OFDMA system, and the OFDM
`
`system generally adopts the FFT of 256 dots, while the
`
`OFDMA system adopts the FFT of 2048 dots. To the OFDM
`
`system of 256 dots, because of the limitation of the cyclic
`
`prefix, the bandwidth can not be too wide, but to the OFDMA
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`system of 2048 dots, in the condition of the same time delay
`
`extension, as the number of the FFT dots is 8 times as that
`
`of the OFDM system, the largest bandwidth that the OFDMA
`
`system could adopt also is 8 times as that of the OFDM
`
`system. When the OFDMA system carries out cellular
`
`networking, the bandwidth should not be too small in order
`
`to guarantee the capacity of the system. Table 2 shows
`
`the range of the cyclic prefixes of OFDM of 256 dots and
`
`OFDMA of 2048 dots in every usable bandwidth condition as
`
`follows:
`
`FN'dots
`
`bandwidth
`
`Minimum
`
`Maximum
`
`cyclic prefix
`
`cyclic prefix
`
`256
`
`256
`
`256
`
`256
`
`256
`
`256
`
`2048
`
`2048
`
`2048
`
`2048
`
`10MHz
`
`7 MHz
`
`3.5 MHz
`
`1.75 MHz
`
`700ns
`
`1 ps
`
`2 ps
`
`4 ps
`
`5.6 ps
`
`8.02 ps
`
`16.04 ps
`
`32.08 ps
`
`5.5 MHz
`
`1.45 ps
`
`11.64 ps
`
`3 MHz
`
`20 MHz
`
`10 MHz
`
`28 MHz
`
`14 MHz
`
`2.67 ps
`
`1.4 ps
`
`2.8 ps
`
`2 ps
`
`4 ps
`
`21.3 ps
`
`11.2 ps
`
`22.4 ps
`
`16.04 ps
`
`32.08 ps
`
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`2048
`
`2048
`
`2048
`
`2048
`
`2048
`
`7 MHz
`
`3.5 MHz
`
`8 |JS
`
`16 MS
`
`17.5 MHz
`
`3.2 ps
`
`8.75 MHz
`
`6.4 |JS
`
`64.16 |JS
`
`128.32 [is
`
`25.66 |js
`
`51.32 ps
`
`1.25 MHz
`
`35.6 |JS
`
`284.44 ps
`
`Table 2
`
`From table 2, it can be seen that if it is desired to ensure
`
`the bandwidths of the OFDM system and the OFDMA system
`
`are the same, because of the impact of the maximum time
`
`delay extension, the bandwidth should not be too high, and
`
`if the capacity of OFDMA system is taken into consideration,
`
`the bandwidth that the OFDMA system adopts should not be
`
`too low, either. Owing to the above two reasons, the
`
`bandwidth which the OFDMA system adopts may be
`
`different from that of the OFDMA system. When the
`
`bandwidths of the two systems are remarkably different
`
`from each other, to the OFDM and OFDMA time division
`
`combined frame fashion in the conventional time division
`
`fashion, the utilization rate of frequency spectrum will be
`
`very low.
`
`Therefore, in order to improve the utilization efficiency of
`
`the frequency spectrum of the OFDM and OFDMA
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`coexistence system, it is necessary to design an efficient
`
`method for assigning the frequency spectrum bandwidth of
`
`the system.
`
`Summary of the Invention
`
`The main purpose of the present invention is to provide a
`
`method for assigning frequency spectrum bandwidth of an
`
`OFDM and OFDMA coexistence system, and constituting a
`
`frame structure which could meet the requirements of the
`
`said coexistence system, and assigning the frequency
`
`spectrum reasonably, the utilization efficiency of the
`
`frequency spectrum of the system can be improved.
`
`In order to achieve the above invention object, the
`
`present invention provides a method for assigning the
`
`frequency spectrum bandwidth of an OFDM and OFDMA
`
`coexistence system, and the coexistence system comprises
`
`a base station system, characterized in that the base station
`
`system combines the uplink data and the downlink data
`
`containing OFDM sub-frames and OFDMA sub-frames in
`
`time division fashion, assigns the frequency spectrum
`
`reasonably according to the different bandwidth
`
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`requirements of OFDM and OFDMA and the use condition of
`
`the frequency band, and constitutes the frame structure
`
`realizing the coexistence of OFDM and OFDMA.
`
`The above method for assigning frequency spectrum
`
`bandwidth of an OFDM and OFDMA coexistence system,
`
`characterized in that when the OFDM and OFDMA adopt the
`
`same frequency band, and bandwidths are the same or of
`
`little difference, the method for assigning the frequency
`
`spectrum bandwidth of the system can comprise the
`
`following steps:
`
`the base station system divides each data frame on the
`
`whole frequency band into non-continuous downlink
`
`sub-frame and uplink sub-frame on the time axis, which are
`
`respectively for transmitting the downlink data and
`
`receiving the uplink data;
`
`the base station system divides the downlink sub-frame
`
`into an OFDMA downlink sub-frame and an OFDM downlink
`
`sub-frame on the time axis, which are respectively for
`
`transmitting the OFDMA downlink sub-frame data and the
`
`OFDM downlink sub-frame data; and
`
`the base station system divides the uplink sub-frame into
`
`an OFDMA uplink sub-frame and an OFDM uplink sub-frame
`
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`on the time axis, which are respectively for transmitting the
`
`OFDMA uplink sub-frame data and the OFDM uplink
`
`sub-frame data.
`
`The above method for assigning frequency spectrum
`
`bandwidth of an OFDM and OFDMA coexistence system,
`
`characterized in that the dividing of the said downlink data
`
`region and/or the uplink data region can be continuous or
`
`non-continuous.
`
`The above method for assigning frequency spectrum
`
`bandwidth of an OFDM and OFDMA coexistence system,
`
`characterized in that when the OFDM and the OFDMA adopt
`
`the same frequency band, and their bandwidths are the
`
`same or of little difference, the method for assigning the
`
`frequency spectrum bandwidth of the system can comprise
`
`the following steps:
`
`the base station system divides a frame into an OFDMA
`
`sub-frame and an OFDM sub-frame by time, which are
`
`respectively for sending the OFDMA data and the OFDM
`
`data;
`
`the base station system divides the OFDMA sub-frame
`
`into a downlink OFDMA sub-frame and an uplink OFDM
`
`sub-frame; and
`
`10
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`the base station system divides the OFDM sub-frame into
`
`a downlink OFDM sub-frame and an uplink OFDM
`
`sub-frame.
`
`The above method for assigning frequency spectrum
`
`bandwidth of an OFDM and OFDMA coexistence system,
`
`characterized in that when the total frequency bands of the
`
`OFDM and the OFDMA are the same, and the bandwidths of
`
`the OFDM and the OFDMA are different, the method for
`
`assigning the frequency spectrum bandwidth of the system
`
`can comprise the following steps:
`
`the base station system divides each data frame on the
`
`whole frequency band into a downlink sub-frame and an
`
`uplink sub-frame on the time axis;
`
`the base station system divides the downlink sub-frame
`
`into a downlink OFDMA sub-frame and a downlink OFDM
`
`sub-frame by time, which are respectively for sending the
`
`OFDMA downlink data and the OFDM downlink data;
`
`the region for sending the OFDMA downlink data sends
`
`an OFDMA downlink sub-frame according to the
`
`requirements of networking;
`
`the region for sending the OFDM downlink data is divided
`
`into multiple sub-frequency bands by frequency domain,
`
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`and an OFDM downlink sub-frame is sent in each
`
`sub-frequency band and the data in different frequency
`
`bands are sent in different sectors;
`
`the base station system divides the uplink sub-frame into
`
`an uplink OFDMA sub-frame and an uplink OFDM sub-frame
`
`on the time axis, which are respectively for sending the
`
`OFDMA uplink data and the OFDM uplink data;
`
`the region for sending the OFDMA uplink data needs to
`
`send an OFDMA uplink sub-frame by the requirements of
`
`networking; and
`
`the region for sending the OFDM uplink data is divided
`
`into multiple sub-frequency bands by frequency domain,
`
`and an OFDM uplink sub-frame is sent in each
`
`sub-frequency band and the data in different frequency
`
`bands are sent in different sectors.
`
`The above method for assigning the frequency spectrum
`
`bandwidth of an OFDM and OFDMA coexistence system,
`
`characterized in that the frequency bands of the multiple
`
`sub-frequency bands in the region for sending the OFDM
`
`uplink data and in the region for sending the OFDM downlink
`
`data are separated by a protection band, and the frequency
`
`bands of the multiple sub-frequency bands in the region for
`
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`

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`sending the OFDM downlink data are separated by a
`
`protection band.
`
`The above method for assigning the frequency spectrum
`
`bandwidth of an OFDM and OFDMA coexistence system,
`
`characterized in that when the total frequency bands of the
`
`OFDM and the OFDMA are the same, and the bandwidths of
`
`the OFDM and the OFDMA are different, the method for
`
`assigning the frequency spectrum bandwidth of the system
`
`can comprise the following steps:
`
`the base station system divides each data frame on the
`
`whole frequency band into an OFDMA sub-frame and an
`
`OFDM sub-frame on the time axis;
`
`the base station system divides the OFDMA sub-frame
`
`into a downlink OFDMA sub-frame and an uplink OFDMA
`
`sub-frame by time; and
`
`the base station system divides the OFDM sub-frame into
`
`multiple sub-frequency bands by frequency domain, and an
`
`OFDM downlink sub-frame and an uplink sub-frame are
`
`sent in each sub-frequency band and the data in different
`
`frequency bands are sent in different sectors.
`
`The above method for assigning the frequency spectrum
`
`bandwidth of an OFDM and OFDMA coexistence system,
`
`13
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`CA 02581166 2007-03-21
`
`characterized in that the frequency bands of the multiple
`
`sub-frequency bands are separated by a protection band.
`
`The above method for assigning the frequency spectrum
`
`bandwidth of an OFDM and OFDMA coexistence system,
`
`characterized in that when the total frequency bands of the
`
`OFDM and the OFDMA are the same, and the bandwidths of
`
`the OFDM and the OFDMA are different, the method for
`
`assigning the frequency spectrum bandwidth of the system
`
`can comprise the following steps:
`
`the base station system divides each data frame on the
`
`whole frequency band into two parts, one part is a downlink
`
`sub-frame and the other part is an uplink frame;
`
`the base station system divides the downlink sub-frame
`
`into two sub-frequency bands by frequency domain, and
`
`the first sub-frequency band is used for sending the OFDMA
`
`downlink sub-frame, and at the second sub-frequency band,
`
`the OFDMA downlink sub-frame and the OFDM downlink
`
`sub-frame are combined in time division fashion, and the
`
`two parts respectively occupy only part of the time of the
`
`downlink sub-frame; and
`
`the base station system divides the uplink sub-frame into
`
`two sub-frequency bands by frequency domain, and the
`
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`first sub-frequency band is used for sending the OFDMA
`
`uplink sub-frame, and at the second sub-frequency band,
`
`the OFDMA uplink sub-frame and the OFDM uplink
`
`sub-frame are combined in time division fashion, and the
`
`two parts respectively occupy only part of the time of the
`
`uplink sub-frame.
`
`The above method for assigning the frequency spectrum
`
`bandwidth of an OFDM and OFDMA coexistence system,
`
`characterized in that when the total frequency bands of the
`
`OFDM and the OFDMA are the same, and the bandwidths of
`
`the OFDM and the OFDMA are different, the method for
`
`assigning the frequency spectrum bandwidth of the system
`
`can comprise the following steps:
`
`the base station system divides each data frame on the
`
`whole frequency band into a downlink OFDMA sub-frame
`
`and an uplink OFDMA sub-frame on the time axis, which are
`
`respectively for sending the OFDMA downlink data, and part
`
`of them is used for sending the OFDMA uplink data, wherein
`
`the said downlink OFDMA sub-frame also comprises an
`
`OFDMA prefix region;
`
`the base station system divides, in a OFDMA non-prefix
`
`downlink data region by the frequency assigned order, a
`
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`region for transmitting the OFDM downlink sub-frame; and
`
`the base station system divides, in an OFDMA uplink data
`
`region by the frequency assigned order, a region for
`
`transmitting the OFDM uplink sub-frame.
`
`The following is a detailed description of the present
`
`invention in conjunction with the accompanying drawings
`
`and embodiments thereof, which shall not be understood as
`
`a limitation of the present invention.
`
`Brief Description of the Accompanying Drawings
`
`Figure 1 is a time domain waveform view of the OFDM
`
`signal in which the cyclic prefix is added;
`
`Figure 2 is a frame format of the OFDM and OFDMA
`
`coexistence system;
`
`Figure 3 is another frame format of the OFDM and OFDMA
`
`coexistence system;
`
`Figure 4 is the frame format adopted by the first
`
`embodiment of the method for assigning the frequency
`
`spectrum bandwidth of an OFDM and OFDMA coexistence
`
`system according to the present invention;
`
`Figure 5 is the frame format adopted by the second
`
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`embodiment of the method for assigning the frequency
`
`spectrum bandwidth of an OFDM and OFDMA coexistence
`
`system according to the present invention;
`
`Figure 6 is the frame format adopted by the third
`
`embodiment of the method for assigning the frequency
`
`spectrum bandwidth of an OFDM and OFDMA coexistence
`
`system according to the present invention; and
`
`Figure 7 is the frame format adopted by the fourth
`
`embodiment of the method for assigning the frequency
`
`spectrum bandwidth of an OFDM and OFDMA coexistence
`
`system according to the present invention.
`
`Embodiments for Carrying Out the Present Invention
`
`The present invention is further described in detail
`
`hereinafter in conjunction with the accompanying drawings
`
`and the embodiments thereof.
`
`As described above, due to the requirements of the
`
`maximum time delay extension and the capacity of the
`
`OFDMA system, the bandwidths of the OFDM sub-frame and
`
`the OFDMA sub-frame can be the same or different, and
`
`following four methods can be adopted for the frequency
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`spectrum utilization according to different circumstances.
`
`If the frequency bands of the OFDM sub-frame and the
`
`OFDMA sub-frame are the same, and their bandwidths are
`
`the same or of little difference (for example, when the
`
`bandwidth of the OFDMA is less than two times of the
`
`bandwidth of the OFDM), the method for utilizing the
`
`frequency spectrum according to the first embodiment can
`
`be adopted, and the method comprises the following steps:
`
`the base station system divides a data frame of the whole
`
`frequency band into two non-continuous parts on the time
`
`axis, one part is used for transmitting the downlink data and
`
`the other part is used for receiving the uplink data;
`
`the base station system divides the downlink data region
`
`into two parts (which can be continuous or non-continuous,
`
`the definition of being non-continuous is that an interval can
`
`exist between the parts of the OFDMA and the OFDM in the
`
`uplink/downlink data region) on the time axis, one part is
`
`used for transmitting the OFDMA downlink sub-frame and
`
`the other part is used for transmitting the OFDM downlink
`
`sub-frame; and
`
`the base station system divides the uplink data region
`
`into two parts (which can be continuous or non-continuous,
`
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`the definition of being non-continuous is that an interval can
`
`exist between the parts of the OFDMA and the OFDM in the
`
`uplink/downlink data region) on the time axis, one part is
`
`used for transmitting the OFDMA uplink sub-frame and the
`
`other part is used for transmitting the OFDM uplink
`
`sub-frame.
`
`Figure 2 and figure 3 present the frame structure
`
`definition which might be adopted by the OFDM and the
`
`OFDMA coexistence system according to the present
`
`embodiment.
`
`In figure 2, a frame is first divided into a downlink
`
`sub-frame and an uplink sub-frame, and the
`
`uplink/downlink sub-frame is respectively combined by the
`
`OFDMA sub-frame and the OFDM sub-frame in time division
`
`fashion. The downlink sub-frame comprises an OFDMA
`
`downlink sub-frame and an OFDM downlink sub-frame, and
`
`the uplink sub-frame comprises an OFDMA uplink
`
`sub-frame and an OFDM uplink sub-frame.
`
`The method for utilizing the frequency spectrum
`
`according to the present embodiment can also be that the
`
`base station system first divides a frame into two parts by
`
`time, and one part is used for sending the OFDMA data, and
`
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`the other part is used for sending the OFDM data. The
`
`OFDMA data region is divided into a downlink OFDMA
`
`sub-frame and an uplink OFDMA sub-frame, and the OFDM
`
`data region is divided into a downlink OFDM sub-frame and
`
`an uplink OFDM sub-frame. For example, in figure 3, an
`
`OFDM sub-frame and an OFDMA sub-frame are combined in
`
`one frame in time division fashion, a frame comprises an
`
`OFDM sub-frame and an OFDMA sub-frame, and an OFDM
`
`sub-frame comprises a downlink OFDM sub-frame and an
`
`uplink OFDM sub-frame, and an OFDMA sub-frame
`
`comprises a downlink OFDMA sub-frame and an uplink
`
`OFDMA sub-frame.
`
`In this method, the OFDM sub-frame and the OFDMA
`
`sub-frame are combined directly in time division fashion,
`
`and their combination can be completed in one frame or in
`
`an uplink/downlink sub-frame. Figures 2 and 3 shows the
`
`circumstance that the frequency bands of the OFDM and the
`
`OFDMA are the same and the bandwidths of the OFDM and
`
`the OFDMA are the same, and as for thé circumstance that
`
`their frequency bands are the same and their bandwidths
`
`are of little difference, the method as shown in figure 4 can
`
`be adopted. In figure 4, a frame firstly is divided into a
`
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`downlink sub-frame and an uplink sub-frame, and the
`
`downlink sub-frame comprises an OFDMA downlink
`
`sub-frame and an OFDM downlink sub-frame, and the
`
`uplink sub-frame comprises an OFDMA uplink sub-frame
`
`and an OFDM uplink sub-frame. If the OFDMA system
`
`adopts a sector antenna, and the OFDM and the OFDMA
`
`systems adopt the same radio frequency system, the OFDM
`
`sub-frame can send the same contents in every sector. In
`
`figure 4, the lengths of the downmost panes of the OFDM
`
`and the OFDMA are different, which aims to show that the
`
`frequency band of the OFDMA generally is wider than that of
`
`the OFDM. In addition, in figures 4 to 7, the horizontal axis
`
`is the time axis, and the vertical axis is the frequency axis.
`
`When the bandwidths of the OFDM sub-frame and the
`
`OFDMA sub-frame are different, for example, when the
`
`bandwidth of the OFDMA sub-frame is multiple to that of the
`
`OFDM sub-frame, the method for utilizing the frequency
`
`spectrum according to the second, third and fourth
`
`embodiments can be adopted.
`
`The second method for utilizing the frequency spectrum
`
`comprises the following steps:
`
`the base station system divides each data frame on the
`
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`whole frequency band into two parts on the time axis, and
`
`one part is the downlink data and the other part is the uplink
`
`data;
`
`the base station system divides the downlink sub-frame
`
`into two parts (which can be continuous or non-continuous)
`
`by time, and one part is used for sending the OFDMA
`
`downlink data, and the other part is used for sending the
`
`OFDM downlink data;
`
`the region for sending the OFDMA downlink data send an
`
`OFDMA downlink sub-frame according to the requirements
`
`of networking;
`
`the region for sending the OFDM downlink data is divided
`
`into multiple sub-frequency bands by frequency domain,
`
`and an OFDM downlink sub-frame is sent in each
`
`sub-frequency band and the data in different frequency
`
`bands are sent in different sectors, and the frequency bands
`
`can be separated by a protection band;
`
`the base station system divides the uplink sub-frame into
`
`two parts on the time axis, and one part is used for sending
`
`the OFDMA uplink data and the other part is used for
`
`sending the OFDM uplink data;
`
`the region for sending the OFDMA uplink data send an
`
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`OFDMA uplink sub-frame according to the requirements of
`
`networking; and
`
`the region for sending the OFDM uplink data is divided
`
`into multiple sub-frequency bands (which can be divided
`
`evenly or unevenly, but generally evenly) by frequency
`
`domain, and an OFDM uplink sub-frame is sent in each
`
`sub-frequency band and the data in different frequency
`
`bands are sent in different sectors, and the frequency bands
`
`are separated by a protection band.
`
`The method for utilizing the frequency spectrum
`
`according to the present embodiment can also be that the
`
`base station system firstly divides a frame into two parts,
`
`and one part is used f