New! View global litigation for patent families

US20070115875A1 - Data transmission method and mobile telephone system - Google Patents

Data transmission method and mobile telephone system Download PDF

Info

Publication number
US20070115875A1
US20070115875A1 US11582303 US58230306A US2007115875A1 US 20070115875 A1 US20070115875 A1 US 20070115875A1 US 11582303 US11582303 US 11582303 US 58230306 A US58230306 A US 58230306A US 2007115875 A1 US2007115875 A1 US 2007115875A1
Authority
US
Grant status
Application
Patent type
Prior art keywords
channel
spreading
code
control
radio
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.)
Abandoned
Application number
US11582303
Inventor
Antti Toskala
Zhi-Chun Honkasalo
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.)
Nokia Networks Oy
Qualcomm Inc
Original Assignee
Nokia Oy 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
Family has litigation

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J13/00Code division multiplex systems
    • H04J13/16Code allocation
    • H04J13/18Allocation of orthogonal codes
    • H04J13/20Allocation of orthogonal codes having an orthogonal variable spreading factor [OVSF]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J13/00Code division multiplex systems
    • H04J13/0007Code type
    • H04J13/004Orthogonal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J13/00Code division multiplex systems
    • H04J13/0007Code type
    • H04J13/004Orthogonal
    • H04J13/0044OVSF [orthogonal variable spreading factor]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W28/00Network traffic or resource management
    • H04W28/16Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18Negotiating wireless communication parameters
    • H04W28/22Negotiating communication rate
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B2201/00Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70701Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B2201/00Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70703Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation using multiple or variable rates
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATIONS NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices

Abstract

A method for transmitting data from a radio network subsystem to user equipment in a mobile telephone system, a radio network subsystem and user equipment. In the method, the radio network subsystem transmits a dedicated control channel to the user equipment and a dedicated traffic channel of variable data transmission rate to the user equipment. During transmission, the radio network subsystem spreads each channel with a spreading code, and the spreading code used to spread the traffic channel is changed according to the required data transmission rate. According to the invention, each control channel frame indicates the spreading code with which the corresponding traffic channel is spread when transmitted.

Description

  • [0001]
    This is a continuation of U.S. patent application Ser. No. 11/152,084, filed on Jun. 15, 2006 (Issue Fee Paid), which is a continuation of U.S. patent application Ser. No. 09/486,821, filed on Mar. 2, 2002 (U.S. Pat. No. 6,975,615), which is the U.S. National Stage of International Patent Application No. [[:]] PCT/FI99/00581, filed Jun. 30, 1999, which, in turn, relies for priority upon Finnish Application No. 981546, filed Jul. 3, 1998, the contents of all of which are incorporated herein by reference in their entireties.
  • FIELD OF THE INVENTION
  • [0002]
    The invention relates to a method for transmitting data from a radio network subsystem to user equipment in a mobile telephone system. The invention relates in particular to changing the data transmission rate of a traffic channel, especially a packet traffic channel during a radio link in a universal mobile telephone system.
  • BACKGROUND OF THE INVENTION
  • [0003]
    One of the biggest problems in mobile telephone systems is an efficient use of a limited radio capacity. In present systems, a certain amount of capacity is reserved for each user for a circuit-switched call during the entire radio link. When using packet-switched transmission, in which the data to be transmitted is typically generated in bursts, it is a waste of radio capacity to keep the radio capacity reserved all the time according to the greatest momentary data transmission need.
  • [0004]
    In systems using the code division multiple access (CDMA) method, in a downlink from a radio network subsystem to user equipment, different users use the same code tree in which the spreading codes used in the system are arranged mutually orthogonally. If a spreading code having a small spreading factor allowing a high transmission rate is reserved for one user, the code in question can reserve a large part of the capacity of the radio network subsystem in question, or its base transceiver station. In a code tree used by one base transceiver station, one sector of the base transceiver station can use sixteen mutually orthogonal sixteen character-long spreading codes, for instance, in which case the entire capacity of the base transceiver station can at one moment be in use and a new user will not have access to any data transmission resources for a downlink.
  • [0005]
    On an uplink, this problem does not exist, since each user has access to the entire code tree of the base transceiver station. Various users are distinguished from each other with a scrambling code which is specific for each transmitter. For instance, a universal mobile telecommunication system (UMTS) using a direct-sequence wideband code division multiple access method (DS W-CDMA) can have 512 different scrambling codes and 256 different spreading codes on a downlink. On an uplink, the number of scrambling codes can be much higher, even millions of different codes. It is interesting to note that a base transceiver station normally uses only one scrambling code for each transmitter.
  • [0006]
    In present mobile telephone systems, the data transmission rates used for both speech and data have been relatively low, and it has been possible to keep the resource problem under control. In new mobile telephone systems, the data transmission rates used will be considerably higher than in the present systems due to the wireless remote, use of various computer applications. The computer applications include various database applications, e-mail, WWW browser, etc.
  • [0007]
    For instance, the CDMA2000 system discloses a solution in which fundamental channels and supplementary channels are used. The fundamental channel transmits the signalling of the MAC (Medium Access Control) sub-layer of the data link layer, which indicates whether a supplementary channel with a higher transmission rate is used in addition to the fundamental channel. A problem with this solution is that it does not support fast changing of the channel transmission rate by changing the spreading code, since MAC sublayer signalling is used to change the spreading code and it is a relatively slow process.
  • BRIEF DESCRIPTION OF THE INVENTION
  • [0008]
    It is thus an object of the invention to develop a method and an apparatus implementing the method so as to solve the above problems. This is achieved by the method described in the following. The method in question is a method for transmitting data from a radio network subsystem to user equipment in a mobile telephone system, comprising: the radio network subsystem transmits a dedicated control channel to the user equipment; the radio network subsystem transmits a dedicated traffic channel of variable data transmission rate to the user equipment; during transmission, the radio network subsystem spreads each channel with a spreading code; the spreading code used to spread the traffic channel is changed according to the required data transmission rate. In the method in question, each frame of the control channel indicates the spreading code with which the corresponding traffic channel frame is spread when transmitted.
  • [0009]
    The invention also relates to a radio network subsystem which is adapted to: transmit a dedicated control channel to the user equipment; transmit a dedicated traffic channel of variable data transmission rate to the user equipment; spread each channel with a spreading code during transmission; change the spreading code used to spread the traffic channel according to the required data transmission rate. The radio network subsystem is adapted to indicate in each control channel frame the spreading code with which the corresponding traffic channel frame is spread when transmitted.
  • [0010]
    The invention further relates to user equipment which is adapted to: receive a dedicated control channel transmitted by the radio network subsystem; receive a dedicated traffic channel of variable data transmission rate transmitted by the radio network subsystem; remove the spreading of each channel with a spreading code. The user equipment is adapted to read from each control channel frame the spreading code with which the corresponding traffic channel frame is spread.
  • [0011]
    Preferred embodiments of the invention are disclosed in the dependent claims.
  • [0012]
    The invention is based on indicating in each control channel frame the spreading code with which the corresponding traffic channel is spread.
  • [0013]
    The method and system of the invention provide several advantages. The data transmission rate can quickly be changed, even by each frame, by selecting a suitable spreading code. This enables an efficient utilization of radio resources.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0014]
    In the following, the invention will be described in greater detail in connection with preferred embodiments with reference to the attached drawings in which:
  • [0015]
    FIGS. 1A and 1B show a mobile telephone system,
  • [0016]
    FIG. 2A shows a transmitter and receiver of the mobile telephone system;
  • [0017]
    FIG. 2B shows spreading and modulation performed in the transmitter,
  • [0018]
    FIG. 3 shows channels of the mobile telephone system in a frame,
  • [0019]
    FIG. 4A shows a code tree,
  • [0020]
    FIG. 4B shows a subcode tree,
  • [0021]
    FIG. 5 shows user equipment,
  • [0022]
    FIG. 6 shows a flow chart of the operations of the invention.
  • DETAILED DESCRIPTION OF THE INVENTION
  • [0023]
    The invention can be used in various mobile telephone systems that use the code division multiple access method (CDMA). The examples illustrate the use of the invention in a universal mobile telephone system using a direct-sequence wideband code division multiple access method, without limiting the invention to it, however. The examples are based on the specification of the WCDMA system, further information on which is available in the ETSI (European Telecommunications Standards Institute) specification “The ETSI UMTS Terrestrial Radio Access (UTRA) ITU-R RTT Candidate Submission (Tdoc SMG2 260/98, May/June 1998), which is incorporated herein by reference.
  • [0024]
    The structure of a universal mobile telephone system is described with reference to FIGS. 1A and 1B. FIG. 1B includes only the blocks that are essential for describing the invention, but it is obvious to those skilled in the art that a common mobile telephone system also contains other functions and structures which need not be described in detail herein. The main parts of a mobile telephone system are a core network CN, a universal mobile telephone system (UMTS) terrestrial radio access network UTRAN, and user equipment UE. The interface between CN and UTRAN is referred to as Iu and the air interface between UTRAN and UE is referred to as Uu.
  • [0025]
    UTRAN comprises radio network subsystems RNS. The interface between RNSs is referred to as Iur. An RNS comprises a radio network controller RNC and one or more nodes B. The interface between RNC and B is referred to as Iub. The service area of node B, i.e. cell, is indicated with C in FIG. 1B.
  • [0026]
    As the presentation in FIG. 1A is very abstract, it is therefore clarified in FIG. 1 B by setting forth the parts of the GSM system that approximately correspond to the parts of the UMTS. It should be noted that the mapping shown is by no means a binding one but an approximation, since the responsibilities and functions of the different parts of the UMTS are still being planned.
  • [0027]
    FIG. 1B shows a packet transfer through the Internet 102 from a computer 100 connected to a mobile telephone system to a portable computer 122 connected to user equipment UE. The user equipment UE can, for instance, be a fixed terminal, a terminal arranged in a vehicle, or a portable terminal. The infrastructure of a radio network UTRAN comprises radio network subsystems RNS, i.e. base transceiver station systems. A radio network subsystem RNS comprises a radio network controller RNC, i.e. base station controller, and at least one node B, i.e. base transceiver station, under its control.
  • [0028]
    The base transceiver station B has a multiplexer 114, transceivers 116 and a control unit 118 which controls the operation of the transceivers 116 and the multiplexer 114. With the multiplexer 114, the traffic and control channels used by several transceivers 116 are placed in the transmission link Iub.
  • [0029]
    The transceiver 116 of the base transceiver station B are connected to an antenna unit 120 with which a bidirectional radio link Uu is implemented to user equipment UE. The structure of the frames to be transmitted over the bidirectional radio link Uu is clearly specified.
  • [0030]
    The radio network controller RNC comprises a group switching field 110 and control unit 112. The group switching field 110 is used for speech and data connection and to connect signalling circuits. The base station system formed by the base transceiver station B and the radio network controller RNC also comprises a transcoder 108. Work distribution between the radio network controller RNC and the base transceiver station B as well as their physical structure can vary depending on implementation. Typically, the base transceiver station B takes care of the radio path implementaton as described above. The radio network controller RNC typically takes care of the following: management of radio resources, control of handover between cells, power adjustment, timing and synchronization, paging the user equipment.
  • [0031]
    The transcoder 108 is usually located as dose as possible to a mobile switching centre 106, because speech can then be transmitted in mobile telephone system format between the transcoder 108 and the radio network controller RNC saving transmission capacity. The transcoder 108 converts the different digital coding formats of speech used between the public switched telephone network and the mobile telephone network to be compatible with each other, for instance from the 64 kbits format of a public network to another (e.g. 13 kbit/s) format of a cellular network and vice versa. The hardware required is not described in detail herein, but it can be noted that other data than speech is not converted in transcoder 122. The control unit 112 takes care of call control, mobility management, collection of statistics, and signalling.
  • [0032]
    Core network CN comprises an infrastructure belonging to a mobile telephone system and external to UTRAN. FIG. 1B describes two of the components in a core network CN, i.e. a mobile switching centre 106 and a gateway mobile switching centre 104 which handles the connections of the mobile telephone system to the outside world, in this case, to the Internet 102.
  • [0033]
    FIG. 5 shows an example of the structure of user equipment UE. The essential parts of the user equipment UE are: an interface 504 to the antenna 502 of the user equipment, a transceiver 506, a control part 510 of the user equipment, and an interface 512 to a battery 514. The user interface usually comprises a display 500, a keyboard 508, a microphone 516, and a loudspeaker 518.
  • [0034]
    FIG. 2A describes the operation of a radio transmitter—radio receiver pair. FIG. 2A describes a case of downlink where the radio transmitter is located in node B and the radio receiver in the user equipment UE.
  • [0035]
    The upper part of FIG. 2A describes the essential functions of the radio transmitter. Various services located in the physical channel include speech, data, moving or still video picture, and control channels of the system which are processed in the control part 214 of the radio transmitter. The figure shows the processing of the control channel and data. Different services require different source coding means, for instance speech requires a speech codec. For clarity's sake, source coding means are not, however, described in FIG. 2A.
  • [0036]
    Different channel coding is then performed for different channels in blocks 202A and 202B. Channel coding includes, for instance, different block codes, an example of which is cyclic redundancy check (CRC). In addition, convolution coding and its various modifications, such as punctured convolution coding or turbo coding, are typically used.
  • [0037]
    When the different channels have been channel-coded, they are interleaved in an interleaver 204A, 204B. The purpose of interleaving is to facilitate error correction. In interleaving, the bits of different services are mixed in a certain manner together, in which case a momentary fade in the radio path does not necessarily make the transmitted information unidentifiable. The interleaved bits are then spread with a spreading code, scrambled with a scrambling code and modulated in block 206A, 206B, the operation of which is described in greater detail in FIG. 2B. Individual signals are combined in block 208 to be transmitted through one transmitter.
  • [0038]
    Finally, the combined signal is forwarded to radio frequency parts 210 which can comprise different power amplifiers and filters restricting bandwidth. The analogous radio signal is then transmitted through an antenna 212 to the radio path Uu.
  • [0039]
    The lower part of FIG. 2A describes the essential functions of the radio receiver. The radio receiver is typically a RAKE receiver. An analogous radio frequency signal is received from the radio path Uu with an antenna 234. The signal is forwarded to radio frequency parts 232 comprising a filter which prevents all frequencies outside the desired bandwidth. After this, the signal is converted in a demodulator 230 to an intermediate frequency or directly to a base band, and the thus converted signal is then sampled and quantized.
  • [0040]
    As the signal in question is a multi-path propagated signal, the aim is to combine the signal components that propagated via different paths in block 228 which comprises several RAKE fingers of prior art. The signal components received at different time delays by the RAKE fingers are searched for by correlating the received signal with the spreading codes used and delayed by predefined time delays. When the time delays of the signal components have been found, the signal components belonging to the same signal are combined. At the same time, the spreading of the signal components is removed by multiplying the signal by the spreading code of the physical channel. The interleaving of the received physical channel is then removed in deinterleaving means 226.
  • [0041]
    The deinterleaved physical channel is then distributed to the data streams of various channels in a demultiplexer 224. The channels are directed each to its own channel decoding block 222A, 222B where the channel coding, for instance block coding or convolution coding, used in transmission is decoded. Convolution coding is preferably decoded with a Viterbi decoder. Each transmitted channel 220A, 220B can then be forwarded to a required further processing, for instance data 220 is forwarded to a computer 122 connected to the user equipment UE. The control channels of the system are forwarded to the control part 236 of the radio receiver.
  • [0042]
    FIG. 2B describes in greater detail the spreading of a channel with a spreading code and its modulation. In the figure, the bit stream of the channel arrives from the left to block S/P in which each two-bit sequence is converted from serial mode to parallel mode, i.e. one bit is forwarded to the I branch of the signal and the second bit to the Q branch. Then the I and Q branches of the signal are multiplied by the same spreading code C.sub.ch, in which case the relatively narrow-band information is spread on a wide frequency band. Each link Uu has its own spreading code by which the receiver identifies transmissions meant for it. The signal is then scrambled by multiplying it by a scrambling code C.sub.scramb which is different for each transmitter. The pulse format of the obtained signal is filtered with a filter p(t). Finally, the signal is modulated to a radio frequency carrier by multiplying its different branches offset by 90 degrees from each other, the thus obtained branches are combined into one carrier which is ready to be transmitted to the radio path Uu apart from possible filtering and power amplifications. The described modulation method is QPSK (Quadrature Phase Shift Keying).
  • [0043]
    FIG. 4A describes different spreading codes. Each point 400 represents one possible spreading code. The vertical dashed lines illustrate different spreading factors SF=1, SF=2, SF=4, SF=8, SF=16, SF=32, SF=64, SF=128, SF=256. The codes on each vertical dashed line are mutually orthogonal. It is thus possible to simultaneously use at most two hundred and fifty six different mutually orthogonal spreading codes. For instance in UMTS, when using a 4.096-megachip carrier, a spreading factor of SF=256 corresponds to a transmission rate of thirty two kilobits per second, and correspondingly the highest practical transmission rate is achieved with spreading factor SF=4, with which the data transmission rate is two thousand forty eight kilobits per second. The transmission rate in the channel varies thus step by step, 32, 64, 128, 256, 512, 1024, and 2048 kbit/s, while the spreading factor changes correspondingly, 256, 128, 64, 32, 16, 8, and 4. The data transmission rate available to the user depends on the channel coding used. For instance, when using ⅓ convolution coding, the data transmission rate of the user is approximately one third of the data transmission rate of the channel. The spreading factor indicates the length of the spreading code. For instance, the spreading code corresponding to spreading factor SF=1 is (1). Spreading factor SF=2 has two mutually orthogonal spreading codes (1,1) and (1,−1). Further, spreading code SF=4 has four mutually orthogonal spreading codes: under the higher-level spreading code (1,1), there are spreading codes (1,1,1,1) and (1,1,−1,−1), and under the second higher-level spreading code (1,−1), there are spreading codes (1,−1,1,−1) and (1,−1,−1,1). The formation of spreading codes is thus continued towards the lower levels of the code tree. The spreading codes of a certain level are always mutually orthogonal. Similarly, a spreading code of a certain level is orthogonal with all lower-level spreading codes derived from another spreading code on the same level.
  • [0044]
    With reference to FIG. 3, an example will be described as to what kind of frame structure can be used in a physical channel. Frames 340A, 340B, 340C, 340D are numbered sequentially from one to seventy two and they form a 720-millisecond long super frame. The length of one frame 340C is 10 milliseconds. Frame 340C is divided into sixteen slots 330A, 330B, 330C, 330D. The length of one slot 330C is 0.625 milliseconds. One slot 330C typically corresponds to one power adjustment period during which power is adjusted one decibel up or down, for instance.
  • [0045]
    Physical channels are divided into two different types: dedicated physical data channels (DPDCH) 310 and dedicated physical control channels (DPCCH) 312. Dedicated physical data channels 310 are used to transmit data 306 which is generated on the second layer and above of OSI (Open Systems Interconnection), i.e. the dedicated control channels and dedicated traffic channels. Dedicated physical control channels 312 transmit control information generated on the first layer of OSI. Control information comprises: pilot bits 300 used in channel estimation, transmit power control commands (TPC) 302, and optionally a transport format indicator (TFI) 304. The transport format indicator 304 indicates to the receiver the transmission rate used for each dedicated physical data channel of the uplink at a given time.
  • [0046]
    As shown in FIG. 3, the dedicated physical data channels 310 and the dedicated physical control channels 312 on the downlink are time-multiplexed to the same slot 330C. However, on the uplink, the channels in question are transmitted parallel so that they are IQ/code-multiplexed (I=in-phase, Q=quadrature) to each frame 340C and transmitted using dual-channel QPSK modulation (dual-channel quadrature phase-shift keying modulation). When additional dedicated physical data channels 310 need to be transmitted, they are code-multiplexed to the I or Q branch of the first channel pair.
  • [0047]
    The method of the invention for transmitting data from a radio network subsystem RNS to user equipment UE can be illustrated by the flow chart in FIG. 6. The execution of the method for a single radio frame is started from block 600.
  • [0048]
    Next, in block 602, the spreading code used in spreading the traffic channel is changed according to the required data transmission rate. The spreading code selected for the traffic channel is marked X.
  • [0049]
    Next, in block 604, each control channel frame indicates the spreading code with which the corresponding traffic channel frame is spread when transmitted. In other words, the identification data of the spreading code X are entered in the control channel frame.
  • [0050]
    In block 606, the radio network subsystem RNS transmits a dedicated control channel frame to the user equipment UE. During transmission, the operation in block 608, for instance, is performed, in which the radio network subsystem RNS spreads each channel with a spreading code. The spreading code selected here for the control channel is marked Y.
  • [0051]
    In block 610, the radio network subsystem RNS transmits a dedicated traffic channel of variable data transmission rate to the user equipment UE. The variable data transmission rate is achieved by changing the spreading code; as described in connection with FIG. 4A, each spreading factor has a different data transmission rate. During transmission, the operation in block 612, for instance, is performed, in which the radio network subsystem RNS spreads each channel with a spreading code, i.e. the traffic channel is spread with the selected spreading code X.
  • [0052]
    Thus, in the invention, the transmitter transmits the traffic channel frame spread with the spreading code X. The transmitter transmits the control channel frame associated with the traffic channel in question spread with the spreading code Y. The control channel frame indicates that the corresponding traffic channel frame has been spread with the spreading code X. This way, the receiver can remove the spreading of the traffic channel frame in question. Thus, the receiver need not know in advance what the data transmission capacity/spreading code of the traffic channel frame in question is.
  • [0053]
    The association of the control channel frame and the traffic channel frame with each other must be indicated in some way. The easiest way to do this is to combine the association with timing, for instance so that the frames are transmitted at approximately the same time. The control channel frames and traffic channel frames associated with each other are preferably transmitted on the same frequency, spread with different spreading codes, and substantially simultaneously, i.e. separated by one frame length at most.
  • [0054]
    In a preferred embodiment of the invention, the identification data of the spreading code X used to spread the traffic channel is entered into the transport format indicator in the control channel frame. This provides the advantage that new fields need not be defined for this function.
  • [0055]
    A part of the code tree shown in FIG. 4A must be reserved for the use of the control channels. The spreading factor can also be increased to 1024, for instance, by extending the code tree to lower levels, whereby an adequate data transmission rate of eight kilobits per seconds could be achieved.
  • [0056]
    FIG. 4B shows one preferred embodiment in which the code tree is divided into sub-code trees, and one branch in a level is a tree access point to the sub-code tree in question, and the branches below the tree access point belong to the sub-code tree in question. In FIG. 4B, one of the eight spreading codes of the spreading factor SF=8 has been chosen as the tree access point TAP of the sub-code tree. The size of the sub-code tree has also been restricted so that the spreading codes of the spreading factor SF=256 are not meant to be Used, since their data transmission rate 32 kbit/s is relatively low. Data transmission rates of 64 kbit/s, 128 kbit/s, 256 kbit/s, 512 kbit/s, and 1024 kbit/s can thus be achieved with the selected sub-code tree. The presented sub-code tree is only one example of several possible sub-code trees, the specification of sub-code trees in the system depends on the properties required in the system, such as traffic volume. The data transmission rate of the traffic channel is changed by changing the length of its spreading code, i.e. by moving between the levels of the sub-code tree.
  • [0057]
    In one preferred embodiment, each spreading code of a sub-code tree is numbered in an agreed manner, and the number in question is entered into the transport format indicator. In the example of FIG. 4B, the spreading codes are numbered from 1 to 32. The numbers 1 to 31 each identify one spreading code and the number 32 indicates that no spreading code is used in the frame in question, i.e. the capacity of the frame in question can be freely utilized by another link with certain restrictions.
  • [0058]
    The restrictions are due to the fact that the spreading codes used at each instant must be mutually orthogonal. A spreading code can be used only if no other code on the path to the tree access point TAP of the sub-tree is being used and none of the spreading codes on the paths on the levels below the spreading code in question are being used. For instance, if the spreading code 4 is being used, the spreading codes 8, 9, 16, 17, 18, and 19 on the levels below it cannot be used. Instead, the spreading codes 5, 6, 7, and all spreading codes on levels below them, i.e. 10 to 15 and 20 to 31, can be used. If spreading code 1 is being used, none of the spreading codes 2 to 31 of the subcode tree can be used.
  • [0059]
    The numbering of the spreading codes in a sub-code tree can also be implemented in such a way that one number corresponds to two or more parallel spreading codes. This way, using multi-code reception in the receiver, the use of too small spreading ratios can be avoided, for instance in unfavorable propagation conditions of radio waves or due to the restrictions of the receiver in the user equipment. When higher transmission rates are needed, the numbering of the subcode tree can be begun from the lower spreading code levels.
  • [0060]
    A typical situation could be that the system has several users of a 64 kbit/s link, which means that the spreading codes 16 to 27, for instance, are being used. In such a case, the spreading codes 1 to 6 and 8 to 13 can, of course, not be used. Instead, the spreading codes 7, 14, 15, and 28 to 31 are available for use. The system can thus, in addition to the above users, have one user, for instance, who uses the spreading code 7 and, with it, the transmission rate 256 kbits.
  • [0061]
    According to the rules described above, it is thus possible to select from the same sub-code tree a spreading code for one or more units of user equipment. The radio network subsystem allocates the spreading codes. When the sub-code tree becomes congested, the user equipment can be transferred to another sub-code tree. The described method is good as regards data security, too, because it does not matter, if a receiver, to which a frame does not belong, were to detect the frame by accident, since the protection used on the higher levels, for instance ciphering in a GSM system, makes sure that the data within the frame cannot be read. Alternatively, the matter can be taken care of by scrambling, as is done in the first layer of the CDMA2000 system.
  • [0062]
    Processing channels in the radio interface Uu is performed with a protocol architecture comprising a physical layer, data link layer and network layer of the ISO (International Standardisation Organisation) OSI (Open Systems Interconnection) model. The protocol stacks are located both in the radio network subsystem RNS and in the user equipment UE. The data link layer is divided into two sub-layers: the MAC (Medium Access Control) sublayer and the LAC (Link Access Control) sub-layer. Typically, the services provided by the physical layer for the higher layers determine the transmission channel and its properties, such as the spreading code used. The MAC sub-layer's task is to control access to the physical layer; the selection of the transport format indicator, for instance, is performed in this sub-layer. The signalling of the physical layer, data link layer and network layer is transmitted in the control channel.
  • [0063]
    The user equipment does not send an acknowledgement to the radio network subsystem after receiving the transport format indicator, but this signalling is performed as signalling of the physical layer without acknowledgement. In poor radio conditions, this may result in that the user equipment cannot read the spreading code with which the corresponding traffic channel frame was transmitted. In such a case, the protocols of the higher layers manage the re-transmission of the packet using the ARQ (Automatic Repeat Request) method.
  • [0064]
    The radio network subsystem signals the tree access point of the sub-code tree to the user equipment, and the user equipment sends an acknowledgement to the radio network subsystem. This signalling is preferably performed between the MAC sub-layers, because the tree access point of the sub-code tree is not changed very often, and it is necessary to make sure that, in case of failure in signalling, a relatively difficult re-signalling need not be performed.
  • [0065]
    In one preferred embodiment, the radio network subsystem transmits the traffic channel frames in a synchronized manner to the units of user equipment which belong to the same sub-code tree. This provides the advantage that the allocation of the sub-code tree between various links is easier, since the reservations of different codes are freed and the reservations of new codes are made always at certain instants, generally at one-frame intervals.
  • [0066]
    In the invention, the required data transmission rate of the control channel is preferably as low as possible, because the required signalling does not require a lot of data transmission capacity; one possible data transmission rate is eight kilobits per second.
  • [0067]
    In one preferred embodiment, the control channel contains pilot bits for channel estimation. This way, pilot bits are not necessarily needed in the traffic channel, i.e. the traffic channel contains only useful load of the user. Channel estimation can be done by means of the control channel pilot bits only, because the signal passes through the same channel, only the spreading code is different.
  • [0068]
    In one preferred embodiment, the radio network subsystem transmits the control channel frames of different user equipment as non-simultaneously as possible. This procedure facilitates channel estimation, because the pilot bits overlap as little as possible during different connections.
  • [0069]
    In one preferred embodiment, other than control data, for instance data or speech, is transmitted in the free capacity of the control channel frame. The data can even be circuit-switched link packets, because the control channel capacity is reserved during the entire link, during which the data transmission rate of the control channel is fixed.
  • [0070]
    The same spreading code is typically always used in spreading the control channel. Only during handover may the control channel spreading code need to be changed. The control channel spreading code in question is selected as described above either from the part of the code tree reserved for the use of the control channels or from a code space outside the code tree. However, the spreading codes must be mutually orthogonal, which is why, for clarity's sake, all system codes are usually formed by means of a code tree.
  • [0071]
    The invention is preferably implemented by means of software. The processing required in the radio network subsystem necessitates changes to the protocol processing software and to the control of transmitter operation. Correspondingly, in the user equipment, it is necessary to make changes to the protocol processing software and to the control of receiver operation.
  • [0072]
    Even though the invention has been explained in the above with reference to examples in accordance with the accompanying drawings, it is obvious that the invention is not restricted to them but can be modified in many ways within the scope of the inventive idea disclosed in the attached claims.

Claims (40)

  1. 1. A base station comprising a radio transmitter that includes a control unit, and a transceiver, said base station for
    transmitting a control channel to a user equipment;
    transmitting a traffic channel of variable data transmission rate to the user equipment;
    spreading each channel with a spreading code during transmission;
    changing the spreading code used to spread the traffic channel according to a required data transmission rate;
    indicating in each control channel frame the spreading code with which a corresponding traffic channel frame is spread when transmitted, and
    transmitting the control channel and traffic channel frames associated with each other on the same frequency, spread with different spreading codes, and separated by one frame length at most.
  2. 2. The base station of claim 1, wherein said control unit is configured to control said transceiver.
  3. 3. The base station of claim 1, wherein the control channel frame comprises a transport format indicator into which the base station is configured to enter the identification data of the spreading code used to spread the traffic channel.
  4. 4. The base station of claim 1, wherein the spreading codes are arranged into a code tree in such a manner that on the first level, the code tree root comprises a one-bit spreading code, the second level comprises two branches with mutually orthogonal two-bit spreading codes, the third level comprises four branches with mutually orthogonal four-bit spreading codes, the fourth level comprises eight branches with mutually orthogonal eight-bit spreading codes, the fifth level comprises sixteen branches with mutually orthogonal sixteen-bit spreading codes, the sixth level comprises thirty two branches with mutually orthogonal thirty-two-bit spreading codes, the seventh level comprises sixty four branches with mutually orthogonal sixty-four-bit spreading codes, the eight level comprises one hundred and twenty eight branches with mutually orthogonal 128-bit spreading codes, the ninth level comprises two hundred and fifty six branches with mutually orthogonal 256-bit spreading codes.
  5. 5. The base station of claim 4, wherein the base station is configured to divide the code tree into sub-code trees, and one branch in a level is a tree access point to a sub-code tree, and the branches below the tree access point belong to the sub-code tree in question.
  6. 6. The base station of claim 5, wherein the base station is configured to change the data transmission rate of the traffic channel by changing the length of its spreading code by moving between the levels of the sub-code tree.
  7. 7. The base station of claim 6, wherein the base station is configured to number each spreading code of a sub-code tree in an agreed manner and to enter the number in question into a transport format indicator.
  8. 8. The base station of claim 6, wherein the base station does not expect an acknowledgement from the user equipment after transmitting a transport format indicator to the user equipment.
  9. 9. The base station of claim 1, wherein the base station is configured to transmit signalling of the physical layer, data link layer and network layer in the control channel.
  10. 10. The base station of claim 5, wherein the base station is configured to signal the tree access point of the sub-code tree to the user equipment and to await an acknowledgement to its signalling from the user equipment.
  11. 11. The base station of claim 10, wherein the base station is configured to perform the signalling of the tree access point of the sub-code tree as signalling of the MAC sub-layer in the data link layer.
  12. 12. The base station of claim 1, wherein the base station is configured to transmit the traffic channel frames in a synchronized manner to the units of user equipment which belong to the same sub-code tree.
  13. 13. The base station of claim 1, wherein the base station is configured to set the data transmission rate of the control channel as low as possible.
  14. 14. The base station of claim 1, wherein the base station is configured to place pilot bits into the traffic channel for channel estimation.
  15. 15. The base station of claim 1, wherein the base station is configured to place only useful load in the traffic channel.
  16. 16. The base station of claim 1, wherein the base station is configured to transmit the control channel frames of different user equipment as non-simultaneously as possible.
  17. 17. The base station of claim 1, wherein the base station is configured to place data or speech in free capacity of the control channel frame.
  18. 18. The base station of claim 1, wherein the base station is configured to transmit the control channel at a fixed data transmission rate.
  19. 19. The base station of claim 1, wherein the base station is a part of a universal mobile telecommunication system using a direct-sequence wideband code division multiple access method.
  20. 20. A software product having computer executable instructions, said computer executable instructions being stored on a computer readable medium, said instructions being executable by a network element to perform a method for transmitting data from the network element to a user equipment, the method comprising:
    transmitting a control channel to the user equipment;
    transmitting a traffic channel of variable data transmission rate to the user equipment;
    spreading each channel with a spreading code during transmission;
    changing the spreading code used to spread the traffic channel according to a required data transmission rate;
    indicating in each control channel frame the spreading code with which a corresponding traffic channel frame is spread when transmitted, and
    transmitting the control channel and traffic channel frames associated with each other on the same frequency, spread with different spreading codes, and separated by one frame length at most.
  21. 21. The software product of claim 20, wherein said network element is a base station.
  22. 22. A radio network controller comprising a control unit, said radio network controller, in conjunction with a transmission of a control channel and a traffic channel of variable data transmission rate to user equipment, for
    allocating a spreading code for each channel during transmission;
    changing the spreading code used to spread the traffic channel according to a required data transmission rate, and
    indicating in each control channel frame the spreading code with which a corresponding traffic channel frame is spread when transmitted,
    wherein the control channel and traffic channel frames associated with each other are transmitted on the same frequency, spread with different spreading codes, and separated by one frame length at most.
  23. 23. The radio network controller of claim 22, wherein the spreading codes are arranged into a code tree in such a manner that on the first level, the code tree root comprises a one-bit spreading code, the second level comprises two branches with mutually orthogonal two-bit spreading codes, the third level comprises four branches with mutually orthogonal four-bit spreading codes, the fourth level comprises eight branches with mutually orthogonal eight-bit spreading codes, the fifth level comprises sixteen branches with mutually orthogonal sixteen-bit spreading codes, the sixth level comprises thirty two branches with mutually orthogonal thirty-two-bit spreading codes, the seventh level comprises sixty four branches with mutually orthogonal sixty-four-bit spreading codes, the eight level comprises one hundred and twenty eight branches with mutually orthogonal 128-bit spreading codes, the ninth level comprises two hundred and fifty six branches with mutually orthogonal 256-bit spreading codes.
  24. 24. The radio network controller of claim 23, wherein the radio network controller is configured to reserve a part of the spreading codes in the code tree for the use of the control channels.
  25. 25. The radio network controller of claim 23, wherein the radio network controller is configured to divide the code tree into sub-code trees, and one branch in a level is a tree access point to a sub-code tree, and the branches below the tree access point belong to the sub-code tree in question.
  26. 26. The radio network controller of claim 25, wherein the radio network controller is configured to change the data transmission rate of the traffic channel by changing the length of its spreading code by moving between the levels of the sub-code tree.
  27. 27. The radio network controller of claim 26, wherein the radio network controller is configured to number each spreading code of a sub-code tree in an agreed manner and to enter the number in question into a transport format indicator.
  28. 28. The radio network controller of claim 7, wherein the number refers to at least two parallel spreading codes.
  29. 29. The radio network controller of claim 25, wherein the radio network controller is configured to use the various spreading codes of the same sub-code tree for at least two different units of user equipment.
  30. 30. The radio network controller of claim 29, wherein the radio network subsystem is configured to allocate the spreading codes.
  31. 31. The radio network controller of claim 30, wherein when the sub-code tree becomes congested, the radio network controller is configured to transfer the user equipment to another sub-code tree.
  32. 32. The radio network controller of claim 22, wherein the radio network controller is configured to always use the same spreading code in spreading the control channel.
  33. 33. A software product having computer executable instructions, said computer executable instructions being stored on a computer readable medium, said instructions being executable by a network controller to perform a method for transmitting data from a network element to a user equipment, said network element being configured to transmit a control channel to the user equipment, and to transmit a traffic channel of variable data transmission rate to the user equipment, the method comprising:
    allocating a spreading code for each channel during transmission;
    changing the spreading code used to spread the traffic channel according to a required data transmission rate, and
    indicating in each control channel frame the spreading code with which a corresponding traffic channel frame is spread when transmitted,
    wherein the control channel and traffic channel frames associated with each other are transmitted on the same frequency, spread with different spreading codes, and separated by one frame length at most.
  34. 34. A software product having computer executable instructions, said computer executable instructions being stored on a computer readable medium, said instructions being executable by a user equipment to perform a method for receiving data from a network element, said method comprising:
    receiving a control channel transmitted by a radio network subsystem;
    receiving a traffic channel of variable data transmission rate transmitted by the network element, wherein a spreading code used by the network element to spread the traffic channel during transmission is changed according to a required data transmission rate;
    removing the spreading of each channel with the spreading code;
    reading from each control channel frame the spreading code with which a corresponding traffic channel frame is spread, and
    receiving the control channel frames and traffic channel frames associated with each other transmitted by the network element on the same frequency, spread with different spreading codes, and separated by one frame length at most.
  35. 35. A communication system comprising a network element and a user equipment,
    (a) said network element for:
    (i) transmitting a control channel to the user equipment;
    (ii) transmitting a traffic channel of variable data transmission rate to the user equipment;
    (iii) spreading each channel with a spreading code during transmission;
    (iv) changing the spreading code used to spread the traffic channel according to a required data transmission rate;
    (v) indicating in each control channel frame the spreading code with which a corresponding traffic channel frame is spread when transmitted, and
    (vi) transmitting the control channel and traffic channel frames associated with each other on the same frequency, spread with different spreading codes, and separated by one frame length at most; and
    (b) said user equipment for
    (i) receiving the control channel transmitted by the network element;
    (ii)-receiving the traffic channel of variable data transmission rate transmitted by the network element, wherein a spreading code used by the network element to spread the traffic channel during transmission is changed according to a required data transmission rate;
    (iii)-removing the spreading of each channel with the spreading code;
    (iv) reading from each control channel frame the spreading code with which a corresponding traffic channel frame is spread, and
    (v) receiving the control channel frames and traffic channel frames associated with each other transmitted by the network element on the same frequency, spread with different spreading codes, and separated by one frame length at most.
  36. 36. The communication system of claim 35, wherein said network element is a base station.
  37. 37. A processor for use in a base station of a communication system, said processor being configured to execute computer executable instructions for transmitting data from a radio network subsystem to a user equipment according to a method comprising:
    transmitting a physical control channel to the user equipment;
    transmitting a physical traffic channel of variable data transmission rate to the user equipment;
    spreading each channel with a spreading code during transmission;
    changing the spreading code used to spread the traffic channel according to a required data transmission rate;
    indicating in each control channel frame the spreading code with which a corresponding traffic channel frame is spread when transmitted, and
    transmitting the control channel and traffic channel frames associated with each other on the same frequency, spread with different spreading codes, and separated by one frame length at most.
  38. 38. An apparatus for use in a network element of a communications system comprising a transmitter and a control unit, said apparatus for:
    transmitting a control channel to user equipment;
    transmitting a traffic channel of variable data transmission rate to the user equipment;
    spreading each channel with a spreading code during transmission;
    changing the spreading code used to spread the traffic channel according to a required data transmission rate;
    indicating in each control channel frame the spreading code with which a corresponding traffic channel frame is spread when transmitted, and
    transmitting the control channel and traffic channel frames associated with each other on the same frequency, spread with different spreading codes, and separated by one frame length at most.
  39. 39. An apparatus for use in a user equipment of a communications system comprising a receiver and a control unit, said apparatus for:
    receiving a control channel transmitted by a radio network subsystem; and
    receiving a traffic channel of variable data transmission rate transmitted by the radio network subsystem, wherein a spreading code used by the radio network subsystem to spread the traffic channel during transmission is changed according to a required data transmission rate;
    removing the spreading of each channel with a spreading code, wherein the apparatus-reads from each control channel frame the spreading code with which a corresponding traffic channel frame is spread, and
    wherein the apparatus receives the control channel frames and traffic channel frames associated with each other transmitted by the radio network subsystem on the same frequency, spread with different spreading codes, and separated by one frame length at most.
  40. 40. User equipment comprising:
    a receiver for
    receiving a control channel transmitted by a radio network subsystem; and
    receiving a traffic channel of variable data transmission rate transmitted by the radio network subsystem, wherein a spreading code used by the radio network subsystem to spread the traffic channel during transmission is changed according to a required data transmission rate; and
    a control part for
    removing the spreading of each channel with a spreading code, wherein the user equipment is configured to read from each control channel frame the spreading code with which a corresponding traffic channel frame is spread, and
    wherein the user equipment receives the control channel frames and traffic channel frames associated with each other transmitted by the radio network subsystem on the same frequency, spread with different spreading codes, and separated by one frame length at most.
US11582303 1998-07-03 2006-10-18 Data transmission method and mobile telephone system Abandoned US20070115875A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
FI981546A FI981546A (en) 1998-07-03 1998-07-03 A data transmission method and a mobile phone system
FI981546 1998-07-03
PCT/FI1999/000581 WO2000002326A3 (en) 1998-07-03 1999-06-30 Data transmission method and mobile telephone system
US09486821 US6975615B1 (en) 1998-07-03 1999-06-30 Data transmission method and mobile telephone system
US11152084 US7139260B2 (en) 1998-07-03 2005-06-15 Data transmission method and mobile telephone system
US11582303 US20070115875A1 (en) 1998-07-03 2006-10-18 Data transmission method and mobile telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11582303 US20070115875A1 (en) 1998-07-03 2006-10-18 Data transmission method and mobile telephone system

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US11152084 Continuation US7139260B2 (en) 1998-07-03 2005-06-15 Data transmission method and mobile telephone system

Publications (1)

Publication Number Publication Date
US20070115875A1 true true US20070115875A1 (en) 2007-05-24

Family

ID=8552140

Family Applications (3)

Application Number Title Priority Date Filing Date
US09486821 Active US6975615B1 (en) 1998-07-03 1999-06-30 Data transmission method and mobile telephone system
US11152084 Active US7139260B2 (en) 1998-07-03 2005-06-15 Data transmission method and mobile telephone system
US11582303 Abandoned US20070115875A1 (en) 1998-07-03 2006-10-18 Data transmission method and mobile telephone system

Family Applications Before (2)

Application Number Title Priority Date Filing Date
US09486821 Active US6975615B1 (en) 1998-07-03 1999-06-30 Data transmission method and mobile telephone system
US11152084 Active US7139260B2 (en) 1998-07-03 2005-06-15 Data transmission method and mobile telephone system

Country Status (8)

Country Link
US (3) US6975615B1 (en)
EP (1) EP1012995B3 (en)
JP (2) JP2002520900A (en)
CN (1) CN1131599C (en)
DE (2) DE69917875D1 (en)
ES (1) ES2222035T7 (en)
FI (1) FI981546A (en)
WO (1) WO2000002326A3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050169349A1 (en) * 1999-08-17 2005-08-04 Samsung Electronics Co., Ltd. Method for communicating scrambling code ID in mobile communication system
US8831554B2 (en) * 2008-02-06 2014-09-09 At&T Mobility Ii Llc Management of a multi-application mobile carrier tree

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6539050B1 (en) * 1997-06-26 2003-03-25 Hughes Electronics Corporation Method for transmitting wideband signals via a communication system adapted for narrow-band signal transmission
EP2242192A3 (en) * 1999-07-06 2011-11-02 Samsung Electronics Co., Ltd. Apparatus and method for encoding/decoding transport format combination indicator in CDMA mobile communication system
DE60006930D1 (en) * 2000-02-08 2004-01-15 Alcatel Sa A method for setting a transmission quality target value for transmission power control in a mobile radio transmission system
EP1128592A3 (en) 2000-02-23 2003-09-17 NTT DoCoMo, Inc. Multi-carrier CDMA and channel estimation
DE60038198T2 (en) * 2000-05-17 2009-03-26 Matsushita Electric Industrial Co., Ltd., Kadoma-shi Hybrid ARQ system with data and control channel for data packet transfer
GB0015669D0 (en) * 2000-06-28 2000-08-16 Motorola Inc Radio communication system, transmitter and receiver
DE10034248A1 (en) * 2000-07-14 2002-01-31 Siemens Ag Method for rapidly allocating radio resources to logical channels in the downlink direction
FR2817094B1 (en) * 2000-11-17 2003-02-07 Cit Alcatel Method for the issuance of power control in a mobile radio system
GB2398975B (en) * 2001-02-01 2005-02-23 Fujitsu Ltd Communications systems
FR2821515B1 (en) * 2001-02-23 2003-05-23 Cit Alcatel Treatment Resource Management Method in a mobile radio system
EP1438795B1 (en) * 2001-09-29 2012-02-08 LG Electronics, Inc. Method for transferring and /or receiving data in communication system and apparatus thereof
US7321576B2 (en) 2001-11-15 2008-01-22 Nokia Corporation Method for compact representation of multi-code signaling in communication systems
RU2298876C2 (en) 2001-11-15 2007-05-10 Нокиа Корпорейшн Method for compact submission of signals warning about milticodes in communication systems
US20050039101A1 (en) * 2001-11-28 2005-02-17 Johan Torsner Method and system of retransmission
EP1471658B1 (en) * 2002-01-29 2006-05-31 Mitsubishi Denki Kabushiki Kaisha Transmission of Additional Dedicated Physical Control CHannel (ADPCCH) in W-CDMA system
US7197007B2 (en) * 2002-05-11 2007-03-27 Accton Technology Corporation Method for generating 2D OVSF codes in multicarrier DS-CDMA systems
US7346038B2 (en) * 2002-05-11 2008-03-18 Accton Technology Corporation Method for generating 2D OVSF codes in multicarrier DS-CDMA systems
GB2392066B (en) 2002-08-16 2005-11-09 Toshiba Res Europ Ltd Equaliser apparatus and methods
CN1567777B (en) 2003-07-10 2012-05-30 华为技术有限公司 Signal demodulating equipment of CDMA communication system
US7181538B2 (en) * 2003-11-14 2007-02-20 Sybase 365, Inc. System and method for providing configurable, dynamic multimedia message service pre-transcoding
US7751429B2 (en) * 2004-02-13 2010-07-06 Broadcom Corporation Signaling format for WLANS
JP4000325B2 (en) * 2004-10-29 2007-10-31 日本電波工業株式会社 Spread spectrum communication system and its constituent devices
CN101512933A (en) * 2005-11-30 2009-08-19 费穆托接入有限公司 Novel distributed base station architecture
EP2070341A4 (en) * 2006-09-29 2017-03-15 Nokia Technologies Oy Apparatus, method and computer program providing usage of e dch as rach shared channel
WO2008053321A3 (en) 2006-10-30 2008-09-04 Nokia Corp Providing transmission parameters for a high speed random access channel
US7797187B2 (en) * 2006-11-13 2010-09-14 Farecast, Inc. System and method of protecting prices
WO2008090528A1 (en) * 2007-01-25 2008-07-31 Nokia Corporation Collision detection for random access procedure
WO2009053941A9 (en) * 2007-10-25 2009-07-30 Nokia Corp Method for fast transmission type selection in wcdma umts
CN101630356B (en) 2008-07-16 2012-07-04 中兴通讯股份有限公司 Method and device for allocating antenna of radio frequency identification system

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5333013A (en) * 1991-02-07 1994-07-26 Canon Kabushiki Kaisha Image encoding apparatus
US5673260A (en) * 1994-02-09 1997-09-30 Ntt Mobile Communications Network Inc. Method and system for CDMA mobile communication
US5883899A (en) * 1995-05-01 1999-03-16 Telefonaktiebolaget Lm Ericsson Code-rate increased compressed mode DS-CDMA systems and methods
US6009091A (en) * 1998-03-13 1999-12-28 Motorola, Inc. Method and apparatus for mobile station location within a communication system
US6041034A (en) * 1996-12-20 2000-03-21 Fujitsu Limited Spread spectrum communication system
US6084884A (en) * 1996-06-19 2000-07-04 Ntt Mobile Communications Network, Inc. CDMA communication method and group spreading modulator
US6108369A (en) * 1997-07-11 2000-08-22 Telefonaktiebolaget Lm Ericsson Channelization code allocation for radio communication systems
US6130884A (en) * 1996-12-05 2000-10-10 Nec Corporation Variable rate CDMA spread circuit
US6222875B1 (en) * 1997-07-11 2001-04-24 Telefonaktiebolaget Lm Ericsson (Publ) Low-delay rate detection for variable rate communication systems
US6317413B1 (en) * 1998-05-18 2001-11-13 Nokia Mobile Phones Ltd. Method and apparatus for assigning variable length walsh codes in a spread spectrum system
US6381229B1 (en) * 1998-05-15 2002-04-30 Telefonaktielbolaget L M Ericsson (Publ) Random access in a mobile telecommunications system
US6477158B2 (en) * 1998-03-16 2002-11-05 Mitsubishi Denki Kabushiki Kaisha Method and apparatus for assigning codes
US6542484B1 (en) * 1998-05-15 2003-04-01 Telefonaktiebolaget Lm Ericsson (Publ) Code allocation for radiocommunication systems
US6570889B1 (en) * 1998-05-15 2003-05-27 Sony International (Europe) Gmbh Transmitter and transmitting method increasing the flexibility of code assignment
US6631125B1 (en) * 1999-10-20 2003-10-07 Nokia Corporation Channel set-up in wideband, code division multiple access systems
US6920552B2 (en) * 2001-03-16 2005-07-19 Broadcom Corporation Network interface with double data rate and delay locked loop

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI925472A (en) 1992-12-01 1994-06-02 Nokia Mobile Phones Ltd A data transmission method and system
JPH06350523A (en) 1993-06-14 1994-12-22 Fujitsu Ltd Mobile telephone system
US5726978A (en) 1995-06-22 1998-03-10 Telefonaktiebolaget L M Ericsson Publ. Adaptive channel allocation in a frequency division multiplexed system
FI955113A (en) 1995-10-26 1997-04-27 Nokia Mobile Phones Ltd Data transmission method, transmitter and receiver
US5920552A (en) 1996-05-30 1999-07-06 Lucent Technologies, Inc. Variable rate coding for wireless applications
JPH10145282A (en) 1996-11-12 1998-05-29 N T T Ido Tsushinmo Kk Ds-cdma transmission system
JPH10150386A (en) 1996-11-15 1998-06-02 Canon Inc Radio communication system
US6125280A (en) 1998-03-19 2000-09-26 Lucent Technologies Inc. Automatic neighbor identification in a cellular system
DE69927198D1 (en) * 1998-03-19 2005-10-20 Hitachi Ltd Broadcast information delivering system
DE69904107D1 (en) 1998-04-30 2003-01-09 Roke Manor Research Power control and transmission rate method for a mobile radio transmission system

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5333013A (en) * 1991-02-07 1994-07-26 Canon Kabushiki Kaisha Image encoding apparatus
US5673260A (en) * 1994-02-09 1997-09-30 Ntt Mobile Communications Network Inc. Method and system for CDMA mobile communication
US5883899A (en) * 1995-05-01 1999-03-16 Telefonaktiebolaget Lm Ericsson Code-rate increased compressed mode DS-CDMA systems and methods
US6084884A (en) * 1996-06-19 2000-07-04 Ntt Mobile Communications Network, Inc. CDMA communication method and group spreading modulator
US6130884A (en) * 1996-12-05 2000-10-10 Nec Corporation Variable rate CDMA spread circuit
US6041034A (en) * 1996-12-20 2000-03-21 Fujitsu Limited Spread spectrum communication system
US6108369A (en) * 1997-07-11 2000-08-22 Telefonaktiebolaget Lm Ericsson Channelization code allocation for radio communication systems
US6222875B1 (en) * 1997-07-11 2001-04-24 Telefonaktiebolaget Lm Ericsson (Publ) Low-delay rate detection for variable rate communication systems
US6009091A (en) * 1998-03-13 1999-12-28 Motorola, Inc. Method and apparatus for mobile station location within a communication system
US6477158B2 (en) * 1998-03-16 2002-11-05 Mitsubishi Denki Kabushiki Kaisha Method and apparatus for assigning codes
US6643275B1 (en) * 1998-05-15 2003-11-04 Telefonaktiebolaget Lm Ericsson (Publ) Random access in a mobile telecommunications system
US6381229B1 (en) * 1998-05-15 2002-04-30 Telefonaktielbolaget L M Ericsson (Publ) Random access in a mobile telecommunications system
US6542484B1 (en) * 1998-05-15 2003-04-01 Telefonaktiebolaget Lm Ericsson (Publ) Code allocation for radiocommunication systems
US6570889B1 (en) * 1998-05-15 2003-05-27 Sony International (Europe) Gmbh Transmitter and transmitting method increasing the flexibility of code assignment
US6317413B1 (en) * 1998-05-18 2001-11-13 Nokia Mobile Phones Ltd. Method and apparatus for assigning variable length walsh codes in a spread spectrum system
US6631125B1 (en) * 1999-10-20 2003-10-07 Nokia Corporation Channel set-up in wideband, code division multiple access systems
US6920552B2 (en) * 2001-03-16 2005-07-19 Broadcom Corporation Network interface with double data rate and delay locked loop

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050169349A1 (en) * 1999-08-17 2005-08-04 Samsung Electronics Co., Ltd. Method for communicating scrambling code ID in mobile communication system
US7869454B2 (en) * 1999-08-17 2011-01-11 Samsung Electronics Co., Ltd Method for communicating scrambling code ID in mobile communication system
US8831554B2 (en) * 2008-02-06 2014-09-09 At&T Mobility Ii Llc Management of a multi-application mobile carrier tree

Also Published As

Publication number Publication date Type
US7139260B2 (en) 2006-11-21 grant
ES2222035T5 (en) 2010-12-22 grant
JP4087316B2 (en) 2008-05-21 grant
FI981546D0 (en) grant
EP1012995B1 (en) 2004-06-09 grant
US6975615B1 (en) 2005-12-13 grant
US20050243763A1 (en) 2005-11-03 application
CN1273716A (en) 2000-11-15 application
CN1131599C (en) 2003-12-17 grant
EP1012995B2 (en) 2010-07-21 grant
JP2004040826A (en) 2004-02-05 application
JP2002520900A (en) 2002-07-09 application
FI981546A0 (en) 1998-07-03 application
WO2000002326A3 (en) 2000-02-24 application
WO2000002326A2 (en) 2000-01-13 application
ES2222035T7 (en) 2014-01-27 grant
ES2222035T3 (en) 2005-01-16 grant
DE69917875T2 (en) 2005-06-09 grant
FI981546A (en) 2000-01-04 application
DE69917875T3 (en) 2014-04-03 grant
EP1012995B3 (en) 2013-10-16 grant
EP1012995A2 (en) 2000-06-28 application
DE69917875D1 (en) 2004-07-15 grant

Similar Documents

Publication Publication Date Title
US5777990A (en) Method and apparatus for providing variable rate data in a communications system using non-orthogonal overflow channels
US5793744A (en) Multichannel high-speed data transfer
US6785323B1 (en) Variable rate coding for forward link
RU2216101C2 (en) Data transmission device and method for mobile communication system with allocated control channel
EP0977393A1 (en) Cdma communication method
US20010022782A1 (en) Reducing interference in inter-frequency measurement
US5859840A (en) Spread spectrum communication system which defines channel groups comprising selected channels that are additional to a primary channel and transmits group messages during call set up
RU2201033C2 (en) Device and method for exchanging messages of different-length frames in code-division multiple access communication system
US6675016B2 (en) Method for transmitting radio signals, radio communication access network and terminal using same
US20020006119A1 (en) Defining measurement gaps in inter-frequency measurement
US6973140B2 (en) Maximizing data rate by adjusting codes and code rates in CDMA system
US20040174850A1 (en) Method and device for providing a predetermined transmission rate for an auxiliary information
US5909434A (en) Bright and burst mode signaling data transmission in an adjustable rate wireless communication system
US6646993B1 (en) Communication apparatus and method of format adaptation therefor
US6396804B2 (en) High data rate CDMA wireless communication system
US7085248B1 (en) Method of identifying information addressed to a user in a communication system and a communication system
US5930230A (en) High data rate CDMA wireless communication system
US6353638B1 (en) Method and system for digital signal transmission
US5926500A (en) Reduced peak-to-average transmit power high data rate CDMA wireless communication system
US6359865B1 (en) Method of implementing macrodiversity
US20070201406A1 (en) Method and apparatus for multiplexing multiple reverse feedback channels in multi-carrier wireless networks
US6707859B1 (en) Reception method and receiver using several different transport formats
US6636497B1 (en) Air interface capacity scheduling method
US20030012128A1 (en) Radio base station apparatus and communication terminal apparatus
US20030072305A1 (en) Method and apparatus for processing shared subpackets in a communication system

Legal Events

Date Code Title Description
AS Assignment

Owner name: NOKIA CORPORATION, FINLAND

Free format text: CHANGE OF NAME;ASSIGNOR:NOKIA NETWORKS OY;REEL/FRAME:018436/0673

Effective date: 19991001

Owner name: NOKIA NETWORKS OY, FINLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TOSKALA, ANTTI;HONKASALO, ZHI-CHUN;REEL/FRAME:018436/0669;SIGNING DATES FROM 20000222 TO 20000223

AS Assignment

Owner name: QUALCOMM INCORPORATED, CALIFORNIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NOKIA CORPORATION;REEL/FRAME:021998/0842

Effective date: 20081028