WO2014161197A1 - Interworking between a wireless wide-area communication system and a wireless local-area communication system - Google Patents

Interworking between a wireless wide-area communication system and a wireless local-area communication system Download PDF

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Publication number
WO2014161197A1
WO2014161197A1 PCT/CN2013/073755 CN2013073755W WO2014161197A1 WO 2014161197 A1 WO2014161197 A1 WO 2014161197A1 CN 2013073755 W CN2013073755 W CN 2013073755W WO 2014161197 A1 WO2014161197 A1 WO 2014161197A1
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WIPO (PCT)
Prior art keywords
base station
message
communication system
area communication
user equipment
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Application number
PCT/CN2013/073755
Other languages
French (fr)
Inventor
Wei Hong
Haiming Wang
Na WEI
Erlin Zeng
Original Assignee
Broadcom Corporation
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Filing date
Publication date
Application filed by Broadcom Corporation filed Critical Broadcom Corporation
Priority to PCT/CN2013/073755 priority Critical patent/WO2014161197A1/en
Publication of WO2014161197A1 publication Critical patent/WO2014161197A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1446—Reselecting a network or an air interface over a different radio air interface technology wherein at least one of the networks is unlicensed

Definitions

  • the present invention relates to interworking between a wireless wide-area communication system and a wireless local-area communication system, and more particularly, relates to methods, apparatuses and a computer program product for interworking procedures and signaling between a wireless wide-area communication system and a wireless local-area communication system.
  • the ISM (industrial, scientific and medical) radio bands are license-exempt bands, which were originally reserved internationally for the use of radio frequency (RF) energy for industrial, scientific and medical purposes other than communications.
  • RF radio frequency
  • these bands have also been shared with license-free error-tolerant communications applications such as Wireless local area networks (WLAN) and cordless phones in the 915 MHz, 2.450 GHz, and 5.800 GHz bands.
  • WLAN Wireless local area networks
  • a main usage on these ISM bands is 'WiFi'.
  • WLAN wireless local area network
  • IEEE 802.11 IEEE 802.11 standard
  • ISM band 2.4 GHz WiFi 802.11b and 802.11g/n
  • WLAN is integrated as a separate access network to the 3GPP EPC (3 rd Generation Partnership Project Evolved Packet Core). This requires extra cost of deploying the complete WLAN access network and also impacts the 3GPP core network entities.
  • Existing WiFi offload solutions are based on this deployment model of distinct 3GPP and WLAN access networks using a common core with selective switching of flows based on operator/user policies. Other solutions are possible that result in a tighter integration and aggregation of 3GPP access network components with WLAN access networks without any impact to and reusing the same 3GPP core network elements.
  • RP-111094 "Discussions on Carrier Aggregation across LTE and WiFi", Intel, RAN#53, December 2011 ;
  • RP- 111104 "Radio Level Dynamic Flow Switching between 3GPP-LTE and WLAN”, Intel, RAN#53, December 2011 ;
  • a method comprising composing, by a base station, a message including information indicating an interworking capability of the base station between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to user equipment.
  • a method comprising composing, by a user equipment, a message including information indicating an interworking capability of the user equipment between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to a base station.
  • a method comprising composing, by a base station, a message including information about at least one access point of a wireless local-area communication system and causing transmission/broadcast of the message to user equipment.
  • a method comprising composing, by a base station, a message including information indicating an interworking capability of user equipment between a wireless wide-area communication system and a wireless local-area communication system, the user equipment being connected to the base station, and causing transmission of the message to another base station.
  • a base station comprising:
  • the at least one memory and the computer program code arranged to, with the at least one processor, cause the base station at least to perform:
  • a user equipment comprising:
  • the at least one memory and the computer program code arranged to, with the at least one processor, cause the user equipment at least to perform:
  • a base station 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:
  • a base station 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:
  • composing a message including information indicating an interworking capability of user equipment between a wireless wide-area communication system and a wireless local-area communication system, the user equipment being connected to the base station, and causing transmission of the message to another base station.
  • an apparatus comprising means for composing a message including information indicating an interworking capability of the apparatus between a wireless wide-area communication system and a wireless local-area communication system, and means for causing transmission of the message to user equipment.
  • an apparatus comprising means for composing a message including information indicating an interworking capability of the apparatus between a wireless wide-area communication system and a wireless local-area communication system, and means for causing transmission of the message to a base station.
  • an apparatus comprising means for composing a message including information about at least one access point of a wireless local-area communication system, and means for causing transmission of the message to user equipment.
  • an apparatus comprising means for composing a message including information indicating an interworking capability of user equipment between a wireless wide-area communication system and a wireless local-area communication system, the user equipment being connected to the base station, and means for causing transmission of the message to another base station.
  • 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 exemplary aspects of the present invention), is arranged to cause the computer to carry out the method according to any one of the aforementioned method- related exemplary aspects of the present invention.
  • a computer e.g. a computer of an apparatus according to any one of the aforementioned apparatus-related exemplary aspects of the present invention
  • 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 an overview illustrating a scenario for LTE and WiFi interworking to which the present invention is applicable;
  • Fig. 2 is a flowchart illustrating an example of a method according to certain embodiments of the present invention
  • Fig. 3 is a block diagram illustrating an example of a user equipment according to certain embodiments of the present invention.
  • Fig.4 is a flowchart illustrating another example of a method according to certain embodiments of the present invention.
  • Fig. 5 is a flowchart illustrating still another example of a method according to certain embodiments of the present invention
  • Fig. 6 is a flowchart illustrating still another example of a method according to certain embodiments of the present invention.
  • Fig. 7 is a block diagram illustrating an example of a base station according to certain embodiments of the present invention.
  • a LTE/LTE- Advanced communication system and a WLAN system are used as a non-limiting example for the applicability of thus described exemplary embodiments.
  • the description of exemplary embodiments 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 invention 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 invention is applicable to any other wireless wide-area communication systems and wireless local-area communication systems.
  • a specific example for the wireless wide-area communication system a cellular wide-area communication system, like e.g. LTE/LTE-A is mentioned, and as a specific example of the wireless local-area communication system, a WLAN system is mentioned. That is, the present invention is described with respect to such a wireless wide-area communication system and wireless local-area communication system, as a specific example.
  • the present invention does not only apply to LTE/WLAN interworking but also applies to other type of interworking as long as it is wireless wide-area communication system and wireless local-area communication system interworking.
  • the present invention may relates to interworking between a LTE macro cell and a LTE small cell.
  • WLAN/3GPP radio interworking is the enhancements to access network mobility and selection with better operator control.
  • the LTE eNBs need to collect information on WLAN access points (APs) (inc. static setting or dynamic information such as upgrade on version, load status, etc) in an efficient manner. So the necessary procedures and signaling are critical to make it practical and more efficient, which is what is addressed in certain aspects of the present invention.
  • APs WLAN access points
  • eNB wants to offload the UE's traffic to WLAN
  • both eNB and UE should make sure that such LTE/WLAN interworking capability is supported in both sides as well as during handover (HO) by reporting this in new defined or modified signaling. After confirming this capability, UE should be aware of related WLAN AP information in order to be offloaded and since eNB controls the WLAN APs, it could broadcast AP's information so that UE will obtain necessary WLAN information efficiently.
  • the eNB broadcasts its new LTE/WLAN interworking capability in modified Master Information Block (MIB) / System Information Block (SIB) or in a new SIB so that UE could (re)select this eNB when cell (re)selection is performed and request/perform LTE offloading to this eNB when necessary.
  • MIB Master Information Block
  • SIB System Information Block
  • the eNB informs the UE about its LTE/WLAN interworking capability using dedicated radio resource control (RRC) signaling during RRC establishment, e.g. in modified RadioResourceConfigDedicated included in RRCConnectionSetup message.
  • RRC radio resource control
  • the eNB broadcasts information of the APs in a modified SIB or a new SIB to enhance the efficiency and UE could use it to (re)select APs.
  • new cell (re)selection rules are proposed for the UE by taking eNB's LTE/WLAN interworking capability into account. That is, if a cell has LTE/WLAN interworking capability and its reception (RX) level is lower than the strongest cell within an offset, which could be predefined, then the UE should (re)select this cell.
  • the UE's new LTE/WLAN interworking capability and/or related WLAN parameters are reported to E- UTRAN so that eNB could know this UE supports LTE/WLAN interworking and could offload its traffic to WLAN, if necessary, using UE's WLAN parameters.
  • both eNB and UE's new LTE/WLAN interworking capability may be exchanged among eNBs via backhaul such as X2 or S1, e.g. when a handover (HO) is performed between a source eNB and a target eNB.
  • backhaul such as X2 or S1
  • HO handover
  • Fig. 1 is a diagram illustrating a scenario to which the present invention is applicable.
  • Fig. 1 shows three base stations eNB1, eNB2 and eNB3 and three WLAN access points AP1 , AP2, and AP3 controlled by eNB1 as well as several UEs UE1 to UE6.
  • the eNB broadcasts its LTE/WLAN interworking capability in a modified SIB1 to indicate its LTE/WLAN interworking capability.
  • UE1 has LTE/WLAN interworking capability.
  • IDLE mode after receiving the broadcasts form the eNBs, it finds out that eNB1 has LTE/WLAN interworking capability and eNB2 does not have LTE/WLAN interworking capability.
  • the RX level difference between eNB1 and eNB2 is within a predefined threshold, then UE1 will select eNB1 to access. Further, while accessing to eNB1 , the UE1 will report its LTE/WLAN interworking capability, e.g. in UE- EUTRA- Capability to the eNB1.
  • the eNB1 will also broadcast information about its controlled WLAN APs in a new SIB14, which, for example, may include information about versions, locations, working channels, MAC addresses and etc of AP1 , AP2 and AP3.
  • the eNB1 if the eNB1 should handover UE1 to eNB2 due to mobility of the UE1 , the eNB1 will indicate the LTE/WLAN capability of the UE1 to the eNB2, e.g. in HANDOVER REQUEST message so that the eNB2 is aware of the LTE/WLAN interworking capability of the UE1.
  • the LTE/WLAN interworking capability may be indicated in a new SIB1 message or as a new IE in a SIB3 message.
  • the UE's LTE/WLAN interworking capability and/or related WLAN parameters are reported to E-UTRAN in the IE UE-EUTRA- Capability.
  • the IE System I nformationBlockTypel 4 contains information about the APs controlled by the eNB.
  • the following HANDOVER REQUEST message is sent by the source eNB to the target eNB to request the preparation of resources for a handover.
  • Fig. 2 shows a principle flowchart of an example for a method according to certain embodiments of the present invention. That is, as shown in Fig. 2, this method for use in a user equipment comprises composing, by the user equipment, in a step S21, a message including information indicating an interworking capability of the user equipment between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to a base station in a step S22.
  • the information is included in an information element in a master information block or a system information block.
  • the information is included in radio resource control signaling during radio resource control establishment, and more particularly, the information is included in a radio resource control connection setup message.
  • Fig. 3 shows a principle configuration of an example for user equipment according to certain embodiments of the present invention.
  • the user equipment 30 comprises at least one processor 31 and at least one memory 32 including computer program code, which are connected by a bus 34 or the like.
  • an interface 33 may optionally be connected to the bus 34 or the like, which may enable communication e.g. to/from a base station, a network entity, or the like.
  • the at least one memory and the computer program code are arranged to, with the at least one processor, cause the user equipment at least to perform composing a message including information indicating an interworking capability of the user equipment between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to a base station.
  • a message including information indicating an interworking capability of the user equipment between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to a base station.
  • this method for use in a base station comprises composing, in a step S41, a message including information indicating an interworking capability of the base station between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to user equipment in a step S42.
  • the information is included in an information element in a master information block or a system information block, or the information is included in radio resource control signaling during radio resource control establishment.
  • the information is included in a radio resource control connection setup message.
  • the message additionally includes rules for the user equipment to take the interworking capability of the base station into account in a cell selection process.
  • the rules instruct the user equipment to select a cell served by a base station that has interworking capability and the reception level of which is lower than a predetermined threshold.
  • Fig. 5 shows a principle flowchart of another example for a method according to certain embodiments of the present invention. That is, as shown in Fig. 5, this method for use in a base station comprises composing, in a step S51, a message including information about at least one access point of a wireless local-area communication system and, and causing transmission/broadcast of the message to user equipment in a step S52.
  • the information is included in an information element in a system information block, and the information includes at least one of version information, load status, location, working channel, and medium access control address of the access point.
  • the access point is an access point controlled by the base station, an access point controlled by a neighbor base station to the base station, and/or an operator shared access point.
  • Fig. 6 shows a principle flowchart of another example for a method according to certain embodiments of the present invention. That is, as shown in Fig. 6, this method for use in a base station comprises composing, in a step S61, a message including information indicating an interworking capability of user equipment between a wireless wide-area communication system and a wireless local-area communication system, the user equipment being connected to the base station, and causing transmission of the message to another base station in a step S62.
  • the message additionally includes information indicating an interworking capability of the base station between a wireless wide-area communication system and a wireless local-area communication system.
  • the message is included in X2 setup request message or a handover request message and transmitted over X2 interface or S1 interface.
  • Fig. 7 shows a principle configuration of an example for a base station according to certain embodiments of the present invention.
  • the base station 70 comprises at least one processor 41 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.
  • the at least one memory and the computer program code are arranged to, with the at least one processor, cause the base station at least to perform composing a message including information indicating an interworking capability of the base station between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to user equipment.
  • the at least one memory and the computer program code are arranged to, with the at least one processor, cause the base station at least to perform composing a message including information about at least one access point of a wireless local-area communication system, and causing transmission/broadcast of the message to user equipment. Furthermore, the at least one memory and the computer program code are arranged to, with the at least one processor, cause the base station at least to perform composing a message including information indicating an interworking capability of user equipment between a wireless wide-area communication system and a wireless local-area communication system, the user equipment being connected to the base station, and causing transmission of the message to another base station.
  • the apparatuses i.e. the user equipment or base station (or part of the user equipment or base station) only the units that are relevant for understanding the principles of the invention have been described using functional blocks.
  • the apparatuses may comprise further units that are necessary for its respective operation as user equipment 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 invention, and the functions may be performed by one block or further split into sub-blocks.
  • the apparatuses i.e. the user equipment or base station, may be connected via links 35/75.
  • the links 35/75 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 aspects can 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 can be realized in individual functional blocks or by individual devices, or one or more of the method steps can 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 invention.
  • Such software may be software code independent and can 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 can 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 can 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.
  • the present invention 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.

Abstract

The present invention relates to methods, apparatuses and a computer program product for interworking between a wireless wide-area communication system and a wireless local-area communication system. The present invention includes composing, by a base station, a message including information indicating an interworking capability of the base station between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to user equipment. Further, the present invention includes composing, by a user equipment, a message including information indicating an interworking capability of the user equipment between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to a base station.

Description

UNDERWORKING BETWEEN A WIRELESS WIDE-AREA COMMUNICATION SYSTEM AND A WIRELESS LOCAL-AREA COMMUNICATION SYSTEM
Field of the invention
The present invention relates to interworking between a wireless wide-area communication system and a wireless local-area communication system, and more particularly, relates to methods, apparatuses and a computer program product for interworking procedures and signaling between a wireless wide-area communication system and a wireless local-area communication system.
Background
The ISM (industrial, scientific and medical) radio bands are license-exempt bands, which were originally reserved internationally for the use of radio frequency (RF) energy for industrial, scientific and medical purposes other than communications. However, in recent years these bands have also been shared with license-free error-tolerant communications applications such as Wireless local area networks (WLAN) and cordless phones in the 915 MHz, 2.450 GHz, and 5.800 GHz bands. A main usage on these ISM bands is 'WiFi'.
'WiFi' is not a technical term. However, the WiFi Alliance has generally enforced its use to describe only a narrow range of connectivity technologies including wireless local area network (WLAN) based on the IEEE 802.11 standard, which is a set of standards carrying out WLAN communication in the 2.4, 3.6 and 5 GHz frequency bands (cf. document [1]).
• ISM band 2.4 GHz (WiFi 802.11b and 802.11g/n)
· ISM band 5 GHz (WiFi 802.11a/n/ac)
Recent growth in data traffic driven by mobile applications on smart phone devices, tablets, etc. has continued to strain the capacity of today's networks. Therefore, network operators are increasingly utilizing un-licensed WiFi spectrum to cope with such network congestion, and this trend is expected to accelerate further as traffic demand continues to grow.
Use of unlicensed spectrum is a cost-effective mean to add the needed capacity of today's networks, given the limited availability and high cost of licensed spectrum. Currently, WLAN is integrated as a separate access network to the 3GPP EPC (3rd Generation Partnership Project Evolved Packet Core). This requires extra cost of deploying the complete WLAN access network and also impacts the 3GPP core network entities. Existing WiFi offload solutions are based on this deployment model of distinct 3GPP and WLAN access networks using a common core with selective switching of flows based on operator/user policies. Other solutions are possible that result in a tighter integration and aggregation of 3GPP access network components with WLAN access networks without any impact to and reusing the same 3GPP core network elements.
It was firstly proposed in a discussion paper and Study Item (SI) proposal in RAN#53 (cf. documents [2] and [3]), which propose that the study may involve extending the same design principles already defined for carrier aggregation to support aggregation/coordination of cells/ carriers across Wide and Local Area Networks as well.
A new SI proposal has been approved in 3GPP RAN#58 named "WLAN/3GPP Radio I nterworking" (cf. document [4]). The objectives of the study are to evaluate LTE-WLAN and UTRA-WLAN interworking procedures addressing the issues above while improving seamless and non-seamless mobility.
References:
[1] IEEE Std.802.11 TM - 2007, "WLAN MAC and PHY Specifications";
[2] RP-111094, "Discussions on Carrier Aggregation across LTE and WiFi", Intel, RAN#53, December 2011 ; [3] RP- 111104, "Radio Level Dynamic Flow Switching between 3GPP-LTE and WLAN", Intel, RAN#53, December 2011 ;
[4] RP-121780, "WLAN/3GPP Radio Interworking", Intel, RAN#58, December 2012;
[5] 3GPPTS 36.331, V11.2.0, December 2012. Summary of the invention
According to exemplary aspects of the present invention, there are provided methods, apparatuses and a computer program product for interworking between a wireless wide-area communication system and a wireless local-area communication system.
Various aspects of exemplary embodiments of the present invention are set out in the appended claims.
According to an exemplary aspect of the present invention, there is provided a method comprising composing, by a base station, a message including information indicating an interworking capability of the base station between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to user equipment.
According to another exemplary aspect of the present invention, there is provided a method comprising composing, by a user equipment, a message including information indicating an interworking capability of the user equipment between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to a base station.
According to another exemplary aspect of the present invention, there is provided a method comprising composing, by a base station, a message including information about at least one access point of a wireless local-area communication system and causing transmission/broadcast of the message to user equipment. According to another exemplary aspect of the present invention, there is provided a method comprising composing, by a base station, a message including information indicating an interworking capability of user equipment between a wireless wide-area communication system and a wireless local-area communication system, the user equipment being connected to the base station, and causing transmission of the message to another base station.
According to another exemplary aspect of the present invention, there is provided a 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 base station at least to perform:
composing a message including information indicating an interworking capability of the base station between a wireless wide-area communication system and a wireless local-area communication system, and
causing transmission of the message to user equipment.
According to another exemplary aspect of the present invention, there is provided a user equipment, 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 user equipment at least to perform:
composing a message including information indicating an interworking capability of the user equipment between a wireless wide-area communication system and a wireless local-area communication system, and
causing transmission of the message to a base station. According to another exemplary aspect of the present invention, there is provided a 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:
composing a message including information about at least one access point of a wireless local-area communication system, and
causing transmission/broadcast of the message to user equipment.
According to another exemplary aspect of the present invention, there is provided a 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:
composing a message including information indicating an interworking capability of user equipment between a wireless wide-area communication system and a wireless local-area communication system, the user equipment being connected to the base station, and causing transmission of the message to another base station.
According to another exemplary aspect of the present invention, there is provided an apparatus comprising means for composing a message including information indicating an interworking capability of the apparatus between a wireless wide-area communication system and a wireless local-area communication system, and means for causing transmission of the message to user equipment. According to another exemplary aspect of the present invention, there is provided an apparatus comprising means for composing a message including information indicating an interworking capability of the apparatus between a wireless wide-area communication system and a wireless local-area communication system, and means for causing transmission of the message to a base station.
According to another exemplary aspect of the present invention, there is provided an apparatus comprising means for composing a message including information about at least one access point of a wireless local-area communication system, and means for causing transmission of the message to user equipment. According to another exemplary aspect of the present invention, there is provided an apparatus comprising means for composing a message including information indicating an interworking capability of user equipment between a wireless wide-area communication system and a wireless local-area communication system, the user equipment being connected to the base station, and means for causing transmission of the message to another base station.
According to an exemplary aspect of the present invention, there is provided 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 exemplary aspects of the present invention), is arranged to cause the computer to carry out the method according to any one of the aforementioned method- related exemplary aspects of the present invention. 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. Advantageous further developments or modifications of the aforementioned exemplary aspects of the present invention are set out in the dependent claims.
Brief Description of the Drawings For a more complete understanding of exemplary embodiments of the present invention, reference is now made to the following description taken in connection with the accompanying drawings in which: Fig. 1 is an overview illustrating a scenario for LTE and WiFi interworking to which the present invention is applicable;
Fig. 2 is a flowchart illustrating an example of a method according to certain embodiments of the present invention;
Fig. 3 is a block diagram illustrating an example of a user equipment according to certain embodiments of the present invention.
Fig.4 is a flowchart illustrating another example of a method according to certain embodiments of the present invention;
Fig. 5 is a flowchart illustrating still another example of a method according to certain embodiments of the present invention; Fig. 6 is a flowchart illustrating still another example of a method according to certain embodiments of the present invention;
Fig. 7 is a block diagram illustrating an example of a base station according to certain embodiments of the present invention.
Description of exemplary embodiments
Exemplary aspects of the present invention will be described herein below. More specifically, exemplary aspects of the present are described hereinafter with reference to particular non-limiting examples and to what are presently considered to be conceivable embodiments of the present invention. A person skilled in the art will appreciate that the invention 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 invention and its embodiments mainly refers to specifications being used as non-limiting examples for certain exemplary network configurations and deployments. Namely, the present invention and its embodiments are mainly described in relation to 3GPP specifications being used as non-limiting examples for certain exemplary network configurations and deployments. In particular, a LTE/LTE- Advanced communication system and a WLAN system are used as a non-limiting example for the applicability of thus described exemplary embodiments. As such, the description of exemplary embodiments 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 invention 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 invention is applicable to any other wireless wide-area communication systems and wireless local-area communication systems.
As described above, a specific example for the wireless wide-area communication system, a cellular wide-area communication system, like e.g. LTE/LTE-A is mentioned, and as a specific example of the wireless local-area communication system, a WLAN system is mentioned. That is, the present invention is described with respect to such a wireless wide-area communication system and wireless local-area communication system, as a specific example. However, it is noted that the present invention does not only apply to LTE/WLAN interworking but also applies to other type of interworking as long as it is wireless wide-area communication system and wireless local-area communication system interworking. For example, the present invention may relates to interworking between a LTE macro cell and a LTE small cell.
One objective of this WLAN/3GPP radio interworking is the enhancements to access network mobility and selection with better operator control. To support better control, the LTE eNBs need to collect information on WLAN access points (APs) (inc. static setting or dynamic information such as upgrade on version, load status, etc) in an efficient manner. So the necessary procedures and signaling are critical to make it practical and more efficient, which is what is addressed in certain aspects of the present invention. If eNB wants to offload the UE's traffic to WLAN, both eNB and UE should make sure that such LTE/WLAN interworking capability is supported in both sides as well as during handover (HO) by reporting this in new defined or modified signaling. After confirming this capability, UE should be aware of related WLAN AP information in order to be offloaded and since eNB controls the WLAN APs, it could broadcast AP's information so that UE will obtain necessary WLAN information efficiently.
Thus, according to certain aspects of the present invention, it is proposed that the eNB broadcasts its new LTE/WLAN interworking capability in modified Master Information Block (MIB) / System Information Block (SIB) or in a new SIB so that UE could (re)select this eNB when cell (re)selection is performed and request/perform LTE offloading to this eNB when necessary.
According to a further aspect of the present invention, the eNB informs the UE about its LTE/WLAN interworking capability using dedicated radio resource control (RRC) signaling during RRC establishment, e.g. in modified RadioResourceConfigDedicated included in RRCConnectionSetup message.
Further, according to another aspect of the resent invention, the eNB broadcasts information of the APs in a modified SIB or a new SIB to enhance the efficiency and UE could use it to (re)select APs.
According to certain aspects of the present invention, it is proposed to add a new information element (IE) in SIB3, SIB4, SIB5, SIB6, SIB7 or SIB8 to control whether UE's reselection should take eNB's LTE/WLAN interworking capability into account and related threshold, as described below in connection with a specific example. According to another aspect of the present invention, new cell (re)selection rules are proposed for the UE by taking eNB's LTE/WLAN interworking capability into account. That is, if a cell has LTE/WLAN interworking capability and its reception (RX) level is lower than the strongest cell within an offset, which could be predefined, then the UE should (re)select this cell.
According to another aspect of the present invention, the UE's new LTE/WLAN interworking capability and/or related WLAN parameters are reported to E- UTRAN so that eNB could know this UE supports LTE/WLAN interworking and could offload its traffic to WLAN, if necessary, using UE's WLAN parameters.
Further, according to another aspect of the present invention, both eNB and UE's new LTE/WLAN interworking capability may be exchanged among eNBs via backhaul such as X2 or S1, e.g. when a handover (HO) is performed between a source eNB and a target eNB.
In the following a specific example will be illustrated for explanatory purposes. It is noted that the present invention is not limited to the specific example.
Fig. 1 is a diagram illustrating a scenario to which the present invention is applicable. Fig. 1 shows three base stations eNB1, eNB2 and eNB3 and three WLAN access points AP1 , AP2, and AP3 controlled by eNB1 as well as several UEs UE1 to UE6.
First, the eNB broadcasts its LTE/WLAN interworking capability in a modified SIB1 to indicate its LTE/WLAN interworking capability.
Here, it is assumed that UE1 has LTE/WLAN interworking capability. Then, when the UE1 is in IDLE mode, after receiving the broadcasts form the eNBs, it finds out that eNB1 has LTE/WLAN interworking capability and eNB2 does not have LTE/WLAN interworking capability. Meanwhile, the RX level difference between eNB1 and eNB2 is within a predefined threshold, then UE1 will select eNB1 to access. Further, while accessing to eNB1 , the UE1 will report its LTE/WLAN interworking capability, e.g. in UE- EUTRA- Capability to the eNB1. The eNB1 will also broadcast information about its controlled WLAN APs in a new SIB14, which, for example, may include information about versions, locations, working channels, MAC addresses and etc of AP1 , AP2 and AP3.
Further, if the eNB1 should handover UE1 to eNB2 due to mobility of the UE1 , the eNB1 will indicate the LTE/WLAN capability of the UE1 to the eNB2, e.g. in HANDOVER REQUEST message so that the eNB2 is aware of the LTE/WLAN interworking capability of the UE1.
In the following some specific examples of information elements to be included in particular system information blocks or new system information blocks are described wherein the newly added lEs are indicated using italic font (based on document [5]).
For example, the LTE/WLAN interworking capability may be indicated in a new SIB1 message or as a new IE in a SIB3 message.
System I nformationBlockTypel message
Figure imgf000012_0001
lnformationBlockType3 message
:::::::::::¾¾:ϊί:ί¾
!!!!!!!!!!ii!!ii!iiiiiiiiii
I!!!!!!!!!!!!!!!!!!!!
v mm t.
Figure imgf000013_0001
The UE's LTE/WLAN interworking capability and/or related WLAN parameters are reported to E-UTRAN in the IE UE-EUTRA- Capability.
UE-EUTRA- Capability information element
1111111111111111111111111111111
Further, the IE System I nformationBlockTypel 4 contains information about the APs controlled by the eNB.
SystemlnformationBlockType14 information element
Figure imgf000013_0002
Figure imgf000014_0001
The following HANDOVER REQUEST message is sent by the source eNB to the target eNB to request the preparation of resources for a handover.
Figure imgf000015_0001
In view of the above, it is an advantage of the present invention that it can provide efficient access network mobility and selection for WLAN/3GPP interworking. It is another advantage of the present invention that it can let eNB and UE be aware of each other's LTE/WLAN interworking capability efficiently and also to facilitate this new function efficiently.
Fig. 2 shows a principle flowchart of an example for a method according to certain embodiments of the present invention. That is, as shown in Fig. 2, this method for use in a user equipment comprises composing, by the user equipment, in a step S21, a message including information indicating an interworking capability of the user equipment between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to a base station in a step S22.
According to certain aspects of the present invention, the information is included in an information element in a master information block or a system information block.
According to certain aspects of the present invention, the information is included in radio resource control signaling during radio resource control establishment, and more particularly, the information is included in a radio resource control connection setup message.
According to certain aspects of the present invention, the information is included in an UE-EUTRA-Capability message transmitted from the user equipment to the base station. Fig. 3 shows a principle configuration of an example for user equipment according to certain embodiments of the present invention. The user equipment 30 comprises at least one processor 31 and at least one memory 32 including computer program code, which are connected by a bus 34 or the like. As indicated with a dashed line in Fig. 3, an interface 33 may optionally be connected to the bus 34 or the like, which may enable communication e.g. to/from a base station, a network entity, or the like. The at least one memory and the computer program code are arranged to, with the at least one processor, cause the user equipment at least to perform composing a message including information indicating an interworking capability of the user equipment between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to a base station. For further functions of the user equipment, according to further exemplary embodiments of the present invention, reference is made to the above description of methods according to certain embodiments of the present invention, as described in connection with Fig. 2. Fig. 4 shows a principle flowchart of another example for a method according to certain embodiments of the present invention. That is, as shown in Fig. 4, this method for use in a base station comprises composing, in a step S41, a message including information indicating an interworking capability of the base station between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to user equipment in a step S42.
According to certain aspects of the present invention, the information is included in an information element in a master information block or a system information block, or the information is included in radio resource control signaling during radio resource control establishment.
According to certain aspects of the present invention, the information is included in a radio resource control connection setup message.
According to certain aspects of the present invention, the message additionally includes rules for the user equipment to take the interworking capability of the base station into account in a cell selection process. The rules instruct the user equipment to select a cell served by a base station that has interworking capability and the reception level of which is lower than a predetermined threshold.
Fig. 5 shows a principle flowchart of another example for a method according to certain embodiments of the present invention. That is, as shown in Fig. 5, this method for use in a base station comprises composing, in a step S51, a message including information about at least one access point of a wireless local-area communication system and, and causing transmission/broadcast of the message to user equipment in a step S52.
According to certain aspects of the present invention, the information is included in an information element in a system information block, and the information includes at least one of version information, load status, location, working channel, and medium access control address of the access point.
According to certain aspects of the present invention, the access point is an access point controlled by the base station, an access point controlled by a neighbor base station to the base station, and/or an operator shared access point. Fig. 6 shows a principle flowchart of another example for a method according to certain embodiments of the present invention. That is, as shown in Fig. 6, this method for use in a base station comprises composing, in a step S61, a message including information indicating an interworking capability of user equipment between a wireless wide-area communication system and a wireless local-area communication system, the user equipment being connected to the base station, and causing transmission of the message to another base station in a step S62.
According to certain aspects of the present invention, the message additionally includes information indicating an interworking capability of the base station between a wireless wide-area communication system and a wireless local-area communication system. According to certain aspects of the present invention, the message is included in X2 setup request message or a handover request message and transmitted over X2 interface or S1 interface. Fig. 7 shows a principle configuration of an example for a base station according to certain embodiments of the present invention. The base station 70 comprises at least one processor 41 and at least one memory 72 including computer program code, which are connected by a bus 74 or the like. As indicated with a dashed line in Fig. 7, an interface 73 may optionally be connected to the bus 74 or the like, which may enable communication e.g. to/from a user equipment, a network entity, another base station, or the like. The at least one memory and the computer program code are arranged to, with the at least one processor, cause the base station at least to perform composing a message including information indicating an interworking capability of the base station between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to user equipment.
Further, the at least one memory and the computer program code are arranged to, with the at least one processor, cause the base station at least to perform composing a message including information about at least one access point of a wireless local-area communication system, and causing transmission/broadcast of the message to user equipment. Furthermore, the at least one memory and the computer program code are arranged to, with the at least one processor, cause the base station at least to perform composing a message including information indicating an interworking capability of user equipment between a wireless wide-area communication system and a wireless local-area communication system, the user equipment being connected to the base station, and causing transmission of the message to another base station.
For further functions of the base station, according to further exemplary embodiments of the present invention, reference is made to the above description of methods according to certain embodiments of the present invention, as described in connection with Figs.4 to 6.
In the foregoing exemplary description of the apparatuses, i.e. the user equipment or base station (or part of the user equipment or base station), only the units that are relevant for understanding the principles of the invention have been described using functional blocks. The apparatuses may comprise further units that are necessary for its respective operation as user equipment 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 invention, and the functions may be performed by one block or further split into sub-blocks. Further, the apparatuses, i.e. the user equipment or base station, may be connected via links 35/75. The links 35/75 may be a physical and/or logical coupling, which is implementation-independent (e.g. wired or wireless) .
According to exemplarily embodiments of the present invention, 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.
In general, it is to be noted that respective functional blocks or elements according to above-described aspects can 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 can be realized in individual functional blocks or by individual devices, or one or more of the method steps can be realized in a single functional block or by a single device. Generally, any procedural step or functionality is suitable to be implemented as software or by hardware without changing the idea of the present invention. Such software may be software code independent and can 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 can 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. 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 can 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. The present invention 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.
Even though the present invention and/or exemplary embodiments are described above with reference to the examples according to the accompanying drawings, it is to be understood that they are not restricted thereto. Rather, it is apparent to those skilled in the art that the present invention can be modified in many ways without departing from the scope of the inventive idea as disclosed herein.
Abbreviations:
AP Access Point
DL Downlink
eNB Enhanced Node B
EPC Evolved Packet Core
HO Handover
LTE Long Term Evolution
LTE-A Long Term Evolution Advanced
MAC Media Access Control
Ml B Master Information Block
PDCH Physical Discovery Channel
RRC Radio Resource Control
SIB System Information Block
UE User Equipment
UL Uplink
UTRA Universal Terrestrial Radio Access
WLAN Wireless Local Area Network

Claims

WHAT IS CLAIMED IS:
1. A method, comprising
composing, by a base station, a message including information indicating an interworking capability of the base station between a wireless wide-area communication system and a wireless local-area communication system, and causing transmission of the message to user equipment.
2. A method, comprising
composing, by a user equipment, a message including information indicating an interworking capability of the user equipment between a wireless wide-area communication system and a wireless local-area communication system, and
causing transmission of the message to a base station.
3. The method according to claim 1 or 2,
wherein the information is included in an information element in a master information block or a system information block.
4. The method according to claim 1 or 2, wherein
the information is included in radio resource control signaling during radio resource control establishment.
5. The method according to claim 4, wherein
the information is included in a radio resource control connection setup message.
6. The method according to any one of claims 1 and 3 to 5, wherein
the message additionally includes rules for the user equipment to take the interworking capability of the base station into account in a cell selection process.
7. The method according to claim 6, wherein the rules instruct the user equipment to select a cell served by a base station that has interworking capability and the reception level of which is lower than a predetermined threshold.
8. The method according to claim 2, wherein
the information is included in an UE-EUTRA-Capability message transmitted from the user equipment to the base station.
9. A method for use in a base station, comprising:
composing a message including information about at least one access point of a wireless local-area communication system and
causing transmission/broadcast of the message to user equipment.
10. The method according to claim 9, wherein
the information is included in an information element in a system information block.
11. The method according to claim 9 or 10, wherein
the information includes at least one of version information, load status, location, working channel, and medium access control address of the access point.
12. The method according to any one claims 9 to 11 , wherein
the access point is an access point controlled by the base station, an access point controlled by a neighbor base station to the base station, and/or an operator shared access point.
13. A method, comprising
composing, by a base station, a message including information indicating an interworking capability of user equipment between a wireless wide-area communication system and a wireless local-area communication system, the user equipment being connected to the base station, and
causing transmission of the message to another base station.
14. The method according to claim 13, wherein
the message additionally includes information indicating an interworking capability of the base station between a wireless wide-area communication system and a wireless local-area communication system.
15. The method according to claim 13 or 14, wherein
the message is included in X2 setup request message or a handover request message and transmitted over X2 interface or S1 interface.
16. A 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 base station at least to perform:
composing a message including information indicating an interworking capability of the base station between a wireless wide-area communication system and a wireless local-area communication system, and
causing transmission of the message to user equipment.
17. The base station according to claim 16,
wherein the information is included in an information element in a master information block or a system information block.
18. The base station according to claim 16, wherein
the information is included in radio resource control signaling during radio resource control establishment.
19. The base station according to claim 18, wherein
the information is included in a radio resource control connection setup message.
20. The base station according to any one of claims 16 to 19, wherein
the message additionally includes rules for the user equipment to take the interworking capability of the base station into account in a cell selection process.
21. The base station according to claim 20, wherein
the rules instruct the user equipment to select a cell served by a base station that has interworking capability and the reception level of which is lower than a predetermined threshold.
22. A user equipment, 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 user equipment at least to perform:
composing a message including information indicating an interworking capability of the user equipment between a wireless wide-area communication system and a wireless local-area communication system, and
causing transmission of the message to a base station.
23. The user equipment according to claim 22,
wherein the information is included in an information element in a master information block or a system information block.
24. The user equipment according to claim 22, wherein
the information is included in radio resource control signaling during radio resource control establishment.
25. The user equipment according to claim 24, wherein
the information is included in a radio resource control connection setup message.
26. The user equipment according to claim 22, wherein
the information is included in an UE-EUTRA-Capability message transmitted from the user equipment to the base station.
27. A 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:
composing a message including information about at least one access point of a wireless local-area communication system, and
causing transmission/broadcast of the message to user equipment.
28. The base station according to claim 27, wherein
the information is included in an information element in a system information block.
29. The base station according to claim 27 or 28, wherein
the information includes at least one of version information, load status, location, working channel, and medium access control address of the access point.
30. The base station according to any one of claims 27 or 29, wherein
the access point is an access point controlled by the base station, an access point controlled by a neighbor base station to the base station, and/or an operator shared access point.
31. A base station, comprising
composing a message including information indicating an interworking capability of user equipment between a wireless wide-area communication system and a wireless local-area communication system, the user equipment being connected to the base station, and
causing transmission of the message to another base station.
32. The base station according to claim 31, wherein
the message additionally includes information indicating an interworking capability of the base station between a wireless wide-area communication system and a wireless local-area communication system.
33. The base station according to claim 31 or 32, wherein the message is included in a X2 setup request message or a handover request message and transmitted over X2 interface or S1 interface.
34. An apparatus, comprising
means for composing a message including information indicating an interworking capability of the apparatus between a wireless wide-area communication system and a wireless local-area communication system, and means for causing transmission of the message to user equipment.
35. An apparatus, comprising
means for composing a message including information indicating an interworking capability of the apparatus between a wireless wide-area communication system and a wireless local-area communication system, and means for causing transmission of the message to a base station.
36. An apparatus, comprising:
means for composing a message including information about at least one access point of a wireless local-area communication system, and
means for causing transmission of the message to user equipment.
37. An apparatus, comprising
means for composing a message including information indicating an interworking capability of user equipment between a wireless wide-area communication system and a wireless local-area communication system, the user equipment being connected to the base station, and
means for causing transmission of the message to another base station.
38. A computer program product comprising computer-executable computer program code which, when the program is run on a computer, is arranged to cause the computer to carry out the method according to any one of claims 1 to 15.
39. The computer program product according to claim 38, embodied as a computer-readable storage medium.
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