US20080232313A1 - Method for Enhancing Data Transmission Efficiency for a Radio Resource Control Procedure for a Wireless Communications System and Related Apparatus - Google Patents

Method for Enhancing Data Transmission Efficiency for a Radio Resource Control Procedure for a Wireless Communications System and Related Apparatus Download PDF

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Publication number
US20080232313A1
US20080232313A1 US12/050,177 US5017708A US2008232313A1 US 20080232313 A1 US20080232313 A1 US 20080232313A1 US 5017708 A US5017708 A US 5017708A US 2008232313 A1 US2008232313 A1 US 2008232313A1
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rnti
high speed
dedicated
speed downlink
cell
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US12/050,177
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Richard Lee-Chee Kuo
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Innovative Sonic Ltd
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Innovative Sonic Ltd
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Priority to US12/050,177 priority Critical patent/US20080232313A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • the present invention relates to a method for enhancing data transmission efficiency for a wireless communications system and related communications device, and more particularly to a method for enhancing data transmission efficiency with a high speed downlink operation for a radio resource control procedure in a wireless communications system and related communications device.
  • the third generation (3G) mobile telecommunications system has adopted a Wideband Code Division Multiple Access (WCDMA) wireless air interface access method for a cellular network.
  • WCDMA Wideband Code Division Multiple Access
  • the WCDMA method also meets all kinds of QoS requirements simultaneously, providing diverse, flexible, two-way transmission services and better communication quality to reduce transmission interruption rates.
  • a wireless communications device such as a mobile phone, to realize real-time video communications, conference calls, real-time games, online music broadcasts, and email sending/receiving.
  • these functions rely on fast, instantaneous transmission.
  • High Speed Package Access technology, which includes High Speed Downlink Package Access (HSDPA) and High Speed Uplink Package Access (HSUPA), to increase bandwidth utility rate and package data processing efficiency to improve uplink/downlink transmission rate.
  • HSPA High Speed Package Access
  • HSDPA High Speed Downlink Package Access
  • HSUPA High Speed Uplink Package Access
  • the 3GPP further introduces HS-DSCH reception in a CELL_FACH state allowing the UE in the CELL_FACH state to monitor a High Speed Downlink Shared Channel (HS-DSCH) accompanied with a Shared Control Channel for HS-DSCH (HS-SCCH) for downlink data reception, so as to improve a peak data rate, a signaling delay, a state transition delay, download times and flexible cell capacity.
  • HS-DSCH High Speed Downlink Shared Channel
  • HS-SCCH Shared Control Channel for HS-DSCH
  • a UMTS radio access network enables the HS-DSCH reception in the CELL_FACH state by including parameters, related to radio resource control (RRC) configuration of HS-SCCH, HS-DSCH and a common HS-DSCH radio network transaction identifier (common H-RNTI), in the system information broadcast.
  • RRC radio resource control
  • the parameters are configured in a “Downlink HS-PDSCH system information” information element (IE) included in a system information block (SIB) type 5/5bis.
  • SIB system information block
  • the parameters are configured in a “Downlink HS-PDSCH system information for connected mode” IE included in an SIB type 6.
  • the UE may use a common or a dedicated H-RNTI to perform the HS-DSCH reception in the CELL_FACH state.
  • the common and dedicated H-RNTIs are both used as an identity of the UE so that the UE can receive its own packets.
  • the common H-RNTI can be shared by multiple UEs, whereas each dedicated H-RNTI is only allocated to one UE.
  • UE identification information i.e. UE ID and UE ID Type
  • the MAC packets for the UE using the dedicated H-RNTI include no UE identification information to provide better data transmission efficiency.
  • the UE selects a suitable common H-RNTI to use from the common H-RNTI parameter.
  • the UTRAN attempts to allocate a dedicated H-RNTI to the UE, the UTRAN sends a related configuration through RRC procedures, such as an RRC connection or a cell update procedure, and the UE stores the configuration in a H-RNTI variable.
  • RRC procedures such as an RRC connection or a cell update procedure
  • the UE stores the configuration in a H-RNTI variable.
  • the UE uses the dedicated H-RNTI if the H-RNTI variable is set; otherwise the UE uses the common H-RNTI.
  • the UE has an HS_DSCH_RECEPTION_CELL_FACH_STATE and an HS_DSCH_RECEPTION_OF_CCCH variable revealing a use state of the dedicated and common H-RNTIs, respectively.
  • the HS_DSCH_RECEPTION_CELL_FACH_STATE variable is set to “TRUE”
  • the UE receives packets mapped to a Dedicated Traffic Channel (DTCH) and a Dedicated Control Channel (DCCH) according to the dedicated H-RNTI.
  • DTCH Dedicated Traffic Channel
  • DCCH Dedicated Control Channel
  • the HS_DSCH_RECEPTION_OF_CCCH variable is set to “TRUE”
  • the UE receives packets mapped to a Common Control Channel (CCCH) according to the common H-RNTI. If both of the variables are set to “FALSE, this means that the HS-DSCH reception in the CELL_FACH state is deactivated.
  • the UE may initiate the cell update procedure during the HS-DSCH reception in the CELL_FACH state, and the cause to initiate the cell update procedure may be cell reselection, periodical cell update, a radio link failure, an RLC unrecoverable error or uplink data transmission.
  • the UE also initiates a URA update procedure when performing UTRAN registration area reselection (URA Reselection) or a periodical URA update.
  • URA Reselection UTRAN registration area reselection
  • URA Reselection UTRAN registration area reselection
  • the UE sets the HS_DSCH_RECEPTION_OF_CCCH variable to “TRUE”, and starts reception of physical channels (i.e. HS-SCCH and HS-PDSCH) and transport channels (HS-DSCH) according to configuration data of the “Downlink HS-PDSCH system information for connected mode” IE or the “Downlink HS-PDSCH system information” IE.
  • physical channels i.e. HS-SCCH and HS-PDSCH
  • transport channels HS-DSCH
  • the UE of the prior art uses the common H-RNTI for receiving downlink packets when the UE initiates the cell/URA update procedure, irrespective of the procedure initiation cause.
  • the UE uses the dedicated H-RNTI for the HS-DSCH reception in the CELL_FACH state and meanwhile initiates the cell/URA update procedure due to cell/URA reselection or periodical cell/URA update.
  • the procedure initiation cause is cell/URA reselection
  • the dedicated H-RNTI becomes invalid, and thereby the UE clears the dedicated H-RNTI and then changes to use the common H-RNTI.
  • the dedicated H-RNTI is still valid when the procedure initiation cause is periodical cell/URA update, so the UE does not clear the dedicated H-RNTI but also changes to use the common H-RNTI.
  • receiving packets based on the common H-RNTI engages more radio resources than based on the dedicated H-RNTI, since the downlink packets include the UE identification information for the UE using the common H-RNTI, but no UE identification information is included for the UE using the dedicated H-RNTI.
  • the present invention therefore provides a method for a UE in a CELL_FACH state in a wireless communications system and related communications device that utilizes the HS-DSCH reception in the CELL_FACH state for enhancing data transmission efficiency for an RRC update procedure.
  • the present invention discloses a method for enhancing data transmission efficiency for an RRC procedure for a UE in a CELL_FACH state in a wireless communications system.
  • the method includes using a dedicated H-RNTI for a high speed downlink operation corresponding to the CELL_FACH state; initiating an RRC update procedure; changing to use a common H-RNTI for the high speed downlink operation if the dedicated H-RNTI becomes invalid; and continuing using the dedicated H-RNTI for the high speed downlink operation if the dedicated H-RNTI remains effective.
  • the RRC update procedure is preferably a cell or a URA update procedure.
  • the present invention further discloses a communications device in a CELL_FACH state of a wireless communications system for enhancing data transmission efficiency for an RRC procedure.
  • the communications device includes a control circuit, a processor and a memory.
  • the control circuit is used for realizing functions of the communications device.
  • the processor is installed in the control circuit and used for executing a program code to command the control circuit.
  • the memory is installed in the control circuit and coupled to the processor, and used for storing the program code.
  • the program code includes using a dedicated H-RNTI for a high speed downlink operation corresponding to the CELL_FACH state; initiating an RRC update procedure; changing to use a common H-RNTI for the high speed downlink operation if the dedicated H-RNTI becomes invalid; and continuing using the dedicated H-RNTI for the high speed downlink operation if the dedicated H-RNTI remains effective.
  • FIG. 1 is a functional block diagram of a communications device.
  • FIG. 2 is a diagram of the program code shown in FIG. 1 .
  • FIG. 3 is a flowchart diagram of a process according to an embodiment of the present invention.
  • FIG. 1 is a functional block diagram of a communications device 100 .
  • FIG. 1 only shows an input device 102 , an output device 104 , a control circuit 106 , a central processing unit (CPU) 108 , a memory 110 , a program code 112 , and a transceiver 114 of the communications device 100 .
  • the control circuit 106 executes the program code 112 in the memory 110 through the CPU 108 , thereby controlling an operation of the communications device 100 .
  • the communications device 100 can receive signals input by a user through the input device 102 , such as a keyboard, and can output images and sounds through the output device 104 , such as a monitor or speakers.
  • the transceiver 114 is used to receive and transmit wireless signals, delivering received signals to the control circuit 106 , and outputting signals generated by the control circuit 106 wirelessly. From a perspective of a communications protocol framework, the transceiver 114 can be seen as a portion of Layer 1, and the control circuit 106 can be utilized to realize functions of Layer 2 and Layer 3.
  • the communications device 100 is utilized in a HSPA system of a third generation (3G) mobile communications system and supports high speed downlink operation corresponding to a CELL_FACH state including HS-DSCH reception in the CELL_FACH state.
  • FIG. 2 is a diagram of the program code 112 shown in FIG. 1 .
  • the program code 112 includes an application layer 200 , a Layer 3 202 , and a Layer 2 206 , and is coupled to a Layer 1 218 .
  • the Layer 3 202 includes a radio resource control (RRC) entity 222 for controlling the Layer 1 218 and the Layer 2 206 and performing peer-to-peer communication with a network terminal, such as a Node-B or a UTRAN.
  • RRC entity 222 can switch the communications device 100 among the idle mode, CELL_PCH, URA_PCH, CELL_FACH and CELL_DCH states.
  • FIG. 3 illustrates a schematic diagram of a process 30 according to an embodiment of the present invention.
  • the process 30 is applied to a UE of a wireless communications system, and can be compiled into the H-RNTI managing program code 220 .
  • the process 30 includes the following steps:
  • Step 300 Start.
  • Step 302 Use a dedicated H-RNTI for the high speed downlink operation corresponding to a CELL_FACH state.
  • Step 304 Initiate a cell or a URA update procedure due to a procedure initiation cause.
  • Step 306 Change to use a common H-RNTI for the high speed downlink operation if the dedicated H-RNTI becomes invalid due to the procedure initiation cause.
  • Step 308 Continue using the dedicated H-RNTI for the high speed downlink operation if the dedicated H-RNTI remains effective due to the procedure initiation cause.
  • Step 310 End.
  • the high speed downlink operation includes the HS-DSCH reception in the CELL_FACH state.
  • the UE provides the initiation cause for the network terminal during the cell/URA update procedure.
  • the procedure initiation cause of the cell update procedure could be cell reselection, periodical cell update, a radio link failure, an RLC unrecoverable error or uplink data transmission, whereas the procedure initiation cause of the URA update procedure could be URA reselection or periodical URA update.
  • the downlink packets include the UE identification information for the UE using the common H-RNTI but no UE identification information is included for the UE using the dedicated H-RNTI.
  • the procedure initiation cause is cell/URA reselection, causing the dedicated H-RNTI to become invalid
  • the UE clears the dedicated H-RNTI and then changes to use the common H-RNTI.
  • the UE preferably sets an HS_DSCH_RECEPTION_OF_CCCH variable to “TRUE” and starts reception of related physical (i.e. HS-SCCH and HS-PDSCH) and transport channels (i.e. HS-DSCH) according to configuration of an information element (IE) sent by the network terminal.
  • the IE can be a “Downlink HS-PDSCH system information for connected mode” or a “Downlink HS-PDSCH system information” IE.
  • the procedure initiation cause is periodical cell/URA update keeping effectiveness of the dedicated H-RNTI
  • the UE continues using the dedicated H-RNTI, which supports better data transmission efficiency than the common H-RNTI.
  • the UE of the prior art changes to use the common H-RNTI for the HS-DSCH reception in the CELL_FACH state during the cell/URA update procedure irrespective of the procedure initiation cause.
  • the UE changes to use the common H-RNTI only if the dedicated H-RNTI becomes invalid. If the dedicated H-RNTI stays effective during the cell/URA update procedure, the UE continues using the dedicated H-RNTI for less radio resource consumption and better data transmission efficiency.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmitters (AREA)
  • Communication Control (AREA)
US12/050,177 2007-03-23 2008-03-18 Method for Enhancing Data Transmission Efficiency for a Radio Resource Control Procedure for a Wireless Communications System and Related Apparatus Abandoned US20080232313A1 (en)

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US89650007P 2007-03-23 2007-03-23
US12/050,177 US20080232313A1 (en) 2007-03-23 2008-03-18 Method for Enhancing Data Transmission Efficiency for a Radio Resource Control Procedure for a Wireless Communications System and Related Apparatus

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US12/050,935 Active 2030-05-01 US8045518B2 (en) 2007-03-23 2008-03-18 Method of deactivating high-speed downlink operation in CELL—FACH state for a wireless communications system and related apparatus
US12/050,177 Abandoned US20080232313A1 (en) 2007-03-23 2008-03-18 Method for Enhancing Data Transmission Efficiency for a Radio Resource Control Procedure for a Wireless Communications System and Related Apparatus
US12/052,742 Abandoned US20080233939A1 (en) 2007-03-23 2008-03-21 Method for Enhancing Data Transmission Efficiency for a Radio Resource Control Procedure for a Wireless Communications System and Related Apparatus

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JP (3) JP4660672B2 (ko)
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CN (3) CN101272535B (ko)
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JP2008245281A (ja) 2008-10-09
KR100990461B1 (ko) 2010-10-29
KR101018446B1 (ko) 2011-03-02
EP1973363B1 (en) 2010-09-15
DE602008002457D1 (de) 2010-10-28
CN101272535B (zh) 2012-07-25
ATE481842T1 (de) 2010-10-15
JP2008245280A (ja) 2008-10-09
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US8045518B2 (en) 2011-10-25
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US20080233950A1 (en) 2008-09-25
CN101272535A (zh) 2008-09-24
KR100990761B1 (ko) 2010-10-29
EP1973363A2 (en) 2008-09-24
EP1973363A3 (en) 2009-12-02
KR20080086854A (ko) 2008-09-26
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CN101272619A (zh) 2008-09-24
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