WO2008023257A2 - Appareil, procédé et progiciel assurant la robustesse améliorée de transfert en réseau e-utran avec radiomessagerie de l'équipement d'utilisateur actif - Google Patents

Appareil, procédé et progiciel assurant la robustesse améliorée de transfert en réseau e-utran avec radiomessagerie de l'équipement d'utilisateur actif Download PDF

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Publication number
WO2008023257A2
WO2008023257A2 PCT/IB2007/002438 IB2007002438W WO2008023257A2 WO 2008023257 A2 WO2008023257 A2 WO 2008023257A2 IB 2007002438 W IB2007002438 W IB 2007002438W WO 2008023257 A2 WO2008023257 A2 WO 2008023257A2
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WO
WIPO (PCT)
Prior art keywords
base station
timer
user equipment
handover
expiration
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Application number
PCT/IB2007/002438
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English (en)
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WO2008023257A3 (fr
Inventor
Vinh Van Pan
Markku J. Vainikka
Benoist Sebire
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Nokia Corporation
Nokia, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Nokia Corporation, Nokia, Inc. filed Critical Nokia Corporation
Publication of WO2008023257A2 publication Critical patent/WO2008023257A2/fr
Publication of WO2008023257A3 publication Critical patent/WO2008023257A3/fr

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Classifications

    • 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
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the exemplary and non-limiting embodiments of this invention relate generally to wireless communication systems, methods, devices and computer program products and, more specifically, relate to techniques for use during handover.
  • L2 layer 2 (e.g., the RLC/MAC layer)
  • L3 layer 3 (e.g., the RRC layer)
  • E-UTRAN and also referred to as UTRAN-LTE is presently under consideration within the 3GPP.
  • Step 1 The UE is triggered to send a MEASUREMENT REPORT by the rules set by system information, specification etc.
  • Step 2 The Source eNB makes a decision based on the MEASUREMENT
  • the Source eNB prepares the target eNB for handover and passes relevant information in the Handover Request.
  • Step 3 The Target eNB prepares the HO with L1/L2 and responds to the source eNB by providing new C-RNTI and possibly other parameters such as access parameters, SIBs, etc. After reception of the accepted preparation of HO, the source eNB begins forwarding data packets to the target eNB.
  • Step 4 The UE receives a HANDOVER COMMAND with necessary parameters such as the new C-RNTI, possible starting time, target eNB SIBs, etc. The UE may need to acknowledge reception of the HO COMMAND with a RLC acknowledgment procedure (e.g., in GSM there is no acknowledgment).
  • a RLC acknowledgment procedure e.g., in GSM there is no acknowledgment.
  • Step 5 After expiry of the starting time in the HO COMMAND, the UE performs synchronization to the target eNB and then begins acquiring the UL timing advance.
  • Step 6 The network responds with UL allocation and timing advance.
  • Step 7a The target eNB informs the success of the HO to the source eNB, which can then clear already forwarded data from its buffers.
  • the source eNB still continues forwarding UE data if it has data in its buffers, or if the UPE still forwards data to it.
  • Step 7b The UE location information is updated to the MME/UPE in order to enable the UPE to forward packets directly to the target eNB.
  • a method that comprises starting a timer in a base station after sending a handover information message, and stopping the timer upon a condition, comprising either receiving an expected handover related message, or expiration of a maximum allowed time value of the timer.
  • a method that comprises starting a timer in a user equipment after an initiation of a handover procedure, and stopping the timer upon a condition, comprising either receiving an expected handover related message, or expiration of a maximum allowed time value of the timer, where at an expiration of the maximum allowed time value the user equipment begins listening for a page to obtain handover related information.
  • a computer readable medium encoded with a computer program executable by a processor to perform actions that comprise starting a timer in a base station after sending a handover information message, and stopping the timer upon a condition, comprising either receiving an expected handover related message, or expiration of a maximum allowed time value of the timer.
  • a computer readable medium encoded with a computer program executable by a processor to perform actions that comprise starting a timer in a user equipment after an initiation of a handover procedure, and stopping the timer upon a condition, comprising either receiving an expected handover related message, or expiration of a maximum allowed time value of the timer, where at an expiration of the maximum allowed time value the user equipment begins listening for a page to obtain handover related information.
  • an apparatus that comprises a handover control unit coupled to a transmitter configured to start a timer in a base station after sending a handover information message, and the handover control unit coupled to a receiver configured to stop the timer upon a condition, comprising either receiving an expected handover related message, or expiration of a maximum allowed time value of the timer.
  • an apparatus that comprises a handover control unit configured to start a timer in a user equipment after an initiation of a handover procedure, and the handover control unit coupled to a wireless receiver configured to stop the timer upon a condition, comprising either receiving an expected handover related message, or expiration of a maximum allowed time value of the timer, where at an expiration of the maximum allowed time value the wireless receiver of the user equipment is further configured to begin listening for a page to obtain handover related information.
  • an apparatus that comprises means for starting a timer in a base station after sending a handover information message, and means for stopping the timer upon a condition, comprising either receiving an expected handover related message, or expiration of a maximum allowed time value of the timer.
  • an apparatus that comprises means for starting a timer in a user equipment after an initiation of a handover procedure, and means stopping the timer upon a condition, comprising either receiving an expected handover related message, or expiration of a maximum allowed time value of the timer, where at an expiration of the maximum allowed time value the user equipment begins listening for a page to obtain handover related information.
  • a method that comprises sending a handover related message to a user equipment from a base station, starting a timer after sending the handover related message to the user equipment, and in the event the timer expires before receiving an expected response from the user equipment to the handover related message, the base station initiating a communication to the user equipment on a page channel, where the communication includes information contained in the handover related message.
  • Figure 1 shows a simplified block diagram of various electronic devices that are suitable for use in practicing the exemplary embodiments of this invention.
  • Figure 2 illustrates an Intra-MME/UPE HO, and is derived from Figure
  • Figure 3 illustrates an Intra-MME/UPE HO that is enhanced in accordance with the exemplary embodiments of this invention.
  • Figure 4 A is a logic flow diagram that is illustrative of a method executed by an eNB in accordance with the exemplary embodiments of this invention.
  • Figure 4B is a logic flow diagram that is illustrative of a further method executed by an eNB in accordance with the exemplary embodiments of this invention.
  • Figure 5 is a logic flow diagram that is illustrative of a method executed by a UE in accordance with the exemplary embodiments of this invention.
  • Figure 6 A is a logic flow diagram that is illustrative of a method executed by a base station in accordance with the exemplary embodiments of this invention.
  • Figure 6B is a logic flow diagram that is illustrative of a method executed by a user equipment in accordance with the exemplary embodiments of this invention.
  • Figure 7 is a logic flow diagram that is illustrative of a method executed by a base station in accordance with the exemplary embodiments of this invention.
  • the exemplary embodiments of this invention address the foregoing and other problems, and provide support for a seamless and lossless HO in E-UTRAN that enhances the robustness of the HO against at least the situation discussed above, that is, the failure of the UE to correctly receive the HANDOVER COMMAND in Step 4 of Figure 2.
  • a wireless network 1 is adapted for communication with a UE 10 via at least one Node B or base station 12 and also referred to herein as an eNode B 12 or eNB 12.
  • the network 1 may include at least one Network Element 14 coupled to the eNode B 12 via a data link 13.
  • the Network Element 14 may include the MME and UPE functionality, and in general may be referred to as the aGW 14.
  • the Network Element 14 may be referred to interchangeably as the MME/UPE 14 or as the aGW 14.
  • the UE 10 includes a data processor (DP) 1 OA, a memory (MEM) 1 OB that stores a program (PROG) 1OC, and a suitable radio frequency (RF) transceiver 1OD for bidirectional wireless communications with the eNode B 12, which also includes a DP 12 A, a MEM 12B that stores a PROG 12C, and a suitable RF transceiver 12D.
  • the eNode B 12 is coupled via the data path 13 to the aGW 14 (containing the MME/UPE functionality) that also includes at least one DP 14A and a MEM 14B storing an associated PROG 14C.
  • At least one of the PROGs 1OC, 12C and 14C is assumed to include program instructions that, when executed by the associated DP, enable the electronic device to operate in accordance with the exemplary embodiments of this invention, as will be discussed below in greater detail.
  • FIG. 1 Also shown in Figure 1 is at least one second eNode B, referred to as 12'.
  • the eNode B 12 may be considered the Source eNode B, i.e., the eNode B to which the UE 10 is currently connected and communicating in the associated serving cell, and the eNode B 12' may be considered the Target eNode B, i.e., the eNode B to which the UE 10 is to be connected and communicating with in the target cell after the HO procedure is completed.
  • the serving cell and the target cell may at least partially overlap one another.
  • Each eNode B 12, 12' may be assumed to include a HO control function or unit 12E.
  • Each eNode B 12, 12' may be further assumed to include a Timer unit 12F, referred to below as Timer Tl, that operates in conjunction with the HO unit 12E.
  • the UE 10 may be assumed to include a HO control function or unit 1OE and an associated Timer 1OF also referred to below as Timer_T2.
  • the HO units 1OE, 12E and Timer units 1 OF, 12F are constructed and operated in accordance with the exemplary embodiments of this invention, as described in greater detail below.
  • Each eNode B 12, 12' may also be assumed to include a RRC function 12G, the operation of which in certain exemplary embodiments of this invention is discussed below.
  • a corresponding RRC function 1 OG is shown in the UE 10.
  • HO and timer units 1 OE, 12E, 1 OF, 12F are shown as separate elements in Figure 1, in practice they may form a part of the respective RRC functions 1OG, 12G, as the RRC typically embodies the primary radio interface control protocol.
  • the various embodiments of the UE 10 can include, but are not limited to, cellular telephones, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • PDAs personal digital assistants
  • portable computers having wireless communication capabilities
  • image capture devices such as digital cameras having wireless communication capabilities
  • gaming devices having wireless communication capabilities
  • music storage and playback appliances having wireless communication capabilities
  • Internet appliances permitting wireless Internet access and browsing, as well as portable units or terminals that incorporate combinations of such functions.
  • the exemplary embodiments of this invention may be implemented by computer software executable by the DPlOA of the UE 10, the DP 12A of the eNode Bs 12 and 12', the DP14A of the aGW 14, or by hardware, or by a combination of software and hardware.
  • the MEMs 1OB, 12B and 14B may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the DPs 1OA, 12A and 14A may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples.
  • Timer_Tl 12F is provided at the eNBs 12, 12' and the Timer_T2 1OE is provided at the UE 10.
  • Timer_Tl 12F is defined as a HO guard timer of the eNB 12, 12', and in the example shown in Figure 3 Timer Tl is used by the target eNB 12', and is started at the time that the target eNB 12' sends the Context Confirm message to the source eNB 12 as in Step 3.
  • Timer_Tl 12F is used to check that a signal is received from the UE 10 by Step 5 or 6 at the latest.
  • Timer Tl 12F is after successful completion of Step 5 or 6.
  • Timer Tl 12F is used by the source eNB 12, is started after Step 4, and is stopped when reaching Step 7a.
  • Timer_T2 1OF is defined as a HO guard timer of the UE 10, and may be started when the UE 10 sends the Measurement Report to the source eNB such as at Step 1, i.e., when the UE 10 expects to receive HO Command from the source eNB 12 as in Step 4.
  • a suitable condition to stop Timer_T2 1 OF is at the successful completion of Step 4.
  • Timer Tl and Timer_T2 may be considered as cell-specific network system parameters, and the maximum duration of Timer_Tl and Timer_T2 is preferably less than the allowed or expected HO execution time.
  • the value for Timer_T2 may be sent to, and subsequently updated in, the UE 10 in, for example, cell-specific broadcast system information.
  • Timer Tl and Timer_T2 times out, i.e., reaches the maximum allowed time value measured in, for example, milliseconds or seconds, then it can be assumed that an error has occurred during the HO signaling message flow, and corrective action can be taken.
  • the target eNB 12' may notify the source eNB 12 of the time-out of Timer l and may provide any related information updates as shown in Figure 3, for convenience, as message 4a.
  • the source eNB 12B may begin paging the ACTIVE state UE 10 in the current cell as shown in Figure 3, for convenience, as message 4b.
  • the paging can occur by whatever suitable technique is selected for use in E-UTRAN.
  • the content of a Paging Cause and a Paging Record sent to the UE 10 may repeat all of the content of HO Command, including the new C-RNTI with the most recent valid updates.
  • the target eNB 12' may also page the ACTIVE state UE 10 in the target cell and, in this case, the content of the paging message can be similar to that sent by the source eNB 12 to facilitate the HO as shown in Figure 3, for convenience, as an optional message 4c.
  • the source eNB 12 begins paging the ACTIVE state UE in the current cell as in message 4b in Figure 3.
  • the content of a Paging Cause and a Paging Record sent to the UE 10 may repeat all of the content of HO Command, including the new C-RNTI with the most recent valid updates.
  • the UE 10 In the event that Timer_T2 1OF expires, and the UE 10 does not receive the expected message(s) from the network, such as from the source eNB 12 in the current cell, the UE 10 begins listening to the paging channel of the current cell and, if possible, to the paging channel(s) of those neighboring cell(s) that the UE 10 was able to measure and report at Step 1 in Figure 3. In this case the UE 10 is enabled to receive the HO command and associated information from one of the received Pages and is enabled to respond to the received Page, and associated HO-related information, either from the source or target eNB 12, 12' and continue from Step 5 of Figure 3. That is, the UE 10 is provided the expected HO Command and associated information through an alternate signaling mechanism (i.e., through a Paging channel).
  • an alternate signaling mechanism i.e., through a Paging channel
  • the paging of an IDLE state UE 10 is originated from the aGW 14, and the PAGING message is formed and sent by the RRC unit 12G of the eNB 12.
  • the eNB RRC unit 12G is permitted to initiate paging of an ACTIVE state UE 10 for control purposes.
  • the source eNB 12 may use the currently valid, also referred to as the old C-RNTI as the UE ID for paging.
  • the RRC function 12G of the target eNB 12' may use the old C-RNTI, or some other ID, of the UE 10, which is known from the context data received from the source eNB 12 in Step 2.
  • the source or target eNB 12, 12' to notify the aGW 14 upon the expiry of Timer Tl so that urgent paging can be initiated from the aGW 14, and Timer_T2 may be generalized and extended so as to force the UE 10 back to the IDLE state, as from the ACTIVE state, to listen for possible urgent paging initiated by the aGW 14.
  • the eNB 12 may send the HO command and related information to the aGW 14 to be included in the IDLE state page, or the eNB
  • RRC functionality 12G may know that the IDLE state page initiated by the aGW 14 should include this information. In either case it is most desirable that the aGW 14 request only a subset of the eNBs located in a paging area to page the UE 10, such as only the source eNB 12 and the target eNB 12'. As such, the paging notification sent from the aGW 14 preferably includes at least the identifications of the involved source and target eNBs 12, 12'.
  • Optional messages 4d and 4e in Figure 3 show this process for an example where the target eNB 12' sends a Notify message to the aGW 14, and the aGW 14 sends an IDLE state Page Notification to both the source eNB 12 and the target eNB 12'.
  • the HO command and related information could be sent as part of the Notification message 4d.
  • the expiration of Timer_T2 1OF has triggered the UE 10 to enter the IDLE state so as to receive the IDLE state page from one of the eNBs 12, 12' so as to perform the HO recovery process.
  • the UE 10 transitions back to the IDLE state to receive the page, it is not implied that the current call is dropped. For example, a temporary state transition to IDLE may be performed for call recovery purposes so as to receive the necessary HO information. During this period the ACTIVE context of the UE 10 may remain in effect, at least for some predetermined maximum amount of time such as one set by an associated RRC 1OG timer.
  • the target eNB 12 may communicate with the MME/UPE 14 to resume the LTE ACTIVE state.
  • an aspect of the exemplary embodiments of this invention is in providing distributed HO-related timers (Timer l , Timer_2) at those nodes, like the eNBs 12 and UE 10, where the HO-related signaling and control resides.
  • the exemplary embodiments of this invention in one aspect thereof, provide a method for HO of the UE 10 by: initiating operation of a timer in at least one of the target eNB 12' and source eNB 12 after initiation of the HO procedure (Step 4A) and, in the event the timer expires before the UE 10 can be expected to respond to a HO-related message sent from the source eNB 12, initiating (at Step 4B) a communication to the UE 10 on a Paging channel from at least one of the target eNB 12' and source eNB 12, where the communication includes information contained in the HO-related message.
  • Step 4B During operation of Step 4B, and if the communication is initiated by the target eNB 12', the target eNB sends a notification to the source eNB 12, and the source eNB 12 sends the communication in a Paging channel of the serving cell.
  • the target eNB 12' may also send the communication in a Paging channel of the target cell.
  • the UE 10 may be in the ACTIVE state.
  • the exemplary embodiments of this invention in a further aspect thereof, provide a method for HO of the UE 10 by: initiating operation of a timer in at least one of the target eNB 12' and source eNB 12 after initiation of the HO procedure (Step 4A) and, in the event the timer expires before the UE 10 can be expected to respond to a HO-related message sent from the source eNB 12 (Step 4B'), and in the event that it is determined that the radio connection is lost (Step 4C), contacting the aGW 14 with a notify message (Step 4D') and, in response to receiving a page notification from the aGW 14 (Step 4E'), beginning IDLE state paging of the UE 10 (Step 4F'), where it is assumed that expiration of the Timer_T2 1OF has caused the UE 10 to (at least temporarily) be placed in a condition to be responsive to an IDLE state page
  • the exemplary embodiments of this invention in a further aspect thereof, provide an eNB-resident computer program product that functions to perform HO of the UE 10 by: initiating operation of a timer in at least one of the target eNB 12' and source eNB 12 after initiation of the HO procedure and, in the event the timer expires before the UE 10 can be expected to respond to a HO-related message sent from the source eNB 12, initiating a communication to the UE 10 on a Paging channel from at least one of the target eNB 12' and source eNB 12, where the communication includes information contained in the HO-related message.
  • the exemplary embodiments of this invention in another aspect thereof, provide a network device, such as the eNB, that is constructed to perform HO of the UE 10, and that includes a timer unit and a unit to initiate operation of the timer unit in at least one of the target eNB 12' and source eNB 12 after the HO procedure is started and, in the event the timer expires before the UE 10 can be expected to respond to a HO-related message sent from the source eNB 12, to initiate a communication to the UE 10 on a Paging channel from at least one of the target eNB 12' and source eNB 12, where the communication includes information contained in the HO- related message.
  • a network device such as the eNB
  • the exemplary embodiments of this invention in another aspect thereof, provide a method for the UE 10 to perform a HO procedure by: initiating operation of a timer after the start of the HO procedure (Step 5A); and, in the event the timer expires before the UE 10 receives an expected HO-related message sent from a source eNB, to begin listening (Step 5B) to a Paging channel of a current cell and, optionally, to Paging channel(s) of neighboring cell(s); to receive (Step 5C) the expected HO-related message and associated information from a received page; and to continue with the HO procedure (Step 5D) using the HO- related message and associated information received through the Paging channel.
  • the UE 10 may be in the Active state for Steps B and C, or it may transition to the IDLE state before beginning to listen to the Paging channel.
  • the exemplary embodiments of this invention in a further aspect thereof, provide a UE 10 resident computer program product that functions to perform a HO procedure by: initiating operation of a timer after the start of the HO procedure; and, in the event the timer expires before the UE 10 receives an expected HO-related message sent from a source eNB, to begin listening to a Paging channel of a current cell and, optionally, to Paging channel(s) of neighboring cell(s); to receive the expected HO-related message and associated information from a received page; and to continue with the HO procedure using the HO-related message and associated information received through the Paging channel.
  • the exemplary embodiments of this invention in still another aspect thereof, provide the UE 10 that is constructed to a perform HO procedure, and that includes a timer unit and a unit to initiate operation of the timer unit after the start of the HO procedure; where in the event the timer unit expires before the UE 10 receives an expected HO-related message sent from a source eNB, the UE 10 begins to receive a Paging channel of a current cell and, optionally, a Paging channel(s) of neighboring cell(s); to receive the expected HO-related message and associated information from a received page; and to continue with the HO procedure using the HO-related message and associated information received through the Paging channel.
  • Figure 6 there is illustrated in flow chart form a method for each of a base station, and a user equipment according to an exemplary embodiment of the invention.
  • Fig. 6A there is illustrated in a flow chart according to the invention a method of (610) starting a timer in a base station after sending a handover information message, and (615) stopping the timer upon a condition, comprising either receiving an expected handover related message; or expiration of a maximum allowed time value of the timer.
  • Fig. 6B there is illustrated in a flow chart according to the invention a method of (620) starting a timer in a user equipment after an initiation of a handover procedure, and (625) stopping the timer upon a condition, comprising either receiving an expected handover related message, or expiration of a maximum allowed time value of the timer, where at the expiration of the maximum allowed time value the user equipment begins listening for a page to obtain handover related information.
  • Fig. 7 there is illustrated in a flow chart a method for a base station according to a non-limiting exemplary embodiment of the invention.
  • the method there is (710) sending a handover related message to a user equipment from a base station, (720) starting a timer after sending the handover related message to the user equipment, and (730) in the event the timer expires before receiving an expected response from the user equipment to the handover related message, the base station initiating a communication to the user equipment on a page channel, where the communication includes information contained in the handover related message
  • the various exemplary embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • While various aspects of the exemplary embodiments of this invention may be illustrated and described as block diagrams, logic flow diagrams, message flow diagrams, or by using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

Selon des modes de réalisation représentatifs, la présente invention concerne de manière non limitative un procédé comprenant le démarrage d'un chronomètre dans une station de base suite à la transmission d'un message d'information de transfert, et l'arrêt du chronomètre selon une condition, comprenant soit la réception d'un message associé de transfert prévu, soit l'expiration d'un temps maximal alloué du chronomètre.
PCT/IB2007/002438 2006-08-25 2007-08-24 Appareil, procédé et progiciel assurant la robustesse améliorée de transfert en réseau e-utran avec radiomessagerie de l'équipement d'utilisateur actif WO2008023257A2 (fr)

Applications Claiming Priority (2)

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US84028306P 2006-08-25 2006-08-25
US60/840,283 2006-08-25

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WO2008023257A2 true WO2008023257A2 (fr) 2008-02-28
WO2008023257A3 WO2008023257A3 (fr) 2008-05-15

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010030953A1 (en) * 2000-04-12 2001-10-18 Samsung Electronics Co., Ltd. Method for providing concurrent service handoff in a mobile communication system
US20020045449A1 (en) * 2000-10-02 2002-04-18 Mamiko Oobayashi Mobile communication terminal apparatus, control circuit, and handoff control method
US20050037758A1 (en) * 2003-06-18 2005-02-17 Yoram Rimoni System and method for GSM hard handoff
US20060166672A1 (en) * 2005-01-22 2006-07-27 Samsung Electronics Co., Ltd. System and method for performing network re-entry in a communication system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010030953A1 (en) * 2000-04-12 2001-10-18 Samsung Electronics Co., Ltd. Method for providing concurrent service handoff in a mobile communication system
US20020045449A1 (en) * 2000-10-02 2002-04-18 Mamiko Oobayashi Mobile communication terminal apparatus, control circuit, and handoff control method
US20050037758A1 (en) * 2003-06-18 2005-02-17 Yoram Rimoni System and method for GSM hard handoff
US20060166672A1 (en) * 2005-01-22 2006-07-27 Samsung Electronics Co., Ltd. System and method for performing network re-entry in a communication system

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