WO2014179970A1 - Libération de connexion en cas de double connexion - Google Patents

Libération de connexion en cas de double connexion Download PDF

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Publication number
WO2014179970A1
WO2014179970A1 PCT/CN2013/075419 CN2013075419W WO2014179970A1 WO 2014179970 A1 WO2014179970 A1 WO 2014179970A1 CN 2013075419 W CN2013075419 W CN 2013075419W WO 2014179970 A1 WO2014179970 A1 WO 2014179970A1
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WO
WIPO (PCT)
Prior art keywords
base station
local area
user equipment
connection release
data transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2013/075419
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English (en)
Inventor
Jing HAN
Wei Bai
Pengfei Sun
Lili Zhang
Haiming Wang
Xinying Gao
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.)
Broadcom Corp
Original Assignee
Broadcom Corp
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.)
Filing date
Publication date
Application filed by Broadcom Corp filed Critical Broadcom Corp
Priority to PCT/CN2013/075419 priority Critical patent/WO2014179970A1/fr
Publication of WO2014179970A1 publication Critical patent/WO2014179970A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • connection release for dual connection relates to methods, apparatuses and a computer program product for connection release for dual connection.
  • Dual connection is a new emerged concept for LA network.
  • the basic idea is to let UE connect to macro eNB (MeNB) and Local Area eNB (LAeNB) simultaneously, so that macro eNB can control the mobility of the UE to avoid too many handover procedures/signalling when UE moving among different LA cells.
  • macro eNB can offload most of data transmission to LA cell so that UE can enjoy the high data rate in LA cell and very low transmission power due to small distance.
  • This concept is also called inter-eNB carrier aggregation (CA), user- control plane (U-C plane) split, multi-stream etc., and proposed by many companies during Rel-12 workshops (cf. documents [1], [2], and [3]).
  • Dual connection concept is a promising concept in Rel-12, and is expected to have hot discussion in LA study of 3GPP Rel-12 phase.
  • dual connection is a promising way forward for LA network.
  • macro eNB can control the UE's mobility to avoid too many handover procedures and potential radio link failure from LA connection.
  • UE can enjoy the high data rate and low transmission power in LA cell.
  • dual connection release may happen when e.g. dual connection is no longer suitable for high mobility UEs, or UE will move out of the coverage of LA cell etc.
  • LA eNB Radio Bearers
  • Radio Resource Control (RRC) connection release procedure and RRC connection reestablishment procedure, wherein both procedure can do the connection release.
  • RRC Radio Resource Control
  • connection release command can be sent to UE from another network node
  • the eNB sends the release command to UE
  • an apparatus for use in a first network element comprising:
  • the at least one memory and the computer program code arranged to, with the at least one processor, cause the apparatus at least to perform:
  • an apparatus for use in a user equipment comprising:
  • the at least one memory and the computer program code arranged to, with the at least one processor, cause the apparatus at least to perform:
  • an apparatus for use in a local area base station comprising:
  • At least one processor and at least one memory including computer program code,
  • the at least one memory and the computer program code arranged to, with the at least one processor, cause the apparatus at least to perform:
  • an apparatus for use in a first network element comprising:
  • an apparatus for use in a user equipment comprising:
  • an apparatus for use in a local area base station comprising:
  • a computer program product comprising computer-executable computer program code which, when the program is run on a computer (e.g. a computer of an apparatus according to any one of the aforementioned apparatus-related example versions of the present disclosure), is arranged to cause the computer to carry out the method according to any one of the aforementioned method- related example versions of the present disclosure.
  • Such computer program product may comprise or be embodied as a (tangible) computer-readable (storage) medium or the like on which the computer- executable computer program code is stored, and/or the program may be directly loadable into an internal memory of the computer or a processor thereof.
  • Fig. 1 is a signaling diagram illustrating a RRC connection reestablishment procedure
  • FIG. 2 is an overview illustrating a scenario to which certain versions of the present disclosure are applicable;
  • Fig. 3 is a signaling diagram illustrating an example of a method according to certain versions of the present disclosure;
  • Fig. 4 is a flowchart illustrating an example of a method according to certain versions of the present disclosure
  • Fig. 5 is a flowchart illustrating another example of a method according to certain versions of the present disclosure
  • Fig. 6 is a flowchart illustrating still another example of a method according to certain versions of the present disclosure
  • Fig. 7 is a block diagram illustrating an example of an apparatus according to certain versions of the present disclosure.
  • Example versions of the present disclosure will be described herein below. More specifically, example versions of the present disclosure are described hereinafter with reference to particular non-limiting examples and to what are presently considered to be conceivable versions of the present disclosure. A person skilled in the art will appreciate that the disclosure is by no means limited to these examples, and may be more broadly applied. It is to be noted that the following description of the present disclosure and its versions mainly refers to specifications being used as non-limiting examples for certain example network configurations and deployments. Namely, the present disclosure and its versions are mainly described in relation to 3GPP specifications being used as non-limiting examples for certain example network configurations and deployments.
  • a LTE/LTE- Advanced communication system and a (W)LAN system are used as a non-limiting example for the applicability of thus described example versions.
  • the description of example versions given herein specifically refers to terminology which is directly related thereto. Such terminology is only used in the context of the presented non-limiting examples, and does naturally not limit the disclosure in any way. Rather, any other network configuration or system deployment, etc. may also be utilized as long as compliant with the features described herein. That is, the present disclosure is applicable to any other cellular wide-area communication systems and wireless local-area communication systems.
  • Fig. 2 shows a scenario to which certain versions of the present disclosure are applicable. As shown in Fig. 2, such a scenario includes at least one macro eNB and at least one LAeNB, here one MeNB 11 and two LAeNBs 12 and 13 are shown. It is noted that the number of MeNBs and LAeNBs shown in Fig.
  • the LAeNBs 12 and 13 and the MeNB 11 are connected via a backhaul connection, like e.g. an X2 or new backhaul interface.
  • a user equipment UE 14 which has a dual connection to the MeNB and the LAeNB 13 in this specific example. It is obvious that there may be more than one UE and that the UE may be connected to any one of the LAeNBs.
  • ⁇ LA cell has RRC layer and functionality
  • UE has dual connection with MeNB and LA cell, i.e. one connection with MeNB and one connection with LA cell;
  • LA connection release procedure may be controlled by MeNB. In such a case,
  • LA cells that have backhaul connection with MeNB will be controlled;
  • Possible measurement procedure that support LA connection release is configured by MeNB, and measurement report from UE is sent to MeNB;
  • MeNB sends the LA connection release command to both UE and LAeNB.
  • the LAeNB/SGW may send traffic status indication to MeNB to indicate e.g. that the traffic on LA RBs comes to end, to help MeNB decision on LA connection release.
  • Such indication is sent via backhaul connection between LAeNB and MeNB, and such indication may be periodic or event triggered.
  • the LA connection release procedure may also be controlled by LAeNB, In this case
  • LAeNB sends the LA connection release command to both UE and MeNB.
  • LA connection release command could include the information e.g. EPS bearer ID, radio bearer ID, the indication of bearer release, the indication of bearer suspension, radio bearer/radio resource configuration etc.
  • EPS bearer ID e.g. EPS bearer ID
  • radio bearer ID e.g. EPS bearer ID
  • the indication of bearer release e.g. a release command
  • Such a release command may be a new message, an IE included in RRC connection re- establishment message or an IE included in handover message.
  • the UE behavior may be defined as follows:
  • both UE and LAeNB may not release the LA connection, but continue the data transmission on LA RBs until LAeNB send UE the indication for data ending; o This procedure could be configured to be enabled or disabled.
  • LA RB handling After LA connection is released, RBs originally in LA cell may be automatically setup by both UE and eNB in macro cell, with using the same configuration as in LA cell. For another example alternative, MeNB may setup backup bearers for LA RBs in macro cell beforehand and pending these backup RBs before LA connection release; and after LA connection is released, the UE and MeNB may continue the transmission on backup bearers. When UE has performed the LA connection release, UE will send the message to the MeNB irrespective of whether the LA connection release procedure is controlled by MeNB or LAeNB.
  • the message may be either the LA connection complete message to indicate the LA connection release procedure is complete, or the integrated indication to indicate that the UE is back to single connection mode from dual connection mode.
  • Such a message may contain the information of the reason of back to single connection mode, moved RB information e.g. which RB is moved from LA cell to Macro cell etc.
  • Fig. 3 a case is assumed where the MeNB controls the LA connection release procedure, as defined above. However, in a case where the LA connection release procedure would be controlled by the LAeNB, as described in the above alternative, corresponding signaling will be started / ended at the LAeNB. As shown in Fig.3, the whole LA connection release procedure may be as follows: It is noted that in Fig. 3, the solid lines indicate layer 3 signaling except for the step "UL allocation" within step S1, which is layer 1/layer 2 signaling. Further, the broken lines in Fig.3 indicate transmission of user data. As indicated by the broken lines between the UE and the LAeNB, Fig. 3 relates to a case where packet data for DRBs in LA cell are transmitted between the UE and the LAeNB.
  • step S1 possible measurement to support LA connection release is configured by MeNB, and the measurement report will be sent to MeNB.
  • the LA eNB may send traffic status indication to MeNB to indicate e.g. that the traffic on LA RBs ends, to help the MeNB to make the decision on LA connection release.
  • the MeNB makes the LA connection release decision for dual connection according to the input e.g. measurement results, traffic status etc. Then, in a step S3, the MeNB will send LA connection release command to both the UE and the LAeNB.
  • the LA connection release command could include the information e.g. EPS bearer ID, radio bearer ID, the indication of bearer release, the indication of bearer suspend, radio bearer/radio resource configuration etc.
  • steps S5 and S6 relate to the data transfer procedure.
  • the LAeNB may send SN status and transfer data to MeNB via e.g. X2 or new backhaul interface (choice 1 in Fig. 3).
  • LAeNB may continue to send the data to UE until the data ends (choice 2 in Fig. 3).
  • UE when UE receives the LA connection release command, it may do the following actions. According to an example choice 2 in Fig. 3, the UE finishes the data transmission on corresponding RBs via LA cell or macro cell. Before the UE releases the LA connection, LAeNB and UE should finish the data that already arrives in LAeNB so that these data do not need to be forwarded to MeNB. For example, when the UE received the LA connection release command, both UE and LAeNB do not release the LA connection, but continue the data transmission on LA RBs until the LAeNB sends the indication for data ending to the UE.
  • Such a procedure could be configured to be enabled or disabled.
  • the UE suspends/releases the corresponding RBs that are indicated in LA connection release command and updates security parameters for corresponding RBs that are indicated in LA connection release command, by using MeNB security parameters.
  • the UE applies the radio bearer/radio resource configuration that is indicated in LA connection release command and resumes packet transmission/reception of corresponding RBs that are indicated in LA connection release command in macro cell.
  • LA RB handling Originally in single connection case, when connection is released, corresponding RB will be also released. But here for dual connection, when LA connection is released, LA RBs may be automatically setup by both UE and eNB in macro cell, with using the same configuration as in LA cell. The non-limiting advantage here is to avoid the signaling procedure and delays to setup these RBs in macro cell, at meanwhile keep the continuous transmission for corresponding service that on LA RBs and minimize the interruption time for corresponding service during LA connection release. For another example alternative, MeNB may setup backup bearers for LA RBs in macro cell beforehand and pending these backup RBs before AL connection release; after LA connection is released, the UE and MeNB may continue the transmission on backup bearers.
  • the UE may send a LA connection release complete message to MeNB.
  • One message is needed for the release command to indicate to the MeNB when the UE is done for LA connection release, so that the corresponding LA RBs and services may be continued in the macro cell to avoid the long service interruptions or even service drop.
  • the content of the message is defined so as to be not restricted to only contain complete indication, but also the RB information that continues in macro cell, and also the message is a flag for the UE mode transition, i.e. from dual connection mode to single connection mode.
  • the MeNB and LAeNB may communicate with MME and SGW about the connection release in LA cell.
  • packet data for DRBs in LA cell are transmitted between the UE and the MeNB.
  • the release command may be flexibly determined and transmitted by MeNB. Since MeNB may have the information for all LA cells and MeNB may be the mobility anchor for UE, letting the MeNB control the LA connection release could minimize the service interruption for the UEs that are carried on LA cells.
  • Fig. 4 shows a principle flowchart of an example for a method according to certain versions of the present disclosure. That is, as shown in Fig. 4, this method for use in a first network element comprises making, at a first network element, a local area connection release decision in a step S41, and causing transmission of a local area connection release command to a user equipment and a second network element, wherein the user equipment is connected at the same time to both the first network element and the second network element in a step S42. According to certain versions of the present disclosure, the method further comprises configuring a measurement procedure that supports in making the local area connection release decision, and causing transmission of the configured measurement procedure to the user equipment.
  • the method further comprises receiving, at the first network element, a measurement report from the user equipment according to the configured measurement procedure, wherein the measurement report is taken into consideration when making the local area connection release decision.
  • the local area connection release command includes at least one of information on evolved packet system bearer identification, radio bearer identification, indication of bearer release, indication of bearer suspension, radio bearer configuration and radio resource configuration.
  • the local area connection release command is a separate message, an information element included in a radio resource control connection re-establishment message or an information element included in a handover message.
  • the first network element is a macro base station and the second network element is a local area base station and the user equipment communicates with the local are base station.
  • the method further comprises receiving, at the macro base station, traffic status indication from the local area base station.
  • the traffic status indication indicates that traffic on local area bearers comes to an end.
  • the traffic status indication is sent via a backhaul connection between the macro base station and the local area base station.
  • the traffic status indication is sent in a periodic manner or triggered by a predetermined event.
  • the method further comprises setting up, by the macro base station, a radio bearer, and after the connection between the user equipment and the local area base station is released, continuing data transmission with the user equipment on the bearer.
  • the method further comprises setting up, by the macro base station, a backup bearer, and after the connection between the user equipment and the local area base station is released, continuing data transmission with the user equipment on the backup bearer.
  • the first network element is a local area base station and the second network element is a macro base station and the user equipment communicates with the local are base station.
  • the method further comprises continuing the communication with user equipment, and causing transmission of an indication for end of data transmission to the user equipment.
  • Fig. 5 shows a principle flowchart of an example for a method according to certain versions of the present disclosure. That is, as shown in Fig. 5, this method for use in a user equipment comprises receiving, at a user equipment, which is connected to a macro base station and a local area base station at the same time and performs data transmission with the local area base station, a local area connection release command in a step S51, and continuing data transmission with the local area base station until receiving an indication for end of the data transmission from the local area base station in a step S52.
  • the method further comprises performing a local area connection release, causing transmission of a message indicating completion of the local area connection release to the macro base station, and continuing data transmission with the macro base station on a bearer setup by the macro base station.
  • the message further indicates that the user equipment has switched from a dual connection mode to a single connection mode.
  • the message further includes information indicating at least one of the reason for switching from the dual connection mode to the single connection mode and the radio bearers moved from local area cell to macro cell.
  • Fig. 6 shows a principle flowchart of another example for a method according to certain versions of the present disclosure. That is, as shown in Fig.
  • this method for use in a local area base station comprises receiving, at the local area base station performing data transmission with a user equipment, a connection release command from a macro base station in a step S61, continuing data transmission with the user equipment after receiving the connection release command from the macro base station in a step S62, and causing transmission of an indication for end of data transmission to the user equipment in a step S63.
  • the method further comprises causing transmission of traffic status indication to the macro base station.
  • the traffic status indication indicates that traffic on local area bearers comes to an end.
  • the traffic status indication is sent via a backhaul connection between the macro base station and the local area base station.
  • Fig. 7 is a block diagram illustrating an example of an apparatus according to certain versions of the present disclosure.
  • the apparatus 70 comprises at least one processor 71 and at least one memory 72 including computer program code, which are connected by a bus 74 or the like.
  • an interface 73 may optionally be connected to the bus 74 or the like, which may enable communication e.g. to/from another base station, user equipment, other network entity, or the like.
  • the apparatus may be part of a first network element or may be implemented in the first network element, and the at least one memory and the computer program code are arranged to, with the at least one processor, cause the apparatus at least to perform making a local area connection release decision, and causing transmission of a local area connection release command to a user equipment and a second network element, wherein the user equipment is connected at the same time to both the first network element and the second network element.
  • the apparatus may be part of a user equipment or may be implemented in the user equipment, and the at least one memory and the computer program code are arranged to, with the at least one processor, cause the apparatus at least to perform receiving, at the user equipment, which is connected to a macro base station and a local area base station at the same time and performs data transmission with the local area base station, a local area connection release command, and continuing data transmission with the local area base station until receiving an indication for end of the data transmission from the local area base station.
  • the user equipment may be a mobile phone, a personal digital assistant (PDA), a laptop computer, a tablet computer, or the like.
  • PDA personal digital assistant
  • the apparatus may be part of a local area base station or may be implemented in the local area base station, and the at least one memory and the computer program code are arranged to, with the at least one processor, cause the apparatus at least to perform receiving, at the local area base station performing data transmission with a user equipment , a connection release command from a macro base station, continuing data transmission with the user equipment after receiving the connection release command from the macro base station, and causing transmission of an indication for end of data transmission to the user equipment.
  • the apparatuses may comprise further units that are necessary for its respective operation as user equipment, network element or base station, respectively. However, a description of these units is omitted in this specification.
  • the arrangement of the functional blocks of the apparatuses is not construed to limit the disclosure, and the functions may be performed by one block or further split into sub-blocks.
  • the apparatuses i.e. the user equipment, network elements or base station, may be connected via a link 45.
  • the link 45 may be a physical and/or logical coupling, which is implementation-independent (e.g. wired or wireless) .
  • a system may comprise any conceivable combination of the thus depicted devices/ apparatuses and other network elements, which are arranged to cooperate as described above.
  • respective functional blocks or elements according to above-described versions may be implemented by any known means, either in hardware and/or software, respectively, if it is only adapted to perform the described functions of the respective parts.
  • the mentioned method steps may be realized in individual functional blocks or by individual devices, or one or more of the method steps may be realized in a single functional block or by a single device.
  • any procedural step or functionality is suitable to be implemented as software or by hardware without changing the idea of the present disclosure.
  • Such software may be software code independent and may be specified using any known or future developed programming language, such as e.g. Java, C+ + , C, and Assembler, as long as the functionality defined by the method steps is preserved.
  • Such hardware may be hardware type independent and may be implemented using any known or future developed hardware technology or any hybrids of these, such as MOS (Metal Oxide Semiconductor), CMOS (Complementary MOS), BiMOS (Bipolar MOS), BiCMOS (Bipolar CMOS), ECL (Emitter Coupled Logic), TTL (Transistor-Transistor Logic), etc., using for example ASIC (Application Specific IC (Integrated Circuit)) components, FPGA (Field-programmable Gate Arrays) components, CPLD (Complex Programmable Logic Device) components or DSP (Digital Signal Processor) components.
  • MOS Metal Oxide Semiconductor
  • CMOS Complementary MOS
  • BiMOS Bipolar MOS
  • BiCMOS BiCMOS
  • ECL Emitter Coupled Logic
  • TTL Transistor-Transistor Logic
  • ASIC Application Specific IC
  • FPGA Field-programmable Gate Arrays
  • CPLD Complex Programmable Logic Device
  • DSP
  • a device/ apparatus may be represented by a semiconductor chip, a chipset, system in package (SIP), or a (hardware) module comprising such chip or chipset; this, however, does not exclude the possibility that a functionality of a device/ apparatus or module, instead of being hardware implemented, be implemented as software in a (software) module such as a computer program or a computer program product comprising executable software code portions for execution/being run on a processor.
  • a device may be regarded as a device/ apparatus or as an assembly of more than one device/ apparatus, whether functionally in cooperation with each other or functionally independently of each other but in a same device housing, for example.
  • Apparatuses and/or means or parts thereof may be implemented as individual devices, but this does not exclude that they may be implemented in a distributed fashion throughout the system, as long as the functionality of the device is preserved. Such and similar principles are to be considered as known to a skilled person.
  • Software in the sense of the present description comprises software code as such comprising code means or portions or a computer program or a computer program product for performing the respective functions, as well as software (or a computer program or a computer program product) embodied on a tangible medium such as a computer-readable (storage) medium having stored thereon a respective data structure or code means/portions or embodied in a signal or in a chip, potentially during processing thereof.
  • a tangible medium such as a computer-readable (storage) medium having stored thereon a respective data structure or code means/portions or embodied in a signal or in a chip, potentially during processing thereof.
  • the present disclosure also covers any conceivable combination of method steps and operations described above, and any conceivable combination of nodes, apparatuses, modules or elements described above, as long as the above- described concepts of methodology and structural arrangement are applicable.

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

Abstract

La présente invention concerne des procédés, des appareils et un produit programme d'ordinateur pour une libération de connexion en cas de double connexion. La présente invention consiste à prendre, à un premier élément de réseau, une décision de libération de connexion locale, et à transmettre une commande de libération de connexion locale, à un équipement d'utilisateur et à un second élément de réseau, l'équipement d'utilisateur étant connecté en même temps au premier élément de réseau et au second élément de réseau.
PCT/CN2013/075419 2013-05-09 2013-05-09 Libération de connexion en cas de double connexion Ceased WO2014179970A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/CN2013/075419 WO2014179970A1 (fr) 2013-05-09 2013-05-09 Libération de connexion en cas de double connexion

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PCT/CN2013/075419 WO2014179970A1 (fr) 2013-05-09 2013-05-09 Libération de connexion en cas de double connexion

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010030099A2 (fr) * 2008-09-09 2010-03-18 Samsung Electronics Co., Ltd. Procédé de relocalisation d’utilisateur déclenché par une passerelle de nœud local b
CN102118807A (zh) * 2011-01-18 2011-07-06 大唐移动通信设备有限公司 直接通路的拆除方法及其系统、家庭基站和本地网关

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010030099A2 (fr) * 2008-09-09 2010-03-18 Samsung Electronics Co., Ltd. Procédé de relocalisation d’utilisateur déclenché par une passerelle de nœud local b
CN102118807A (zh) * 2011-01-18 2011-07-06 大唐移动通信设备有限公司 直接通路的拆除方法及其系统、家庭基站和本地网关

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"Discussion about Dual Connectivity", 3GPP TSG-RAN WG2 MEETING #81 R2-130400, 1 February 2013 (2013-02-01), Retrieved from the Internet <URL:http.//www.3gpp.org/ftp/TSG_RAN/WG2_RL2/TSGR2_81/Docs/R2-130400.zip> *
"Mobility for Dual Connectivity", 3GPP T SG RAN WG2 MEETING #81BIS R2-130990, 19 April 2013 (2013-04-19), Retrieved from the Internet <URL:http://www.3gpp.org/ftp/TSGRAN/WG2RL2/TSGR281bis/Docs/R2-130990.zip> *
"Small Cell Challenges and Benefits of Dual Connectivity", 3GPP TSG-RAN WG2 #81 T DOC R2-130416, 1 February 2013 (2013-02-01), Retrieved from the Internet <URL:http.//www.3gpp.org/ftp/TSG_RAN/WG2_RL2/TSGR2_81/Docs/R2-130416.zir> *

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