WO2013172696A1 - A system and method for enhancing handover in wireless networks - Google Patents

A system and method for enhancing handover in wireless networks Download PDF

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Publication number
WO2013172696A1
WO2013172696A1 PCT/MY2013/000095 MY2013000095W WO2013172696A1 WO 2013172696 A1 WO2013172696 A1 WO 2013172696A1 MY 2013000095 W MY2013000095 W MY 2013000095W WO 2013172696 A1 WO2013172696 A1 WO 2013172696A1
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WIPO (PCT)
Prior art keywords
base station
handover
target base
wireless networks
mobile station
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Application number
PCT/MY2013/000095
Other languages
French (fr)
Inventor
Chin Wee WONG
Rampurawala YUSUF
Original Assignee
Mimos Bhd.
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Publication date
Application filed by Mimos Bhd. filed Critical Mimos Bhd.
Publication of WO2013172696A1 publication Critical patent/WO2013172696A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • 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

Definitions

  • the present invention generally relates to a system and method for enhancing handover in wireless networks, more particularly the present invention relates to a system and method for declining handover latency in wireless networks.
  • the process mainly the "make-before-break” handover and the "break-before-make” handover, involves radio link between the mobile station and the serving base station to be disconnected with a new radio link between the mobile station and the target base station established.
  • the invention includes the steps of receiving a handover message including a specific ranging code and uplink resource information from a serving base station and transmitting the specific ranging code to a target base station using the uplink information.
  • US patent no. 8054807 B2 discloses a mobile communication system, more particularly to a handover method based on a human mobility behavior for reducing handover latency for facilitating seamless handover for real time traffic in a mobile worldwide interoperability for microwave access (WiMAX) networks.
  • WiMAX worldwide interoperability for microwave access
  • US patent application publication no. 2010208690 Al discloses fast handover protocols of a mobile station from a current base station connected to a target base station via a backbone in a WiMAX mobile communication network.
  • the message exchanges during the handover procedure of wireless networks using conventional methods are rather lengthy and requires communication between all corresponding stations in order to establish and deny radio links, highly contributing to the handover latency.
  • the present invention aspires to provide an improved wireless network to service its subscribers with the best quality of service within its coverage area, and to meet objectives of a wireless network handover so that continuous service is maintained at susceptible levels. It is an object of the present invention to provide solutions to the problems associated to the efficiency and reliability of the network service from a plurality of base stations such as high latency and possibilities of loss of connection for a mobile station traveling at high speeds around the cell boundary.
  • FIG 1 illustrates the system architecture of the wireless network handover in accordance to the present invention.
  • FIG. 2 illustrates the ladder diagram representing the handover procedure in accordance to the present invention.
  • FIG. 3 illustrates the ladder diagram representing the radio resource management procedure in accordance to the present invention.
  • FIG. 4 illustrates the flowchart for the handover procedure in accordance to the present invention.
  • FIG. 1 there is illustrated the system architecture of the wireless network handover in accordance to the present invention to enhance handover in wireless networks, wherein the system comprises a mobile station (101) and a plurality of base stations ( 102).
  • the plurality of base stations (102) in accordance to the present invention comprises a serving base station (103) networking with the mobile station (101) for providing network service subscription within a cell boundary, and a target base station (104) networking with the serving base station (103) for regulating the network service subscription in the event of a handover from the serving base station (102).
  • the mobile station (101) is serviced by the plurality of base stations (102) so that continuous service is regulated and maintained, whereby the target base station (104) substitutes and performs the role of the serving base station (103) in the event of the service handover.
  • the mobile station (101) in accordance to the preferred embodiment of the present invention includes a processor module, memory module, program or firmware module, and a radio frequency transceiver for transmitting and receiving signals to and from the plurality of base stations (102).
  • the plurality of base stations (102) in accordance to the preferred embodiment of the present invention is connected to a backhaul network via any servers preferably an access service network gateway, and includes a processor module, memory module, timer module, and a radio frequency transceiver for transmitting and receiving signals to and from the mobile station (101) and the access service network gateway.
  • the present invention provides that the plurality of base stations (102) embedded with a decision module (51) for determining a target base station (104) for network handover to take place.
  • the determination of the target base station (104) is carried out by the serving base station (103) of which acquires information from the mobile station (101) and the plurality of base stations (102), and thereafter processing the information for the selection of the target base station (104).
  • the decision module (51) compares information acquired from the mobile station (101) and the plurality of base stations (102), and clustering at least a target base station (104) from the compared information acceptable for said service handover
  • the serving base station (103) acquires information via radio resource management, and processes data information preferably using base station identification, available radio resource downlink, available radio resource uplink, radio resource fluctuation, and number of spare capacity report messages lost.
  • the decision module (51) in the preferred embodiment of the present invention is responsible for the preparation phase and the decision phase of the handover process in the wireless network to take place simultaneously. By overlapping the decision phase of the handover process in the wireless network, the total handover latency can be declined.
  • the decision phase and the preparation phase are elaborated further in the following descriptions. Referring to Figure 2, there is illustrated the ladder diagram representing the handover procedural method in accordance to the present invention, wherein the method for enhancing the handover procedure is initiated with transmitting handover request message from a mobile station (101) to a serving base station (103) containing information of potential pluralities of the target base station (104).
  • the figure represents a mobile station (101) and a plurality of base stations (102), which includes the serving base station (103), a first and a second target base station (104) drawn out in a ladder diagram mode to illustrate the relationship between message exchanges.
  • the mobile station (101) first transmits a handover request message (MOB_MSHO- REQ) to the serving base station (103) to initiate the handover procedure.
  • the serving base station (103) working in the background then searches the information gathered from the plurality of base stations (102) to determine which of the base stations (102) from the information received in the handover request message can currently serve the mobile station (101), which is the pluralities of the potential target base station (104).
  • the serving base station (103) Upon determining the potential pluralities of the target base station (104), the serving base station (103) reverts a handover respond message (MOB_BSHO-RSP) to the mobile station (101) with information records of pluralities of the potential target base station (104). At a simultaneous instance, the serving base station (103) transmits handover confirmation message (HO CNF) to pluralities of the potential target base station (104) listed in the information records contained in the handover respond message (MOB BSHO-RSP) to the mobile station (101).
  • HO CNF handover confirmation message
  • the parameter of the handover confirmation message (HO_CNF) in the present invention is preferably defined with the selection of an unconfirmed handover confirmation type (HO_CNF (unconfirm)), in order that the serving base station (103) reserves links to the potential pluralities of the target base station (104) during the handover process for the incoming mobile station (101).
  • the simultaneous transmissions of the handover respond message (MOB_BSHO- RSP) and also the handover confirmation message (HO_CNF (unconfirm)) as preferred in the present invention is the method of overlapping the preparation phase and the decision phase of a network service handover.
  • the decision module (51) as described earlier in the description for Figure 1 is responsible for overlapping the decision phase and the preparation phase.
  • the step of which transmitting the handover respond message (MOB_BSHO-RSP) to the mobile station (101) with information records of the potential pluralities of the target base station (104) is identified as the decision phase.
  • the step of which transmitting handover confirmation message (HO_CNF) from the serving base station (103) to every target base stations (104) listed in the information records contained in the handover respond message (MOB BSHO-RSP) to the mobile station (101), is identified as the preparation phase of which preparing and reserving links to the potential pluralities of the target base station (104) for an incoming mobile station (101) into the cell boundary.
  • the total handover latency of the wireless network can be greatly declined.
  • the mobile station (101) subsequently transmits a handover indication message (MOB_HO-IND) to the serving base station (103) to indicate the selected target base station (104) for the suitable subscription service handover.
  • MOB_HO-IND handover indication message
  • the mobile station (101) upon the mobile station (101) transcending the cell boundary of a current network service subscription with the serving base station (103), the mobile station (101) shall synchronize radio connection with the selected target base station (103), and proceed with network entry into the new cell boundary.
  • Ranging is thereafter executed for the mobile station (101) and the target base station (104), and finally establishing the data path between the mobile station (101) and the target base station (104).
  • the target base station (104) will then service the transcended mobile station (101), and the target base station (104) at this instant is the new serving base station (103).
  • FIG. 3 there is illustrated the ladder diagram representing the radio resource management procedure in accordance to the present invention to enhance handover.
  • the information required by the serving base station (103) to decide which of the plurality of the base stations (102) can serve the mobile station (101) is obtained through radio resource management procedures, however not limited to such a procedure.
  • the figure shows a ladder diagram where the serving base station (103) transmits information request message (Spare_Capacity_Req (Periodic/Event driven)) to the plurality of base stations (102) to request for relevant information.
  • the plurality of base stations (102) then reverts information report messages (Spare_Capacity_Rpt) to the serving base station (103) for updating the serving base station (103) with information relevant of the potential pluralities of the target base station (104) for network service subscription handover.
  • the table below the ladder diagram also the similar table in Figure 2, exemplifies the data collection from the plurality of base stations (102) to the serving base station (103).
  • the potential pluralities of the target base station (104) for service handover are determined using spare capacity request/report radio resource management messages, information such as available radio resource uplink/downlink, radio resource fluctuation, and etcetera.
  • Figure 4 illustrates the flowchart for the handover procedure in accordance to the present invention to enhance handover.
  • the process flow for carrying out the improvised handover in wireless networks, more specifically in mobile worldwide interoperability for microwave access networks begins when the mobile station (101) is first powered on.
  • the figure then illustrates that within a particular cell boundary, the pre-positioned mobile station (101) is linked to a serving base station (103), and after receiving signals to synchronize and register a radio link connection with the serving base station (103), the serving base station (103) provides network service subscription to the mobile station (101) via exchanging data with each other.
  • the process flow of the preferred embodiment of the present invention then continues with the mobile station (101) transmitting handover request message (MOB_MSHO- REQ) to the serving base station (103) containing information of the potential pluralities of the target base station (104), if a handover is required.
  • the mobile station (101) continues exchanging data information with the serving base station (103).
  • the serving base station (103) searches the information gathered from the plurality of base stations (102) to determine which of the base stations (102) from the information received in the handover request message can currently serve the mobile station (101), which is the potential pluralities of the target base station (104).
  • the serving base station (103) Upon determining potential pluralities of the target base station (104), the serving base station (103) reverts a handover respond message (MOB_BSHO-RSP) to the mobile station (101) with information records of the pluralities of the target base station (104). Simultaneously, the serving base station (103) transmits handover confirmation message (HO_CNF) to the pluralities of the target base station (104) listed in the information records contained in the handover respond message (MOB_BSHO-RSP) to the mobile station (101).
  • HO_CNF handover confirmation message
  • the parameter of the handover confirmation message (HO_CNF) in the present invention is preferably defined with the selection of an unconfirmed handover confirmation type (HO_CNF (unconfirm)), so that the serving base station (103) reserves links to the potential pluralities of the target base station (104) during the handover process.
  • HO_CNF unconfirmed handover confirmation type
  • the simultaneous transmissions of the handover respond message (MOB_BSHO- RSP) and also the handover confirmation message (HO_CNF (unconfirm)) in the preferred embodiment of the present invention is the overlapping of the preparation phase and the decision phase as explained in Figure 2.
  • the present invention is capable of performing the decision phase and the preparation phase because the preferred embodiment of the present invention includes a decision module (51) embedded into the plurality of base stations as described earlier in the description for Figure 1 and Figure 2.
  • the step of which transmitting the handover respond message (MOB_BSHO-RSP) to the mobile station (101) with information records of the pluralities of the target base station (104) is identified as the decision phase.
  • the step of which transmitting handover confirmation message (HO_CNF) from the serving base station (103) to the pluralities of the target base station (104) listed in the information records contained in the handover respond message (MOB_BSHO-RSP) to the mobile station (101), is identified as the preparation phase in order for preparing and reserving links to the potential pluralities of the target base station (104) for an incoming mobile station (101).
  • the mobile station (101) subsequently transmits a handover indication message (MOB_HO-IND) to the serving base station (103) to indicate the selected target base station (104) for an appropriate handover. Since handover confirmation message (HO_CNF) message has been already been already transmitted to the target base stations (104) from the serving base station (103) earlier during the preparation phase, the transmission of the handover confirmation message (HO_CNF) message is not required at this stage.
  • HO_CNF handover confirmation message
  • the mobile station (101) shall synchronize radio connection with the target base station (103), and proceed with network entry into the new cell boundary. Ranging is thereafter executed for the mobile station (101) and the target base station (104), and finally establishing the data path between the mobile station (101) and the target base station ( 104).
  • the target base station (104) will then service the transcended mobile station (101), and the target base station (104) at this instant is the new serving base station (103).
  • the new serving base station (103) and the mobile station (101) exchanges data information whilst continuing the network service subscription.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The present invention generally relates to a system and method for enhancing handover in wireless networks, more particularly the present invention relates to a system and method for declining handover latency in wireless networks, wherein the system comprises a mobile station (101) and a plurality of base stations (102) including a serving base station (103) and a target base station (104). The system and method decline the handover latency by overlapping of the decision phase and the preparation phase of handover process in a wireless network.

Description

A SYSTEM AND METHOD FOR ENHANCING HANDOVER IN WIRELESS
NETWORKS
TECHNICAL FIELD
The present invention generally relates to a system and method for enhancing handover in wireless networks, more particularly the present invention relates to a system and method for declining handover latency in wireless networks.
BACKGROUND OF INVENTION
In a wireless communication network where the mobile station is always traveling across different cell boundaries, handover is required to maintain connectivity with the network.
The process, mainly the "make-before-break" handover and the "break-before-make" handover, involves radio link between the mobile station and the serving base station to be disconnected with a new radio link between the mobile station and the target base station established.
The concern herein is directed towards the employment of the break-before-make type handover because the radio link between the mobile station and the serving base station, during this procedure, is broken before the radio link between the mobile station and target base station is established. For a substantial duration of time where the service is interrupted, the efficiency and reliability of the network service deteriorates tremendously. Moreover, the mobile station is also prone to losing network connection with the base stations when traveling at high speeds around the cell boundary, as it will be apparent that the time required for establishing the network connection between mobile station and the base stations demands quicker response. There are several prior arts that relates to the system and method for enhancing handover in wireless network. US patent application publication no. 201 1044287 Al discloses a handover procedure, and more particularly, to a method of reducing latency in performing handover using fast ranging.
The invention includes the steps of receiving a handover message including a specific ranging code and uplink resource information from a serving base station and transmitting the specific ranging code to a target base station using the uplink information.
US patent no. 8054807 B2 discloses a mobile communication system, more particularly to a handover method based on a human mobility behavior for reducing handover latency for facilitating seamless handover for real time traffic in a mobile worldwide interoperability for microwave access (WiMAX) networks.
US patent application publication no. 2010208690 Al discloses fast handover protocols of a mobile station from a current base station connected to a target base station via a backbone in a WiMAX mobile communication network. The message exchanges during the handover procedure of wireless networks using conventional methods however are rather lengthy and requires communication between all corresponding stations in order to establish and deny radio links, highly contributing to the handover latency.
SUMMARY OF INVENTION
The present invention aspires to provide an improved wireless network to service its subscribers with the best quality of service within its coverage area, and to meet objectives of a wireless network handover so that continuous service is maintained at susceptible levels. It is an object of the present invention to provide solutions to the problems associated to the efficiency and reliability of the network service from a plurality of base stations such as high latency and possibilities of loss of connection for a mobile station traveling at high speeds around the cell boundary.
It is a further object of the present invention to provide a system for enhancing handover in wireless networks in order to decline handover latency, wherein the plurality of base stations is configured with a decision module and includes a serving base station and a target base station.
It is yet a further object of the present invention to provide a method for enhancing handover in wireless networks in order to decline handover latency, wherein the method includes overlapping of the decision phase and the preparation phase of the handover process.
It is therefore the aim of the present invention to provide an improved system and method of handover in wireless networks to address the handover latency issues when a mobile station transcends across a new cell boundary.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 illustrates the system architecture of the wireless network handover in accordance to the present invention.
Figure 2 illustrates the ladder diagram representing the handover procedure in accordance to the present invention.
Figure 3 illustrates the ladder diagram representing the radio resource management procedure in accordance to the present invention.
Figure 4 illustrates the flowchart for the handover procedure in accordance to the present invention. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Described below are preferred embodiments of the present invention with reference to the accompanying drawings. Each of the following preferred embodiments describes an example not limiting in any aspect.
Referring to Figure 1, there is illustrated the system architecture of the wireless network handover in accordance to the present invention to enhance handover in wireless networks, wherein the system comprises a mobile station (101) and a plurality of base stations ( 102).
The plurality of base stations (102) in accordance to the present invention comprises a serving base station (103) networking with the mobile station (101) for providing network service subscription within a cell boundary, and a target base station (104) networking with the serving base station (103) for regulating the network service subscription in the event of a handover from the serving base station (102).
Since such networking is based on a cellular concept, and where the mobility of such devices apparently inevitable, the mobile station (101) is serviced by the plurality of base stations (102) so that continuous service is regulated and maintained, whereby the target base station (104) substitutes and performs the role of the serving base station (103) in the event of the service handover.
The mobile station (101) in accordance to the preferred embodiment of the present invention includes a processor module, memory module, program or firmware module, and a radio frequency transceiver for transmitting and receiving signals to and from the plurality of base stations (102).
The plurality of base stations (102) in accordance to the preferred embodiment of the present invention is connected to a backhaul network via any servers preferably an access service network gateway, and includes a processor module, memory module, timer module, and a radio frequency transceiver for transmitting and receiving signals to and from the mobile station (101) and the access service network gateway. In precision to the significance of the preferred embodiment, the present invention provides that the plurality of base stations (102) embedded with a decision module (51) for determining a target base station (104) for network handover to take place. The determination of the target base station (104) is carried out by the serving base station (103) of which acquires information from the mobile station (101) and the plurality of base stations (102), and thereafter processing the information for the selection of the target base station (104). The decision module (51) compares information acquired from the mobile station (101) and the plurality of base stations (102), and clustering at least a target base station (104) from the compared information acceptable for said service handover
The serving base station (103) acquires information via radio resource management, and processes data information preferably using base station identification, available radio resource downlink, available radio resource uplink, radio resource fluctuation, and number of spare capacity report messages lost.
The decision module (51) in the preferred embodiment of the present invention is responsible for the preparation phase and the decision phase of the handover process in the wireless network to take place simultaneously. By overlapping the decision phase of the handover process in the wireless network, the total handover latency can be declined. The decision phase and the preparation phase are elaborated further in the following descriptions. Referring to Figure 2, there is illustrated the ladder diagram representing the handover procedural method in accordance to the present invention, wherein the method for enhancing the handover procedure is initiated with transmitting handover request message from a mobile station (101) to a serving base station (103) containing information of potential pluralities of the target base station (104).
As shown in the figure, the figure represents a mobile station (101) and a plurality of base stations (102), which includes the serving base station (103), a first and a second target base station (104) drawn out in a ladder diagram mode to illustrate the relationship between message exchanges.
The mobile station (101) first transmits a handover request message (MOB_MSHO- REQ) to the serving base station (103) to initiate the handover procedure. The serving base station (103) working in the background then searches the information gathered from the plurality of base stations (102) to determine which of the base stations (102) from the information received in the handover request message can currently serve the mobile station (101), which is the pluralities of the potential target base station (104).
Upon determining the potential pluralities of the target base station (104), the serving base station (103) reverts a handover respond message (MOB_BSHO-RSP) to the mobile station (101) with information records of pluralities of the potential target base station (104). At a simultaneous instance, the serving base station (103) transmits handover confirmation message (HO CNF) to pluralities of the potential target base station (104) listed in the information records contained in the handover respond message (MOB BSHO-RSP) to the mobile station (101).
The parameter of the handover confirmation message (HO_CNF) in the present invention is preferably defined with the selection of an unconfirmed handover confirmation type (HO_CNF (unconfirm)), in order that the serving base station (103) reserves links to the potential pluralities of the target base station (104) during the handover process for the incoming mobile station (101). The simultaneous transmissions of the handover respond message (MOB_BSHO- RSP) and also the handover confirmation message (HO_CNF (unconfirm)) as preferred in the present invention is the method of overlapping the preparation phase and the decision phase of a network service handover. The decision module (51) as described earlier in the description for Figure 1 is responsible for overlapping the decision phase and the preparation phase. The step of which transmitting the handover respond message (MOB_BSHO-RSP) to the mobile station (101) with information records of the potential pluralities of the target base station (104) is identified as the decision phase. The step of which transmitting handover confirmation message (HO_CNF) from the serving base station (103) to every target base stations (104) listed in the information records contained in the handover respond message (MOB BSHO-RSP) to the mobile station (101), is identified as the preparation phase of which preparing and reserving links to the potential pluralities of the target base station (104) for an incoming mobile station (101) into the cell boundary.
By overlapping the decision phase and the preparation phase whilst maintaining the current state with transmitting handover confirmation message (HO_CNF) from the serving base station (103) to the pluralities of the potential target base station (104), the total handover latency of the wireless network can be greatly declined.
After which, the mobile station (101) subsequently transmits a handover indication message (MOB_HO-IND) to the serving base station (103) to indicate the selected target base station (104) for the suitable subscription service handover.
Since handover confirmation message (HO_CNF) has been already transmitted to the pluralities of the target base station (104) from the serving base station (103) earlier during the preparation phase, the transmission of the handover confirmation message (HO_CNF) is apparently not required at this stage.
Then, upon the mobile station (101) transcending the cell boundary of a current network service subscription with the serving base station (103), the mobile station (101) shall synchronize radio connection with the selected target base station (103), and proceed with network entry into the new cell boundary.
Ranging is thereafter executed for the mobile station (101) and the target base station (104), and finally establishing the data path between the mobile station (101) and the target base station (104). The target base station (104) will then service the transcended mobile station (101), and the target base station (104) at this instant is the new serving base station (103).
Referring to Figure 3, there is illustrated the ladder diagram representing the radio resource management procedure in accordance to the present invention to enhance handover.
The information required by the serving base station (103) to decide which of the plurality of the base stations (102) can serve the mobile station (101) is obtained through radio resource management procedures, however not limited to such a procedure.
The procedures for obtaining the information required by the service base station (103) to decide which of the plurality of the base stations (102) can serve the mobile station (101) will be apparent to a skilled person to apply and use different methods suited for such procedural.
The figure shows a ladder diagram where the serving base station (103) transmits information request message (Spare_Capacity_Req (Periodic/Event driven)) to the plurality of base stations (102) to request for relevant information. The plurality of base stations (102) then reverts information report messages (Spare_Capacity_Rpt) to the serving base station (103) for updating the serving base station (103) with information relevant of the potential pluralities of the target base station (104) for network service subscription handover.
The table below the ladder diagram, also the similar table in Figure 2, exemplifies the data collection from the plurality of base stations (102) to the serving base station (103). The potential pluralities of the target base station (104) for service handover are determined using spare capacity request/report radio resource management messages, information such as available radio resource uplink/downlink, radio resource fluctuation, and etcetera. Referring now to Figure 2 and Figure 4, Figure 4 illustrates the flowchart for the handover procedure in accordance to the present invention to enhance handover. The process flow for carrying out the improvised handover in wireless networks, more specifically in mobile worldwide interoperability for microwave access networks begins when the mobile station (101) is first powered on.
The figure then illustrates that within a particular cell boundary, the pre-positioned mobile station (101) is linked to a serving base station (103), and after receiving signals to synchronize and register a radio link connection with the serving base station (103), the serving base station (103) provides network service subscription to the mobile station (101) via exchanging data with each other.
The process flow of the preferred embodiment of the present invention then continues with the mobile station (101) transmitting handover request message (MOB_MSHO- REQ) to the serving base station (103) containing information of the potential pluralities of the target base station (104), if a handover is required. For a process where handover is not required, the mobile station (101) continues exchanging data information with the serving base station (103). The serving base station (103) then searches the information gathered from the plurality of base stations (102) to determine which of the base stations (102) from the information received in the handover request message can currently serve the mobile station (101), which is the potential pluralities of the target base station (104). Upon determining potential pluralities of the target base station (104), the serving base station (103) reverts a handover respond message (MOB_BSHO-RSP) to the mobile station (101) with information records of the pluralities of the target base station (104). Simultaneously, the serving base station (103) transmits handover confirmation message (HO_CNF) to the pluralities of the target base station (104) listed in the information records contained in the handover respond message (MOB_BSHO-RSP) to the mobile station (101). The parameter of the handover confirmation message (HO_CNF) in the present invention is preferably defined with the selection of an unconfirmed handover confirmation type (HO_CNF (unconfirm)), so that the serving base station (103) reserves links to the potential pluralities of the target base station (104) during the handover process.
The simultaneous transmissions of the handover respond message (MOB_BSHO- RSP) and also the handover confirmation message (HO_CNF (unconfirm)) in the preferred embodiment of the present invention is the overlapping of the preparation phase and the decision phase as explained in Figure 2.
The present invention is capable of performing the decision phase and the preparation phase because the preferred embodiment of the present invention includes a decision module (51) embedded into the plurality of base stations as described earlier in the description for Figure 1 and Figure 2.
The step of which transmitting the handover respond message (MOB_BSHO-RSP) to the mobile station (101) with information records of the pluralities of the target base station (104) is identified as the decision phase.
The step of which transmitting handover confirmation message (HO_CNF) from the serving base station (103) to the pluralities of the target base station (104) listed in the information records contained in the handover respond message (MOB_BSHO-RSP) to the mobile station (101), is identified as the preparation phase in order for preparing and reserving links to the potential pluralities of the target base station (104) for an incoming mobile station (101).
By overlapping the decision phase and the preparation phase while maintaining the current state from transmitting handover confirmation message (HO_CNF) from the serving base station (103) to the pluralities of the target base station (104), the total handover latency of the wireless network can be greatly declined. The mobile station (101) subsequently transmits a handover indication message (MOB_HO-IND) to the serving base station (103) to indicate the selected target base station (104) for an appropriate handover. Since handover confirmation message (HO_CNF) message has been already been already transmitted to the target base stations (104) from the serving base station (103) earlier during the preparation phase, the transmission of the handover confirmation message (HO_CNF) message is not required at this stage. Then, in the event anticipated that the mobile station (101) transcends the cell boundary of a current network service subscription, the mobile station (101) shall synchronize radio connection with the target base station (103), and proceed with network entry into the new cell boundary. Ranging is thereafter executed for the mobile station (101) and the target base station (104), and finally establishing the data path between the mobile station (101) and the target base station ( 104).
The target base station (104) will then service the transcended mobile station (101), and the target base station (104) at this instant is the new serving base station (103). The new serving base station (103) and the mobile station (101) exchanges data information whilst continuing the network service subscription.
In as much as the present invention is subject to many variations, modifications and changes in detail, it is intended that all matter contained in the foregoing description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Claims

1. A system for enhancing handover in wireless networks comprises:
a mobile station (101); and
a plurality of base stations (102) including a serving base station (103) networking with the mobile station (101) for providing network service subscription within a cell boundary, and a target base station (104) networking with the serving base station (103) for regulating the network service subscription in the event of a handover from the serving base station (102); wherein, the target base station (104) substitutes and performs the role of the serving base station (103) in the event of the service handover;
characterized in that the plurality of base stations (102) is embedded with a decision module (51) for determining pluralities of the potential target base station (104) from the serving base station (103), by comparing information acquired from the mobile station (101) and the plurality of base stations (102), and clustering at least a target base station (104) from the compared information acceptable for said service handover.
2. A system for enhancing handover in wireless networks in accordance to claim 1, wherein mobile station (101) includes modules of either a processor, memory, program, radio frequency transceiver or a combination thereof.
3. A system for enhancing handover in wireless networks in accordance to claim 1, wherein the plurality of base stations (102) includes modules of either a processor, memory, timer, radio frequency transceiver or a combination thereof.
4. A system for enhancing handover in wireless networks in accordance to claim 1, wherein the plurality of base stations (102) is connected to a backhaul network via a server.
5. A system for enhancing handover in wireless networks in accordance to claim 1, wherein the serving base station (103) acquires information via radio resource management.
6. A system for enhancing handover in wireless networks in accordance to claim 1, wherein the serving base station (103) preferably acquires information of base station identification, available radio resource downlink, available radio resource uplink, radio resource fluctuation, and number of spare capacity report messages lost.
7. A method of enhancing handover in wireless networks for the system as claimed in claim 1 comprises the steps of:
transmitting handover request message from a mobile station (101) to a serving base station (103) containing pluralities of the potential target base station (104) for service network handover operation;
determining pluralities of the potential target base station (104);
transmitting handover response message to the mobile station (101) with the information list of the pluralities of the potential target base station (104) and simultaneously sending handover confirmation message to the pluralities of the potential target base station ( 104) ;
transmitting handover indication message from the mobile station (101) with the selected target base station (104);
synchronizing, ranging and establishing a radio connection between the mobile station (101) and the target base station (104).
8. A method of enhancing handover in wireless networks in accordance to claim 7, wherein pluralities of the potential target base station (104) are determined by maintaining current state of mobile stations (101).
9. A method of enhancing handover in wireless networks in accordance to claim 7, wherein the pluralities of the potential target base station (104) are preferably determined using radio resource management procedures.
10. A method of enhancing handover in wireless networks in accordance to claim 7, wherein the pluralities of the potential target base station (104) are preferably determined using base station identification, available radio resource downlink, available radio resource uplink, radio resource fluctuation, and number of spare capacity report messages lost.
PCT/MY2013/000095 2012-05-18 2013-05-10 A system and method for enhancing handover in wireless networks WO2013172696A1 (en)

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