WO2007024012A1 - Provision of downlink packet access services to user equipment in spread spectrum communication network - Google Patents

Provision of downlink packet access services to user equipment in spread spectrum communication network Download PDF

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Publication number
WO2007024012A1
WO2007024012A1 PCT/JP2006/317148 JP2006317148W WO2007024012A1 WO 2007024012 A1 WO2007024012 A1 WO 2007024012A1 JP 2006317148 W JP2006317148 W JP 2006317148W WO 2007024012 A1 WO2007024012 A1 WO 2007024012A1
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WO
WIPO (PCT)
Prior art keywords
mobile terminal
data transmission
packetized data
base station
transmission service
Prior art date
Application number
PCT/JP2006/317148
Other languages
French (fr)
Inventor
Phong Nguyen
Original Assignee
Nec Corporation
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
Priority claimed from AU2005904679A external-priority patent/AU2005904679A0/en
Application filed by Nec Corporation filed Critical Nec Corporation
Priority to CN200680031265.1A priority Critical patent/CN101253795B/en
Priority to US12/064,796 priority patent/US8335183B2/en
Priority to EP06797120.0A priority patent/EP1917829B1/en
Priority to JP2007555363A priority patent/JP5029368B2/en
Publication of WO2007024012A1 publication Critical patent/WO2007024012A1/en
Priority to US13/493,711 priority patent/US8711796B2/en
Priority to US13/551,802 priority patent/US8711798B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services

Definitions

  • the present invention relates generally to the provision of downlink packet access services to a mobile station in a spread spectrum communication network.
  • the invention is suitable for use in the provision of such services to a user equipment in a communication network conforming to the 3GPP-LTE standards being developed by the 3rd Generation Partnership Project (3GPP), and it will be convenient to describe the invention in relation to this exemplary, but non-limiting, application.
  • 3GPP 3rd Generation Partnership Project
  • Radio Access Network RAN
  • important parts of the long term evolution of Super 3G technology will include Radio Access Network (RAN) latency reduction, higher user data rates, improving system capability and coverage, and reducing cost to a network operator.
  • RAN Radio Access Network
  • the objective of this evolution is to develop a framework to enable high data rate, low-latency and packet-optimized radio-access.
  • WCDMA Wideband Code Division Multiple Access
  • the Super 3G system will be developed to support enhanced HSDPA and other types of packet-switched services.
  • reusing the existing HSDPA-related procedures that have been developed for the WCDMA system will lead to a situation where the future 3G system shall be coupled with and operationally dependent on existing WCDMA technology. This interdependence is likely to result in an even more complicated RAN architecture, which will then increase the cost of design, manufacture and operation of the Super 3G system.
  • a method of providing a packetized data transmission service to a mobile terminal in a spread spectrum communication network including at a base station, broadcasting an indication message to a cell on a downlink broadcast channel, the indication message providing notification of an available packetized data transmission service intended for the mobile terminal, at the mobile terminal, monitoring the broadcast channel for the indication message, and upon receipt, acknowledging detection of the indication message to the base station on an uplink contention channel, and at the base station, upon contention completion, transmitting packetized data transmission service configuration information to the mobile terminal on the broadcast channel.
  • the method may further include the steps of periodically placing the mobile terminal in an active state to monitor the broadcast channel for the indication message, and placing the mobile terminal in an inactive state, if no indication message is detected.
  • the method may further include the step of at the base station, transmitting control information for the packetized data transmission service to the mobile terminal on a downlink shared control channel.
  • the method may further include the step of at the base station, transmitting data for the packetized data transmission service to the mobile terminal on a downlink shared data channel.
  • the method may further include the step of at the mobile terminal, transmitting channel quality measurement and reporting information to the base station on an uplink shared scheduled channel.
  • the method may further include the steps of ceasing transmission from the base station of packetized data transmission control information to the mobile terminal, and upon failure to detect the packetized data transmission control information at the mobile terminal within a predetermined time, terminating the packetized data transmission service.
  • the method may further include the steps of at the base station, notifying the mobile terminal to terminate the packetized data transmission service by inclusion of a termination message in a packet header of an packetized data transmission control information packet, and upon detection of the termination message at the mobile terminal, terminating the packetized data transmission service.
  • the mobile terminal is comprised of a mobile phone.
  • a method of controlling an operation of a base station for providing a packetized data transmission service to a mobile terminal in a spread spectrum communication network including broadcasting an indication message to a cell on a downlink broadcast channel, the indication message providing notification of an available packetized data transmission service intended for the mobile terminal, the mobile terminal monitoring the broadcast channel for the indication message, and upon receipt, acknowledging detection of the indication message to the base station on an uplink contention channel, and upon contention completion, transmitting packetized data transmission service configuration information to the mobile terminal on the broadcast channel.
  • the method may further include the step of transmitting control information for the packetized data transmission service to the mobile terminal on a downlink shared control channel.
  • the method may further include the step of transmitting data for the packetized data transmission service to the mobile terminal on a downlink shared data channel.
  • the method may further include the steps of ceasing transmission of packetized data transmission control information to the mobile terminal, and upon failure to detect the packetized data transmission control information at the mobile terminal within a predetermined time, terminating the packetized data transmission service.
  • the method may further include the steps of notifying the mobile terminal to terminate the packetized data transmission service by inclusion of a termination message in a packet header of an packetized data transmission control information packet, and upon detection of the termination message at the mobile terminal, terminating the packetized data transmission service.
  • a system for providing a packetized data transmission service in a spread spectrum communication network including a base station and a mobile terminal, the base station being adapted to broadcast an indication message to a cell on a downlink broadcast channel, the indication message providing notification of an available packetized data transmission service intended for the mobile terminal, the mobile terminal being adapted to monitor the broadcast channel for the indication message, and upon receipt, acknowledging detection of the indication message to the base station on an uplink contention channel, and the base station being further adapted, upon contention completion, to transmit packetized data transmission service configuration information to the mobile terminal on the broadcast channel.
  • the mobile terminal may be comprised of a mobile phone.
  • a base station in a system for providing a packetized data transmission service in a spread spectrum communication network including the base station and a mobile terminal, the base station being adapted to broadcast an indication message to a cell on a downlink broadcast channel, the indication message providing notification of an available packetized data transmission service intended for the mobile terminal, the mobile terminal being adapted to monitor the broadcast channel for the indication message, and upon receipt, acknowledging detection of the indication message to the base station on an uplink contention channel, and the base station being further adapted, upon contention completion, to transmit packetized data transmission service configuration information to the mobile terminal on the broadcast channel.
  • HSDPA High Speed Downlink Packet Access
  • FIG. 1 is a schematic diagram illustrating a spread spectrum communication system in which an HSDPA service is provided from a base transceiver station to a user equipment.
  • FIG. 2 is a timing diagram illustrating the functional steps performed at both the base transceiver station and the user equipment during notification, acknowledgement, performance and termination of the HSDPA service.
  • a spread spectrum communication network 100 including a base transceiver station (BTS) 102 operably connected to a radio transmission tower 104, and a user equipment (UE) 108.
  • BTS base transceiver station
  • UE user equipment
  • the user equipment 108 is comprised of a mobile phone.
  • the base transceiver station (BTS) 102 and the radio tower 104 are operably connected to a communication network (Super 3G network) 106 conforming to the Super 3G system being developed by the 3GPP.
  • the base transceiver station 102 communicates with the user equipment 108 whilst the user equipment 108 is located within a broadcast cell 110.
  • Control information and data is exchanged between the base transceiver station 102 and the user equipment 108 during the provision of High Speed Downlink Packet Access (HSDPA) services by means of a channel structure 112 including a downlink (DL) broadcast channel 114, an uplink (UL) reserved channel (contention) 116, a downlink (DL) shared control channel 118, a downlink (DL) shared data channel 120, and an uplink scheduled channel (shared control channel and physical control channel) 122.
  • HSDPA High Speed Downlink Packet Access
  • the base transceiver station 102 includes a central processing unit (CPU), a first memory, a second memory, an input interface through which a command and/or data is input into the central processing unit, an output interface through which a result of steps having been executed by the central processing unit is output, and a bus through which the central processing unit is electrically connected with the first memory, the second memory, the input interface, and the output interface.
  • CPU central processing unit
  • first memory volatile and non-volatile memory
  • second memory volatile and non-volatile memory
  • an input interface through which a command and/or data is input into the central processing unit
  • an output interface through which a result of steps having been executed by the central processing unit is output
  • a bus through which the central processing unit is electrically connected with the first memory, the second memory, the input interface, and the output interface.
  • Each of the first and second memories is comprised of a semiconductor memory such as a read only memory (ROM), a random access memory (RAM) or an IC memory card, or a storage device such as a flexible disc, a hard disc or an optic magnetic disc.
  • a semiconductor memory such as a read only memory (ROM), a random access memory (RAM) or an IC memory card
  • a storage device such as a flexible disc, a hard disc or an optic magnetic disc.
  • the first memory comprises a read only memory (ROM), and the second memory comprises a random access memory (RAM).
  • ROM read only memory
  • RAM random access memory
  • the first memory stores therein a program for causing the central processing unit to carry out a method of controlling an operation of the base transceiver station 102 for providing a packetized data transmission service to the user equipment 108 in a spread spectrum communication network.
  • the second memory stores therein various data and parameters, and presents a working area to the central processing unit.
  • the central processing unit reads the program out of the first memory, and executes the program. Thus, the central processing unit operates in accordance with the program stored in the first memory.
  • both the base transceiver station 102 and the user equipment 108 act at step 200 to allow the user equipment 108 to register with the Super 3G network 106 and thereby enable the base transceiver station 102 to communicate directly with the user equipment 108.
  • the base transceiver station 102 transmits synchronization information to the user equipment 108 on a synchronization channel/common pilot channel in order for the user equipment 108 to detect relevant information sent to the user equipment 108 in data packets.
  • the user equipment 108 Upon receipt of the synchronization information at step 202, the user equipment 108 performs, at step 204, cell search, frame timing detection, symbol timing, and scrambling code detection functions in accordance with conventional WCDMA techniques to enable communication to be established between the
  • an indication message is prepared at step 206 to be broadcast to the entire cell 110, the indication message being encoded in such way that it can be decoded and identified by the user equipment 108 by a specific user equipment identification number that is allocated to the user equipment 108 by the Super 3G network 106 at step 200.
  • the indication message acts to notify the user equipment 108 of an available HSDPA services intended for the user equipment 108.
  • the encoded information is then broadcast at step 208 on the downlink broadcast channel 114 (set of sub-carriers), the user equipment 108 being informed of the downlink broadcast channel 114 upon registration with the Super 3G network 106 at step 200.
  • the user equipment 108 is normally in an inactive (sleep) state, except for predetermined periods of time when, in step 212, the user equipment 108 is placed in an active (wake-up) state in order to monitor the downlink broadcast channel 114 for indication messages transmitted from the base transceiver station 102.
  • the user equipment 108 If no indication message is detected, the user equipment 108 is once again placed in an inactive state. However, if an indication message is detected, the user equipment 108 processes the indication message, and transmits an acknowledgement 214 of detection of the indication message to the base transceiver station 102 on the uplink reserved channel 116 using a contention approach. The uplink reserved channel information on which the acknowledgement 214 is transmitted is indicated to the user equipment 108 in the indication message.
  • the base transceiver station 102 monitors the uplink reserved channel 116 at step 216 for the acknowledgement 214.
  • the base transceiver station 102 Upon receipt of the acknowledgement 214 from the user equipment 108, the base transceiver station 102 informs the user equipment 108 about the contention completion, and starts to prepare and transmit the RAN HSDPA service configuration information 218 on the downlink broadcast channel 114, at a time and frequency allocated for this task.
  • This downlink broadcast channel 114 is monitored only by the user equipment(s) 108 that previously sent an acknowledgement 214 to the indication message.
  • the user equipment 108 Upon successful completion of the contention, the user equipment 108 prepares to receive data on the downlink broadcast channel 114 at a predetermined time after completion of the contention, at step 220.
  • the configuration information received on this channel assists the user equipment 108 to perform layer 1 (physical layer), layer 2 (medium access control/radio link control), and layer 3 (Radio Resource Control layer) configuration to monitor the downlink shared control channel 118, configuring the Hybrid Automatic Repeat Request (HARQ) related functions and performing channel quality measurement and reporting.
  • HARQ Hybrid Automatic Repeat Request
  • channel quality information (CQI) 224 is transmitted from the user equipment 108 to the base transceiver station 102 according to a preconfigured schedule in order to provide the base transceiver station 102 with information as to which frequency chunk in the downlink shared data channel 120 is best suited for the particular user equipment 108 in order that frequency scheduling can be optimized.
  • CQI channel quality information
  • the channel quality information 224 is transmitted on the uplink scheduled channel 122.
  • the base transceiver station 102 performs channel scheduling and sends fast signaling information 228 on the downlink shared control channel 118 to the user equipment 108.
  • the associated packet data 230 is then sent on the downlink shared data channel 120 to the user equipment 108.
  • the user equipment 108 keeps monitoring the downlink shared control channel 118 on the allocated time-frequency slot.
  • the user equipment 108 detects control information intended for that user equipment 108, the user equipment 108 starts to receive and decode the associated packet data 230 transmitted on the downlink shared data channel 120.
  • the result of the data packet reception (ACK/NACK/POST/PRE/DTX for H-ARQ processing) 234 is then reported to the base transceiver station 102 on the associated uplink scheduled channel 122.
  • the channel quality information (CQI) 236 for the downlink packet scheduling is again transmitted on the uplink scheduled channel 122.
  • the base transceiver station 102 performs Adaptive Modulation and Coding (AMC), scheduling and retransmission for each user equipment 108. Retransmission occurs if a NACK message is received from the user equipment 108.
  • AMC Adaptive Modulation and Coding
  • the base transceiver station 102 may simply stop transmission of control information on the downlink shared control channel 118 to the user equipment 108, at step 240.
  • the HSDPA service is terminated and the user equipment 108 is again placed in an inactive state.
  • the HSDPA service can be terminated by inclusion of the termination message in a packet header of an HSDPA control information packet sent to the user equipment 108 on the downlink shared data channel 120. Upon detection of the termination message at the user equipment 108, the HSDPA service may be terminated.
  • the above- described method for providing an HSDPA service to a user equipment advantageously introduces a specific paging procedure and specific paging indication for an HSDPA service without requiring use of a dedicated data channel as currently described in WCDMA networks.
  • the above-described method introduces a sleep mode to allow the Super 3G user equipment to save power when in use.
  • a new channel is introduced to establish the Radio Resource Control (RRC) layer peer to peer communication for HSDPA RAN configuration, rather than relying upon a dedicated channel as in current WCDMA systems.
  • RRC Radio Resource Control
  • a packet transmission termination scheme is also introduced at the radio interface level to allow either the base transceiver station 102 to terminate a downlink packet transmission either temporarily or permanently whilst minimizing the exchange of traffic via the air interface between the base transceiver station 102 and the user equipment 108.

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

Abstract

A method of providing a packetized data transmission service to a mobile terminal (108) in a spread spectrum communication network (100), includes: at a transmitter (102), broadcasting an indication message to a cell on a downlink broadcast channel(114), the indication message providing notification of an available packetized data transmission service intended for the mobile terminal (108); at the mobile terminal (108), monitoring the broadcast channel (114) for the indication message, and upon receipt, acknowledging detection of the indication message to the transmitter (102) on an uplink contention channel (116); and at the transmitter (102), upon contention completion, transmitting packetized data transmission service configuration information to the mobile terminal (108) on the broadcast channel (114).

Description

DISCRIPTION
PROVISION OF DOWNLINK PACKET ACCESS SERVICES TO USER EQUIPMENT IN SPREAD SPECTRUM COMMUNICATION NETWORK
FIELD OF THE INVENTION
The present invention relates generally to the provision of downlink packet access services to a mobile station in a spread spectrum communication network. The invention is suitable for use in the provision of such services to a user equipment in a communication network conforming to the 3GPP-LTE standards being developed by the 3rd Generation Partnership Project (3GPP), and it will be convenient to describe the invention in relation to this exemplary, but non-limiting, application.
PRIORART
Recent enhancements in packet transmissions such as High Speed Downlink Packet Access (HSDPA) and enhanced uplink technology have made 3GPP radio-access technology highly competitive. In order to ensure that the competitiveness of this technology continues over a long time frame, a long term evolution of 3GPP radio-access technology is being developed. This new technology is known as Super 3G.
Important parts of the long term evolution of Super 3G technology will include Radio Access Network (RAN) latency reduction, higher user data rates, improving system capability and coverage, and reducing cost to a network operator. In order to achieve this, an evolution of the radio interface as well as the radio network architecture is being considered. The objective of this evolution is to develop a framework to enable high data rate, low-latency and packet-optimized radio-access.
Development of the Super 3G system has been focused on supporting services provided by the PS-domain, such as enhanced HSDPA, Multimedia Broadcast Multicast Services (MBMS), High Speed Uplink Packet Access (HSUPA) and other similar types of packet-switched services including Voice Over IP. Existing HSDPA services in Wideband Code Division Multiple Access
(WCDMA) systems are currently provided in a manner that is dependent on other dedicated RAN services. This results in an extremely complicated protocol stack design, and hinders the development of HSDPA services in WCDMA.
The Super 3G system will be developed to support enhanced HSDPA and other types of packet-switched services. However, reusing the existing HSDPA-related procedures that have been developed for the WCDMA system will lead to a situation where the future 3G system shall be coupled with and operationally dependent on existing WCDMA technology. This interdependence is likely to result in an even more complicated RAN architecture, which will then increase the cost of design, manufacture and operation of the Super 3G system.
There therefore exists a need to enable enhanced HSDPA services to be introduced into the future Super 3G system in such a manner as to be able to operate independently from the existing 3G -WCDMA system when considered from the RAN perspective. There also exists a need to provide enhanced HSDPA services in a manner that ameliorates or overcomes HSDPA service provision techniques.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention, there is provided a method of providing a packetized data transmission service to a mobile terminal in a spread spectrum communication network, the method including at a base station, broadcasting an indication message to a cell on a downlink broadcast channel, the indication message providing notification of an available packetized data transmission service intended for the mobile terminal, at the mobile terminal, monitoring the broadcast channel for the indication message, and upon receipt, acknowledging detection of the indication message to the base station on an uplink contention channel, and at the base station, upon contention completion, transmitting packetized data transmission service configuration information to the mobile terminal on the broadcast channel.
The method may further include the steps of periodically placing the mobile terminal in an active state to monitor the broadcast channel for the indication message, and placing the mobile terminal in an inactive state, if no indication message is detected. The method may further include the step of at the base station, transmitting control information for the packetized data transmission service to the mobile terminal on a downlink shared control channel.
The method may further include the step of at the base station, transmitting data for the packetized data transmission service to the mobile terminal on a downlink shared data channel.
The method may further include the step of at the mobile terminal, transmitting channel quality measurement and reporting information to the base station on an uplink shared scheduled channel.
The method may further include the steps of ceasing transmission from the base station of packetized data transmission control information to the mobile terminal, and upon failure to detect the packetized data transmission control information at the mobile terminal within a predetermined time, terminating the packetized data transmission service.
The method may further include the steps of at the base station, notifying the mobile terminal to terminate the packetized data transmission service by inclusion of a termination message in a packet header of an packetized data transmission control information packet, and upon detection of the termination message at the mobile terminal, terminating the packetized data transmission service. For instance, the mobile terminal is comprised of a mobile phone.
In another aspect of the present invention, there is provided a method of controlling an operation of a base station for providing a packetized data transmission service to a mobile terminal in a spread spectrum communication network, the method including broadcasting an indication message to a cell on a downlink broadcast channel, the indication message providing notification of an available packetized data transmission service intended for the mobile terminal, the mobile terminal monitoring the broadcast channel for the indication message, and upon receipt, acknowledging detection of the indication message to the base station on an uplink contention channel, and upon contention completion, transmitting packetized data transmission service configuration information to the mobile terminal on the broadcast channel.
The method may further include the step of transmitting control information for the packetized data transmission service to the mobile terminal on a downlink shared control channel.
The method may further include the step of transmitting data for the packetized data transmission service to the mobile terminal on a downlink shared data channel.
The method may further include the steps of ceasing transmission of packetized data transmission control information to the mobile terminal, and upon failure to detect the packetized data transmission control information at the mobile terminal within a predetermined time, terminating the packetized data transmission service.
The method may further include the steps of notifying the mobile terminal to terminate the packetized data transmission service by inclusion of a termination message in a packet header of an packetized data transmission control information packet, and upon detection of the termination message at the mobile terminal, terminating the packetized data transmission service.
In still another aspect of the present invention, there is provided a program for causing a computer equipped in a base station to carry out the above-mentioned method.
In yet another aspect of the present invention, there is provided a system for providing a packetized data transmission service in a spread spectrum communication network, the system including a base station and a mobile terminal, the base station being adapted to broadcast an indication message to a cell on a downlink broadcast channel, the indication message providing notification of an available packetized data transmission service intended for the mobile terminal, the mobile terminal being adapted to monitor the broadcast channel for the indication message, and upon receipt, acknowledging detection of the indication message to the base station on an uplink contention channel, and the base station being further adapted, upon contention completion, to transmit packetized data transmission service configuration information to the mobile terminal on the broadcast channel. In the above-mentioned system, the mobile terminal may be comprised of a mobile phone.
In still yet another aspect of the present invention, there is provided a base station in a system for providing a packetized data transmission service in a spread spectrum communication network, the system including the base station and a mobile terminal, the base station being adapted to broadcast an indication message to a cell on a downlink broadcast channel, the indication message providing notification of an available packetized data transmission service intended for the mobile terminal, the mobile terminal being adapted to monitor the broadcast channel for the indication message, and upon receipt, acknowledging detection of the indication message to the base station on an uplink contention channel, and the base station being further adapted, upon contention completion, to transmit packetized data transmission service configuration information to the mobile terminal on the broadcast channel.
The present invention will now be described in reference to the attached drawings in which a method and system of providing a High Speed Downlink Packet Access (HSDPA) service is illustrated as a preferred embodiment. It is to be appreciated that the invention is not to be construed as being limited to the particular embodiment illustrated in the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram illustrating a spread spectrum communication system in which an HSDPA service is provided from a base transceiver station to a user equipment. FIG. 2 is a timing diagram illustrating the functional steps performed at both the base transceiver station and the user equipment during notification, acknowledgement, performance and termination of the HSDPA service.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments in accordance with the present invention will be explained hereinbelow with reference to drawings.
Referring now to Figure 1, there is shown generally a spread spectrum communication network 100 including a base transceiver station (BTS) 102 operably connected to a radio transmission tower 104, and a user equipment (UE) 108.
For instance, the user equipment 108 is comprised of a mobile phone. The base transceiver station (BTS) 102 and the radio tower 104 are operably connected to a communication network (Super 3G network) 106 conforming to the Super 3G system being developed by the 3GPP. The base transceiver station 102 communicates with the user equipment 108 whilst the user equipment 108 is located within a broadcast cell 110. Control information and data is exchanged between the base transceiver station 102 and the user equipment 108 during the provision of High Speed Downlink Packet Access (HSDPA) services by means of a channel structure 112 including a downlink (DL) broadcast channel 114, an uplink (UL) reserved channel (contention) 116, a downlink (DL) shared control channel 118, a downlink (DL) shared data channel 120, and an uplink scheduled channel (shared control channel and physical control channel) 122. For instance, the base transceiver station 102 includes a central processing unit (CPU), a first memory, a second memory, an input interface through which a command and/or data is input into the central processing unit, an output interface through which a result of steps having been executed by the central processing unit is output, and a bus through which the central processing unit is electrically connected with the first memory, the second memory, the input interface, and the output interface.
Each of the first and second memories and is comprised of a semiconductor memory such as a read only memory (ROM), a random access memory (RAM) or an IC memory card, or a storage device such as a flexible disc, a hard disc or an optic magnetic disc.
For instance, the first memory comprises a read only memory (ROM), and the second memory comprises a random access memory (RAM).
The first memory stores therein a program for causing the central processing unit to carry out a method of controlling an operation of the base transceiver station 102 for providing a packetized data transmission service to the user equipment 108 in a spread spectrum communication network. The second memory stores therein various data and parameters, and presents a working area to the central processing unit. The central processing unit reads the program out of the first memory, and executes the program. Thus, the central processing unit operates in accordance with the program stored in the first memory.
Referring now to Figure 2, when the user equipment 108 moves within the broadcast cell 110, both the base transceiver station 102 and the user equipment 108 act at step 200 to allow the user equipment 108 to register with the Super 3G network 106 and thereby enable the base transceiver station 102 to communicate directly with the user equipment 108.
At step 202, the base transceiver station 102 transmits synchronization information to the user equipment 108 on a synchronization channel/common pilot channel in order for the user equipment 108 to detect relevant information sent to the user equipment 108 in data packets.
Upon receipt of the synchronization information at step 202, the user equipment 108 performs, at step 204, cell search, frame timing detection, symbol timing, and scrambling code detection functions in accordance with conventional WCDMA techniques to enable communication to be established between the
Super 3G network 106 and the user equipment 108.
When an HSDPA service is to be provided to the user equipment 108, an indication message is prepared at step 206 to be broadcast to the entire cell 110, the indication message being encoded in such way that it can be decoded and identified by the user equipment 108 by a specific user equipment identification number that is allocated to the user equipment 108 by the Super 3G network 106 at step 200. The indication message acts to notify the user equipment 108 of an available HSDPA services intended for the user equipment 108.
The encoded information is then broadcast at step 208 on the downlink broadcast channel 114 (set of sub-carriers), the user equipment 108 being informed of the downlink broadcast channel 114 upon registration with the Super 3G network 106 at step 200.
At step 210, the user equipment 108 is normally in an inactive (sleep) state, except for predetermined periods of time when, in step 212, the user equipment 108 is placed in an active (wake-up) state in order to monitor the downlink broadcast channel 114 for indication messages transmitted from the base transceiver station 102.
If no indication message is detected, the user equipment 108 is once again placed in an inactive state. However, if an indication message is detected, the user equipment 108 processes the indication message, and transmits an acknowledgement 214 of detection of the indication message to the base transceiver station 102 on the uplink reserved channel 116 using a contention approach. The uplink reserved channel information on which the acknowledgement 214 is transmitted is indicated to the user equipment 108 in the indication message.
The base transceiver station 102 monitors the uplink reserved channel 116 at step 216 for the acknowledgement 214.
Upon receipt of the acknowledgement 214 from the user equipment 108, the base transceiver station 102 informs the user equipment 108 about the contention completion, and starts to prepare and transmit the RAN HSDPA service configuration information 218 on the downlink broadcast channel 114, at a time and frequency allocated for this task. This downlink broadcast channel 114 is monitored only by the user equipment(s) 108 that previously sent an acknowledgement 214 to the indication message.
Upon successful completion of the contention, the user equipment 108 prepares to receive data on the downlink broadcast channel 114 at a predetermined time after completion of the contention, at step 220. The configuration information received on this channel assists the user equipment 108 to perform layer 1 (physical layer), layer 2 (medium access control/radio link control), and layer 3 (Radio Resource Control layer) configuration to monitor the downlink shared control channel 118, configuring the Hybrid Automatic Repeat Request (HARQ) related functions and performing channel quality measurement and reporting. Once the configuration has taken place at step 220, the user equipment
108 starts performing, at step 222, channel quality measurement, and monitoring of the downlink shared control channel 118 to detect fast signaling intended for the user equipment 108 and other existing HSDPA related procedures for receiving data on the downlink shared data channel 120. Accordingly, channel quality information (CQI) 224 is transmitted from the user equipment 108 to the base transceiver station 102 according to a preconfigured schedule in order to provide the base transceiver station 102 with information as to which frequency chunk in the downlink shared data channel 120 is best suited for the particular user equipment 108 in order that frequency scheduling can be optimized.
The channel quality information 224 is transmitted on the uplink scheduled channel 122. Once the base transceiver station 102 has received initial channel quality information 224, the base transceiver station 102, at step 226, performs channel scheduling and sends fast signaling information 228 on the downlink shared control channel 118 to the user equipment 108.
The associated packet data 230 is then sent on the downlink shared data channel 120 to the user equipment 108. At step 232, the user equipment 108 keeps monitoring the downlink shared control channel 118 on the allocated time-frequency slot.
Once the user equipment 108 detects control information intended for that user equipment 108, the user equipment 108 starts to receive and decode the associated packet data 230 transmitted on the downlink shared data channel 120. The result of the data packet reception (ACK/NACK/POST/PRE/DTX for H-ARQ processing) 234 is then reported to the base transceiver station 102 on the associated uplink scheduled channel 122.
Similarly, the channel quality information (CQI) 236 for the downlink packet scheduling is again transmitted on the uplink scheduled channel 122. At step 238, once the H-ARQ feedback information and channel quality information has been received, the base transceiver station 102 performs Adaptive Modulation and Coding (AMC), scheduling and retransmission for each user equipment 108. Retransmission occurs if a NACK message is received from the user equipment 108. The above-mentioned steps 228 to 238 are then repeated at both the base transceiver station 102 and the user equipment 108 during provision of the HSDPA service to the user equipment 108.
Once the HSDPA service provided to the user equipment 108 is to be terminated, the base transceiver station 102 may simply stop transmission of control information on the downlink shared control channel 118 to the user equipment 108, at step 240.
In this case, upon failure of the user equipment 108 at step 242 to detect HSDPA control information within a predetermined time, the HSDPA service is terminated and the user equipment 108 is again placed in an inactive state.
Alternatively, the HSDPA service can be terminated by inclusion of the termination message in a packet header of an HSDPA control information packet sent to the user equipment 108 on the downlink shared data channel 120. Upon detection of the termination message at the user equipment 108, the HSDPA service may be terminated.
From the foregoing, it will be appreciated that the above- described method for providing an HSDPA service to a user equipment advantageously introduces a specific paging procedure and specific paging indication for an HSDPA service without requiring use of a dedicated data channel as currently described in WCDMA networks.
Moreover, the above-described method introduces a sleep mode to allow the Super 3G user equipment to save power when in use. A new channel is introduced to establish the Radio Resource Control (RRC) layer peer to peer communication for HSDPA RAN configuration, rather than relying upon a dedicated channel as in current WCDMA systems.
A packet transmission termination scheme is also introduced at the radio interface level to allow either the base transceiver station 102 to terminate a downlink packet transmission either temporarily or permanently whilst minimizing the exchange of traffic via the air interface between the base transceiver station 102 and the user equipment 108.
Finally, it is to be appreciated that various modifications and additions may be made to the above-described method of providing a high speed downlink packet access service to a user equipment in the spread spectrum communication network without departing from the spirit or ambit of the invention.

Claims

1. A method of providing a packetized data transmission service to a mobile terminal in a spread spectrum communication network, the method including: at a base station, broadcasting an indication message to a cell on a downlink broadcast channel, the indication message providing notification of an available packetized data transmission service intended for the mobile terminal; at the mobile terminal, monitoring the broadcast channel for the indication message, and upon receipt, acknowledging detection of the indication message to the base station on an uplink contention channel; and at the base station, upon contention completion, transmitting packetized data transmission service configuration information to the mobile terminal on the broadcast channel.
2. The method as set forth in claim 1, further including the steps of: periodically placing the mobile terminal in an active state to monitor the broadcast channel for the indication message; and placing the mobile terminal in an inactive state, if no indication message is detected.
3. The method as set forth in claim 1 or 2, further including the step of: at the base station, transmitting control information for the packetized data transmission service to the mobile terminal on a downlink shared control channel.
4. The method as set forth in any one of the preceding claims, further including the step of: at the base station, transmitting data for the packetized data transmission service to the mobile terminal on a downlink shared data channel.
5. The method as set forth in any one of the preceding claims, further including the step of: at the mobile terminal, transmitting channel quality measurement and reporting information to the base station on an uplink shared scheduled channel.
6. The method as set forth in any one of the preceding claims, further including the steps of: ceasing transmission from the base station of packetized data transmission control information to the mobile terminal; and upon failure to detect the packetized data transmission control information at the mobile terminal within a predetermined time, terminating the packetized data transmission service.
7. The method as set forth in any one of claims 1 to 5, further including the steps of: at the base station, notifying the mobile terminal to terminate the packetized data transmission service by inclusion of a termination message in a packet header of an packetized data transmission control information packet; and upon detection of the termination message at the mobile terminal, terminating the packetized data transmission service.
8. The method as set forth in any one of the preceding claims, wherein the mobile terminal is comprised of a mobile phone.
9. A method of controlling an operation of a base station for providing a packetized data transmission service to a mobile terminal in a spread spectrum communication network, the method including: broadcasting an indication message to a cell on a downlink broadcast channel, the indication message providing notification of an available packetized data transmission service intended for the mobile terminal, the mobile terminal monitoring the broadcast channel for the indication message, and upon receipt, acknowledging detection of the indication message to the base station on an uplink contention channel; and upon contention completion, transmitting packetized data transmission service configuration information to the mobile terminal on the broadcast channel.
10. The method as set forth in claim 9, further including the step of: transmitting control information for the packetized data transmission service to the mobile terminal on a downlink shared control channel.
11. The method as set forth in claim 9 or 10, further including the step of: transmitting data for the packetized data transmission service to the mobile terminal on a downlink shared data channel.
12. The method as set forth in claim 9, 10 or 11, further including the steps of: ceasing transmission of packetized data transmission control information to the mobile terminal; and upon failure to detect the packetized data transmission control information at the mobile terminal within a predetermined time, terminating the packetized data transmission service.
13. The method as set forth in any one of claims 9 to 12, further including the steps of: notifying the mobile terminal to terminate the packetized data transmission service by inclusion of a termination message in a packet header of an packetized data transmission control information packet; and upon detection of the termination message at the mobile terminal, terminating the packetized data transmission service.
14. A program for causing a computer equipped in a base station to carry out a method defined in any one of claims 9 to 13.
15. A system for providing a packetized data transmission service in a spread spectrum communication network, the system including a base station and a mobile terminal, the base station being adapted to broadcast an indication message to a cell on a downlink broadcast channel, the indication message providing notification of an available packetized data transmission service intended for the mobile terminal; the mobile terminal being adapted to monitor the broadcast channel for the indication message, and upon receipt, acknowledging detection of the indication message to the base station on an uplink contention channel; and the base station being further adapted, upon contention completion, to transmit packetized data transmission service configuration information to the mobile terminal on the broadcast channel.
16. The system as set forth in claim 15, wherein said mobile terminal is comprised of a mobile phone.
17. A base station in a system for providing a packetized data transmission service in a spread spectrum communication network, the system including the base station and a mobile terminal, the base station being adapted to broadcast an indication message to a cell on a downlink broadcast channel, the indication message providing notification of an available packetized data transmission service intended for the mobile terminal; the mobile terminal being adapted to monitor the broadcast channel for the indication message, and upon receipt, acknowledging detection of the indication message to the base station on an uplink contention channel; and the base station being further adapted, upon contention completion, to transmit packetized data transmission service configuration information to the mobile terminal on the broadcast channel.
PCT/JP2006/317148 2005-08-26 2006-08-24 Provision of downlink packet access services to user equipment in spread spectrum communication network WO2007024012A1 (en)

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CN200680031265.1A CN101253795B (en) 2005-08-26 2006-08-24 Provision of downlink packet access services to user equipment in spread spectrum communication network
US12/064,796 US8335183B2 (en) 2005-08-26 2006-08-24 Provision of downlink packet access services to user equipment in spread spectrum communication network
EP06797120.0A EP1917829B1 (en) 2005-08-26 2006-08-24 Hsdpa service in spread spectrum communication network
JP2007555363A JP5029368B2 (en) 2005-08-26 2006-08-24 Provision of downlink packet access services to user equipment in spread spectrum communication networks
US13/493,711 US8711796B2 (en) 2005-08-26 2012-06-11 Provision of downlink packet access services to user equipment in spread spectrum communication network
US13/551,802 US8711798B2 (en) 2005-08-26 2012-07-18 Provision of downlink packet access services to user equipment in spread spectrum communication network

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AU2005904679 2005-08-26

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US13/493,711 Division US8711796B2 (en) 2005-08-26 2012-06-11 Provision of downlink packet access services to user equipment in spread spectrum communication network
US13/551,802 Continuation US8711798B2 (en) 2005-08-26 2012-07-18 Provision of downlink packet access services to user equipment in spread spectrum communication network

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EP1917829A1 (en) 2008-05-07
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US8335183B2 (en) 2012-12-18
JP5348269B2 (en) 2013-11-20
US20120314669A1 (en) 2012-12-13
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US8711798B2 (en) 2014-04-29
US8711796B2 (en) 2014-04-29
CN102917459A (en) 2013-02-06
CN102711255A (en) 2012-10-03
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JP2009506581A (en) 2009-02-12
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US20120314731A1 (en) 2012-12-13
EP2544497B1 (en) 2014-11-26
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CN102917459B (en) 2016-03-09

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