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WO2010095898A2 - Procédé de communication pour femtostation de base - Google Patents

Procédé de communication pour femtostation de base Download PDF

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Publication number
WO2010095898A2
WO2010095898A2 PCT/KR2010/001066 KR2010001066W WO2010095898A2 WO 2010095898 A2 WO2010095898 A2 WO 2010095898A2 KR 2010001066 W KR2010001066 W KR 2010001066W WO 2010095898 A2 WO2010095898 A2 WO 2010095898A2
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WO
WIPO (PCT)
Prior art keywords
base station
femto base
ams
macro base
frame structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/KR2010/001066
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English (en)
Korean (ko)
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WO2010095898A3 (fr
Inventor
이진
김용호
류기선
정인욱
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LG Electronics Inc
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LG Electronics Inc
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Publication date
Priority claimed from KR1020100015215A external-priority patent/KR20100095399A/ko
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of WO2010095898A2 publication Critical patent/WO2010095898A2/fr
Publication of WO2010095898A3 publication Critical patent/WO2010095898A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

Definitions

  • a mobile communication system including a macro base station, at least one femto base station, and at least one terminal, a communication method of a femto base station in consideration of a legacy terminal, and an additionally improved operation method of a terminal for a system.
  • a femto base station is a small version of a macro base station, which performs most of the functions of a macro base station, and is a type of base station that may be installed in an area covered by the macro base station or in a shaded area not covered by the macro base station.
  • a femto base station has a network configuration that operates independently and can be installed much more than a relay base station in the city or indoors.
  • FIG. 1 is a configuration diagram of a wireless communication system to which a femto base station is added.
  • a wireless communication system to which a femto base station is added includes a femto base station 110, a macro base station, a femto network gateway (FNG) 130, and an access service network.
  • service network hereinafter referred to as "ASN”
  • CSN connectivity service network
  • Macro base station means a general base station of a conventional wireless communication system.
  • the femto base station 110 operates directly as a macro base station by directly connecting to a transmission control protocol / internet protocol (TCP / IP) network and has a coverage of about 0.1 to 30 m, and can be accommodated by one femto base station 110. It is assumed that there are about 10 to 20 terminals.
  • the femto base station 110 may use the same frequency as the macro base station (in the case of intra FA), or may use another frequency (in the case of Inter FA).
  • the femto base station 110 may be connected to the macro base station through an R1 interface to receive a downlink channel of the macro base station, and the femto base station 110 may transmit a control signal to the macro base station.
  • the femto base station 110 may cover an indoor or shadowed area that the macro base station does not cover and may support high data transmission.
  • the femto base station 110 may be installed in an overlay form in the macro cell, or may be installed in a non-overlay form in an area not covered by the macro base station.
  • Femto base station 110 is classified into two types.
  • the first type is a closed subscriber group (CSG) femto base station
  • the second type is an open subscriber group (OSG) femto base station.
  • the CSG femto base station may group the terminals accessible to it to grant a CSG ID (identification), and may discriminate when the terminal that has been granted the CSG ID and the terminal that do not access the CSG femtocell base station.
  • the OSG femtocell base station is a base station to which all terminals can access.
  • the FNG 130 is a gateway controlling the femto base station 110 and may be connected to the ASN 140 and the CSN 150 through the Rx interface and the Ry interface.
  • the femto base station 110 may receive a service from the CSN 150 through the FNG 230, and the terminal connected to the femto base station 110 may provide functions such as authentication and IMS to the FNG 130 or the CSN 150. You can get the service from.
  • the CSN 150 provides a terminal with a connection of application services such as the Internet and VoIP, and provides authentication and billing functions.
  • the ASN 140 can control the macro base station and manage the connection between the macro base station and the CSN 150. have.
  • the femto base station as described above is proposed to be introduced in the IEEE 802.16m (hereinafter referred to as 16m) system which is currently being standardized as an improvement model of the IEEE 802.16e (hereinafter referred to as 16e) system.
  • 16m IEEE 802.16m
  • 16e IEEE 802.16e
  • the 16m system stipulates to selectively support legacy systems, that is, terminals according to the 16e system, for backward compatibility.
  • a legacy terminal YMS
  • YMS legacy terminal
  • a 16m femto base station uses the same frame structure as a macro base station supporting only a 16m system
  • a network entry may be performed with a 16m femto base station. It may cause serious interference to legacy legacy terminals.
  • the femto base station when the femto base station communicates with the terminal / macro base station, considering the legacy terminal, the femto base station sets the femto base station to use the frame structure in which the legacy terminal can recognize the femto base station. Techniques for enabling over / interference adjustment will be described.
  • a macro base station for solving the above problems, a macro base station, a femto base station, a terminal for a legacy system (hereinafter referred to as YMS) and a terminal for an improvement system (hereinafter referred to as AMS) in which a specific function is added to the legacy system.
  • YMS a terminal for a legacy system
  • AMS an improvement system
  • the femto base station to communicate with at least one of the macro base station, the YMS and the AMS in a mobile communication system comprising: a wireless having a first type frame structure without being connected to the YMS And communicating with at least one of the macro base station and the AMS using a frame, wherein the first type frame structure comprises: a first section corresponding to an initial predetermined symbol section of a specific radio frame; Only the preamble, the frame control header (FCH) and the DL-MAP are transmitted as system information, and the specific wireless program is transmitted.
  • FCH frame control header
  • the first interval is located in the first predetermined symbol interval of the first subframe of the specific radio frame, and the femto base station punctures the symbol interval after the first predetermined symbol interval in the first subframe.
  • the second period may be located from the second subframe of the specific radio frame.
  • the DL-MAP transmitted as the information for the legacy system includes a base station ID corresponding to the femto base station, and when the YMS receives a radio frame having the first type frame structure, the information as the legacy system information.
  • a base station ID corresponding to the femto base station may be obtained through the transmitted DL-MAP.
  • the radio frame having the first type frame structure does not include the UL-MAP and the ranging region for the legacy system, when the YMS receives the radio frame having the first type frame structure, the femto base station May not try to enter the network.
  • the present embodiment includes the steps of receiving from the macro base station a message instructing to perform communication using a radio frame having a second type frame structure; And communicating with at least one of the macro base station and the AMS and the YMS using a radio frame having the second type frame structure, wherein the second type frame structure And a downlink region for the legacy system, a downlink region for the enhancement system, an uplink region for the legacy system, and an uplink region for the enhancement system in a specific radio frame.
  • the femto base station may be a closed subscriber group (CSG) femto base station
  • the YMS may be a member terminal of the CSG femto base station.
  • the present embodiment includes receiving an interference mitigation command from the macro base station; And in accordance with the interference coordination command, suspending the use of a particular resource region.
  • a mobile communication including a macro base station, a femto base station, a terminal for a legacy system (hereinafter referred to as YMS), and a terminal for an enhancement system (hereinafter referred to as AMS) in which a specific function is added to the legacy system.
  • YMS a terminal for a legacy system
  • AMS an enhancement system
  • a method in which the AMS communicates with at least one of the macro base station and the femto base station in a system comprising: operating in a first mode for communicating with the macro base station using the resource area for the legacy system; When the femto base station receives interference due to a signal transmitted using a radio frame having a first type frame structure, switching a mode to a second mode in which communication is performed using the resource region for the enhancement system; And performing a handover to the femto base station, wherein the first type frame structure includes a preamble and an FCH as information for the legacy system through a first section corresponding to an initial predetermined symbol section of a specific radio frame.
  • the AMS proposes a communication method of the AMS that acquires information on the femto base station by using the preamble transmitted as information for the legacy system, the FCH, and the DL-MAP.
  • the present embodiment includes reporting scan information about neighboring base stations to the macro base station using the information on the femto base station; And receiving a handover command from the macro base station.
  • the method may further include performing a terminal-initiated handover to the femto base station by using the information on the femto base station.
  • a mobile communication including a macro base station, a femto base station, a terminal for a legacy system (hereinafter referred to as YMS), and a terminal for an enhancement system (hereinafter referred to as AMS) in which a specific function is added to the legacy system.
  • YMS a terminal for a legacy system
  • AMS an enhancement system
  • a femto base station apparatus for communicating with at least one of the YMS and the AMS in a system comprising: a processor including the legacy system MAC module and the enhancement system MAC module; And an RF unit, wherein the processor is configured to communicate with at least one of the macro base station and the AMS using a radio frame having a first type frame structure without being connected to the YMS through the RF unit.
  • the first type frame structure is configured to transmit only a preamble, a frame control header (FCH), and a DL-MAP as information for the legacy system through a first period corresponding to an initial predetermined symbol period of a specific radio frame.
  • a femto base station apparatus configured to transmit a signal for communicating with at least one of the macro base station and the AMS through a second section following the predetermined symbol section in the specific radio frame.
  • the DL-MAP transmitted as the information for the legacy system includes a base station ID corresponding to the femto base station, and when the YMS receives a radio frame having the first type frame structure, the information as the legacy system information.
  • a base station ID corresponding to the femto base station may be obtained through the transmitted DL-MAP.
  • the radio frame having the first type frame structure does not include the UL-MAP and the ranging region for the legacy system, when the YMS receives the radio frame having the first type frame structure, the femto base station May not try to enter the network.
  • the processor when receiving a message instructing to perform communication using a radio frame having a second type frame structure from the macro base station through the RF unit, receives the second type frame structure through the RF unit.
  • a radio frame having a may be controlled to communicate with at least one of the macro base station and the AMS, and also the YMS, wherein the second type frame structure, the downlink for the legacy system in a specific radio frame And a link region, a downlink region for the enhancement system, an uplink region for the legacy system, and an uplink region for the enhancement system.
  • the femto base station may be a closed subscriber group (CSG) femto base station
  • the YMS may be a member terminal of the CSG femto base station.
  • the processor may suspend the use of a specific resource region according to the interference mitigation instruction.
  • a mobile station includes a macro base station, a femto base station, a terminal for a legacy system (hereinafter referred to as YMS), and a terminal for an improved system (hereinafter referred to as AMS) to which a specific function is added to the legacy system.
  • An AMS apparatus for communicating with at least one of the macro base station and the femto base station in a communication system comprising: a processor including the legacy system MAC module and the enhancement system MAC module; And an RF unit, wherein the processor is configured to control the macro base station to operate in a first mode for performing communication using the macro base station and the legacy system resource area through the MAC module for the legacy system.
  • the mode is switched to a second mode in which communication is performed using the resource region for the enhancement system using the MAC module for the enhancement system. And performing a handover to the femto base station, wherein the first type frame structure includes a preamble and an FCH (information) for the legacy system through a first section corresponding to an initial predetermined symbol section of a specific radio frame.
  • the first type frame structure includes a preamble and an FCH (information) for the legacy system through a first section corresponding to an initial predetermined symbol section of a specific radio frame.
  • the predetermined symbol in the specific radio frame Is configured to transmit a signal for communicating with at least one of the macro base station and the AMS through a subsequent second interval, wherein the processor is transmitted as information for the legacy system and received by the RF unit;
  • An AMS device for acquiring information about the femto base station using the FCH and the DL-MAP is proposed.
  • the processor may be configured to report scan information about neighboring base stations to the macro base station through the RF unit and to receive a handover command from the macro base station using the information on the femto base station.
  • the processor may control to perform a terminal-initiated handover to the femto base station by using the information on the femto base station.
  • a terminal using a legacy terminal and / or a legacy system resource region may recognize a femto base station and perform a procedure such as handover / interference coordination to a femto base station, and the femto base station may also be a resource. Can be used efficiently.
  • FIG. 1 is a configuration diagram of a wireless communication system to which a femto base station is added.
  • FIG. 3 illustrates a frame structure used by a legacy support macro base station.
  • FIG. 4 and 5 illustrate a frame structure that can be used by the femto base station according to an embodiment of the present invention.
  • FIG. 6 is a view for explaining a first embodiment of the present invention.
  • FIG. 7 is a view for explaining a second embodiment of the present invention.
  • FIG. 8 is a view for explaining a third embodiment of the present invention.
  • FIG 9 is a view for explaining a fourth embodiment of the present invention.
  • FIG. 10 is a view for explaining a fifth embodiment of the present invention.
  • FIG. 11 is a diagram for briefly describing an apparatus configuration of a terminal, a femto base station, and a macro base station according to embodiments of the present invention.
  • the base station and the terminal according to the IEEE 802.16m system can be improved from a legacy system, for example, a mobile station (hereinafter referred to as YMS) and a base station (hereinafter referred to as YBS) according to the IEEE 802.16e system.
  • YMS mobile station
  • YBS base station
  • ABS Advanced BS
  • AMS Advanced MS
  • a legacy system will be described as an IEEE 802.16e system
  • an improved system will be described as an IEEE 802.16m system.
  • the present invention is not limited thereto. In a situation where two systems coexist, such as an additionally improved system, a legacy system, an improved system, may be defined to distinguish between the two systems.
  • the following describes in detail the method for the femto base station to perform communication in consideration of the legacy terminal.
  • the legacy terminal recognizes the base station (macro base station), and looks at the 16e frame structure to specify the mechanism for performing the communication.
  • the 16e frame starts with a preamble (OFDMA symbol k) for synchronization in the physical layer and cell ID discovery (OFDMA symbol k), and then used for the length of the DL-MAP message and the DL-MAP message.
  • a DL-MAP for allocating resources for a downlink data burst and a frame control header (FCH) including information on the repeated coding scheme (OFDMA symbol k + 1).
  • downlink bursts may be included in OFDMA symbols k + 3 to k + 15, and the first downlink burst may include UL-MAP.
  • the 16e frame may include a ranging subchannel and uplink bursts through a transmit / receive transition gap (TGT) for transmitting and receiving switching.
  • TGT transmit / receive transition gap
  • the legacy terminal synchronizes with the base station (macro base station) through the preamble of the frame structure of FIG. 2, obtains a cell ID, obtains information for receiving DL-MAP through FCH, and uses data using DL-MAP. Burst resource allocation information can be obtained.
  • AMS legacy support base station
  • AMS mixed mode base station
  • FIG. 3 illustrates a frame structure used by a legacy support macro base station.
  • the frame structure (5 ms) used by the legacy support macro base station may sequentially include a 16e downlink section, a 16m downlink section, a 16e uplink section, and a 16m uplink section in one radio frame.
  • the 16e preamble may be transmitted to the start position of the 16e downlink period
  • the 16m preamble may be transmitted to the start position of the 16m downlink period.
  • the 16m preamble may be referred to as an advanced preamble or an A-Preamble to distinguish it from the preamble for the 16e system.
  • a switching point for switching transmission and reception may exist between the 16m downlink period and the 16e uplink period.
  • the legacy support macro base station can support not only AMS but also YMS.
  • 16e zone Refers to a resource zone that supports communication according to the 16e system in the frame structure shown in FIG. 3.
  • 16m region Refers to a resource region supporting communication according to the 16m system in the frame structure as shown in FIG.
  • L mode Refers to a mode in which AMS or ABS operates in the 16e region.
  • M mode Refers to a mode in which AMS or ABS operate in a 16m region.
  • the femto ABS operates in the 16m region and transmits the 16e preamble, the FCH, and the 16e general DL-MAP through the 16e region. This will be described later in detail with reference to FIGS. 4 and 5.
  • the femto ABS refers to operating in both the L mode and the M mode, like the legacy ABS.
  • the femto base station proposes to solve the problem of the legacy terminal not recognizing the femto base station by using the same frame structure used by the legacy support macro base station as shown in FIG. 3. That is, in the above definition, the femto base station proposes to operate in the L and M modes.
  • the femto ABS supports YMS and at least one or more YMSs are connected to the femto ABS, it is assumed that the femto ABS uses the same structure as the frame structure used by the legacy support macro ABS as shown in FIG. 3.
  • femto ABS has various types as follows. First, the femto ABS can be divided into CSG femto ABS and OSG femto ABS as described above. In addition, even in the CSG femto ABS can be divided into two types according to the accessibility of the non-member terminal, that is, the terminal that is not given the CSG ID.
  • CSG Closed Femto ABS is a type that allows access only to member terminals.
  • the terminal may store the CSG closed femto base station identifiers allowed for access thereof in a white list.
  • the CSG open femto base station (CSG-Open Femto ABS) preferentially supports the service to the member terminals, and the type of allowing access to non-member terminals if there is sufficient resources.
  • service levels for non-member terminals may be differentiated as compared to member terminals.
  • the classification of the CSG open / closed femto base station can be known through partition information in an AAI_SCD (Advanced Air Interface System Configuration Descriptor) message.
  • AAI_SCD Advanced Air Interface System Configuration Descriptor
  • legacy terminals that do not have a white list, ie, a femto ABS list to which the AMS is allowed to access, may attempt to access a femto ABS that is not accessible, thereby causing unnecessary uplink signaling.
  • the femto ABS using the frame structure as shown in FIG. 3 can operate in both the L mode and the M mode, such as the ABS operating in the mixed mode.
  • the legacy terminal since the 16e preamble, the FCH, and the DL-MAP are transmitted as in the mixed mode macro ABS, the legacy terminal can discover the femto ABS. Therefore, even though the legacy terminal is not allowed to access the femto ABS, the legacy terminal may request interference mitigation from the macro ABS as follows.
  • non-member CSG terminals connected to the macro base station may feel interference from neighboring femto base stations. Accordingly, when the terminal can recognize the corresponding femto base station, scanning can be performed to report the scanning result to the macro base station.
  • the macro base station may check the scanning result and select the femto base stations having a high degree of interference, and block or reserve resources of a predetermined area to the femto base stations so that the terminal does not feel interference.
  • the legacy terminal may also recognize the femto base station through the 16e preamble, FCH, DL-MAP, and request interference coordination from the macro base station. .
  • another embodiment of the present invention proposes another frame structure that can be used by the femto base station in consideration of the legacy terminal.
  • FIG. 4 and 5 illustrate a frame structure that can be used by the femto base station according to an embodiment of the present invention.
  • FIG. 4 is an enlarged view of one radio frame of 5 ms in length
  • FIG. 5 is a diagram continuously showing a radio frame of 5 ms in length.
  • the frame structure according to the present embodiment proposes to transmit 16e preamble, FCH and DL-MAP in a predetermined OFDMA symbol period from the start position of every frame as shown in FIGS. 4 and 5.
  • the 16e preamble transmitted as described above may allow the legacy terminal to discover the femto ABS.
  • the base station ID (BS ID) cannot be directly detected by discovering the preamble from the legacy terminal point of view, and only the cell ID is found through the preamble.
  • the 16e FCH includes a DL frame prefix and may inform the DL-MAP message length and the repetition code used for the DL-MAP message.
  • the FCH may have a format as shown in Table 1 below.
  • the legacy terminal may not discover the BS ID through the 16e preamble, and the BS ID may be obtained through the DL-MAP message.
  • the femto base station according to the present embodiment forms a 16e general DL-MAP message instead of the compact DL-MAP for transmitting a short BS ID. It is proposed to transmit a DL-MAP message.
  • the 16e DL-MAP message format transmitted by the femto base station according to the present embodiment may be represented as shown in Table 2 below.
  • the legacy terminal When the legacy terminal recognizes the femto base station according to the present embodiment, when the legacy terminal reports the femto base station ID to the macro base station, the legacy terminal also transmits the entire BS ID. Reporting the detected femto BS through MOB_SCN-REP may be triggered based on a predetermined reporting condition.
  • all other subframes can be used in the 16m region except for symbols used by the femto base station to transmit 16e preamble, FCH and DL-MAP according to the present embodiment. have. Referring to FIG. 4, except for symbols used to transmit 16e signals (preamble, FCH, DL-MAP) in the first subframe, the remaining symbols are punctured and subframes 2 to 8 are all 16m regions. It is shown using. As described above, the use of subframe 1 for the 16e signal transmission and the puncturing of the rest part is performed by performing resource allocation in subframe units when allocating resources in the physical layer. However, if necessary, the remaining symbols may also be used as the 16m region except for the symbols used for the 16e signal transmission in the subframe 1. As shown in FIG. 4, the first subframe may consist of 5 or 6 OFDMA symbols. In addition, one or more symbols may be used for DL-MAP transmission.
  • the frame structure according to the present embodiment proposes that the legacy terminal is not connected and is configured such that the legacy terminal does not attempt an uplink connection. Accordingly, as compared with the embodiment shown in FIG. 3, as shown in FIG. 5, the 16e UL-MAP is not transmitted, and a ranging region is not allocated, so the legacy terminal (non-member MS) is corresponding. You cannot enter the network with Femto ABS. That is, in this embodiment, although femto ABS supports YMS, if there is no YMS currently connected to the femto ABS, it is proposed to use the frame structure as shown in FIGS. 4 and 5.
  • an extended 16m zone can be obtained as compared to the frame structure shown in FIG. 3.
  • the femto ABS can perform 16m communication more efficiently in a state in which the femto ABS is not connected to the YMS.
  • the frame structure shown in FIGS. 4 and 5 (hereinafter also referred to as 'first frame structure') has the following advantages and disadvantages compared to the frame structure shown in FIG. 3 (hereinafter also referred to as 'second frame structure').
  • an extended M area may be obtained by using the L area more efficiently than the second frame structure.
  • it has the advantage of preventing unnecessary connection signaling of the non-CSG member YMS.
  • the legacy terminal recognizes the femto base station as described above. It may be more efficient to only make it possible and to have the legacy terminal request interference coordination from the macro base station when interference is a problem.
  • the first frame structure it is not appropriate to use when more than one YMS is connected. That is, the first frame structure is suitable for use when the YMS is not connected.
  • FIG. 6 is a view for explaining a first embodiment of the present invention.
  • a legacy terminal is a member of a legacy support femto BS, which is a CSG femto base station, and is currently connected to a macro ABS.
  • the macro base station and the CSG femto base station are located in the same frequency band, causing interference to the YMS.
  • Step 1 If the femto ABS supports the legacy terminal but there is no legacy terminal currently connected to the corresponding femto base station, the femto base station uses the first frame structure described above as 16e information as 16e preamble, FCH, general Only DL-MAP will be transmitted.
  • Step 2 The legacy terminal may perform channel measurement through the 16e preamble transmitted by the femto base station and may discover the entire BS ID of the femto base station through the 16e general DL-MAP message read using the FCH information.
  • the MAC module of the legacy terminal processor discovers the entire BS ID of the femto base station, it may not be able to distinguish whether or not the femto base station is accessible. This is because in the legacy terminal, the white list may be managed by an upper layer existing above the MAC layer.
  • Step 3 If the CINR level of the macro base station is below a predetermined threshold or the channel quality measured from the femto base station is greater than or equal to the predetermined threshold, the legacy terminal may transmit the channel measurement result to the macro base station through a scanning report.
  • the above described scanning report triggering conditions are exemplary, and various triggering conditions may exist according to a system. If the macro base station determines that it can connect to the femto base station reported by the YMS to receive and determine the scanning report received from the YMS, the following process can be performed.
  • Step 4 The macro base station may transmit a mode change request (CHANGE_MODE-REQ) message to the femto base station via a backbone.
  • This mode conversion request is a message for requesting the corresponding femto base station to switch from the mode using the first frame structure (M mode) to the mode using the second frame structure (L, M mode).
  • Step 5 The femto base station receiving the mode conversion request message from the macro base station may perform mode conversion from the mode using the first frame structure (M mode) to the mode using the second frame structure (L, M mode).
  • Step 6 The femto base station which has performed the mode conversion may transmit a mode change response (CHANGE_MODE-RSP) message to the macro base station as a response to the mode change request message (CHANGE_MODE-REQ) of the macro base station.
  • CHANGE_MODE-RSP mode change response
  • CHANGE_MODE-REQ mode change request message
  • Step 7 The macro base station may transmit a handover command message to the legacy terminal to handover to the femto base station.
  • FIG. 6 illustrates an example in which the macro base station delivers a fast ranging IE to a legacy terminal to avoid contention based ranging.
  • Step 8 Accordingly, the legacy terminal may request a handover by performing a ranging procedure with the legacy support femto base station.
  • FIG. 7 is a view for explaining a second embodiment of the present invention.
  • the legacy terminal is a non-member terminal of the CSG femto base station and is currently connected to the macro base station. Also assume that the YMS is receiving interference from the femto base station.
  • Step 1 If the femto ABS supports the legacy terminal but no legacy terminal is currently connected to the corresponding femto base station, the femto base station uses the above-described first frame structure as a 16e signal as a preamble, FCH and general DL. Assume to send only MAP.
  • Step 2 The legacy terminal may perform channel measurement through the 16e preamble transmitted by the femto base station and may discover the entire BS ID of the femto base station through the 16e general DL-MAP message read using the FCH information.
  • the MAC module of the legacy terminal processor discovers the entire BS ID of the femto base station, it may not be able to distinguish whether or not the femto base station is accessible. This is because in the legacy terminal, the white list may be managed by an upper layer existing above the MAC layer.
  • Step 3 If the CINR level of the macro base station is below a predetermined threshold or if the channel quality measured from the femto base station is greater than or equal to the predetermined threshold, the legacy terminal may transmit the channel measurement result to the macro base station through a scanning report.
  • the above described scanning report triggering conditions are exemplary, and various triggering conditions may exist according to a system. Since it is assumed that the YMS is a non-CSG member in the present embodiment, the macro base station may determine that the YMS cannot access the corresponding femto base station, and may perform the following process.
  • Step 4 The macro base station may request a resource reservation to the corresponding femto base station through the backbone.
  • the macro base station may use the MAC message or may use the reserved ranging code.
  • the macro base station transmits an RSC_RSV-REQ message to the femto base station.
  • Step 5 The femto base station that has successfully received the resource reservation request message from the macro base station may perform resource reservation. Accordingly, the YMS can solve the interference problem caused by the femto base station.
  • Step 6 The femto base station performs a successful resource reservation and may transmit a response message (RSC_RSV-RSP) to the macro base station in response to the RSC_RSV-REQ message of the macro base station.
  • RSC_RSV-RSP response message
  • Step 7 In the present embodiment, additionally, the YMS periodically performs channel measurement, and the legacy terminal is satisfied when the triggering condition to send a channel measurement result scanning report is satisfied while the femto base station is no longer found and the femto base station is no longer found. It is proposed to transmit this scanning result to the macro base station. The macro base station that has received this may inform the femto base station to cancel the reservation of reserved resources.
  • the interference coordination may be requested by signaling the femto base station directly.
  • the femto base station is a femto base station supporting only 16m that can not operate in the L, M mode
  • the terminal is AMS rather than YMS. That is, it is assumed that the AMS is a terminal having both a 16e MAC module and a 16m MAC module in the processor, and the macro base station and the femto base station have the same environment. In addition, it is assumed that a specific upper layer module corresponding to a higher layer than the MAC layer in the processor of the AMS and the macro ABS can control switching between the 16e interface and the 16m interface.
  • FIG. 8 is a view for explaining a third embodiment of the present invention.
  • the AMS is operating in the macro ABS and the L mode as shown in FIG. 8.
  • the AMS operates in the macro ABS and the L mode, which is an exceptional case and may be performed for cell load distribution.
  • Step 1 Meanwhile, it is assumed that the femto ABS transmits only the preamble, the FCH, and the general DL-MAP as 16e system information according to the first frame structure described above.
  • Step 2 the AMS may perform channel measurement from the 16e preamble transmitted by the femto base station, and acquire the BS ID of the femto base station through the FCH information and the general DL-MAP information.
  • Step 3 If the channel measurement result of the AMS is a CINR value from the macro base station is lower than the predetermined threshold, and the channel measurement result with the femto base station is higher than the predetermined threshold, the AMS sends MOB_SCN-REP to the macro base station, the channel measurement result May be reported to the macro base station. Accordingly, the macro base station may find that the AMS operating in the L mode may hand over to the femto ABS.
  • Step 4 The macro ABS may transmit a MAC message including a zone switch TLV (ALV) to the AMS to instruct the AMS to handover to the femto base station so that the AMS may change the interface.
  • ALV zone switch TLV
  • Step 5 The AMS may perform a mode change from the L mode to the M mode by using the area switching TLV received in step 4.
  • Step 6 The 16m interface of the AMS may perform network entry to the femto base station using the 16m MAC message.
  • FIG 9 is a view for explaining a fourth embodiment of the present invention.
  • the fourth embodiment is similar to the third embodiment, but differs from the third embodiment in that the macro base station uses a 16m MAC message instead of a 16e MAC message.
  • the AMS is operating in the macro ABS and the L mode as shown in FIG. 9.
  • the AMS operates in the macro ABS and the L mode, which is an exceptional case and may be performed for cell load distribution.
  • Step 1 It is assumed that the femto ABS transmits only the preamble, the FCH, and the general DL-MAP as 16e system information according to the first frame structure described above.
  • Step 2 the AMS may perform channel measurement from the 16e preamble transmitted by the femto base station, and acquire the BS ID of the femto base station through the FCH information and the general DL-MAP information.
  • Step 3 If the channel measurement result of the AMS is a CINR value from the macro base station is lower than the predetermined threshold, and the channel measurement result with the femto base station is higher than the predetermined threshold, the AMS sends MOB_SCN-REP to the macro base station, the channel measurement result May be reported to the macro base station. Accordingly, the macro base station may find that the AMS operating in the L mode may hand over to the femto ABS.
  • Step 4 If the macro base station determines that the AMS can hand over to the femto base station, the macro base station itself may change the interface from L mode to M mode.
  • Step 5 In addition, the area switching TLV may be transmitted to the AMS through the 16e signal. Step 5 may be preferably performed before step 4 as shown in FIG. 9.
  • Step 6 The AMS may switch from L mode to M mode by performing mode switching according to the area switching TLV received from the macro base station.
  • Step 7 The M interface of the macro base station may command a handover to the AMS through a 16m message (eg, AAI_HO-CMD).
  • a 16m message eg, AAI_HO-CMD
  • Step 8 The 16m interface of the AMS may perform network entry directly to the femto base station using the 16m MAC message.
  • FIG. 10 is a view for explaining a fifth embodiment of the present invention.
  • the fifth embodiment is similar to the third embodiment, but differs from the third embodiment in that handover is initiated by the terminal.
  • the AMS is operating in the macro ABS and the L mode as shown in FIG. 10.
  • the AMS operates in the macro ABS and the L mode, which is an exceptional case and may be performed for cell load distribution.
  • Step 1 It is assumed that the femto ABS transmits only the preamble, the FCH, and the general DL-MAP as 16e system information according to the first frame structure described above.
  • Step 2 the AMS may perform channel measurement from the 16e preamble transmitted by the femto base station, and acquire the BS ID of the femto base station through the FCH information and the general DL-MAP information.
  • Step 3 The AMS may request a handover to the femto base station found to the macro base station via the 16e signal.
  • the MAC module of the AMS may not recognize the type of the base station as a femto, but may assume a macro base station and request a handover.
  • Step 4 The macro base station may send an area switching TLV together in a handover response (HO-RSP) message to allow the AMS to perform mode switching in order for the AMS to perform handover in M mode.
  • HO-RSP handover response
  • Step 5 After receiving the area switching TLV from the macro base station, the AMS may perform mode switching to convert to M mode.
  • Step 6 The 16m interface of the AMS may perform network entry directly to the femto base station using the 16m MAC message.
  • each embodiment of the present invention can be used in various combinations. Accordingly, while the legacy terminal could not find the 16m femto base station, the interference generated from the femto base station installed in the same frequency domain as the macro base station could not be solved, but the interference adjustment or handover to the femto base station was performed using the present embodiments. Can be done.
  • the femto base station can be easily found to perform handover / interference coordination.
  • FIG. 11 is a diagram for briefly describing an apparatus configuration of a terminal, a femto base station, and a macro base station according to embodiments of the present invention.
  • the apparatus 50 shown in FIG. 11 may be a terminal (AMS or YMS), a femto base station, or a macro base station described in the above embodiments.
  • the apparatus 50 includes a processor 51, a memory 52, a radio frequency unit (RF unit) 53, a display unit 54, and a user interface unit 55 as shown in FIG. 11. Layers of the air interface protocol are implemented in the processor 51.
  • the processor 51 provides a control plan and a user plan. The function of each layer may be implemented in the processor 51.
  • the processor 51 may include a contention resolution timer.
  • Memory 52 is coupled to processor 51 to store operating systems, applications, and general files.
  • the display unit 54 may display various information and use well-known elements such as a liquid crystal display (LCD) and an organic light emitting diode (OLED).
  • the user interface unit 55 may be composed of a combination of well known user interfaces such as a keypad, a touch screen, and the like.
  • the RF unit 53 may be connected to the processor 51 to transmit and receive a radio signal.
  • the RF unit 53 may be divided into a transmission module and a reception module.
  • the layers of the air interface protocol between the terminal, the femto base station, and the macro base station are based on the lower three layers of the open system interconnection (OSI) model, which is well known in a communication system. And the third layer L3.
  • the physical layer or the PHY layer belongs to the first layer and provides an information transmission service through a physical channel.
  • a radio resource control (RRC) layer belongs to the third layer and provides control radio resources between the terminal, the femto base station, and the macro base station.
  • the terminal and the network exchange RRC messages through the RRC layer.
  • the processor 51 of the apparatus 50 may control to use the above-described first type frame structure and the second type frame structure through the RF unit 53.
  • the processor 51 may be divided into a physical layer module (not shown), a MAC module (not shown), and a higher layer module (not shown).
  • the processor 51 may use a MAC module for legacy system / enhancement system, such as a 16e MAC module (not shown) and a 16m MAC module (not shown). It may include.
  • Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • the control information transmission and reception method according to an embodiment of the present invention is one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable (PLDs) logic devices), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • firmware or software may be implemented in the form of a module, procedure, function, etc. to perform the functions or operations described above.
  • the software code may be stored in a memory unit and driven by a processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • the above-described invention is suitable for application to an IEEE 802.16 series wireless communication system.
  • the same concept may be used and may be equally applied to various wireless communication systems.

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

Abstract

La présente invention concerne un procédé de communication pour une femtostation de base par rapport à un terminal existant, et une technique d'utilisation de terminaux fondée sur un système amélioré dans le procédé de communication. La femtostation de base communique au moyen d'une structure de trame qui comprend uniquement un préambule, FCH, et DL-MAP en tant qu'informations de système existant pour permettre au terminal existant de détecter la femtostation de base. La femtostation de base convertit également des modes pour utiliser une structure de trame dans laquelle une zone existante et une zone de système améliorée sont incluses de manière séquentielle afin de se connecter auprès du terminal existant. Ainsi, le terminal existant détecte la femtostation de base pour assurer un transfert/une surveillance de brouillages. Le terminal de système amélioré qui fonctionne en mode L détecte la femtostation de base pour assurer également un transfert/une surveillance de brouillages.
PCT/KR2010/001066 2009-02-20 2010-02-22 Procédé de communication pour femtostation de base Ceased WO2010095898A2 (fr)

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US15398309P 2009-02-20 2009-02-20
US61/153,983 2009-02-20
KR1020100015215A KR20100095399A (ko) 2009-02-20 2010-02-19 레거시 단말을 고려한 팸토 기지국의 통신 기법
KR10-2010-0015215 2010-02-19

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102595464A (zh) * 2011-01-07 2012-07-18 华为技术有限公司 测量的方法、基站和用户设备
WO2012130027A1 (fr) * 2011-03-31 2012-10-04 北京新岸线无线技术有限公司 Procédé et dispositif pour accéder à un réseau sans fil
CN102857927A (zh) * 2011-06-29 2013-01-02 华为技术有限公司 在无线通信系统中动态调整子帧的方法、基站以及系统
US9240974B2 (en) 2011-03-31 2016-01-19 Beijing Nufront Mobile Multimedia Technology Co., Ltd. Wireless communication method, sending device and receiving device
CN102595464B (zh) * 2011-01-07 2016-12-14 华为技术有限公司 测量的方法、基站和用户设备

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1764934B1 (fr) * 2005-09-15 2022-03-30 Huawei Technologies Co., Ltd. Méthode de génération de trame dans un système de communication à accès multiple par division de fréquences orthogonales
KR100615139B1 (ko) * 2005-10-18 2006-08-22 삼성전자주식회사 무선통신 시스템에서 전송 시간 구간의 할당 방법과 장치및 그 시스템

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102595464A (zh) * 2011-01-07 2012-07-18 华为技术有限公司 测量的方法、基站和用户设备
CN102595464B (zh) * 2011-01-07 2016-12-14 华为技术有限公司 测量的方法、基站和用户设备
WO2012130027A1 (fr) * 2011-03-31 2012-10-04 北京新岸线无线技术有限公司 Procédé et dispositif pour accéder à un réseau sans fil
US9240974B2 (en) 2011-03-31 2016-01-19 Beijing Nufront Mobile Multimedia Technology Co., Ltd. Wireless communication method, sending device and receiving device
US9391760B2 (en) 2011-03-31 2016-07-12 Beijing Nufront Mobile Multimedia Technology Co., Ltd Method and device for accessing wireless network
CN102857927A (zh) * 2011-06-29 2013-01-02 华为技术有限公司 在无线通信系统中动态调整子帧的方法、基站以及系统
WO2013000388A1 (fr) * 2011-06-29 2013-01-03 华为技术有限公司 Procédé pour ajuster de manière dynamique une sous-trame dans un système de communication sans fil, station de base et système

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