WO2008111001A2 - System for establishing and controlling emergency priority in a communication system - Google Patents

System for establishing and controlling emergency priority in a communication system Download PDF

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Publication number
WO2008111001A2
WO2008111001A2 PCT/IB2008/050908 IB2008050908W WO2008111001A2 WO 2008111001 A2 WO2008111001 A2 WO 2008111001A2 IB 2008050908 W IB2008050908 W IB 2008050908W WO 2008111001 A2 WO2008111001 A2 WO 2008111001A2
Authority
WO
WIPO (PCT)
Prior art keywords
connection
user equipment
certain priority
recited
network element
Prior art date
Application number
PCT/IB2008/050908
Other languages
French (fr)
Other versions
WO2008111001A3 (en
Inventor
Marko Askelin
Asko Haapapuro
Jani R. Manninen
Veli-Pekka Junttila
Original Assignee
Nokia Corporation
Nokia Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Corporation, Nokia Inc. filed Critical Nokia Corporation
Publication of WO2008111001A2 publication Critical patent/WO2008111001A2/en
Publication of WO2008111001A3 publication Critical patent/WO2008111001A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0219—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave where the power saving management affects multiple terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/50—Connection management for emergency connections
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention is directed, in general, to communication systems and, in an embodiment, to a system, apparatus, and method for establishing a certain priority for communication with a user equipment in a communication system.
  • the telecommunications industry is in the process of developing a new generation of flexible and affordable communications that includes high-speed access while also supporting broadband services.
  • Many features of the third generation (3G) mobile telecommunications system have already been established, but many other features have yet to be perfected.
  • UMTS Universal Mobile Telecommunications System
  • FDD frequency division duplex
  • TDD time division duplex
  • SDD Space division duplex
  • the communication system includes an UMTS architecture having user equipment (UE) 102, a UMTS Terrestrial Radio Access Network (UTRAN) 104, and the Core Network (CN) 126.
  • UE user equipment
  • UTRAN UMTS Terrestrial Radio Access Network
  • CN Core Network
  • High-Speed Downlink Packet Access (HSDPA) and High-Speed Uplink Packet Access (HSUPA) are further 3G mobile telephony protocols in the High-Speed Packet Access (HSPA) family.
  • the aforementioned protocols provide a smooth evolutionary path for UMTS-based networks allowing for higher data transfer speeds.
  • Evolved UTRAN is a more recent project than HSPA, and is meant to take 3G even further into the future.
  • the E-UTRAN is designed to improve the UMTS communications to cope with various anticipated requirements.
  • the E-UTRAN is frequently indicated by the term Long Term Evolution (LTE), and is also associated with terms like System Architecture Evolution (SAE).
  • SAE System Architecture Evolution
  • IP Internet Protocol
  • IP Internet Protocol
  • PS Packet Switched
  • VoIP Voice Over Internet Protocol
  • the UTRAN network illustrated in FIGURE 1 includes a set of Radio Network Subsystems (RNS) 128, each of which has geographic coverage of a number of cells (C) 110.
  • the interface between the subsystems is called an Iur interface.
  • Each Radio Network Subsystem 128 includes a Radio Network Controller (RNC) 112 and at least one Node B 114, each Node B having geographic coverage of at least one cell 110.
  • RNC Radio Network Controller
  • the interface between an RNC 112 and a Node B 114 is called an Iub interface, and the Iub interface is typically hardwired rather than being an air interface.
  • RNC 112 A Node B 114 is responsible for radio transmission and reception to and from the UE 102.
  • the Node B antennas can typically be seen atop towers or, preferably, at less visible locations.
  • the RNC 112 has overall control of the logical resources of each Node B 114 within the RNS 128, and the RNC 112 is also responsible for handover decisions that entail switching a call from one cell to another or between radio channels in the same cell.
  • a UE can support multiple applications of different qualities of service running simultaneously.
  • MAC Media Access Control
  • PHY Physical Layer
  • the transport channel can define how traffic from logical channels is processed and sent to the Physical Layer (PHY).
  • PHY Physical Layer
  • the basic data unit exchanged between the MAC and the physical layer is called the Transport Block (TB). It is composed of a Radio Link Control (RLC), Protocol Data Unit (PDU) and a MAC header.
  • RLC Radio Link Control
  • PDU Protocol Data Unit
  • TTI Transmission Time Interval
  • several transport blocks and some other parameters are delivered to the physical layer.
  • the E-UTRAN consists of E-UTRAN Node B (eNBs), providing the E-UTRAN user plane (RLC/MAC/PHY) and control plane (Radio Resource Control (RRC)) protocol terminations towards the UE.
  • eNBs interface to an Access Gateway (aGW) via an Sl interface, and are interconnected via an X2 interface.
  • aGW Access Gateway
  • E-UTRAN includes eNBs, providing the E-UTRAN user plane (RLC/MAC/PHY) and control plane (RRC) protocol terminations towards the UE.
  • the eNBs are connected by the Sl interface to an Evolved Packet Core (EPC), more specifically to the Mobility Management Entity (MME).
  • EPC Evolved Packet Core
  • MME Mobility Management Entity
  • the Sl interface supports a many-to-many relation between MMEs and eNBs.
  • the MME in the example of FIGURE 2 is one option for the access gateway.
  • LTE ACTIVE inter-eNB mobility is supported by MME relocation via the S 1 interface.
  • PLMN Public Land Mobile Network
  • the eNB may host functions such as radio resource management (e.g., radio bearer control, radio admission control, connection mobility control, dynamic allocation of resources to UEs in both uplink and downlink), selection of a Mobility Management Entity (MME) at UE attachment, scheduling and transmission of paging messages (originated from the MME), scheduling and transmission of broadcast information (originated from the MME or Operations and Maintenance (O&M)), and measurement and measurement reporting configuration for mobility and scheduling.
  • radio resource management e.g., radio bearer control, radio admission control, connection mobility control, dynamic allocation of resources to UEs in both uplink and downlink
  • MME Mobility Management Entity
  • MME Mobility Management Entity
  • OFDM Operations and Maintenance
  • the MME may host functions such as distribution of paging messages to the eNBs, security control, IP header compression and encryption of user data streams, termination of U-plane packets for paging reasons, switching of U-plane for support of UE mobility, idle state mobility control, system architecture evolution bearer control, and ciphering and integrity protection of Non-Access Stratum (NAS) signaling.
  • NAS Non-Access Stratum
  • Communications systems can be configured to provide priority/emergency access to cellular service in times of crisis. Such times of crisis typically include natural and other disasters as well as "911" service access by individual users in the United States.
  • An E- UTRAN-registered UE establishes an emergency session in the Packet Switched (PS) domain.
  • PS Packet Switched
  • GERAN Second Generation
  • GSM Global System for Mobile Communications
  • EDGE Enhanced Data Rates for GSM Evolution
  • CS Circuit Switched
  • the UE When the UE initiates emergency access (to voice or data communications), for example via IP Multimedia Subsystem (IMS) Session Initiation Protocol (SIP) signaling, the UE informs the radio network and the core network about the importance of the connection to be established.
  • IMS IP Multimedia Subsystem
  • SIP Session Initiation Protocol
  • the present invention is directed to limitations that concern emergency access establishment and release procedures on radio network level.
  • a first identified problem involves the establishment access process that informs the radio network node eNB that the connection to be established has high priority (i.e., it has a certain priority) and that connection establishment should be allowed to continue.
  • the problem is that the radio network should allow the connection establishment to proceed even at the cost of dropping other lower priority connections.
  • Another problem to which embodiments of the present invention are directed involve the SAE radio bearer and cell association maintenance. If the emergency access was started from an ACTIVE mode when the connection was initially for some lower priority communications, the radio network node eNB should be informed that this connection is now of high priority and should not be released for the benefit of some other UE trying to establish lower priority communications while the emergency session is active.
  • a system and method to establish, maintain, and release a priority connection between a UE and a communication network is not presently available.
  • a priority access process and method in a communication system would provide improved emergency communication services and communication access and release for certain user equipment during times of crisis.
  • an apparatus e.g. , user equipment
  • a connection request module configured to initiate a random access channel indication message followed by a cell association request message to a network element to establish a certain priority for a connection for an idle state.
  • the apparatus also includes a priority request module configured to initiate a session initiation protocol message to the network element to establish a certain priority for a connection for an active state.
  • the present invention also provides a computer program product and method for establishing a connection for an emergency session on behalf of a user equipment in a communication system.
  • an apparatus e.g. , a network element
  • an idle state receiver module configured to receive a random access channel indication message followed by a cell association request message from a user equipment in an idle state to establish a certain priority for a connection with the user equipment.
  • the apparatus also includes an active state receiver module configured to receive a session initiation protocol message from the user equipment in an active state to establish a certain priority for a connection with the user equipment.
  • the present invention also provides a computer program product and method for establishing a connection for an emergency session by a network element on behalf of a user equipment in a communication system.
  • a communication system in another aspect, includes a user equipment and a network element.
  • the user equipment includes a prioritization module configured to detect a preference for a connection having a certain priority for the user equipment.
  • the user equipment also includes a connection request module configured to initiate a random access channel indication message followed by a cell association request message to a network element to establish a certain priority for a connection for an idle state.
  • the user equipment still further includes a priority request module configured to initiate a session initiation protocol message to the network element to establish a certain priority for a connection for an active state.
  • the network element includes an idle state receiver module configured to receive the random access channel indication message followed by the cell association request message from the user equipment in the idle state to establish a certain priority for a connection with the user equipment.
  • the network element also includes an active state receiver module configured to receive the session initiation protocol message from the user equipment in the active state to establish a certain priority for a connection with the user equipment.
  • FIGUREs 1 and 2 illustrate system level diagrams of embodiments of communication systems that provide an environment for an application of the principles of the present invention
  • FIGURES 3-5 illustrate flow diagrams of embodiments of operating a communication system according to the principles of the present invention
  • FIGURE 6 illustrates a system level diagram of an embodiment of a communication system that provides an environment for an application of the principles of the present invention
  • FIGURE 7 illustrates a flow diagram of an embodiment of operating a communication system according to the principles of the present invention
  • FIGUREs 8 A and 8B illustrate flow charts showing embodiments of managing a bearer priority in accordance with the principles of the present invention.
  • FIGUREs 9 and 10 illustrate system level diagrams of communication systems that provide an environment for the application of the principles of the present invention.
  • inventions will be described with respect to exemplary embodiments in a specific context of establishing and releasing a certain priority for user equipment that is in an idle state or that is initially in an active state without the certain priority.
  • embodiments of the invention may be applied to any form of communication system and network such as a cellular wireless communication system and network.
  • the present invention is applicable in the context of LTE, its principles are not limited to LTE, and instead may also be applicable to various other current and future communication systems.
  • the present invention provides an emergency indication to be used in the idle-to-active state transition, when a connection is established from an LTE IDLE state.
  • the eNB takes the necessary measures to enable the connection establishment to proceed.
  • Radio Resource (RR) level establishment request In the setting of radio access priority for GSM and UTRAN, it is known to make a request for higher priority, such as an emergency priority, via a mapping onto a Radio Resource (RR) level establishment request.
  • the network can then take the request into account, and either grant the priority or not, based on local policy, subscription, or traffic load.
  • RR Radio Resource
  • the present invention also provides a solution wherein both the radio network and the core network elements mark an SAE bearer (e.g., SAE radio bearer and an SAE access bearer) with the cell association of the active UE as having high priority.
  • SAE bearer e.g., SAE radio bearer and an SAE access bearer
  • the radio network becomes aware of the connection's "not-releasable" status.
  • the UE initiates a session stop using SIP signaling.
  • the end of the emergency communication session may also be initiated by the network.
  • the UE has other active SAE bearers, the cell association is maintained as long as needed or until the radio network needs to release the association as per normal policies.
  • the general term "base station” will be understood to include an eNB, a Node B, or any other network element that serves a purpose analogous to a base station of the UTRAN.
  • a Random Access Channel (RACH) procedure is implemented to convey an emergency indication that is used when a UE initiates a cell association procedure from an LTE IDLE state in order to establish an emergency session.
  • RACH Random Access Channel
  • the UE initiates the RACH procedure for an emergency session it needs to indicate the reason for the access (i.e., for establishment of the emergency session). From that indication of the reason, the eNB can see the importance/priority of the RACH procedure and, therefore, the eNB can allocate an uplink radio resource for the UE (which the UE then uses for sending a Cell Association Request).
  • the eNB may discard the random access request, in which case no Uplink (UL) resource would be allocated to the UE (i.e., emergency session establishment would fail). Therefore, the random access preamble that is inside the first UE RACH message has value(s) reserved for emergency access.
  • the eNB uses the emergency indication to maintain the connection until the core network signals the release of the emergency dedicated bearer.
  • FIGURE 3 illustrates a flow diagram showing the use of a RACH procedure to indicate the connection priority for a UE cell association procedure initiated from an LTE IDLE state in accordance with the principles of the present invention.
  • FIGURE and the other FIGUREs describe an option for MME and User Plane Entity (UPE) separation, even though either the MME or the UPE could manage bearer signaling.
  • MME User Plane Entity
  • UPE User Plane Entity
  • the choice of the MME or the UPE for this purpose does not affect the operation of the present invention.
  • the UPE be removed from the network and that its functions maybe allocated to the eNB, MME and an aGW.
  • C RNTI Cell Radio Network Temporary Identity
  • UE user equipment
  • eNB evolved Node B
  • MME Mobility Management Entity
  • UEE User Plane Entity
  • AF Access Function
  • PCRF Policy Control and Rules Function
  • the procedure begins with a UE in an LTE IDLE state transmitting an eNB an emergency indication on a RACH, followed by a CELL ASSOCIATION REQUEST.
  • the eNB replies with a CELL ASSOCIATION ESTABLISH utilizing a C RNTI.
  • the eNB In contrast to initiating an emergency session from an LTE IDLE state, if an emergency session is initiated from an LTE ACTIVE state, the eNB also uses a core network indication, such as a dedicated bearer establishment request for setting SAE bearer status high enough that it cannot be released for the benefit of another high priority session from another UE.
  • a core network indication such as a dedicated bearer establishment request for setting SAE bearer status high enough that it cannot be released for the benefit of another high priority session from another UE.
  • the RACH procedure can be used also in an active state, in case there is no UL radio resource allocated for the UE (i.e., no active UL data transfer is ongoing while the UE is in an active state).
  • FIGURE 4 illustrated is a flow diagram indicating UE emergency session initiation from an LTE ACTIVE state, wherein the UE has an active dedicated SAE bearer for some lower layer communication.
  • the UE initiates session establishment using Session Initiation Protocol (SIP) through the eNB and UPE to Access Function (AF), which requests a bearer quality of service (QoS) request to the Policy Control and Rules Function (PCRF) that communicates back to the User Plane Entity (UPE) to establish a dedicated bearer for emergency communication purposes.
  • SIP Session Initiation Protocol
  • AF Access Function
  • QoS bearer quality of service
  • PCRF Policy Control and Rules Function
  • UPE User Plane Entity
  • the UPE establishes connection to eNB, which from this point on is aware of the "not-releasable" status of the cell association with the UE.
  • the FIGURE uses "request resources” and “radio resource assignment” messages as an example, but the emergency status indication can be carried within
  • FIGURE 5 illustrated is a flow diagram showing downgrading of the bearer when the emergency session is exited in accordance with SIP signaling (i.e., when the emergency connection is released).
  • the UE transmits an emergency session leave request to the AF through eNB and the UPE.
  • the AF and UPE change the radio resource priority and request releasing of the SAE bearer.
  • FIGURE 6 illustrated is a system level diagram of an embodiment of a communication system that provides an environment for an application of the principles of the present invention.
  • the communication system provides a non-roaming architecture for 3GPP access from 3GPP TS 23.401, "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access (Release 8)," V8.0.0, December 2007, which is incorporated herein by reference.
  • GPRS General Packet Radio Service
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • Release 8 Evolved Universal Terrestrial Radio Access Network
  • GPRS General Packet Radio Service
  • GPRS General Packet Radio Service
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • PDN GW Packet Data Network Gateway
  • FIGURE 7 illustrated is a flow diagram of an embodiment of operating a communication system according to the principles of the present invention.
  • the flow diagram supports the establishment of a dedicated bearer channel in accordance with the communication system introduced above with respect to FIGURE 6.
  • an emergency session can be initiated employing SIP signaling, wherein analysis is performed in the PDN GW and a trigger is sent to PCRF, which then initiates dedicated bearer establishment as illustrated by a Create Dedicated Bearer Request message.
  • the PDN GW, Serving GW, MME, eNodeB and UE then perform the illustrated signaling to create the dedicated bearer for an emergency session.
  • the communication system of FIGURE 6 and procedure of FIGURE 7 are exemplary communication systems and procedures in accordance with the principles of the present invention.
  • the method when the user equipment is in an idle state, the method includes receiving at a network element (e.g. , base station) a random access channel indication message and a cell association request message from the user equipment, then providing to the user equipment a cell association establishment message for a connection having a certain priority.
  • the cell association establishment message may be provided by the base station in accordance with a cell radio network temporary identity.
  • the method includes receiving a session initiation protocol message from the user equipment at a step 820, then marking or dedicating a bearer for the connection having the certain priority.
  • the active state of the user equipment initially included a connection having a priority lower than the certain priority.
  • the connection having the certain priority may be an emergency connection that is allowed to proceed even at a cost of dropping a lower priority connection of this or another user equipment.
  • the method includes processing a session initiation protocol message from the user equipment to stop, terminate or release the connection having the certain priority.
  • the method includes detecting a need or preference for a connection having a certain priority at the user equipment.
  • the method includes seeking the connection having the certain priority by providing a random access channel indication message and a cell association request message to a network element (e.g., base station) and using the connection having the certain priority after receipt of a cell association establishment message from the base station.
  • the cell association establishment message may be provided by the base station in accordance with a cell radio network temporary identity.
  • the method includes seeking the connection having the certain priority by providing a session initiation protocol message to the network element (e.g., base station) and using the connection having the certain priority after both the base station and a core network have marked or dedicated a bearer for the connection having the certain priority.
  • the active state of the user equipment initially included a connection having a priority lower than the certain priority.
  • the connection having the certain priority may be an emergency connection that is allowed to proceed even at a cost of dropping a lower priority connection of this or another user equipment.
  • the method includes sending a session initiation protocol message from the user equipment to stop, terminate or release the connection having the certain priority.
  • the bearer may be marked or dedicated by the base station and the core network as having the certain priority and as being not releasable, and the cell association is also marked or dedicated by the base station and the core network as having the certain priority and as being not releasable, the bearer being a radio bearer or access bearer.
  • a computer program product including a computer readable medium having executable code stored therein and when executed by a processor is configured to perform the apparatus, method and system as described herein.
  • a network element includes means for receiving a random access channel indication message and a cell association request message from a user equipment if the user equipment is in an idle state, and means for providing to the user equipment a cell association establishment message for a connection having a certain priority in response to the indication and the request.
  • the network element also includes means for receiving a session initiation protocol message from the user equipment if the user equipment is in an active state instead of the initial idle state, and means for marking or dedicating a bearer for the connection having the certain priority in response to the session initiation protocol message.
  • the network element also includes means for processing a session initiation protocol message from the user equipment to stop, terminate or release the connection having the certain priority.
  • the idle state may lack a connection having any priority and the active state includes a connection having a priority lower than the certain priority until the connection having the priority lower than the certain priority is assigned the certain priority.
  • a user equipment includes means for detecting a need or preference for a connection having a certain priority. If in an idle state, the user equipment includes means for seeking the connection having the certain priority by providing a random access channel indication message and a cell association request message to a network element (e.g. , base station) and means for using the connection having the certain priority after receipt of a cell association establishment message from the base station. If the user equipment is in the idle state, the cell association establishment message may be received from the base station in accordance with a cell radio network temporary identity.
  • a network element e.g. , base station
  • the user equipment includes means for seeking the connection having the certain priority by providing a session initiation protocol message to a network element (e.g., base station), wherein the means for using the connection is also for using the connection having the certain priority after both the base station and a core network have marked or dedicated a bearer for the connection having the certain priority.
  • a network element e.g., base station
  • the idle state lacks a connection having any priority
  • the active state includes a connection having a priority lower than the certain priority, until the connection having the priority lower than the certain priority is assigned the certain priority.
  • the user equipment also includes means for sending a session initiation protocol message from the user equipment in order to stop, terminate or release the connection having the certain priority. If the user equipment has another active bearer, aside from the connection having the certain priority, then the cell association is maintained for the other active bearer.
  • the connection having the certain priority is an emergency connection that is allowed to proceed even at a cost of dropping a lower priority connection of this or another user equipment.
  • FIGURE 9 illustrates communication between a network element 955 and a user equipment 905 to manage bearer priority.
  • the connection between the user equipment 905 and network element 955 may be for an emergency session on behalf of the user equipment 905.
  • the network element 955 such as a base station includes an idle state receiver module 957 configured to receive a random access channel indication message and a cell association request message from a user equipment 905 if the user equipment 905 is in an idle state.
  • the network element 955 also includes a transmitter module 959 configured to send to the user equipment 905 a cell association establishment message for a connection having a certain priority in response to the indication and the request.
  • the network element 955 also includes an active state receiver module 963 configured to receive a session initiation protocol message from the user equipment 905 if the user equipment 905 is in an active state instead of the initial idle state, and a marking module 961 configured to mark or dedicate a bearer for the connection having the certain priority in response to the session initiation protocol message.
  • the initial idle state lacks a connection having any priority and the initial active state includes a connection having a priority lower than the certain priority, until the connection having the priority lower than the certain priority is assigned the certain priority.
  • the network element 955 further includes a processing module 970 configured to, among other things, process a session initiation protocol message from the user equipment 905 in order to stop, terminate or release the connection having the certain priority.
  • the user equipment 905 includes a prioritization module 907 configured to detect a need or preference for a connection having a certain priority.
  • the user equipment 905 includes a connection request module 909 configured to seek the connection having the certain priority, if the user equipment 905 is in an idle state, by providing a random access channel indication message and a cell association request message to the network element 955.
  • the user equipment also includes a communication module 911 configured to use the connection having the certain priority after receipt of a cell association establishment message from the network element 955, if the user equipment 905 is in the idle state.
  • the user equipment further includes a priority request module 913 configured to seek the connection having the certain priority, if the user equipment 905 is in the active state instead of the initial idle state, by providing a session initiation protocol message to the network element 955, wherein the communication module 911 is further configured to use the connection having the certain priority after both the network element 955 and a core network have marked or dedicated a bearer for the connection having the certain priority.
  • the initial idle state lacks a connection having any priority and the initial active state includes a connection having a priority lower than the certain priority, until the connection having the priority lower than the certain priority is assigned the certain priority.
  • the user equipment 905 also includes a stop module 920 configured to send a session initiation protocol message from the user equipment 905 to stop, terminate or release the connection having the certain priority.
  • the computer system includes a processor including a single processing unit, multiple processing units capable of parallel operation, or the processor can be distributed across one or more processing units in one or more locations (e.g., on a client and server).
  • a memory may include any known type of data storage and/or transmission media, including magnetic media, optical media, Random Access Memory (RAM), Read-Only Memory (ROM), a data cache, a data object, etc.
  • the memory may reside at a single physical location including one or more types of data storage, or be distributed across a plurality of physical systems in various forms.
  • the communication system includes user equipment UE adapted to communicate with a network element such as a base station (designated "eNB”) in a cell that is coupled to a Network Control Element (NCE) such as an access gateway.
  • a network element such as a base station (designated "eNB"
  • NCE Network Control Element
  • the user equipment includes a data processor (designated “DP"), a memory (designated “MEM”) that stores programs (designated “PRGM”), a timer (designated “TIMER”) and a radio frequency transceiver (designated “TRC”) for bidirectional wireless communications with the base station.
  • the base station includes a data processor (also designated “DP"), a memory (also designated “MEM”) that stores programs (also designated “PRGM”), and a radio frequency transceiver (also designated “TRC”) for bidirectional wireless communications with the user equipment.
  • the network control element includes a data processor (also designated “DP”), and a memory (also designated “MEM”) that stores programs (also designated "PRGM”).
  • the base station provides the E-UTRAN user plane (e.g., radio link control/media access control/physical) and control plane (e.g., RRC) protocol terminations toward the user equipment.
  • the base station communicates with the network control element via an S 1 interface or communication link, and may be interconnected via an X2 interface or communication link to another base station (not shown).
  • the memory as introduced hereinabove may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the data processors may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, Digital Signal Processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples.
  • the programs includes program instructions that, when executed by the associated data processor, enable the electronic device to perform tasks as described herein. Exemplary embodiments of the system, subsystems and modules as described herein may be implemented at least in part by computer software executable by the data processors of the user equipment and base stations, or by hardware, or combinations thereof.
  • a method, user equipment, network device, and software product enable a user equipment to establish a high priority connection with a UTRAN, E-UTRAN, or other communication networks, from either an active or an idle state. This connection will be established even if it causes lower priority connections to be dropped.
  • a session initiation protocol message is used to terminate the high priority connection, while maintaining any other bearers that the user equipment may be using.
  • the exemplary embodiment provides both a method and corresponding apparatus consisting of various modules providing functionality for performing the steps of the method.
  • the modules may be implemented as hardware (including an integrated circuit), or may be implemented as software or firmware for execution by a computer processor.
  • firmware or software the exemplary embodiment can be provided as a computer program product including a computer readable storage structure embodying computer program code (i.e., software or firmware) thereon for execution by the computer processor.

Abstract

An apparatus, method and system for establishing and controlling an emergency priority for a user equipment in a communication system. In one embodiment, an apparatus 905 includes a connection request module 909 configured to initiate a random access channel indication message followed by a cell association request message to a network element 955 to establish a certain priority for a connection for an idle state. The apparatus 905 also includes a priority request module 913 configured to initiate a session initiation protocol message to the network element 955 to establish a certain priority for a connection for an active state.

Description

SYSTEM FOR ESTABLISHING AND CONTROLLING EMERGENCY PRIORITY IN A COMMUNICATION SYSTEM
This application claims the benefit of U.S. Provisional Application No. 60/918,021, entitled "Method, User Equipment, Network Element, Software Product and System for Establishment of a Wireless Connection Having a Certain Priority," filed on March 13, 2007, which is incorporated herein by reference.
TECHNICAL FIELD
The present invention is directed, in general, to communication systems and, in an embodiment, to a system, apparatus, and method for establishing a certain priority for communication with a user equipment in a communication system.
BACKGROUND
The telecommunications industry is in the process of developing a new generation of flexible and affordable communications that includes high-speed access while also supporting broadband services. Many features of the third generation (3G) mobile telecommunications system have already been established, but many other features have yet to be perfected.
One of the systems within the third generation of mobile communications is the Universal Mobile Telecommunications System (UMTS) which delivers voice, data, multimedia, and wideband information to user equipment. The UMTS is designed to accommodate increased system capacity and data capability. Efficient use of the electromagnetic spectrum is important in UMTS. It is known that spectrum efficiency can be attained using frequency division duplex (FDD) or using time division duplex (TDD) schemes. Space division duplex (SDD) is a third duplex transmission method used for wireless communications.
Turning now to FIGUREs 1 and 2, illustrated are system level diagrams of embodiments of communication systems that provide an environment for an application of the principles of the present invention. The communication system includes an UMTS architecture having user equipment (UE) 102, a UMTS Terrestrial Radio Access Network (UTRAN) 104, and the Core Network (CN) 126. The air interface between the UTRAN and the UE is called a Uu interface, and the interface between the UTRAN and the Core Network is called an Iu interface.
High-Speed Downlink Packet Access (HSDPA) and High-Speed Uplink Packet Access (HSUPA) are further 3G mobile telephony protocols in the High-Speed Packet Access (HSPA) family. The aforementioned protocols provide a smooth evolutionary path for UMTS-based networks allowing for higher data transfer speeds.
Evolved UTRAN (E-UTRAN) is a more recent project than HSPA, and is meant to take 3G even further into the future. The E-UTRAN is designed to improve the UMTS communications to cope with various anticipated requirements. The E-UTRAN is frequently indicated by the term Long Term Evolution (LTE), and is also associated with terms like System Architecture Evolution (SAE). One target of E-UTRAN is to enable Internet Protocol (IP) systems to efficiently transmit IP data. The system will use a Packet Switched (PS) domain for voice and data calls (i.e., the system will contain Voice Over Internet Protocol (VoIP)).
Information about LTE can be found in specification 3GPP TR 25.913, "Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN," V7.2.0, December 2005, and also in specification 3GPP TR 25.813, "Evolved UTRA and UTRAN- Radio Interface Protocol Aspects," VO.1.0, November 2005, both of which are incorporated herein by reference in their entirety. UTRAN and E-UTRAN will now be described in some further detail.
The UTRAN network illustrated in FIGURE 1 includes a set of Radio Network Subsystems (RNS) 128, each of which has geographic coverage of a number of cells (C) 110. The interface between the subsystems is called an Iur interface. Each Radio Network Subsystem 128 includes a Radio Network Controller (RNC) 112 and at least one Node B 114, each Node B having geographic coverage of at least one cell 110. As can be seen from FIGURE 1, the interface between an RNC 112 and a Node B 114 is called an Iub interface, and the Iub interface is typically hardwired rather than being an air interface. For any Node B 114, there is an RNC 112. A Node B 114 is responsible for radio transmission and reception to and from the UE 102. The Node B antennas can typically be seen atop towers or, preferably, at less visible locations. The RNC 112 has overall control of the logical resources of each Node B 114 within the RNS 128, and the RNC 112 is also responsible for handover decisions that entail switching a call from one cell to another or between radio channels in the same cell.
In UMTS radio networks, a UE can support multiple applications of different qualities of service running simultaneously. In the Media Access Control (MAC) layer, multiple logical channels can be multiplexed to a single transport channel. The transport channel can define how traffic from logical channels is processed and sent to the Physical Layer (PHY). The basic data unit exchanged between the MAC and the physical layer is called the Transport Block (TB). It is composed of a Radio Link Control (RLC), Protocol Data Unit (PDU) and a MAC header. During a period of time called the Transmission Time Interval (TTI), several transport blocks and some other parameters are delivered to the physical layer.
Generally speaking, a prefix of the letter "E" in upper or lower case signifies Long Term Evolution. The E-UTRAN consists of E-UTRAN Node B (eNBs), providing the E-UTRAN user plane (RLC/MAC/PHY) and control plane (Radio Resource Control (RRC)) protocol terminations towards the UE. The eNBs interface to an Access Gateway (aGW) via an Sl interface, and are interconnected via an X2 interface.
Regarding FIGURE 2, illustrated is a system level diagram of an embodiment of the E- UTRAN LTE architecture. This example of E-UTRAN includes eNBs, providing the E-UTRAN user plane (RLC/MAC/PHY) and control plane (RRC) protocol terminations towards the UE. The eNBs are connected by the Sl interface to an Evolved Packet Core (EPC), more specifically to the Mobility Management Entity (MME). The Sl interface supports a many-to-many relation between MMEs and eNBs. The MME in the example of FIGURE 2 is one option for the access gateway.
In this example there exists an X2 interface between the eNBs that need to communicate with each other. For exceptional cases (e.g., inter-Public Land Mobile Network (PLMN) handover), LTE ACTIVE inter-eNB mobility is supported by MME relocation via the S 1 interface.
The eNB may host functions such as radio resource management (e.g., radio bearer control, radio admission control, connection mobility control, dynamic allocation of resources to UEs in both uplink and downlink), selection of a Mobility Management Entity (MME) at UE attachment, scheduling and transmission of paging messages (originated from the MME), scheduling and transmission of broadcast information (originated from the MME or Operations and Maintenance (O&M)), and measurement and measurement reporting configuration for mobility and scheduling. The MME may host functions such as distribution of paging messages to the eNBs, security control, IP header compression and encryption of user data streams, termination of U-plane packets for paging reasons, switching of U-plane for support of UE mobility, idle state mobility control, system architecture evolution bearer control, and ciphering and integrity protection of Non-Access Stratum (NAS) signaling.
Communications systems can be configured to provide priority/emergency access to cellular service in times of crisis. Such times of crisis typically include natural and other disasters as well as "911" service access by individual users in the United States. An E- UTRAN-registered UE establishes an emergency session in the Packet Switched (PS) domain. In contrast, consider a Second Generation (2G) system like GERAN, which is an abbreviation for Global System for Mobile Communications (GSM) Enhanced Data Rates for GSM Evolution (EDGE) Radio Access Network. Using GERAN, it is assumed that emergency access is made using the Circuit Switched (CS) domain, instead of the PS domain.
When the UE initiates emergency access (to voice or data communications), for example via IP Multimedia Subsystem (IMS) Session Initiation Protocol (SIP) signaling, the UE informs the radio network and the core network about the importance of the connection to be established. As will become more apparent below, the present invention is directed to limitations that concern emergency access establishment and release procedures on radio network level.
A first identified problem involves the establishment access process that informs the radio network node eNB that the connection to be established has high priority (i.e., it has a certain priority) and that connection establishment should be allowed to continue. The problem is that the radio network should allow the connection establishment to proceed even at the cost of dropping other lower priority connections.
Another problem to which embodiments of the present invention are directed involve the SAE radio bearer and cell association maintenance. If the emergency access was started from an ACTIVE mode when the connection was initially for some lower priority communications, the radio network node eNB should be informed that this connection is now of high priority and should not be released for the benefit of some other UE trying to establish lower priority communications while the emergency session is active.
Considering the limitations of cellular networks as described above, a system and method to establish, maintain, and release a priority connection between a UE and a communication network is not presently available. In accordance therewith, a priority access process and method in a communication system would provide improved emergency communication services and communication access and release for certain user equipment during times of crisis.
SUMMARY OF THE INVENTION
These and other problems are generally solved or circumvented, and technical advantages are generally achieved, by embodiments of the present invention, which include an apparatus, method and system for establishing and controlling an emergency priority for a user equipment in a communication system. In one embodiment, an apparatus (e.g. , user equipment) includes a connection request module configured to initiate a random access channel indication message followed by a cell association request message to a network element to establish a certain priority for a connection for an idle state. The apparatus also includes a priority request module configured to initiate a session initiation protocol message to the network element to establish a certain priority for a connection for an active state. The present invention also provides a computer program product and method for establishing a connection for an emergency session on behalf of a user equipment in a communication system.
In another aspect, an apparatus (e.g. , a network element) includes an idle state receiver module configured to receive a random access channel indication message followed by a cell association request message from a user equipment in an idle state to establish a certain priority for a connection with the user equipment. The apparatus also includes an active state receiver module configured to receive a session initiation protocol message from the user equipment in an active state to establish a certain priority for a connection with the user equipment. The present invention also provides a computer program product and method for establishing a connection for an emergency session by a network element on behalf of a user equipment in a communication system.
In another aspect, a communication system includes a user equipment and a network element. The user equipment includes a prioritization module configured to detect a preference for a connection having a certain priority for the user equipment. The user equipment also includes a connection request module configured to initiate a random access channel indication message followed by a cell association request message to a network element to establish a certain priority for a connection for an idle state. The user equipment still further includes a priority request module configured to initiate a session initiation protocol message to the network element to establish a certain priority for a connection for an active state. The network element includes an idle state receiver module configured to receive the random access channel indication message followed by the cell association request message from the user equipment in the idle state to establish a certain priority for a connection with the user equipment. The network element also includes an active state receiver module configured to receive the session initiation protocol message from the user equipment in the active state to establish a certain priority for a connection with the user equipment.
The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the detailed description of the invention that follows may be better understood. Additional features and advantages of the invention will be described hereinafter which form the subject of the claims of the invention. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures or processes for carrying out the same purposes of the present invention. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the invention as set forth in the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
For a more complete understanding of the invention, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawing, in which:
FIGUREs 1 and 2 illustrate system level diagrams of embodiments of communication systems that provide an environment for an application of the principles of the present invention;
FIGURES 3-5 illustrate flow diagrams of embodiments of operating a communication system according to the principles of the present invention;
FIGURE 6 illustrates a system level diagram of an embodiment of a communication system that provides an environment for an application of the principles of the present invention;
FIGURE 7 illustrates a flow diagram of an embodiment of operating a communication system according to the principles of the present invention;
FIGUREs 8 A and 8B illustrate flow charts showing embodiments of managing a bearer priority in accordance with the principles of the present invention; and
FIGUREs 9 and 10 illustrate system level diagrams of communication systems that provide an environment for the application of the principles of the present invention.
DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
The making and using of exemplary embodiments are discussed in detail below. It should be appreciated, however, that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention.
The present invention will be described with respect to exemplary embodiments in a specific context of establishing and releasing a certain priority for user equipment that is in an idle state or that is initially in an active state without the certain priority. In general, embodiments of the invention may be applied to any form of communication system and network such as a cellular wireless communication system and network.
Although the present invention is applicable in the context of LTE, its principles are not limited to LTE, and instead may also be applicable to various other current and future communication systems. In the context of LTE, the present invention provides an emergency indication to be used in the idle-to-active state transition, when a connection is established from an LTE IDLE state. When receiving the indication, the eNB takes the necessary measures to enable the connection establishment to proceed.
In the setting of radio access priority for GSM and UTRAN, it is known to make a request for higher priority, such as an emergency priority, via a mapping onto a Radio Resource (RR) level establishment request. The network can then take the request into account, and either grant the priority or not, based on local policy, subscription, or traffic load. This is described, for example, in specification 3GPP TS 24.008, "Mobile Radio Interface Layer 3 Specification, Core Network Protocols, Stage 3," V7.6.0, December 2006, which is incorporated herein by reference in its entirety. However, that approach is very limited, and will not work in the context of LTE. Therefore, a new approach is needed.
The present invention also provides a solution wherein both the radio network and the core network elements mark an SAE bearer (e.g., SAE radio bearer and an SAE access bearer) with the cell association of the active UE as having high priority. In this way, the radio network becomes aware of the connection's "not-releasable" status. When the emergency communication session is to be ended, the UE initiates a session stop using SIP signaling. The end of the emergency communication session may also be initiated by the network. However, if the UE has other active SAE bearers, the cell association is maintained as long as needed or until the radio network needs to release the association as per normal policies. Throughout this application, the general term "base station" will be understood to include an eNB, a Node B, or any other network element that serves a purpose analogous to a base station of the UTRAN.
As provided herein, a Random Access Channel (RACH) procedure is implemented to convey an emergency indication that is used when a UE initiates a cell association procedure from an LTE IDLE state in order to establish an emergency session. When the UE initiates the RACH procedure for an emergency session, it needs to indicate the reason for the access (i.e., for establishment of the emergency session). From that indication of the reason, the eNB can see the importance/priority of the RACH procedure and, therefore, the eNB can allocate an uplink radio resource for the UE (which the UE then uses for sending a Cell Association Request). If at that point, the eNB cannot see the importance/priority of the RACH procedure, the eNB may discard the random access request, in which case no Uplink (UL) resource would be allocated to the UE (i.e., emergency session establishment would fail). Therefore, the random access preamble that is inside the first UE RACH message has value(s) reserved for emergency access. The eNB uses the emergency indication to maintain the connection until the core network signals the release of the emergency dedicated bearer.
Turning now to FIGUREs 3-5, illustrated are flow diagrams of embodiments of operating a communication system according to the principles of the present invention. FIGURE 3 illustrates a flow diagram showing the use of a RACH procedure to indicate the connection priority for a UE cell association procedure initiated from an LTE IDLE state in accordance with the principles of the present invention. Note that this FIGURE and the other FIGUREs describe an option for MME and User Plane Entity (UPE) separation, even though either the MME or the UPE could manage bearer signaling. The choice of the MME or the UPE for this purpose does not affect the operation of the present invention. Moreover, it is possible that the UPE be removed from the network and that its functions maybe allocated to the eNB, MME and an aGW.
As illustrated in FIGURE 3, establishment of a cell association utilizes a Cell Radio Network Temporary Identity (C RNTI). As a person skilled in the art will understand, the various points shown in FIGURE 3 for receiving and sending signals are for the user equipment (UE), the evolved Node B (eNB), the Mobility Management Entity (MME), the User Plane Entity (UPE), the Access Function (AF), and the Policy Control and Rules Function (PCRF). The procedure begins with a UE in an LTE IDLE state transmitting an eNB an emergency indication on a RACH, followed by a CELL ASSOCIATION REQUEST. The eNB replies with a CELL ASSOCIATION ESTABLISH utilizing a C RNTI.
In contrast to initiating an emergency session from an LTE IDLE state, if an emergency session is initiated from an LTE ACTIVE state, the eNB also uses a core network indication, such as a dedicated bearer establishment request for setting SAE bearer status high enough that it cannot be released for the benefit of another high priority session from another UE. Note that the RACH procedure can be used also in an active state, in case there is no UL radio resource allocated for the UE (i.e., no active UL data transfer is ongoing while the UE is in an active state).
With reference to FIGURE 4, illustrated is a flow diagram indicating UE emergency session initiation from an LTE ACTIVE state, wherein the UE has an active dedicated SAE bearer for some lower layer communication. The UE initiates session establishment using Session Initiation Protocol (SIP) through the eNB and UPE to Access Function (AF), which requests a bearer quality of service (QoS) request to the Policy Control and Rules Function (PCRF) that communicates back to the User Plane Entity (UPE) to establish a dedicated bearer for emergency communication purposes. The UPE establishes connection to eNB, which from this point on is aware of the "not-releasable" status of the cell association with the UE. The FIGURE uses "request resources" and "radio resource assignment" messages as an example, but the emergency status indication can be carried within any message that is used between the UPE and the eNB in the SAE bearer management.
With reference to FIGURE 5, illustrated is a flow diagram showing downgrading of the bearer when the emergency session is exited in accordance with SIP signaling (i.e., when the emergency connection is released). The UE transmits an emergency session leave request to the AF through eNB and the UPE. The AF and UPE change the radio resource priority and request releasing of the SAE bearer.
Turning now to FIGURE 6, illustrated is a system level diagram of an embodiment of a communication system that provides an environment for an application of the principles of the present invention. The communication system provides a non-roaming architecture for 3GPP access from 3GPP TS 23.401, "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access (Release 8)," V8.0.0, December 2007, which is incorporated herein by reference. It should be noted that a Serving Gateway (Serving GW) and Packet Data Network Gateway (PDN GW), which may be implemented together, perform analogous functions to the UPE described above. The subsystems of the communication system are generally known and described in 3GPP TS 23.401 introduced above and, as such, will not be described in detail below.
Turning now to FIGURE 7, illustrated is a flow diagram of an embodiment of operating a communication system according to the principles of the present invention. In particular, the flow diagram supports the establishment of a dedicated bearer channel in accordance with the communication system introduced above with respect to FIGURE 6. Analogous to the procedure described above, an emergency session can be initiated employing SIP signaling, wherein analysis is performed in the PDN GW and a trigger is sent to PCRF, which then initiates dedicated bearer establishment as illustrated by a Create Dedicated Bearer Request message. The PDN GW, Serving GW, MME, eNodeB and UE then perform the illustrated signaling to create the dedicated bearer for an emergency session. Again, the communication system of FIGURE 6 and procedure of FIGURE 7 are exemplary communication systems and procedures in accordance with the principles of the present invention.
Turning now to FIGURES 8A and 8B, illustrated are flow charts showing embodiments of managing a bearer priority in accordance with the principles of the present invention. As illustrated in step 810 of FIGURE 8 A, when the user equipment is in an idle state, the method includes receiving at a network element (e.g. , base station) a random access channel indication message and a cell association request message from the user equipment, then providing to the user equipment a cell association establishment message for a connection having a certain priority. The cell association establishment message may be provided by the base station in accordance with a cell radio network temporary identity.
When the user equipment is in an active state, the method includes receiving a session initiation protocol message from the user equipment at a step 820, then marking or dedicating a bearer for the connection having the certain priority. In the latter case, the active state of the user equipment initially included a connection having a priority lower than the certain priority. Additionally, the connection having the certain priority may be an emergency connection that is allowed to proceed even at a cost of dropping a lower priority connection of this or another user equipment. According to step 830, the method includes processing a session initiation protocol message from the user equipment to stop, terminate or release the connection having the certain priority.
As illustrated in step 840 of FIGURE 8B, the method includes detecting a need or preference for a connection having a certain priority at the user equipment. At a step 850, if the user equipment is in an idle state, the method includes seeking the connection having the certain priority by providing a random access channel indication message and a cell association request message to a network element (e.g., base station) and using the connection having the certain priority after receipt of a cell association establishment message from the base station. The cell association establishment message may be provided by the base station in accordance with a cell radio network temporary identity.
At a step 860, if the user equipment is in an active state, the method includes seeking the connection having the certain priority by providing a session initiation protocol message to the network element (e.g., base station) and using the connection having the certain priority after both the base station and a core network have marked or dedicated a bearer for the connection having the certain priority. In the latter case, the active state of the user equipment initially included a connection having a priority lower than the certain priority. Additionally, the connection having the certain priority may be an emergency connection that is allowed to proceed even at a cost of dropping a lower priority connection of this or another user equipment. According to a step 870, the method includes sending a session initiation protocol message from the user equipment to stop, terminate or release the connection having the certain priority.
In accordance with embodiments of the present invention, if the user equipment may have another active bearer, aside from the connection having the certain priority, then the cell association is maintained for the other active bearer. Additionally, if the user equipment is in an active state instead of the idle state, then the bearer may be marked or dedicated by the base station and the core network as having the certain priority and as being not releasable, and the cell association is also marked or dedicated by the base station and the core network as having the certain priority and as being not releasable, the bearer being a radio bearer or access bearer.
In one embodiment, a computer program product including a computer readable medium having executable code stored therein and when executed by a processor is configured to perform the apparatus, method and system as described herein.
In one embodiment, a network element includes means for receiving a random access channel indication message and a cell association request message from a user equipment if the user equipment is in an idle state, and means for providing to the user equipment a cell association establishment message for a connection having a certain priority in response to the indication and the request. The network element also includes means for receiving a session initiation protocol message from the user equipment if the user equipment is in an active state instead of the initial idle state, and means for marking or dedicating a bearer for the connection having the certain priority in response to the session initiation protocol message. The network element also includes means for processing a session initiation protocol message from the user equipment to stop, terminate or release the connection having the certain priority. In accordance therewith, the idle state may lack a connection having any priority and the active state includes a connection having a priority lower than the certain priority until the connection having the priority lower than the certain priority is assigned the certain priority.
In one embodiment, a user equipment includes means for detecting a need or preference for a connection having a certain priority. If in an idle state, the user equipment includes means for seeking the connection having the certain priority by providing a random access channel indication message and a cell association request message to a network element (e.g. , base station) and means for using the connection having the certain priority after receipt of a cell association establishment message from the base station. If the user equipment is in the idle state, the cell association establishment message may be received from the base station in accordance with a cell radio network temporary identity. If in an active state, the user equipment includes means for seeking the connection having the certain priority by providing a session initiation protocol message to a network element (e.g., base station), wherein the means for using the connection is also for using the connection having the certain priority after both the base station and a core network have marked or dedicated a bearer for the connection having the certain priority.
In accordance with the foregoing, the idle state lacks a connection having any priority, and the active state includes a connection having a priority lower than the certain priority, until the connection having the priority lower than the certain priority is assigned the certain priority. The user equipment also includes means for sending a session initiation protocol message from the user equipment in order to stop, terminate or release the connection having the certain priority. If the user equipment has another active bearer, aside from the connection having the certain priority, then the cell association is maintained for the other active bearer. Additionally, the connection having the certain priority is an emergency connection that is allowed to proceed even at a cost of dropping a lower priority connection of this or another user equipment.
Turning now to FIGUREs 9 and 10, illustrated are system level diagrams of communication systems that provide an environment for the application of the principles of the present invention. FIGURE 9 illustrates communication between a network element 955 and a user equipment 905 to manage bearer priority. The connection between the user equipment 905 and network element 955 may be for an emergency session on behalf of the user equipment 905. The network element 955 such as a base station includes an idle state receiver module 957 configured to receive a random access channel indication message and a cell association request message from a user equipment 905 if the user equipment 905 is in an idle state. The network element 955 also includes a transmitter module 959 configured to send to the user equipment 905 a cell association establishment message for a connection having a certain priority in response to the indication and the request. The network element 955 also includes an active state receiver module 963 configured to receive a session initiation protocol message from the user equipment 905 if the user equipment 905 is in an active state instead of the initial idle state, and a marking module 961 configured to mark or dedicate a bearer for the connection having the certain priority in response to the session initiation protocol message. It should be understood that the initial idle state lacks a connection having any priority and the initial active state includes a connection having a priority lower than the certain priority, until the connection having the priority lower than the certain priority is assigned the certain priority. The network element 955 further includes a processing module 970 configured to, among other things, process a session initiation protocol message from the user equipment 905 in order to stop, terminate or release the connection having the certain priority.
As shown in FIGURE 9, the user equipment 905 includes a prioritization module 907 configured to detect a need or preference for a connection having a certain priority. The user equipment 905 includes a connection request module 909 configured to seek the connection having the certain priority, if the user equipment 905 is in an idle state, by providing a random access channel indication message and a cell association request message to the network element 955. The user equipment also includes a communication module 911 configured to use the connection having the certain priority after receipt of a cell association establishment message from the network element 955, if the user equipment 905 is in the idle state. The user equipment further includes a priority request module 913 configured to seek the connection having the certain priority, if the user equipment 905 is in the active state instead of the initial idle state, by providing a session initiation protocol message to the network element 955, wherein the communication module 911 is further configured to use the connection having the certain priority after both the network element 955 and a core network have marked or dedicated a bearer for the connection having the certain priority. It should be understood that the initial idle state lacks a connection having any priority and the initial active state includes a connection having a priority lower than the certain priority, until the connection having the priority lower than the certain priority is assigned the certain priority. The user equipment 905 also includes a stop module 920 configured to send a session initiation protocol message from the user equipment 905 to stop, terminate or release the connection having the certain priority.
Each of the embodiments described herein can be implemented using a general purpose or specific-use computer system, with standard operating system software conforming to the method described herein. The software is designed to drive the operation of the particular hardware of the system, and will be compatible with other system components and input/output controllers. The computer system includes a processor including a single processing unit, multiple processing units capable of parallel operation, or the processor can be distributed across one or more processing units in one or more locations (e.g., on a client and server). A memory may include any known type of data storage and/or transmission media, including magnetic media, optical media, Random Access Memory (RAM), Read-Only Memory (ROM), a data cache, a data object, etc. Moreover, similar to the processor, the memory may reside at a single physical location including one or more types of data storage, or be distributed across a plurality of physical systems in various forms.
Turning now to FIGURE 10, illustrated is a system level diagram of a communication system that provides an environment for the application of the principles of the present invention. The communication system includes user equipment UE adapted to communicate with a network element such as a base station (designated "eNB") in a cell that is coupled to a Network Control Element (NCE) such as an access gateway.
The user equipment includes a data processor (designated "DP"), a memory (designated "MEM") that stores programs (designated "PRGM"), a timer (designated "TIMER") and a radio frequency transceiver (designated "TRC") for bidirectional wireless communications with the base station. The base station includes a data processor (also designated "DP"), a memory (also designated "MEM") that stores programs (also designated "PRGM"), and a radio frequency transceiver (also designated "TRC") for bidirectional wireless communications with the user equipment. Additionally, the network control element includes a data processor (also designated "DP"), and a memory (also designated "MEM") that stores programs (also designated "PRGM"). In general, the base station provides the E-UTRAN user plane (e.g., radio link control/media access control/physical) and control plane (e.g., RRC) protocol terminations toward the user equipment. The base station communicates with the network control element via an S 1 interface or communication link, and may be interconnected via an X2 interface or communication link to another base station (not shown). The memory as introduced hereinabove may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. The data processors may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, Digital Signal Processors (DSPs) and processors based on a multi-core processor architecture, as non-limiting examples. The programs includes program instructions that, when executed by the associated data processor, enable the electronic device to perform tasks as described herein. Exemplary embodiments of the system, subsystems and modules as described herein may be implemented at least in part by computer software executable by the data processors of the user equipment and base stations, or by hardware, or combinations thereof.
A method, user equipment, network device, and software product enable a user equipment to establish a high priority connection with a UTRAN, E-UTRAN, or other communication networks, from either an active or an idle state. This connection will be established even if it causes lower priority connections to be dropped. A session initiation protocol message is used to terminate the high priority connection, while maintaining any other bearers that the user equipment may be using.
As described above, the exemplary embodiment provides both a method and corresponding apparatus consisting of various modules providing functionality for performing the steps of the method. The modules may be implemented as hardware (including an integrated circuit), or may be implemented as software or firmware for execution by a computer processor. In particular, in the case of firmware or software, the exemplary embodiment can be provided as a computer program product including a computer readable storage structure embodying computer program code (i.e., software or firmware) thereon for execution by the computer processor.
Although the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims. For example, many of the processes discussed above can be implemented in different methodologies and replaced by other processes, or a combination thereof, to establish and release a certain priority for user equipment in an idle state, or initially in an active state without the certain priority, as described herein. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.

Claims

WHAT IS CLAIMED IS:
1. An apparatus, comprising: a connection request module configured to initiate a random access channel indication message followed by a cell association request message to a network element to establish a certain priority for a connection for an idle state; and a priority request module configured to initiate a session initiation protocol message to said network element to establish a certain priority for a connection for an active state.
2. The apparatus as recited in Claim 1 further comprising a prioritization module configured to detect a preference for a connection having a certain priority for said apparatus.
3. The apparatus as recited in Claim 1 further comprising a communication module configured to receive a cell association establishment message from said network element in accordance with a cell radio network temporary identity.
4. The apparatus as recited in Claim 1 further comprising a communication module configured to use said connection having said certain priority after said network element marks a bearer therefor.
5. The apparatus as recited in Claim 1 further comprising a stop module configured to send a session initiation protocol message to said network element to release said connection having said certain priority.
6. The apparatus as recited in Claim 1 wherein said connection is for an emergency session on behalf of said apparatus.
7. The apparatus as recited in Claim 1 wherein said active state initially includes a connection having a priority lower than said certain priority for said connection.
8. An apparatus, comprising: means for detecting a preference for a connection having a certain priority for said apparatus; means for initiating a random access channel indication message followed by a cell association request message to a network element to establish a certain priority for a connection for an idle state; and means for initiating a session initiation protocol message to said network element to establish a certain priority for a connection for an active state.
9. The apparatus as recited in Claim 8 further comprising means for receiving a cell association establishment message from said network element in accordance with a cell radio network temporary identity.
10. The apparatus as recited in Claim 8 further comprising means for sending a session initiation protocol message to said network element to release said connection having said certain priority.
11. A computer program product comprising program code stored in a computer readable medium configured to detect a preference for a connection having a certain priority for a user equipment, initiate a random access channel indication message followed by a cell association request message to a network element to establish a certain priority for a connection for an idle state of said user equipment, and initiate a session initiation protocol message to said network element to establish a certain priority for a connection for an active state of said user equipment.
12. The computer program product as recited in Claim 11 wherein said program code stored in said computer readable medium is configured to receive a cell association establishment message from said network element in accordance with a cell radio network temporary identity.
13. The computer program product as recited in Claim 11 wherein said program code stored in said computer readable medium is configured to send a session initiation protocol message to said network element to release said connection having said certain priority.
14. A method, comprising: initiating a random access channel indication message followed by a cell association request message to a network element to establish a certain priority for a connection for an idle state of a user equipment; and initiating a session initiation protocol message to said network element to establish a certain priority for a connection for an active state of said user equipment.
15. The method as recited in Claim 14 further comprising detecting a preference for a connection having a certain priority for said user equipment.
16. The method as recited in Claim 14 further comprising receiving a cell association establishment message from said network element in accordance with a cell radio network temporary identity.
17. The method as recited in Claim 14 further comprising using said connection having said certain priority after said network element marks a bearer therefor.
18. The method as recited in Claim 14 further comprising sending a session initiation protocol message to said network element to release said connection having said certain priority.
19. The method as recited in Claim 14 wherein said connection is for an emergency session on behalf of said user equipment.
20. The method as recited in Claim 14 wherein said active state initially includes a connection having a priority lower than said certain priority for said connection.
21. An apparatus, comprising: an idle state receiver module configured to receive a random access channel indication message followed by a cell association request message from a user equipment in an idle state to establish a certain priority for a connection with said user equipment; and an active state receiver module configured to receive a session initiation protocol message from said user equipment in an active state to establish a certain priority for a connection with said user equipment.
22. The apparatus as recited in Claim 21 further comprising a transmitter module configured to send a cell association establishment message for said connection having said certain priority in response to said cell association request message.
23. The apparatus as recited in Claim 21 further comprising a marking module configured to mark a bearer for said connection having said certain priority in response to said session initiation protocol message.
24. The apparatus as recited in Claim 21 further comprising a processing module configured to process a session initiation protocol message from said user equipment to release said connection having said certain priority.
25. The apparatus as recited in Claim 21 wherein said connection is for an emergency session on behalf of said user equipment.
26. A method, comprising: receiving a random access channel indication message followed by a cell association request message from a user equipment in an idle state to establish a certain priority for a connection with said user equipment; and receiving a session initiation protocol message from said user equipment in an active state to establish a certain priority for a connection with said user equipment.
27. The method as recited in Claim 26 further comprising sending a cell association establishment message for said connection having said certain priority in response to said cell association request message.
28. The method as recited in Claim 26 further comprising marking a bearer for said connection having said certain priority in response to said session initiation protocol message.
29. The method as recited in Claim 26 further comprising processing a session initiation protocol message from said user equipment to release said connection having said certain priority.
30. The method as recited in Claim 26 wherein said connection is for an emergency session on behalf of said user equipment.
31. A communication system, comprising: a user equipment, including: a prioritization module configured to detect a preference for a connection having a certain priority for said user equipment; a connection request module configured to initiate a random access channel indication message followed by a cell association request message to a network element to establish a certain priority for a connection for an idle state, and a priority request module configured to initiate a session initiation protocol message to said network element to establish a certain priority for a connection for an active state; and a network element, comprising: an idle state receiver module configured to receive said random access channel indication message followed by said cell association request message from said user equipment in said idle state to establish a certain priority for a connection with said user equipment, and an active state receiver module configured to receive said session initiation protocol message from said user equipment in said active state to establish a certain priority for a connection with said user equipment.
32. The communication system as recited in Claim 31 wherein said user equipment includes a communication module configured to receive a cell association establishment message from said network element in accordance with a cell radio network temporary identity.
33. The communication system as recited in Claim 31 wherein said user equipment includes a communication module configured to use said connection having said certain priority after said network element marks a bearer therefor.
34. The communication system as recited in Claim 31 wherein said user equipment includes a stop module configured to send a session initiation protocol message to said network element to release said connection having said certain priority.
35. The communication system as recited in Claim 31 wherein said network element includes: a transmitter module configured to send a cell association establishment message for said connection having said certain priority in response to said cell association request message, a marking module configured to mark a bearer for said connection having said certain priority in response to said session initiation protocol message, and a processing module configured to process a session initiation protocol message from said user equipment to release said connection having said certain priority.
PCT/IB2008/050908 2007-03-13 2008-03-12 System for establishing and controlling emergency priority in a communication system WO2008111001A2 (en)

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