EP1563704A1 - Procede et systeme d'evitement de defaillances - Google Patents

Procede et systeme d'evitement de defaillances

Info

Publication number
EP1563704A1
EP1563704A1 EP03797774A EP03797774A EP1563704A1 EP 1563704 A1 EP1563704 A1 EP 1563704A1 EP 03797774 A EP03797774 A EP 03797774A EP 03797774 A EP03797774 A EP 03797774A EP 1563704 A1 EP1563704 A1 EP 1563704A1
Authority
EP
European Patent Office
Prior art keywords
paging
message
type
messages
network element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03797774A
Other languages
German (de)
English (en)
Inventor
Pontus Wallentin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP1563704A1 publication Critical patent/EP1563704A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like

Definitions

  • the present invention relates to transmissions and retransmissions in a communications system. Especially, it re- lates to radio link transmissions and avoidance of message transmission failures, such as paging failures, in a cellular mobile radio system, particularly a Universal Mobile Telecommunications System, UMTS, or WCDMA system.
  • a cellular mobile radio system particularly a Universal Mobile Telecommunications System, UMTS, or WCDMA system.
  • radio communications system such as UMTS
  • mobile stations and user equipment are paged when there is an incoming call.
  • Paging is commonly initiated from a controlling element of a radio access network, such as a radio network controller, RNC.
  • RNC radio network controller
  • a radio network controller is understood as a network element including an RRM (Radio Resource Management) entity.
  • the RNC is connected to a fixed network.
  • Node B is a logical node responsible for radio transmission/reception in one or more cells to/from a User Equipment.
  • a base station, BS is a physical entity representing Node B.
  • base stations «BS 1» and «BS 2» are physical entities representing Nodes B «Node B 1» and «Node B 2» respectively.
  • «Node B 1» and «Node B 2» termi- nate the air interface, called Uu interface within UMTS, between UE and respective Node B towards the radio network controller «RNC».
  • «RNC» is connected to a fixed network «Network» .
  • the base stations are connected to the same radio network controller RNC.
  • RNC radio network controller
  • this specification also covers the exemplary situation where the base stations are connected to different RNCs .
  • the RLC protocol is terminated in a serving RNC, SRNC, responsible for interconnecting the radio access network of UMTS to a core network «Network».
  • 3GPP 3 rd Generation Partnership Project
  • 3GPP Technical Speci fication Group Radio Access Network, Radio Interface Proto- col Archi tecture, 3GPP TS 25. 301 v3 . 6. 0, France, September 2000, describes an overall protocol structure of a Universal Mobile Telecommunications System (UMTS) .
  • UMTS Universal Mobile Telecommunications System
  • Layer 2 , L2 , and layer 3 , L3 are divided into Control and
  • Layer 2 consists of two sub-layers, RLC and
  • BMC Control Plane
  • PDCP Physical Downlink Control Plane
  • RLC Radio Link Control Protocol
  • MAC User Plane
  • RLC and MAC denote Broadcast/Multicast Control, Packet Data Convergence Protocol, Radio Link Control and Medium Access Control respectively.
  • Figure 2 displays a simplified UMTS layers 1 and 2 protocol structure for a Uu Stratum, UuS, or Radio Stratum, between a User Equipment UE and a Universal Terrestrial Radio Access Network, UTRAN.
  • Radio Access Bearers are associated with the application for transportation of services between core network, CN, and user equipment, UE, through a radio access network.
  • Each RAB is associated with quality attributes such as service class, guaranteed bit rate, transfer delay, residual BER, and traffic handling priority.
  • An RAB may be assigned one or more Radio Bearers, RBs, being responsible for the transportation between UTRAN and UE.
  • RBs Radio Bearers
  • Data flows (in the form of segments) of the RBs are passed to respective Radio Link Control, RLC, entities which amongst other tasks buffer the received data seg- ments.
  • RLC Radio Link Control
  • RBs are mapped onto respective logical channels.
  • a Medium Access Control, MAC, entity receives data transmitted in the logical channels and further maps logical channels onto a set of transport channels.
  • MAC should support service multiplexing e.g. for RLC services to be mapped on the same transport channel. In this case identification of multiplexing is contained in the MAC protocol control information.
  • Transport channels are finally mapped to a single physical channel which has a total bandwidth allocated to it by the network.
  • a physical channel is defined by code, frequency and, in the uplink, relative phase (I/Q) .
  • time division duplex mode a physical channel is defined by code, frequency, and time- slot.
  • the Ll layer is responsible for error detection on transport channels and indication to higher layer, FEC encoding/decoding and interleav- ing/deinterleaving of transport channels.
  • 3GPP Technical Speci fication Group Radio Access Network, Radio Link Control (RLC) protocol specification
  • 3GPP TS 25.322 v4 . 4. 0, France, March 2002 specifies the RLC protocol.
  • the RLC layer provides three services to the higher layers:
  • TM transparent mode
  • UM unacknowledged mode
  • AM acknowledged mode
  • 3GPP 3 rd Generation Partnership Project
  • 3GPP Technical Speci - fication Group Radio Access Network, Radio Link Control (RLC) protocol specification
  • 3GPP TS 25 . 331 v3 . 9 . 0 , France, December 2001 specifies radio resource control, RRC, protocol.
  • Section 8.1.2 describes paging and section 8.3.1 describes cell and UTRAN registration area, URA, up- date procedures.
  • Section 8.5.6 describes radio link failure criteria and actions upon radio link failure.
  • Section 10.2.20 describes Paging Type 1, using PCCH (Paging Control Channel), and Paging Type 2, using DCCH (Dedicated Control Channel), messages for paging.
  • Section 10.3.3.47 briefly describes u-RNTI (UTRAN Radio Network Temporary Identity) being allocated to a UE having an RRC connection and identifying the UE within UTRAN.
  • u-RNTI UTRAN Radio Network Temporary Identity
  • paging messages are transferred to a Node B communicating with the UE (in states CELL_DCH, CELL_FACH or CELL_PCH) or to one or more Nodes B in one or more areas where UE is expected to be (in state URA_PCH) .
  • 3GPP 3 rd Generation Partnership Project
  • 3GPP TS 25. 401 v3 . 6. 0, France, March 2001 comprises an overall description of UTRAN. Among other things it de- scribes in section 6.1.7 UE identifiers.
  • radio network temporary identifiers There are four types of radio network temporary identifiers, RNTIs,
  • s-RNTI Serving RNC RNTI
  • Drift RNC RNTI (d-RNTI); 3. Cell RNTI (c-RNTI);
  • UTRAN RNTI (u-RNTI) .
  • s-RNTI is used by UE to uniquely identify itself to a Serving RNC, SRNC. It is also used by SRNC to address the UE and by Drift RNC, DRNC, to identify the UE to Serving RNC. s-RNTI is allocated for all UEs having an RRC connection. s-RNTI is reallocated when the SRNC for an RRC connection is changed.
  • a UE context is defined in SRNC. The UE context encompasses a state (CELL_DCH, CELL_FACH, CELL_PCH or URA_PCH state) .
  • d-RNTI is used by serving RNC to identify the UE to Drift RNC, DRNC.
  • the d-RNTI is never used on radio interface Uu.
  • d-RNTI is allocated by DRNC upon UE contexts establishment and it shall be unique within the DRNC.
  • Serving RNC shall know the mapping between s-RNTI and the d-RNTIs allocated in DRNCs for the same UE.
  • DRNC shall know the s-RNTI and SRNC-ID related to existing d-RNTI within the DRNC.
  • c-RNTI is used by UE to identify itself to controlling RNC, CRNC, and by CRNC to address the UE. It is allocated by CRNC upon UE accessing a new cell. c-RNTI shall be unique within the accessed cell. CRNC shall know the d-RNTI associated to the c-RNTI within the same logical RNC (if any) . For the initial access a unique core network UE identifier is used. c-RNTI is used as a UE identifier in all other DCCH/DTCH common channel messages on air interface. u-RNTI is allocated to a UE having an RRC connection and identifies the UE within UTRAN. u-RNTI is composed of SRNC identity and s-RNTI.
  • u-RNTI is used as a UE identifier for the first cell access (at cell change) when an RRC connection exists for the UE and for UTRAN originated paging including associated response messages.
  • RNC-ID is used by Controlling RNC to route the received uplink messages towards SRNC.
  • Figure 3 illustrates Paging Type 1 message elements accord- ing to 3GPP TS 25.331 v3. .0. This message is used to send information on the paging channel.
  • Message Type is a message type defined for the logical channel type (Paging Control Channel, PCCH, for Paging Type 1.
  • PCCH Policy Control Channel
  • «Paging Record List» comprises an integer between 1 and 8, indicating the number of UEs paged in the Paging Type 1 message and also indicating the number of paging records «Paging Record» in the Paging Type 1 message.
  • Each paging record comprises paging cause, CN domain identity, UE identity (IMSI (GSM-MAP) , TMSI (GSM-MAP/P- TMSI (GSM-MAP) , IMSKDS-41) or TMSI (DS-41) ) , u-RNTI and CN originated page to connected mode UE (including paging cause, CN domain identity and paging record type identifier described below in relation to figure 4) .
  • IMSI GSM-MAP
  • TMSI GSM-MAP/P- TMSI (GSM-MAP)
  • u-RNTI a page to connected mode UE (including paging cause, CN domain identity and paging record type identifier described below in relation to figure 4) .
  • the information element «BCCH modification info» is contained in a PAGING TYPE 1 message transmitted on the PCCH in all paging occasions in the cell.
  • MIB Master Information Block
  • BCCH BCCH modification time
  • Figure 4 illustrates Paging Type 2 message elements according to 3GPP TS 25.331 v3. .0.
  • This message is used to page a UE in connected mode, when using the DCCH for CN originated paging.
  • the information element «RRC transaction identifier» may be used, together with information element «Message Type», for identification of an invocation of a downlink procedure (transaction) as specified in section 8.3.6.11 of 3GPP TS 25.331 v3.9.0.
  • «Integrity Check Info» comprises, e.g., an information element with authentication code. If no Integrity Check Info is present, the message is discarded.
  • «Paging Cause» and «Paging Record Type ID» are forwarded to higher layers.
  • Paging cause is an enumerated reference representing e.g. terminating conversational, streaming, interactive or background call.
  • «CN Domain ID» indicates whether core network domain is Circuit Switched or Packet Switched. The information is routed to higher layers .
  • Paging Record Type ID is an enumerated information element representing e.g. IMSI (GSM-MAP) , TMSI (GSM-MAP) /P-TMSI, IMSI(DS-41) or TMSI .
  • 3GPP 3 rd Generation Partnership Project
  • 3GPP Technical Speci - fication Group Radio Access Network, UTRAN Iur interface RNSAP signaling, 3GPP TS 25. 423 v3.6. 0 , France, June 2001 , comprises an overall description of the Iur signaling protocol RNSAP (Radio Network System Application Part) .
  • RNSAP Radio Network System Application Part
  • a UE Context contains the necessary information for a Drift RNC, DRNC, to communicate with a specific UE.
  • the UE Context is created by a Radio Link Setup procedure or by an Uplink Signaling Transfer procedure when UE makes its first access in a cell controlled by the DRNS .
  • the UE Context is deleted by the Radio Link Deletion procedure, by the Common Transport Channel Resources Release procedure, or by the Downlink Signaling Transfer procedure when neither any Ra- dio Links nor any common transport channels are established for the UE concerned.
  • Japanese Patent Application JP2001352570 reveals transmission of URA paging to a drift base-station control station and a mobile station, and after cell update transmission of a paging message from the drift base-station control station to the mobile station.
  • None of the cited documents above discloses a method and system, particularly for paging, providing avoidance of failure or locking due to state inconsistency. Specifically, none of the cited documents reveals a method and system of transmitting different paging messages during different time intervals or transmitting information elements enabling reception of paging messages.
  • Radio link failure and during cell update there is an uncertainty as to whether a mobile station or User Equip- ment can receive information transmitted from a base station or Node B to which it is connected, or at least was prior to the radio link failure.
  • Paging Type 1 paging Type 1
  • Paging Type 2 paging Type 2
  • state inconsistency between user equipment and RNC causes problems. According to prior art there is a risk of RNC operating as if the user equipment were operating in one mode, whereas it is actually operating in an- other mode.
  • Another problem occurs due to a User Equipment, which does not receive signals carrying parameters sent from RNC, cannot properly receive messages, such as paging messages, transmitted later on and requiring this information.
  • Another object is to page User Equipment on shared or common control channels other than paging control channel, PCCH.
  • a further object is to assign proper control channel and transmission mode for transport of the required one or more information elements .
  • a still further object is to relate paging message type to state changes and state periods.
  • Figure 1 shows communication between a UE and a base station involved in a connection between an RNC and the UE.
  • Figure 2 displays a layered protocol structure, according to prior art, in a radio communications system.
  • FIG. 3 illustrates Paging Type 1 message elements according to prior art.
  • FIG. 4 illustrates Paging Type 2 message elements according to prior art.
  • Figure 5 illustrates a timing diagram of a successful cell update at an exemplary radio link failure.
  • Figure 6 shows a timing diagram of an unsuccessful cell update when a User Equipment cannot be reached within preset time limit and maximum number of cell update attempts at an exemplary radio link failure.
  • Figure 7 depicts a timing diagram of an unsuccessful cell update when a suitable cell is not found within prescribed time limit at an exemplary radio link failure.
  • Figure 8 illustrates paging and problems related with pag- ing and state and mode inconsistencies.
  • Figure 9 displays a flowchart schematically illustrating paging according to a first embodiment of the invention.
  • Figure 10 shows a flowchart schematically illustrating paging according to a second embodiment of the invention.
  • Figure 11 illustrates Paging Type 2 message elements according to a fourth and fifth embodiment of the invention.
  • paging messages and other messages are transmitted over the radio interface between «UE/Client Device» and «BS 2 /Node B 2».
  • Paging messages are transmitted in downlink direction.
  • «BS 2 /Node B 2» represents the receiver side of the radio interface and in downlink direction receiver side is represented by «UE/Client Device» and «BS 2 /Node B 2» is on the transmitter side.
  • Paging is commonly initiated from a controlling element of a radio access network, such as a radio network controller «RNC».
  • FIG. 5 illustrates a timing diagram of a successful cell update at an exemplary radio link failure.
  • An established radio link is considered to be out of sync when received signal quality deteriorates below a specified level for a specified time.
  • UE User Equipment
  • FIG 5 a User Equipment «UE» detects downlink criteria for out-of-sync being fulfilled and registers a radio link failure.
  • RAB Radio Access Bearer
  • the RAB is associated with a first timer «T315».
  • User Equipment «UE» will start the first timer «T315» when it detects a radio link failure. From the use of timer «T315», User Equipment «UE» can be guaranteed to enter idle mode if it does not recover from the radio link failure within a prescribed time interval. The timer «T315» is stopped, and possibly reset, if the recovery is successful. In the case illustrated this occurs when cell update is confirmed.
  • Node B sends a radio link failure indication «Radio Link Failure Indication» to radio network controller «RNC».
  • «UE» When «UE» starts a cell update procedure in response to the radio link failure criteria being fulfilled, it sends a cell update message «Cell Update», destined for radio network controller «RNC» and transmitted over «Node B».
  • the User Equipment «UE» enters Forward Access Channel state «Cell_FACH», sets a counter «V302» to 1 and starts a second timer «T302».
  • Both first and second timers «T315, T302» are stopped when User Equipment «UE» receives a cell update confirm message «Cell Update Confirm» from radio network controller «RNC».
  • an exemplary physical channel reconfiguration complete message destined for «RNC» is sent over «Node B», completing the cell update procedure.
  • User Equipment «UE» checks the counter «V302», which is increased by one for each transmitted cell update message «Cell Update». If the present value of the counter «V302» is not greater than a preset threshold value «N302», it transmits a second cell update message «Cell Update» and increases the counter «V302» by one and the second timer «T302» is restarted.
  • Further cell update messages may be transmitted each time the second timer «T302» elapses after a restart at transmission of a cell update message «Cell Update» as long as the preset threshold value is not exceeded by the counter «V302». If the present value of the counter «V302» becomes greater than the preset threshold value «N302», User Equipment «UE» enters idle mode. Exemplary time intervals for this to occur are between 0.1 s and 64 s.
  • Figure 7 depicts a timing diagram of an unsuccessful cell update when a suitable cell is not found prior to the first timer «T315» timing out after a prescribed time interval at an anticipated radio link failure. Exemplary time intervals are in the range 1800 s (30 min) or shorter.
  • a radio link failure message is transmitted from «Node B» to radio network controller «RNC» as in figures 5 and 6.
  • UTRAN uncertainties as regards UE operating modes, such as connected mode and idle mode, and different states, such as CELL_FACH state and CELL_DCH state, entail problems when it comes message transmissions from Universal Terrestrial Radio Access Network, UTRAN, e.g. when paging for incoming calls.
  • paging messages are used to illustrate such messages.
  • RNC Radio Network Controller
  • IMSI International Mobile Subscriber Identity
  • TMSI Temporal Mobile Subscriber Identity
  • Subscriber Identity for selection of appropriate paging method are included.
  • IMSI IMSI
  • RNC assumes that UE is in idle mode and prepares paging using a Paging Type 1 message, paging User Equipment by the CN user equipment identity, such as IMSI, TMSI or P-TMSI.
  • RNC If RNC does have a context for received user equipment identity, RNC either sends a Paging
  • Type 1 or a Paging Type 2 message :
  • a Paging Type 2 message is typically sent to UE on DCCH.
  • DCCH is mapped to FACH or DCH.
  • a Paging Type 1 message is generally sent on PCCH, paging User Equipment by u-RNTI .
  • PCCH is mapped to PCH.
  • DCCH is a dedicated control channel messages transmitted on this channel are received only by the dedicated destination, whereas messages transmitted on a broadcast channel such as PCCH are received by all User Equipments camping on the cell where the message is transmitted.
  • UE When UE is in connected mode, it listens for both Paging Type 1 and Paging Type 2 messages, whereas according to existing standardization, it is only required to listen to Paging Type 1 messages with CN user equipment identity (IMSI, TMSI, P-TMSI) on PCCH in idle mode.
  • IMSI CN user equipment identity
  • TMSI TMSI
  • P-TMSI CN user equipment identity
  • Radio link failure there is a risk of RNC acting as if UE were in connected mode and since UE context is available either a Paging Type 1 message or a Paging Type 2 message is transmitted as explained above.
  • an RNC timer corresponding to the first timer «T315» in UE, started when the radio link failure is detected in RNC has elapsed, the UE context is deleted, and consequently only Paging Type 1 messages will be transmitted for paging.
  • a problem is related to whether UE is in connected mode or idle mode. Even if the RNC timer has not elapsed, UE may have entered idle mode already. The reason may be, e.g., the retransmission counter «V302» increasing beyond the threshold value «N302». If this is the case, it will ignore paging with Paging Type 1 messages for u-RNTI or with Paging Type 2 messages . This may occur in the exemplary situation illustrated in figure 6.
  • Cell Update Confirm is not detected at UE, e.g. due to different cell sizes for uplink and downlink.
  • UTRAN may detect signals from UE on Random Access Channel, RACH, and simultaneously UE cannot detect signals from UTRAN on Forward Access Channel, FACH.
  • RNC were forced to page with Paging Type 1 messages for CN user equipment identity (IMSI, TMSI or P-TMSI) during cell update procedure this would be ignored by UE.
  • IMSI CN user equipment identity
  • P-TMSI CN user equipment identity
  • UE After transmitting a Cell Update message at radio link failure UE will enter CELL_FACH state. In this state paging with one or more Paging Type 2 messages is required to be sent on DCCH and in acknowledged mode .
  • Paging using paging type 2 messages of prior art requires the paged UE to have received its c-RNTI (Cell Radio Network Temporary Identity) used as identity in MAC for RLC PDU for identification of one or more RLC PDUs containing the one or more Paging Type 2 messages and their acknowledgements.
  • c-RNTI Cell Radio Network Temporary Identity
  • c-RNTI is assigned to UE in a Cell Update Confirm message «Cell Update Confirm». If this message is not received in UE, as illustrated in figure 6, UE cannot detect Paging Type 2 messages.
  • RNC after reception of an NBAP message Radio Link Failure, RNC will page both using Paging Type 2 message and Paging Type 1 message paging UE by u- RNTI while a timer «T315'» in RNC, corresponding to UE timer «T315», has not yet elapsed.
  • RNC will page using Paging Type 1 message paging UE by CN user equipment identity, e.g. IMSI, TMSI or P- TMSI.
  • RNC will remove UE context. This is illustrated in figure 9.
  • N302 is the predetermined limit on number of retransmissions and TO T3 o 2 is a predetermined time-out interval of timer T302.
  • RNC When timer Tremax times out, RNC will remove UE context and only page using Paging Type 1 message paging UE by CN user equipment identity (e.g. IMSI, TMSI or P-TMSI) .
  • CN user equipment identity e.g. IMSI, TMSI or P-TMSI
  • the Cell Update Confirm message is modified to carry a paging indicator.
  • This paging indicator comprises information of the paging record type identifier of a Paging Type 2 message.
  • the paging indicator is included as an Information Element, in addition to other existing Information Elements.
  • RNC can forward paging in the Cell Update Confirm message.
  • UE receives the Cell Update Confirm message it forwards the pag- ⁇ ' ing indicator to upper layers as for a Paging Type 1 or Paging Type 2 message .
  • a Paging Type 2 message is transmitted in unacknowledged mode, as opposed to acknowledged mode transmissions in prior art.
  • c-RNTI is not needed in UE and u-RNTI can be used as MAC header for the Paging Type 2 message transmitted on the DCCH.
  • u-RNTI is included as an Information Element in the RRC protocol and Paging Type 2 messages in accordance with the protocol. Further, Paging Type 2 mes- sages are preferably transmitted unencrypted.
  • Paging Type 2 messages can be transmitted on CCCH, for which reason also user equipment in idle mode can detect the paging messages.
  • Figure 11 illustrates message elements of a Paging Type 2 message according to the fourth and fifth embodiments of the invention.
  • the Paging Type 2 message according to the embodiments of the invention includes element «u- RNTI», representing u-RNTI of paged User Equipment.
  • all system elements such as UEs and RNCs in UMTS, where applicable operate according to the invention.
  • the invention can also be used in systems also including some equipment, such as UEs and RNCs, not operating according to the invention.

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

Abstract

La présente invention concerne les transmissions et les retransmissions dans un système de communication. Elle concerne notamment les transmissions par liaison radio et l'évitement de défaillances de transmission de messages, telles que des défaillances de radio messagerie, dans un système radio cellulaire mobile, en particulier un système universel de télécommunication mobile, UMTS, ou un système ARMC large bande.
EP03797774A 2002-09-17 2003-09-16 Procede et systeme d'evitement de defaillances Withdrawn EP1563704A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0202782 2002-09-17
SE0202782A SE0202782D0 (sv) 2002-09-17 2002-09-17 Method and system of failure avodance
PCT/SE2003/001447 WO2004028196A1 (fr) 2002-09-17 2003-09-16 Procede et systeme d'evitement de defaillances

Publications (1)

Publication Number Publication Date
EP1563704A1 true EP1563704A1 (fr) 2005-08-17

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Application Number Title Priority Date Filing Date
EP03797774A Withdrawn EP1563704A1 (fr) 2002-09-17 2003-09-16 Procede et systeme d'evitement de defaillances

Country Status (4)

Country Link
EP (1) EP1563704A1 (fr)
AU (1) AU2003261054A1 (fr)
SE (1) SE0202782D0 (fr)
WO (1) WO2004028196A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100433903C (zh) * 2005-03-04 2008-11-12 中兴通讯股份有限公司 移动终端的状态迁移方法
GB2440577B (en) * 2006-07-28 2011-06-29 Nec Technologies Trigger of inter-frequency measurements within mobile radio communications device
ES2344376T3 (es) 2007-05-06 2010-08-25 Innovative Sonic Limited Procedimiento para la transmision de informacion de paginacion para un sistema de comunicaciones inalambricas y aparato asociado.
US8498608B2 (en) * 2010-01-19 2013-07-30 Htc Corporation Method of network paging user equipment for error recovery in wireless communication system and related communication device

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JP2796464B2 (ja) * 1991-12-27 1998-09-10 株式会社日立製作所 無線通信システム、および、無線通信方法
SE9304119D0 (sv) * 1993-12-10 1993-12-10 Ericsson Ge Mobile Communicat Apparatuses and mobile stations for providing packet data communication in digital TDMA cellular systems
US6175557B1 (en) * 1994-10-31 2001-01-16 Telefonaktiebolaget Lm Ericsson (Publ) Layer 2 protocol in a cellular communication system
SE517215C2 (sv) * 1998-03-20 2002-05-07 Ericsson Telefon Ab L M Ett system och ett förfarande relaterande till paketdatakommunikation
SE522378C2 (sv) * 1998-11-09 2004-02-03 Telia Ab Effektiva lägeshanteringsstrategier i ett UMTS-baserat nät
JP4291946B2 (ja) * 1999-10-21 2009-07-08 ユーティースターコム コリア リミテッド 非同期移動通信システム

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SE0202782D0 (sv) 2002-09-17
AU2003261054A1 (en) 2004-04-08

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