WO2008039027A1 - Procédé et appareil destinés à composer une trame dans un système de communication - Google Patents

Procédé et appareil destinés à composer une trame dans un système de communication Download PDF

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Publication number
WO2008039027A1
WO2008039027A1 PCT/KR2007/004761 KR2007004761W WO2008039027A1 WO 2008039027 A1 WO2008039027 A1 WO 2008039027A1 KR 2007004761 W KR2007004761 W KR 2007004761W WO 2008039027 A1 WO2008039027 A1 WO 2008039027A1
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WIPO (PCT)
Prior art keywords
frame
zone
sub
communication system
zones
Prior art date
Application number
PCT/KR2007/004761
Other languages
English (en)
Inventor
Mi-Hyun Lee
Sung-Kwon Hong
Hyun-Kyu Yu
Ki-Chun Cho
Young-Kyun Kim
Ho-Kyu Choi
Original Assignee
Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020070092737A external-priority patent/KR20080030475A/ko
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Publication of WO2008039027A1 publication Critical patent/WO2008039027A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • 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
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Definitions

  • the present invention relates to a method and an apparatus for composition of a frame which can provide compatibility between a legacy system and an evolution system in a mobile communication system.
  • a communication system is an Institute of Electrical and Electronic Engineers (IEEE) 802.16e communication system.
  • IEEE Institute of Electrical and Electronic Engineers
  • FIG. IA illustrates a frame structure of a conventional IEEE 802.16e communication system.
  • the IEEE 802.16e communication system is a system based on a Time Division Duplex (TDD) mode and an Orthogonal Frequency Division Multiple Access (OFDMA) scheme.
  • TDD Time Division Duplex
  • OFDMA Orthogonal Frequency Division Multiple Access
  • a frame of the TDD-OFDMA communication system includes a downlink (DL) sub-frame and an uplink (UL) sub-frame. Located between the DL and UL sub-frames are time gaps for operation switching.
  • the time gaps may include a Transmission/reception Time Gap (TTG) and a Reception/transmission Time Gap (RTG).
  • TTG Transmission/reception Time Gap
  • RMG Reception/transmission Time Gap
  • the DL sub-frame includes a preamble located at a front-most position, a first zone (1 st zone) for carrying control information, which is located next to the preamble, and a plurality of OFDMA burst zones (DL burst #1 to DL burst #5) for carrying actual DL data.
  • the UL sub-frame includes a zone for ranging, and a plurality of OFDMA burst zones (UL burst #1 to UL burst #3) for carrying data.
  • the ranging zone and the OFDMA burst zones defined by dotted lines in FIG. IA may be subjected to dynamic allocation according to the situation.
  • each of the DL sub-frame and the UL sub- frame includes a plurality of zones that are different from each other according to the sub-channel composition type.
  • zone composition information On the plurality of zones of both the DL frame and the UL frame is included, for example, in the control information located at the "1 st zone" next to the preamble of the DL sub- frame, and is then transmitted to a corresponding Mobile Station (MS).
  • the "1 st zone” is composed as a fixed sub-channel, and the zone composition information is appointed using STC DL Zone Switch_IE() or AAS_DL_IE(). Otherwise, when the zone composition information is located within the UL sub-frame, the zone composition information is appointed using UL Zone Switch_IE() or AAS_UL_IE().
  • the zones defined by solid lines, which include the preamble and the "1 st zone” correspond to fixed slots
  • the zones defined by dotted lines correspond to variable zones, the size and existence of which may be changed and determined according to the cell environment and operation.
  • FIG. 2A is a data flow diagram illustrating a Hybrid Automatic Retransmission Request (HARQ) operation for DL transmission of a conventional IEEE 802.16e communication system. It is assumed that the communication system is a wireless broadband communication system profiled in a Mobile WiMAX, and the HARQ follows a data transmission scheme based on a TDD frame having a length of 5 ms.
  • HARQ Hybrid Automatic Retransmission Request
  • an MS appoints burst assignment information and a UL feedback zone to an information element within the first zone 208 of the (i "1 )* frame 200, and transmits traffic in a corresponding burst zone according to the burst assignment information.
  • the MS decodes the burst assignment information and the traffic and feeds back an ACK or NACK message to a Base Station (BS) according to detection of an error in the traffic demodulated in a UL sub-frame period of the i ⁇ frame 202, which is the next frame after the data transmission is performed.
  • BS Base Station
  • the BS decodes the message fed back from the MS, and performs scheduling and encoding for data transmission and retransmission. Thereafter, during the period of the (i +2 ) ⁇ frame 206, the BS performs transmission and retransmission of the traffic transmitted in the (r 1 )* frame 200.
  • an HARQ retransmission delay 210 having a length of 15 ms, which corresponds to a latency of three frames 200, 202, and 204 in total, occurs in the DL data transmission.
  • FIG. 2B is a data flow diagram illustrating an HARQ operation for UL transmission of a conventional IEEE 802.16e communication system. It is assumed that the communication system is a wireless broadband communication system profiled in the Mobile WiMAX, and the HARQ follows a data transmission scheme based on a TDD frame having a length of 5 ms.
  • an MS is assigned bursts for UL transmission from an information element within the first zone 222 of the (P 1 )* frame 211. Then, the MS transmits data in a corresponding burst zone of the i ⁇ frame 212 based on the assignment information. Thereafter, during the period of the (i +1 ) ⁇ frame 214, the BS demodulates the data transmitted by the MS, generates a feedback ACK/NACK message according to a result of error detection, and performs scheduling for data transmission based on the result of the error detection. Then, during the period of the (i +2 ) ⁇ frame 216, the BS encodes and transmits the assignment information and the feedback message. Thereafter, in the (i +3 ) ⁇ frame 218, the BS performs transmission and retransmission of the traffic transmitted in the i ⁇ frame 212.
  • an HARQ retransmission delay 220 having a length of 15 ms, which corresponds to a latency of three frames 214, 216, and 218 in total, occurs in the UL data transmission.
  • the HARQ latency may increase.
  • the feedback delay described above such as an HARQ latency, may cause a serious problem in the performance of closed loop control, such as a transmit control protocol, data throughput, Automatic Retransmission Request (ARQ)/HARQ and power control.
  • ARQ Automatic Retransmission Request
  • An aspect of the present invention is to address at least the above- mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present invention is to provide a method and an apparatus for reliable real-time data transmission in a communication system.
  • aspect of the present invention is to provide a method and an apparatus for real-time data transmission, which have a short latency by supporting link adaptation for a fast moving speed and supporting HARQ for a real-time service in a communication system.
  • a method for composing of a frame including a first sub-frame and a second sub-frame in a communication system is provided.
  • the method includes generating a first zone supporting compatibility with another communication system within the first sub- frame, generating at least one second zone, which is a reverse directional link zone to a direction of the first sub-frame, within remaining zones of the first sub- frame except for the first zone, generating a third zone, which is a reverse directional link zone to a direction of the second sub-frame, within the second sub-frame and constructing a frame including the first zone, the second zone, and the third zone.
  • an apparatus for composing of a frame including a first sub-frame and a second sub-frame in a communication system includes a frame generator for generating a first zone supporting compatibility with another communication system within the first sub-frame, for generating at least one second zone, which is a reverse directional link zone to a direction of the first sub-frame, within remaining zones of the first sub-frame except for the first zone, for generating a third zone, which is a reverse directional link zone to a direction of the second sub-frame, within the second sub-frame and for constructing a frame including the first zone, the second zone, and the third zone.
  • FIG. IA illustrates a frame structure of a conventional IEEE 802.16e communication system
  • FIG. IB illustrates a frame structure including multiple zones in a conventional IEEE 802.16e communication system
  • FIG. 2A is a data flow diagram illustrating a Hybrid Automatic Retransmission Request (HARQ) operation for DL transmission of a conventional IEEE 802.16e communication system;
  • HARQ Hybrid Automatic Retransmission Request
  • FIG. 2B is a data flow diagram illustrating an HARQ operation for UL transmission of a conventional IEEE 802.16e communication system
  • FIG. 3 illustrates a scheme for composing a frame according to an exemplary embodiment of the present invention
  • FIG. 4 illustrates a scheme for composing a frame according to an exemplary embodiment of the present invention
  • FIG. 5A illustrates an evolution frame structure according to an exemplary embodiment of the present invention, in which fixed zones of a DL sub- frame and a UL sub-frame have the same size;
  • FIG. 5B illustrates an evolution frame structure according to an exemplary embodiment of the present invention, in which fixed zones of a DL sub-frame and a UL sub-frame have different sizes;
  • FIG. 5C illustrates another evolution frame structure according to an exemplary embodiment of the present invention, in which fixed zones of a DL sub-frame and a UL sub-frame have different sizes;
  • FIG. 6A illustrates a frame structure according to an exemplary embodiment of the present invention, in which the ratio of DL to UL is 1 :1;
  • FIG. 6B illustrates another frame structure according to an exemplary embodiment of the present invention, in which the ratio of DL to UL is 2: 1;
  • FIG. 6C illustrates another frame structure according to an exemplary embodiment of the present invention, in which the ratio of DL to UL is 3:2;
  • FIG. 7 is a flow diagram of an FIARQ operation of DL data transmission in a frame structure according to an exemplary embodiment of the present invention in which the frame structure has a 2: 1 mode and follows a TDD scheme;
  • FIG. 8 is a flow diagram of an FIARQ operation of UL data transmission in a frame structure according to an exemplary embodiment of the present invention.
  • FIG. 9 illustrates a method for coexistence of a legacy MS and an evolution MS in a frame structure according to an exemplary embodiment of the present invention
  • FIG. 1OA illustrates reverse directional link interference occurring between a cell providing a legacy service and a cell providing an evolution service according to an exemplary embodiment of the present invention
  • FIG. 1OB illustrates a method for setting a limited zone for removal of the interference according to an exemplary embodiment of the present invention
  • FIG. 11 illustrates a table containing parameters indicating information elements of a plurality of time zones according to an exemplary embodiment of the present invention
  • FIG. 12 is a block diagram illustrating a transmitter according to an exemplary embodiment of the present invention.
  • FIG. 13 is a flow diagram of an operation of a frame generator according to an exemplary embodiment of the present invention.
  • the present invention proposes a method and an apparatus for composing a frame in a communication system, which can provide compatibility between a legacy system and an evolution system providing an evolution service, and has a short latency to improve the transmission efficiency especially in the evolution system.
  • the evolution system is a broadband wireless communication system, which is not only compatible with a legacy system, for example, a system providing a commercialized service according to the IEEE 802.16e standard or the Mobile WiMAX certification profile, but also can achieve a capability higher than that of the legacy system.
  • each sub-frame period includes a plurality of time zones, and control information is appointed to each of the time zones so that scheduling and control can be performed for each of the time zones.
  • a control channel period of the legacy service is provided as a fixed zone, and the remaining periods other than the fixed zone are composed as a plurality of UL/DL time zones (short PHYs) to which corresponding UL/DL resources are allocated according to a UL/DL ratio.
  • the fixed zone includes a preamble having one symbol, and a Partial Usage of Sub Channel (PUSC) zone, which is the 1 st zone for transmitting burst allocation/control information.
  • PUSC Partial Usage of Sub Channel
  • the fixed zone is arranged as an independent zone separated from the DL/UL time zones.
  • exemplary embodiments of the present invention propose a method for achieving fast feedback and transmission by constructing at least one zone from among a plurality of time zones into a zone of a reverse directional link of a corresponding sub-frame. That is, at least one time zone, from among a plurality of time zones of a DL sub-frame, is arranged as a "UL time zone (UL short PHY)" for UL transmission, and at least one time zone from among a plurality of time zones of a UL sub-frame is arranged as a "DL time zone (DL short PHY)" for DL transmission.
  • UL time zone UL short PHY
  • FIG. 3 illustrates a scheme for composing a frame according to an exemplary embodiment of the present invention.
  • a frame 300 is divided into a DL sub-frame 302 and a UL sub-frame 304.
  • an interval for compatibility with a legacy system is arranged as a fixed zone 306.
  • the fixed zone 306 includes a preamble having one symbol, and a 1st zone following the preamble, which contains burst allocation/control information including Partial Usage of Sub Channels (PUSCs). That is, the fixed zone 306 is arranged as an independent zone separated from the DLAJL time zones.
  • the remaining OFDMA symbol periods other than the fixed zone 306 within the entire frame 300 are composed as the time zone 308.
  • the time zone frames 308 are allocated as periods for DL/UL transmission according to a ratio of DLAJL, for example, a ratio of M:N.
  • M refers to the number of DL time zones within the entire frame 300
  • N refers to the number of UL time zones within the entire frame 300.
  • FIG. 4 illustrates a scheme for composing a frame according to another exemplary embodiment of the present invention.
  • a portion of the control channel of the DL sub-frame and a portion of the control channel of the UL sub-frame are set as fixed zones, respectively.
  • the fixed zone of the DL sub-frame is set as shown in FIG. 3, while one time zone within the UL sub-frame is set as the fixed zone.
  • the DL and UL fixed zones support control information of a legacy system first of all, and can be used in an evolution system. Further, the fixed zone can be used not only for transmission of control information but also for other uses, e.g., for data transmission.
  • the fixed zone uses a sub-channel assignment scheme (PUSC) supportable by a legacy system, in consideration of the compatibility with a legacy service.
  • PUSC sub-channel assignment scheme
  • the other time zones except for the fixed zone can be constructed to employ a subchannel assignment scheme and a control scheme different from those of a legacy system.
  • the frame 400 includes a DL sub-frame 402 including a DL fixed zone 406 for a DL control channel, and a UL sub-frame 404 including a UL fixed zone for a UL control channel.
  • the DL fixed zone 406 includes a preamble having one symbol, and includes a 1 st zone 406following the preamble, which contains burst allocation/control information including PUSCs.
  • the UL fixed zone includes one time zone in which a UL control channel including UL PUSCs is located.
  • the other OFDMA symbol periods are divided into predetermined time zones, which are then distributed to DL/UL transmission periods at a ratio of M:N, which is the ratio of UL/DL.
  • M refers to the number of time zones for DL transmission within the entire frame
  • N refers to the number of time zones for UL transmission within the entire frame.
  • the number of OFDMA symbols constituting the time zone is determined in consideration of the size (the number of symbols) of the time zone, the frame length (the number of symbols) of a legacy service, a sub-channel assignment scheme, latency, etc.
  • the number, of symbols constituting the time zone may change according to the zone size of each sub-frame.
  • FIG. 5A illustrates an evolution frame structure according to an exemplary embodiment of the present invention, in which fixed zones of a DL sub- frame and a UL sub-frame have the same size.
  • the frame structure shown in FIG. 5A is based on an example having parameters in which the ratio of DL:UL is 17:15 and each time zone has the same size in a 5 ms frame structure supporting an 8.75 MHz bandwidth, which is one of the Mobile WiMAX profiles.
  • the time zones may have different sizes according to the situation.
  • each of the fixed zone 506 of the DL sub- frame and the fixed zone 510 of the UL sub-frame includes three symbols, and each of the other zones, except for the fixed zones 506 and 510, is constructed as one time zone frame 508 including six symbols.
  • FIG. 5B illustrates an evolution frame structure according to an exemplary embodiment of the present invention, in which fixed zones of a DL sub-frame and a UL sub-frame have different sizes.
  • the frame structure shown in FIG. 5B is based on an example having parameters in which the ratio of DL:UL is 17:15 and each time zone has the same size in a 5 ms frame structure supporting an 8.75 MHz bandwidth, which is one of the Mobile WiMAX profiles.
  • the DL fixed zone 512 of the DL sub- frame includes three symbols
  • the UL fixed zone 516 of the UL sub-frame includes six symbols
  • each of the other zones, that is, each time zone frame 514 includes nine symbols.
  • FIG. 5C illustrates another evolution frame structure according to an exemplary embodiment of the present invention, in which fixed zones of a DL sub-frame and a UL sub-frame have different sizes.
  • the frame structure shown in FIG. 5C is based on an example having parameters in which the ratio of DL:UL is 17: 15 and each time zone has the same size in a 5 ms frame structure supporting an 8.75 MHz bandwidth, which is one of the Mobile WiMAX profiles.
  • the DL fixed zone 518 of the DL sub- frame includes nine symbols
  • the UL fixed zone 522 of the UL sub-frame includes six symbols
  • each of the other zones, that is, each time zone frame 520 includes nine symbols.
  • FIG. 6A illustrates a frame structure according to an exemplary embodiment of the present invention, in which the ratio of DL to UL is 1 : 1.
  • the frame shown in FIG. 6A has a structure of 1 : 1 mode in which UL is allocated to a total of three time zones PHY 1, PHY 3, and PHY 5 and DL is allocated to a total of three time zones PHY 0, PHY 2 and PHY 4.
  • the frame includes a DL fixed zone 600 and a UL fixed zone 602.
  • FIG. 6B illustrates another frame structure according to an exemplary embodiment of the present invention, in which the ratio of DL to UL is 2: 1.
  • the frame shown in FIG. 6B has a structure of 2:1 mode in which DL is allocated to four time zones PHY 0, PHY 1, PHY 3, and PHY 4, and UL is allocated to the remaining two time zones PHY 2 and PHY 5.
  • the ratios 1 :1 and 2: 1 of FIGs. 6A and 6B refer to DLAJL ratios of the time zones within one frame.
  • the frame structures can be extended into a super-frame structure by grouping multiple frames based on the DL/UL ratio and the number of symbols within the time zone frame.
  • FIG. 6C illustrates another frame structure according to an exemplary embodiment of the present invention, in which the ratio of DL to UL is 3:2.
  • the illustrated frame structure corresponds to one frame in which time zones are distributed at a ratio of 3:2.
  • the illustrated frame is added to four additional frames to construct a super-frame including a total of five frames. That is, each frame of the super- frame has a structure of 3:2 mode in which DL is allocated to three time zones PHY 0, PHY 1, and PHY 2, and UL is allocated to the remaining two time zones PHY 3 and PHY 4.
  • the remaining time zone PHY 5 other than the five time zones within the frame belongs to DL time zones of a next frame. Accordingly, five frames are constructed into one super-frame in order to support the ratio of 3:2.
  • the structure of a super- frame and the number of UL zones within each sub-frame change according to the ratio of UL/DL.
  • a fixed control slot is arranged and is used for compatibility with a legacy service, as in a legacy system.
  • a time zone for a link in a direction reverse to a direction of a corresponding link is arranged in a legacy link, so that a time gap for switching according to link direction change of the time zone is necessary.
  • the time gap for the switching can be obtained by changing the length of a Cyclic Prefix (CP) of an Orthogonal Frequency Division Multiple Access (OFDMA) symbol in the other periods except for the fixed zone of a corresponding frame.
  • CP Cyclic Prefix
  • OFDMA Orthogonal Frequency Division Multiple Access
  • a gain in view of the latency achievable by the present invention is described based on an HARQ operation, which is an example of a closed loop control scheme.
  • the following description is based on an example of a legacy system in which one frame has a length of 5 ms, a DL zone includes 27 symbols, a UL zone includes 15 symbols, and each symbol has a length of 1/8 CP according to the IEEE 802.16e Ik Fast Fourier Transform (FFT).
  • FFT Fast Fourier Transform
  • FIG. 7 is a flow diagram of an HARQ operation of DL data transmission in a frame structure according to an exemplary embodiment of the present invention.
  • the frame structure has a 2: 1 mode and follows a TDD scheme.
  • first data transmission is performed in a time zone DLl of the (i "1 )* frame 700.
  • latency #1 706 up to a time point of next transmission or retransmission of the data that is, a latency from the time zone DLl to the time zone DL2 of the i ⁇ frame 702 for next transmission/retransmission of the data, is 6.4 ms.
  • latency #2 708 from the time zone DL2 of the i ⁇ frame 702 for the data transmission/retransmission to the time zone DLl of the frame next to the (I +1 ) 111 frame 704 for next data transmission/retransmission is 8.6 ms. Therefore, an average value of the two latencies #1 and #2 is 7.5 ms, which is about 1/2 of the latency in the conventional method.
  • the method illustrated in FIG. 7 can achieve rapid data transmission.
  • FIG. 8 is a flow diagram of an HARQ operation of UL data transmission in a frame structure according to an exemplary embodiment of the present invention.
  • first data transmission is performed in a time zone ULO of the (i "1 )* frame 800.
  • latency #1 808 up to a time point of next transmission or retransmission of data that is, a latency from the time zone ULO to the time zone ULl of the i ⁇ frame 802 for next transmission/retransmission of the data, is 7.4 ms.
  • latency #2 810 from the time zone ULl of the i ⁇ frame 802 for the data transmission/retransmission, through the (J +1 )* frame 804, to the time zone ULO of the frame next to the (i +2 ) ⁇ frame 806 for next data transmission/retransmission, is 7.4 ms. Therefore, an average value of the two latencies #1 and #2 is 7.4 ms, which is about 1/2 of the latency of the conventional method. Thus, the method illustrated in FIG. 8 can achieve rapid data transmission.
  • a frame structure according to an exemplary embodiment of the present invention can reduce latency by approximately 50% in comparison with the conventional frame structure.
  • Exemplary embodiments of the present invention can take into consideration not only the compatibility with a legacy system but also coexistence with a legacy system.
  • an MS capable of supporting a legacy communication system supporting a legacy service is referred to as a "legacy MS”
  • an MS capable of supporting an evolution communication system supporting an evolution service is referred to as an "evolution MS.”
  • IEEE 802.16e or Mobile WiMAX is mentioned as an example of the legacy system in the above description, it is of course possible to apply the present invention to another system capable of supporting a broadband service.
  • FIG. 9 illustrates a method for coexistence of a legacy MS and an evolution MS in a frame structure according to an exemplary embodiment of the present invention.
  • an evolution MS has a fixed zone, one DL time zone DLO, and one UL time zone ULO in a DL sub-frame zone 900, and has a fixed zone and one DL time zone DL3 in a UL sub-frame zone 902.
  • the fixed zones can be used not only for the legacy MS but also for an evolution MS.
  • a legacy MS has two DL time zones DLO and DL2 in the DL sub-frame zone 900 and has one UL time zone ULl in the UL sub-frame zone 902. Since the time zones are units for simple division of each frame zone, two adjacent time zones can be actually combined into one zone. Further, the time zones can coexist in the form of Time Division Multiplexing (TDM). Moreover, in the case of the other time zones except for the time zones assigned a link reverse to the direction of a corresponding sub-frame, a legacy service and an evolution service can coexist in the form of Frequency Division Multiplexing (FDM) through allocation of OFDMA bursts using the same sub-channel scheme.
  • TDM Time Division Multiplexing
  • FDM Frequency Division Multiplexing
  • At least one UL time zone is located within a DL sub-frame zone, and at least one DL time zone is located within a UL sub- frame zone.
  • reverse directional interference occurs between the UL time zone and the DL time zone.
  • communication is restrictively scheduled.
  • FIGs. 1OA and 1OB illustrate a frame structure of time zones according to an exemplary embodiment of the present invention, in which reverse directional link interference occurs between a cell providing a legacy service and a cell providing an evolution service.
  • reverse directional link interference occurs in the UL time zone ULO within the DL sub-frame zone 1000 and the DL time zone DL3 within the UL sub-frame zone 1002.
  • information on the zones 1004 and 1006 corresponding to the zones ULO and DL3 in which the reverse directional link interference occurs in a legacy MS is appointed to a limited zone and the limited zone is then scheduled mainly for communication with an MS that is hardly influenced by the interference.
  • FIG. 11 illustrates a table containing parameters indicating information elements of a plurality of time zones according to an exemplary embodiment of the present invention.
  • the IEEE 802.16e standard defines "STC DL Switch IE()" and "STC DL Zone IE(),” which are zone indicators for providing zone composition information for the time zones of the DL sub- frame, and "UL Zone Switch lEO” and “AAS_UL_IE(),” which are zone indicators for providing zone composition information for the time zones of the UL sub-frame. That is, the zone indicators include information to indicate if a corresponding zone is for an evolution service, direction information on a corresponding link, etc., by using one reserved bit within a legacy information element.
  • the evolution MS can recognize if the corresponding zone is an evolution zone or a legacy zone, through the information contained in the information element. In contrast, since the legacy MS cannot recognize an indicated bit of an evolution zone indicated by the zone indicator, the legacy MS recognizes the corresponding zone as a "don't care" zone. Further, when its own burst is not allocated within that zone, the legacy MS disregards it.
  • FIG. 12 is a block diagram illustrating a transmitter according to an exemplary embodiment of the present invention.
  • the transmitter includes a frame generator 1202, a resource mapper 1204, an Inverse Fast Fourier Transform (IFFT) unit 1206, a symbol contractor 1208, a Cyclic Prefix (CP) inserter 1210, a Digital to Analog Converter (DAC) 1212, a transmission switch 1214, and a transmission controller 1216.
  • IFFT Inverse Fast Fourier Transform
  • CP Cyclic Prefix
  • DAC Digital to Analog Converter
  • the frame generator 1202 Under the control of the transmission controller 1216, the frame generator 1202 performs encoding, etc., so as to generate information to be transmitted, and the generated information is mapped to one or more sub-channels by the resource mapper 1204. At this time, the sub-carriers in each sub-channel are allocated according to a block scheme, an interleave scheme, or a block-interleave scheme. Specifically, the frame generator 1202 generates fixed zones within a frame including a DL sub-frame and a UL sub-frame, and sets the other zones of the frame, except for the fixed zones, as time zones.
  • the frame generator 1202 generates a fixed zone only in the DL sub-frame or generates fixed zones in both the DL sub-frame.
  • the frame generator 1202 composes at least one time zone as a reverse directional link zone with respect to the link direction of a corresponding sub- frame.
  • FIG. 13 is a flow diagram of an operation of a frame generator according to an exemplary embodiment of the present invention.
  • the frame generator generates a fixed zone within a predetermined zone.
  • the fixed zone includes a zone for burst allocation and control information transmission for a compatibility with a legacy system.
  • step 1305 the frame generator generates at least one time zone within the other zone except for the fixed zone. Then, in step 1310, the frame generator constructs a frame including the fixed zone and the time zone.
  • Exemplary embodiments of the present invention provide a method and an apparatus for composing a frame that includes a fixed zone for transmission of control information and a reverse directional link zone of a corresponding sub- frame inserted between multiple time zones, so as to achieve a short latency in a broadband wireless access system. Therefore, the present invention can achieve rapid real time data transmission and improved transmission efficiency by a closed loop control. While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un appareil et un procédé destinés à composer une trame comprenant une première sous-trame et une seconde sous-trame dans un système de communication. Le procédé consiste à produire une première zone assurant une compatibilité avec un autre système de communication dans la première sous-trame; produire au moins une deuxième zone qui est une zone de lien directionnel inverse à la direction de la première sous-trame, dans les zones restantes de la première sous-trame excepté la première zone; produire une troisième zone qui est une zone de lien directionnel inverse à la direction de la seconde sous-trame, dans la seconde sous-trame; et élaborer une trame comprenant la première zone, la deuxième zone et la troisième zone. Le procédé permet d'obtenir un temps d'attente court dans un système évolutif pour améliorer les performances d'un système d'accès hertzien large bande. Le procédé permet également d'obtenir une transmission de données en temps réel rapide et une efficacité de transmission améliorée par une commande en boucle fermée efficace.
PCT/KR2007/004761 2006-09-28 2007-09-28 Procédé et appareil destinés à composer une trame dans un système de communication WO2008039027A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2006-0094697 2006-09-28
KR20060094697 2006-09-28
KR1020070092737A KR20080030475A (ko) 2006-09-28 2007-09-12 통신 시스템에서 프레임 구성 방법 및 장치
KR10-2007-0092737 2007-09-12

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WO2008039027A1 true WO2008039027A1 (fr) 2008-04-03

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Cited By (5)

* Cited by examiner, † Cited by third party
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WO2009060164A1 (fr) * 2007-11-06 2009-05-14 Fujitsu Limited Structure de trame pour un système de communication sans fil
WO2010130120A1 (fr) * 2009-05-15 2010-11-18 中兴通讯股份有限公司 Distribution de sous-trames de liaison descendante, procédé d'acquisition et de transmission d'informations pour un système d'évolution wimax
WO2011073737A1 (fr) * 2009-12-18 2011-06-23 Nokia Corporation Procédé et appareil pour établir un schéma de communication présentant un retard de rétroaction réduit
US8792467B2 (en) 2008-09-27 2014-07-29 Zte Corporation Method for downlink sub-frame allocation, information transmission or acquisition in a WiMax evolved system
EP2382729A4 (fr) * 2009-01-05 2017-06-21 Intel Corporation Contrôle de temporisation harq dans des systèmes de communication sans fil

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US6891810B2 (en) * 2001-01-19 2005-05-10 Raze Technologies, Inc. Wireless access system and associated method using multiple modulation formats in TDD frames according to subscriber service type
US20060193286A1 (en) * 2005-01-31 2006-08-31 Nokia Corporation Communications system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6891810B2 (en) * 2001-01-19 2005-05-10 Raze Technologies, Inc. Wireless access system and associated method using multiple modulation formats in TDD frames according to subscriber service type
US20060193286A1 (en) * 2005-01-31 2006-08-31 Nokia Corporation Communications system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009060164A1 (fr) * 2007-11-06 2009-05-14 Fujitsu Limited Structure de trame pour un système de communication sans fil
US20110158196A1 (en) * 2007-11-06 2011-06-30 Fujitsu Limited Frame structure for a wireless communication system
US8036145B2 (en) 2007-11-06 2011-10-11 Fujitsu Limited Frame structure for a wireless communication system
US9270508B2 (en) 2007-11-06 2016-02-23 Fujitsu Limited Frame structure for a wireless communication system
US8792467B2 (en) 2008-09-27 2014-07-29 Zte Corporation Method for downlink sub-frame allocation, information transmission or acquisition in a WiMax evolved system
EP2382729A4 (fr) * 2009-01-05 2017-06-21 Intel Corporation Contrôle de temporisation harq dans des systèmes de communication sans fil
WO2010130120A1 (fr) * 2009-05-15 2010-11-18 中兴通讯股份有限公司 Distribution de sous-trames de liaison descendante, procédé d'acquisition et de transmission d'informations pour un système d'évolution wimax
EP2418886A1 (fr) * 2009-05-15 2012-02-15 ZTE Corporation Distribution de sous-trames de liaison descendante, procédé d'acquisition et de transmission d'informations pour un système d'évolution wimax
EP2418886A4 (fr) * 2009-05-15 2014-08-20 Zte Corp Distribution de sous-trames de liaison descendante, procédé d'acquisition et de transmission d'informations pour un système d'évolution wimax
WO2011073737A1 (fr) * 2009-12-18 2011-06-23 Nokia Corporation Procédé et appareil pour établir un schéma de communication présentant un retard de rétroaction réduit
US9560648B2 (en) 2009-12-18 2017-01-31 Nokia Technologies Oy Methods and apparatus for providing a communication scheme with reduced feed-back delay

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