WO2010002219A2 - Procédé permettant de réaliser une communication avec coexistence de systèmes à l'aide de l'allocation de trame - Google Patents

Procédé permettant de réaliser une communication avec coexistence de systèmes à l'aide de l'allocation de trame Download PDF

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Publication number
WO2010002219A2
WO2010002219A2 PCT/KR2009/003645 KR2009003645W WO2010002219A2 WO 2010002219 A2 WO2010002219 A2 WO 2010002219A2 KR 2009003645 W KR2009003645 W KR 2009003645W WO 2010002219 A2 WO2010002219 A2 WO 2010002219A2
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WIPO (PCT)
Prior art keywords
frame
pattern
heterogeneous communication
interval
coexistence
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Application number
PCT/KR2009/003645
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English (en)
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WO2010002219A3 (fr
Inventor
Jin Lee
Tae Gon Kong
Yong Ho Kim
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Lg Electronics Inc.
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Publication date
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Publication of WO2010002219A2 publication Critical patent/WO2010002219A2/fr
Publication of WO2010002219A3 publication Critical patent/WO2010002219A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1215—Wireless traffic scheduling for collaboration of different radio technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to IEEE 802.16m system, and more particularly, to a method of enabling a mobile station having an IEEE 802.16m wireless interface to perform communication with each system while minimizing interference due to Bluetooth or Wi-Fi.
  • Bluetooth is a technical standard that enables mobile phones, computers, PDA, etc. to perform communication with phones or computers of homes or companies, which use a short- distance wireless access system.
  • an ISM band with a frequency of 2.45GHz is used, an available maximum communication range is 10m, and data transmission is performed at a speed of IMbps (version 1.0) .
  • FIG. 1 is a diagram illustrating a structure of a Bluetooth system.
  • Bluetooth In the Bluetooth system, communication is performed in a master-slave structure. Communication devices form one cell called Piconet, wherein one Piconet includes one master and maximum seven slaves. Direct communication cannot be performed between the respective slaves except a discovery step.
  • the master is involved in channel allocation for reserving a transmission opportunity of the slaves or establishment for communication .
  • a Bluetooth device can use one physical channel one time and uses a time division multiplex (TDM) mode between channels to ensure several operations at the same time. In this way, the Bluetooth device can be operated in several Piconets.
  • TDM time division multiplex
  • SCO Serial Connection Oriented
  • SCO Synchronous Connection Oriented
  • Packet is allowed for only a single time slot.
  • ESCO Extended SCO
  • ESCO Extended SCO
  • ACL Asynchronous Connection Oriented
  • ACL Asynchronous Connection Oriented
  • FIG. 2a is a diagram illustrating a Bluetooth multi-slot packet structure.
  • a basic Piconet physical channel is divided into time slots of 625As.
  • a TDD scheme is used, wherein a master and a slave are used asynchronously and packets are allocated together when the slots start.
  • the packets can be transmitted using five time slots once, and the number of time slots occupied for one transmission can be determined in accordance with packet types.
  • FIG. 2b is a diagram illustrating transmission between a master and a slave in case of a single slot packet such as SCO type.
  • FIG. 2b illustrates a multi-slave structure in which communication between one master and slaves 1 and 2 is performed.
  • the master allocates a transmitting interval to the slave 1 and a receiving interval for the slave 1. Since there is no interval for the slave 2, the slave 2 does not need a slave slot from the master. For the second transport interval, the master allocates a transmitting interval to the slave 2 and a receiving interval for the slave 2.
  • the master allocates a time slot for a corresponding slave for the third and fourth time slot intervals, whereby the master can perform communication with maximum seven slaves within one Piconet.
  • FIG. 2c is a diagram illustrating an example of eSCO window 6 having a single slot packet size.
  • a retransmission window (Wesco) is 4, and a period (Tesco) until next eSCO instance is 8. Accordingly, in order to transmit a single time slot packet from the master to the slave or from the slave to the master, a time equivalent to minimum (625us*2) is required when retransmission is not considered.
  • FIG. 3 is a diagram illustrating a frame structure of IEEE 802.16m system.
  • a super frame has a length of 20ms, and includes four frames of 5ms, wherein one frame includes eight subframes. Each subframe is allocated for uplink (UL) or downlink (DL) transmission. In FIG. 3, subframes included in one frame are allocated to the uplink and the downlink at a rate of 5:3.
  • One subframe includes six symbols, and has a length of 617us.
  • a super frame header (SFH) is transmitted per 20ms, and can be transmitted to a secondary broadcast channel (SBCH) and a primary broadcast channel (PBCH) , wherein the secondary broadcast channel includes cell-specific system information and the primary broadcast channel includes common system information.
  • SBCH secondary broadcast channel
  • PBCH primary broadcast channel
  • the secondary broadcast channel includes cell-specific system information and the primary broadcast channel includes common system information.
  • MAP location is flexible and uplink/downlink can be indicated from MAP within a current frame, latency in data transmission
  • FIG. 4 is a diagram illustrating relation between a communication band of Bluetooth and Wi-FI and its neighboring communication band.
  • the IEEE 802.16m system uses a frequency band and a neighboring band, which are used by Bluetooth and Wi-FI system, when several wireless techniques located within mobile stations are used independently or simultaneously, serious interference occurs.
  • the IEEE 802.16m system and the Bluetooth system are operated independently, when the mobile station receives data from the IEEE 802.16m system, Bluetooth data packets should not be transmitted.
  • the mobile station tries communication with a Bluetooth network for a slip interval using a power saving class mode and performs communication with a WiMAX network for a listening interval, whereby interference between the systems is minimized.
  • the mobile station can intermittently use Bluetooth in accordance with a power saving class mode of a broadband wireless access system.
  • a first object to be achieved by the present invention is to provide a method for efficiently performing heterogeneous communication system coexistence in a mobile station having two or more heterogeneous communication interfaces while minimizing frequency interference.
  • a second object to be achieved by the present invention is to provide a method for performing coexistence communication in a mobile station having two or more heterogeneous communication interfaces to efficiently perform coexistence operation while minimizing frequency interference.
  • a method of performing coexistence communication with heterogeneous communication systems using a time division mode comprises the steps of transmitting frame pattern information corresponding to a coexistence communication status from a mobile station to a base station through a coexistence interval request message; receiving a coexistence configuration indicator of the frame pattern through a super frame header after a grant message of the frame pattern is received; and performing heterogeneous communication in a heterogeneous communication interval corresponding to the frame pattern.
  • the heterogeneous communication interval is to perform heterogeneous communication with at least one of Bluetooth and Wi-Fi.
  • the coexistence configuration indicator is transmitted through at least one of a primary broadcast channel (PBCH) and a secondary broadcast channel (SBCH) of the super frame header.
  • PBCH primary broadcast channel
  • SBCH secondary broadcast channel
  • the frame pattern is a pattern where the heterogeneous communication interval directly adjoins a first downlink subframe of each frame.
  • the frame pattern is a pattern where the heterogeneous communication interval directly adjoins a second downlink subframe in a frame to which the super frame header belongs, and in the other frames, the heterogeneous communication interval directly adjoins a first downlink subframe of each frame.
  • the frame pattern is a pattern where the heterogeneous communication interval is located between a third downlink subframe of each frame and a switching time interval.
  • the frame pattern is a pattern where a predetermined number of downlink subframes and uplink subframes are arranged per frame.
  • the step of performing the heterogeneous communication includes stopping communication using a subframe of IEEE 802.16m.
  • a method of performing coexistence communication with heterogeneous communication systems using a time division mode comprises the steps of receiving frame pattern information corresponding to a coexistence communication status from a mobile station through a coexistence interval request message; transmitting a grant message of the frame pattern to the mobile station; transmitting a coexistence configuration indicator of the frame pattern through a super frame header; and allocating subframes after the super frame header by considering a heterogeneous communication interval corresponding to the frame pattern.
  • the heterogeneous communication interval is to perform heterogeneous communication with at least one of Bluetooth and Wi-Fi.
  • the coexistence configuration indicator is transmitted through at least one of a primary broadcast channel
  • PBCH primary broadcast channel
  • SBCH secondary broadcast channel
  • the frame pattern is a pattern where the heterogeneous communication interval directly adjoins a first downlink subframe of each frame.
  • the frame pattern is a pattern where the heterogeneous communication interval directly adjoins a second downlink subframe in a frame to which the super frame header belongs, and in the other frames, the heterogeneous communication interval directly adjoins a first downlink subframe of each frame.
  • the frame pattern is a pattern where the heterogeneous communication interval is located between a third downlink subframe of each frame and a switching time interval.
  • the frame pattern is a pattern where a predetermined number of downlink subframes and uplink subframes are arranged per frame.
  • the mobile station having IEEE 802.16m wireless interface can perform communication with each system while minimizing interference caused by Bluetooth or Wi-Fi by using a frame pattern for interval allocation of Bluetooth or Wi-Fi system, wherein the Bluetooth system and the Wi-Fi system belong to a neighboring band range.
  • FIG. 1 is a diagram illustrating a structure of a Bluetooth system.
  • FIG. 2a is a diagram illustrating a Bluetooth multi-slot packet structure.
  • FIG. 2b is a diagram illustrating transmission between a master and a slave in case of a single slot packet such as SCO type.
  • FIG. 2c is a diagram illustrating an example of eSCO window 6 having a single slot packet size.
  • FIG. 3 is a diagram illustrating a frame structure of IEEE 802.16m system.
  • FIG. 4 is a diagram illustrating relation between a communication band of Bluetooth and Wi-FI and its neighboring communication band.
  • FIG. 5 is a diagram illustrating a procedure of applying a coexistence communication pattern to a super frame in accordance with one embodiment of the present invention.
  • FIG. 6 is a diagram illustrating a super frame to which a communication pattern is applied after coexistence communication starts .
  • FIG. 7 is a diagram illustrating an example of a frame allocation mode for Bluetooth in the IEEE 802.16m system in case of Bluetooth esco single slot of Tesco 6.
  • FIG. 8 is a diagram illustrating an example of a frame allocation mode for Bluetooth in the IEEE 802.16m system in case of Bluetooth esco single slot with Tesco 6 and Wesco 4.
  • FIG. 9 is a diagram illustrating another example of a frame allocation mode for Bluetooth in the IEEE 802.16m system in case of Bluetooth esco single slot with Tesco 6 and Wesco 4.
  • FIG. 10 is a diagram illustrating still another example of a frame allocation mode for Bluetooth in the IEEE 802.16m system in case of Bluetooth esco single slot with Tesco 6 and Wesco 4.
  • FIG. 11 is a diagram illustrating further still another example of a frame allocation mode for Bluetooth in the IEEE 802.16m system in case of Bluetooth esco single slot with Tesco 6 and Wesco 4.
  • FIG. 12 is a diagram illustrating Bluetooth packet transmission and IEEE 802.16m packet transmission, which are simultaneously performed in a downlink frame interval of IEEE 802.16m frame.
  • the embodiments of the present invention provide a method for reducing interference during communication between mobile stations and each system when a mobile station having wireless interfaces of Bluetooth system and IEEE 802.16m system tries communication by using the two systems together under a network where the Bluetooth system and IMT-Advanced system, i.e., the IEEE 802.16m system coexist.
  • an interval that enables communication with each system is efficiently allocated to the mobile station, whereby the mobile station can receive a seamless service from the Bluetooth/Wi-Fi system and the IEEE 802.16m system.
  • the IEEE 802.16m system allocates an interval for Bluetooth or Wi-Fi to a mobile station having several wireless interfaces (for example, IEEE 802.16m, Bluetooth, and Wi-Fi) will be described.
  • the mobile station can transfer an IEEE 802.16m MAC message requesting coexistence or an indicator for coexistence to a base station.
  • the base station which has acquired the IEEE 802.16m MAC message or the indicator for coexistence can transfer frame allocation information for Bluetooth or Wi-Fi to the mobile station through a broadcast channel (BCH) .
  • BCH broadcast channel
  • FIG. 5 is a diagram illustrating a procedure of applying a coexistence communication pattern to a super frame in accordance with one embodiment of the present invention.
  • the base station broadcasts configuration information of a current super frame through a channel of a first subframe, i.e., broadcast channel, or a super frame header, wherein a super frame starts from the first subframe (501) .
  • broadcast channels i.e., a primary broadcast channel (PBCH) and a secondary broadcast channel (SBCH) can exist in the super frame header.
  • PBCH primary broadcast channel
  • SBCH secondary broadcast channel
  • the mobile station If a coexistence communication status occurs, the mobile station notifies the base station of this status and transmits a desired frame pattern to the base station (502) .
  • the desired frame pattern (xx) is selected considering transmission features of heterogeneous communication systems (Bluetooth and Wi-Fi) which the mobile station desires to use simultaneously.
  • the base station which has received the frame pattern desired by the mobile station can accept the frame pattern, transmit the frame pattern by changing it to a supportable pattern, or reject coexistence communication.
  • FIG. 5 illustrates that the base station accepts the frame pattern desired by the mobile station (503) .
  • the base station After receiving a coexistence communication request, the base station transmits a broadcast channel transmitted with start of next super frame, wherein the broadcast channel includes an indicator indicating communication configuration used in a super frame (504) .
  • the mobile stations within a base station region, which have received the indicator, should perform communication in accordance with a frame pattern indicated by the indicator.
  • the base station can transmit the frame pattern when periodically transmitting system information, and can control a transmission period in accordance with an importance level.
  • the mobile station may receive the frame pattern by requesting the base station of the frame pattern before starting coexistence communication.
  • the super frame header indicating coexistence communication is transmitted as far as coexistence communication continues (505).
  • the mobile station transmits a request, which includes a frame pattern (yy) to be changed, to the base station (506) .
  • the base station which has received the frame pattern change request can accept the request, transmit the frame pattern by changing it, or reject the frame pattern change request.
  • FIG. 5 illustrates that the base station accepts the frame pattern change request (507).
  • the changed frame pattern is applied to next super frames of the requested super frame, and the base station broadcasts the changed frame pattern through the super frame header (508).
  • the applied frame pattern is expressed in each super frame and then transmitted as far as coexistence communication continues (509) .
  • the mobile station transmits a coexistence communication termination request to the base station (510) .
  • the base station which has received the coexistence communication termination request grants coexistence communication termination (511) .
  • the super frame started after the termination is granted is not a coexistence frame pattern but a super frame of which total frames are set for IEEE 802.16m (512).
  • FIG. 6 is a diagram illustrating a super frame after coexistence communication starts.
  • a coexistence configuration indicator is included in the broadcast channel, i.e., the primary broadcast channel or the secondary broadcast channel, which is included in the start of the super frame.
  • the coexistence configuration indicator may- indicate a number of the applied frame pattern, or may indicate whether the coexistence frame pattern is currently used, by using an indicator bit. In case of the latter case, the coexistence configuration indicator may indicate a location of a region that delivers a pattern to which the coexistence frame pattern belongs .
  • FIG. 7 to FIG. 12 illustrate examples of frame patterns agreed between the base station and the mobile station when the mobile station is converted to a coexistence mode.
  • the mobile station can smoothly perform communication with the IEEE 802.16m system and other systems (for example, Bluetooth and Wi-Fi) of a neighboring band in accordance with the frame patterns.
  • Bluetooth and Wi-Fi systems
  • FIG. 7 is a diagram illustrating an example of a frame allocation mode for Bluetooth in the IEEE 802.16m system in case of Bluetooth esco single slot of Tesco 6.
  • Bluetooth packet transmission is performed simultaneously whenever IEEE 802.16m frame starts.
  • a frame pattern for Bluetooth transmission of one time per frame is suggested at 802.16m-BT Timing Sharing part 710 of IEEE 802.16m and Bluetooth.
  • This frame pattern is repeated per three frames of IEEE 802.16m, and allocates a frame for Bluetooth at a period of three IEEE 802.16m subframes .
  • This pattern can ensure successful transmission/reception of Bluetooth even in case of Tesco 12, 16.
  • FIG. 8 is a diagram illustrating an example of a frame allocation mode for Bluetooth in the IEEE 802.16m system in case of a Bluetooth esco single slot with Tesco 6 and Wesco 4.
  • the base station always starts Bluetooth packet transmission after 0.617ms (DL subframe size) after the mobile station requests a coexistence mode for Bluetooth transmission. It is also assumed that MAP information is allocated to every fourth DL subframe. Accordingly, when the mobile station requests the coexistence mode, since the base station allocates MAP per fourth subframe, the mobile station reads MAP from the fourth downlink subframe and senses that a frame for IEEE 802.16m communication has been allocated.
  • a pattern period of a frame pattern starts per frame.
  • first Bluetooth transmission/reception is failed, retransmission is tried from Wesco window.
  • the frame pattern of FIG. 8 ensures successful Bluetooth transmission of one time within the Tesco window by ensuring a retransmission opportunity.
  • Bluetooth offset is 617us, exactly, every fourth Bluetooth transmission 820 may be failed in case of Tesco 6. This drawback may be solved by readjusting Bluetooth offset or Tesco.
  • FIG. 9 is a diagram illustrating another example of a frame allocation mode for Bluetooth in the IEEE 802.16m system in case of a Bluetooth esco single slot with Tesco 6 and Wesco 4. It is assumed that the IEEE 802.16m frame has a super frame structure. In order to acquire system information transferred to a super frame header, first and second downlink subframes of every 20ms super frame are allocated to an IEEE 802.16m interval and include MAP information. For next frames, MAP information is allocated to every fourth DL subframe in the same manner as FIG. 8. It is assumed that Bluetooth packet offset (Desco) is 1.234us and has the same length as that of two downlink subframes.
  • Desco Bluetooth packet offset
  • a pattern period of a frame pattern starts per frame.
  • first Bluetooth transmission/reception is failed, retransmission is tried from Wesco window.
  • the frame pattern of FIG. 9 ensures successful Bluetooth transmission of one time within the Tesco window by ensuring a retransmission opportunity.
  • fourth Bluetooth transmission 920 may be failed. This drawback may be solved by readjusting Bluetooth offset or Tesco.
  • FIG. 10 is a diagram illustrating still another example of a frame allocation mode for Bluetooth in the IEEE 802.16m system in case of a Bluetooth esco single slot with Tesco 6 and Wesco 4.
  • FIG. 10 In a pattern 1010 illustrated in FIG. 10, three middle subframe intervals including TTG within every frame are allocated to a Bluetooth interval. Three downlink (DL) subframes and two uplink (UL) subframes are allocated for IEEE 802.16m. Also, it is preferable that DL and UL intervals allocated for IEEE 802.16m are maintained at an interval two subframes or more so as to transfer ACK information of DL data within a corresponding frame. It is assumed that Bluetooth offset is 1.851us corresponding to a timing point when the third DL subframe ends. However, the pattern of FIG. 10 may fail to ensure successful Bluetooth packet transmission for all cases. A pattern period of a frame pattern has a simple structure that the pattern period starts per frame.
  • FIG. 11 is a diagram illustrating further still another example of a frame allocation mode for Bluetooth in the IEEE 802.16m system in case of a Bluetooth esco single slot with Tesco 6 and Wesco 4.
  • a pattern 1110 of FIG. 11 four middle subframe intervals including TTG within every frame are allocated to a Bluetooth interval.
  • Two downlink (DL) subframes and two uplink (UL) subframes are allocated for IEEE 802.16m.
  • DL and UL intervals allocated for IEEE 802.16m are maintained at an interval two subframes or more so as to transfer ACK information of DL data. It is assumed that Bluetooth offset is 1.234us corresponding to a timing point when the second DL subframe ends .
  • an IEEE 802.16m frame allocation interval is 9.872ms, which occupies 49.36% of all allocation intervals, and the other allocation intervals are allocated as a Bluetooth interval, wherein the IEEE 802.16m frame allocation interval corresponds to current Bluetooth offset (start point of the third subframe of every frame) .
  • Tesco 6, 12, 16
  • multiple slots for example, packet lengths of three time slots are allowed in case of Ev4 and Ev5 of esco packet type
  • first and second downlink subframes of every super frame are to receive IEEE 802.16m super frame header (SFH) .
  • FSH super frame header
  • FIG. 12 is a diagram illustrating Bluetooth packet transmission and IEEE 802.16m packet transmission, which are simultaneously performed in a downlink frame interval of IEEE 802.16m frame. Since serious interference occurs in an uplink frame interval, Bluetooth packet transmission and IEEE 802.16m packet transmission are selectively performed only in the uplink frame interval. If the method of FIG. 12 is applied to the patterns of FIG. 7 to FIG. 11, a downlink interval where transmission is prevented from being performed for coexistence can be used normally, and an uplink interval defined by each pattern cannot be used.
  • Bluetooth transmission may be limited for all uplink intervals. Also, like time sharing 2, 3 (1220, 1230), Bluetooth/IEEE 802.16m are simultaneously allowed in the downlink interval but Bluetooth transmission may selectively be allowed in the uplink.
  • the present invention relates to a method of enabling a mobile station having IEEE 802.16m wireless interface to perform communication with each system while minimizing interference due to Bluetooth or Wi-Fi.
  • the present invention can be applied to systems such as a mobile station and a base station.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un procédé permettant de réaliser une communication avec coexistence de systèmes à l'aide de l'allocation de trame. Un procédé permettant de réaliser une communication avec coexistence de systèmes comprend les étapes consistant à émettre des informations de motif de trame correspondant à un état de communication avec coexistence de systèmes entre une station mobile et une station de base au moyen d'un message de demande d'intervalle de coexistence ; à recevoir un indicateur de configuration de coexistence du motif de trame via l'en-tête d'une super trame après réception d'un message d'autorisation du motif de trame ; et à effectuer une communication hétérogène dans un intervalle de communication hétérogène correspondant au motif de trame. Selon les modes de réalisation de l'invention, dans une structure de trame IEEE 802.16m, la station mobile disposant de l'interface sans fil IEEE 802.16m peut effectuer une communication avec chaque système tout en minimisant les interférences provoquées par les systèmes Bluetooth ou Wi-Fi en utilisant un motif de trame pour l'allocation d'intervalle du système Bluetooth ou Wi-Fi, le système Bluetooth et le système Wi-Fi utilisant des plages de fréquence voisines.
PCT/KR2009/003645 2008-07-04 2009-07-03 Procédé permettant de réaliser une communication avec coexistence de systèmes à l'aide de l'allocation de trame WO2010002219A2 (fr)

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KR10-2008-0065113 2008-07-04

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