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WO2012148256A1 - Transfert intercellulaire en macro-diversité améliorée dans des réseaux à relais multi-bonds sans fil - Google Patents

Transfert intercellulaire en macro-diversité améliorée dans des réseaux à relais multi-bonds sans fil Download PDF

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Publication number
WO2012148256A1
WO2012148256A1 PCT/MY2012/000089 MY2012000089W WO2012148256A1 WO 2012148256 A1 WO2012148256 A1 WO 2012148256A1 MY 2012000089 W MY2012000089 W MY 2012000089W WO 2012148256 A1 WO2012148256 A1 WO 2012148256A1
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WO
WIPO (PCT)
Prior art keywords
mdho
hop relay
diversity
networks
during
Prior art date
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Ceased
Application number
PCT/MY2012/000089
Other languages
English (en)
Inventor
Mahamod ISMAIL
Jamil SULTAN
Kasmiran JUMARI
Norbahiah MISRAN
Hafizal Mohamad
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mimos Bhd
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Mimos Bhd
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Filing date
Publication date
Application filed by Mimos Bhd filed Critical Mimos Bhd
Publication of WO2012148256A1 publication Critical patent/WO2012148256A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/026—Multicasting of data during hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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
    • 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
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Definitions

  • the present invention relates generally to wireless cellular networks, more particularly a method for an improved macro diversity handover technique r multi-hop relay networks.
  • the present invention provides an efficient macro diversity handover (MDHO) technique for multi-hop wireless relay networks to overcome the above-mentioned drawbacks.
  • MDHO macro diversity handover
  • the MS received the signal transmitted by the MR-BS during the first phase in addition to the simultaneous transmissions of the MR-BS and RS occur during the second ' phase whenever the MR-BS and RS are included into the diversity set of the MS.
  • the present technique also performs similarly as the conventional MDHO whenever two RSs or two MR-BSs are the diversity set members of the MS.
  • the topology of the diversity set members is fully exploited. This will then increase the diversity gain and the received signal strength and decreases the BER, which are important in enhancing the performance of the MS in the handover regions.
  • a method for an improved macro diversity handover (MDHO) for multi-hop relay (MR) networks comprising the steps of maintaining a diversity set for each mobile station (MS) in the handover regions, in which each diversity set includes at least two different-topology access stations that can communicate with the associated mobile station (MS) , establishing the topology of the diversity set members, allocating resources to the diversity set members for both first and second phases, notifying the mobile station (MS) of the allocated resources, communicating between the diversity set members and MS during both first and second phases, and combining the signals received during the first and second phase from the diversity set members.
  • MDHO macro diversity handover
  • MR multi-hop relay
  • Figure la shows a schematic diagram of the improved DHO system of the present invention with the diversity set members are MR-BS1 and 2-hop RSI;
  • Figure 2 illustrates a schematic diagram of the MDHO scenarios in multi-hop relay networks of the present- invention
  • Figure 3 is a schematic diagram of a conventional MDHO with the diversity set members are MR-BS1 and RSI;
  • Figure 4 depicts a flowchart of a method for an improved macro diversity handover (MDHO) for multi-hop relay (MR) networks of the present invention. .
  • MDHO macro diversity handover
  • MR multi-hop relay
  • the macro diversity handover is the process in which the MS communicates simultaneously with at least two access stations as shown in Figure 1.
  • the access station can be a MR- BS or RS and this access stations list is called a diversity set and is maintained by the MS and MR—BS for each MS in the handover regions.
  • MDHO is accomplished by having at least two access stations receiving the same protocol data unit (PDU) from the MS such that the selection diversity of the received PDU is performed among the access stations.
  • PDU protocol data unit
  • MDHO is accomplished by having at least two access stations transmitting the same MAC/PHY PDU to the MS such that diversity combining can be performed.
  • the improved macro diversity handover (MDHO) system for multi-hop relay networks can be applied to two hop wireless relay networks in which the diversity set size is two and can easily be extended to the scenarios involving more than two hop relay stations and/or diversity set size of more than two.
  • Figure 1 shows an improved topology-aware MDHO (10) of the present invention in two scenarios, namely where the diversity set members are multi-hop relay base station (MR-BS1) (12) and two hop relay station (2 hop RSI) (13) shown in Figure la and where the diversity set members are multi-hop relay base station (MR— BS1) (12) and n-hop relay stations (n-hop RS) shown in Figure lb.
  • MR-BS1 multi-hop relay base station
  • 2 hop RSI hop relay station
  • n-hop relay stations n-hop relay stations
  • the mobile station (MS) (11) listens to both the transmission of the MR-BS1 (12) occurs during the first phase and the simultaneous transmissions of the MR ⁇ BSl (12) and RSI (13) occur during the second phase as shown in Figure la. While for n-hop relay networks, the transmission sequences during the n phases are shown in Figure lb. Therefore, the topology of the diversity set members is fully exploited and the performance of the MDHO is improved.
  • the general handover method performs network topology advertisement which is followed by allocating scanning intervals to the MSs.
  • the MDHO capability can be enabled or disabled in the REG-REQ/RSP message exchange. With MDHO enabled, the MS performs the stages which include the MDHO decision and initiation, diversity set selection or updates, anchor station selection or update and MDHO execution and termination .
  • the MR-BS and RS supporting MDHO shall broadcast downlink channel descriptor (DCD) message that includes the H_Add Threshold and H_Delete Threshold. These thresholds are used by the MDHO capable MS to determine if the MOB_MSHO-REQ message should be sent. If the long-term carrier to interference and noise ratio (CINR) of the neighbor MR-BS or RS is higher than H_ADD Threshold, then the MS sends the MOB_MSHO-REQ message to request adding this neighbor station to the diversity set. If the long-term CINR of the access MR-BS or RS, currently in the diversity set, is less than H_Delete Threshold, then the MS sends MOB_MSHO-REQ message to request dropping this access station from the diversity set.
  • CINR carrier to interference and noise ratio
  • the second case corresponds to the MDHO scenarios in which the diversity set members of the MS are two similar- topology access stations, for instance two RSs or two MR-BSs, and we named this as similar-topology case.
  • the two RSs in the diversity set are controlled by either the same MR-BS in case of intra cell MDHO as in scenario 3 as shown in Figure 2, or different MR-BRs in case of inter-cell MDHO as in scenario 4.
  • Simultaneous transmissions of the diversity set members during the second phase of the intra-cell MDHO scenarios increase the number of co-channel interference sources compared to the inter-cell MDHO scenarios or the scenarios in which either RS or MR-BS transmits in the interference-limited environment.
  • interference only comes from MR-BSs which might be lower than that for the second phase.
  • the average post processing CINR obtained at the MS after MRC can be derived as: where ' s .z and ⁇ denote the average CINR of the MR-BSl- MS link and RSI ->MS link, respectively.
  • both MR-BS1 (12) and RSI (13) transmit synchronously to the MS (11) by using the same radio resource.
  • the MS (11) combines the signals received during the first phase and second phase using MRC, for example.
  • Figure 4 shows a process flowchart of the improved MDHO of the present invention over the conventional MDHO.
  • the diversity set is first maintained or updated (21) by the MS and MR-BS for each MS in the handover regions as described previously.
  • the present system is mainly operated on MR-BSs and thus, all the MR-BSs and RSs should aware of their topology and all RSs directly or indirectly communicate with the MR-BSs that they are associated to. It should be noted that the indirect communication between RS and MR-BS is the communication through another RS in case of more than two-hop RS . Specific management signaling needs to be exchanged in order to allow the MR-BS to learn about the topology of its corresponding RSs.
  • topology setup are highly dependent upon the RS deployment scenarios, i.e. fixed relay, normadic relay or mobile relay.
  • the MR-BS can easily pre-set the topology information.
  • normadic relay on the other hand, the topology information setup should follow the location changes of the RSs.
  • mobile relay the MR-BS needs to update the topology information with the transmission.
  • the MR-BS After maintaining or updating the diversity set members (21) and obtaining or updating their related topology information (22) , the MR-BS allocates (23) the radio resources to the diversity set members and MS during the two phases accordingly so that the topology of the diversity set members is fully exploited.
  • the MR-BS is allocated with resources during both first and second phases while the RS is allocated with resources during the second phase only.
  • the resources allocated to both MR-BS and RS during second phase are identical.
  • the resource allocated to the MR-BS during first phase may be different from the resources allocated during the second phase with the same size. Therefore, the diversity set members use these allocated resources to communicate the same data with the MS (11) during both first and second phases.
  • orthogonal frequency division multiple access OFDMMA
  • OFDM symbols are allocated by time division multiple access (TDMA) method in the time domain, and the sub-carriers within OFDM symbols are divided by OFDMA method in the frequency domain into subsets of the sub-carriers, wherein each subset is called a sub-channel.
  • Each sub-channel may comprise the sub-carriers from a number of OFDM symbols. These sub-channels are the base resource allocation unit.
  • the subchannel may spread over the entire bandwidth to provide frequency diversity and average the inter-cell interference.
  • a zone is defined as a number of OFDMA symbols, in the UL or the DL, that use the same sub-channel definition, for instance, permutation.
  • the zone may be comprised of contiguous OFDM symbols.
  • the UL and DL sub-frame may contain more than one permutation zone.
  • a MDHO zone is defined for use in the handover area with same sub-channel permutation between all diversity set members.
  • the MR-BS uses DL-MAP information elements (IEs) defined for Macro_MIM0 operation to notify (24) the MS of the allocated resources during both first and second phases.
  • IEs DL-MAP information elements
  • Each MS can determine when, i.e OFDMA symbol and where, i.e. sub-channel, it should receive from the MR-BS during both first and second phase and when and where it should receive from the RS during the second phase based on a schedule received from the MR-BS.
  • the present invention is similar to the standard procedure for MDHO and multiple-input multiple-output (MIMO) which is denoted as Macro_MIMO operation.
  • the MR-BS uses the Macro_MIMO_DL_Basic_IE ( ) and MIMO_in_another_BS_IE ( ) information elements defined for Macro-MIMO operation to notify the MS of the allocated resources.
  • Macro_MIMO in the MDHO mode, a packet index is transmitted and all these regions with the same packet index shall be combined at the MS.
  • the MS demodulates signal in the same procedure as in non-MDHO mode if it does not receive MIMO_in_another_BS_IE ( ) or Macro_MIMO_DL_Basic_IE ( ) .
  • the same data are transmitted (25) from multiple access stations in the same data region.
  • MS may perform RF or diversity combining (26).
  • the MS received Macro_MIMO_DL__Basic_IE ( ) it demodulates the signal in the same procedure as in the non-MDHO mode and then it performs soft combining for those data regions with the same packet index. Therefore, this system benefits from combination of RF, diversity combining and soft data combining. As can be understood from the foregoing description, the present invention can be implemented without any requirements of modifications on MS (11).

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

Abstract

L'invention concerne un procédé d'amélioration du transfert intercellulaire en macro-diversité (MDHO, Macro Diversity HandOver) pour des réseaux de relais multi-bonds (MR, MultiHop Relay) comprenant les étapes consistant à maintenir (21) un ensemble de diversité pour chaque station mobile (MS) (11) dans des régions de transfert intercellulaire, à établir (22) la topologie des éléments de l'ensemble de diversité, à allouer (23) des ressources aux éléments de l'ensemble de diversité à la fois pour les première et seconde phases, à indiquer (24) à la station mobile la ressource allouée, à effectuer une communication (25) entre les éléments de l'ensemble de diversité et la station mobile à la fois pendant les première et seconde phases ; et à combiner (26) les signaux reçus pendant les première et seconde phases en provenance des éléments de l'ensemble de diversité.
PCT/MY2012/000089 2011-04-25 2012-04-25 Transfert intercellulaire en macro-diversité améliorée dans des réseaux à relais multi-bonds sans fil Ceased WO2012148256A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MYPI2011001838 2011-04-25
MYPI2011001838A MY164855A (en) 2011-04-25 2011-04-25 Improved macro diversity handover in wireless multi-hop relay networks

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103281111A (zh) * 2013-06-04 2013-09-04 哈尔滨工业大学 基于选择合并的解码转发协作系统的信号智能转发方法
WO2014085115A1 (fr) * 2012-11-29 2014-06-05 Corning Cable Systems Llc Liaison d'antennes d'unité distante intra-cellule/inter-cellule hybride dans des systèmes d'antenne distribués (das) à entrées multiples sorties multiples (mimo)
US9432095B2 (en) 2006-12-19 2016-08-30 Corning Optical Communications Wireless Ltd Distributed antenna system for MIMO technologies
US9525472B2 (en) 2014-07-30 2016-12-20 Corning Incorporated Reducing location-dependent destructive interference in distributed antenna systems (DASS) operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods
US9729267B2 (en) 2014-12-11 2017-08-08 Corning Optical Communications Wireless Ltd Multiplexing two separate optical links with the same wavelength using asymmetric combining and splitting
US9813127B2 (en) 2012-03-30 2017-11-07 Corning Optical Communications LLC Reducing location-dependent interference in distributed antenna systems operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SULTAN, J. ET AL.: "Topology-aware macro diversity handover technique for IEEE 802.16j multi-hop cellular networks", IET COMMUNICATIONS, vol. 5, no. ISS. 5, 25 March 2011 (2011-03-25), pages 700 - 708 *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9432095B2 (en) 2006-12-19 2016-08-30 Corning Optical Communications Wireless Ltd Distributed antenna system for MIMO technologies
US9461719B2 (en) 2006-12-19 2016-10-04 Corning Optical Communications Wirless Ltd Distributed antenna system for MIMO technologies
US9813127B2 (en) 2012-03-30 2017-11-07 Corning Optical Communications LLC Reducing location-dependent interference in distributed antenna systems operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods
US20150256237A1 (en) * 2012-11-29 2015-09-10 Corning Optical Communications LLC HYBRID INTRA-CELL / INTER-CELL REMOTE UNIT ANTENNA BONDING IN MULTIPLE-INPUT, MULTIPLE-OUTPUT (MIMO) DISTRIBUTED ANTENNA SYSTEMS (DASs)
WO2014085115A1 (fr) * 2012-11-29 2014-06-05 Corning Cable Systems Llc Liaison d'antennes d'unité distante intra-cellule/inter-cellule hybride dans des systèmes d'antenne distribués (das) à entrées multiples sorties multiples (mimo)
US9531452B2 (en) * 2012-11-29 2016-12-27 Corning Optical Communications LLC Hybrid intra-cell / inter-cell remote unit antenna bonding in multiple-input, multiple-output (MIMO) distributed antenna systems (DASs)
US9654189B2 (en) 2012-11-29 2017-05-16 Corning Optical Communications LLC Hybrid intra-cell / inter-cell remote unit antenna bonding in multiple-input, multiple-output (MIMO) distributed antenna systems (DASs)
US9979444B2 (en) 2012-11-29 2018-05-22 Corning Optical Communications LLC Hybrid intra-cell/inter-cell remote unit antenna bonding in multiple-input, multiple-output (MIMO) distributed antenna systems (DASs)
CN103281111A (zh) * 2013-06-04 2013-09-04 哈尔滨工业大学 基于选择合并的解码转发协作系统的信号智能转发方法
US9525472B2 (en) 2014-07-30 2016-12-20 Corning Incorporated Reducing location-dependent destructive interference in distributed antenna systems (DASS) operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods
US9929786B2 (en) 2014-07-30 2018-03-27 Corning Incorporated Reducing location-dependent destructive interference in distributed antenna systems (DASS) operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods
US10256879B2 (en) 2014-07-30 2019-04-09 Corning Incorporated Reducing location-dependent destructive interference in distributed antenna systems (DASS) operating in multiple-input, multiple-output (MIMO) configuration, and related components, systems, and methods
US9729267B2 (en) 2014-12-11 2017-08-08 Corning Optical Communications Wireless Ltd Multiplexing two separate optical links with the same wavelength using asymmetric combining and splitting
US10135561B2 (en) 2014-12-11 2018-11-20 Corning Optical Communications Wireless Ltd Multiplexing two separate optical links with the same wavelength using asymmetric combining and splitting

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