WO2011062660A1 - Procédé et appareil permettant à un ue d'établir sa position dans des terminaux multimodes td-scdma - Google Patents

Procédé et appareil permettant à un ue d'établir sa position dans des terminaux multimodes td-scdma Download PDF

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Publication number
WO2011062660A1
WO2011062660A1 PCT/US2010/035689 US2010035689W WO2011062660A1 WO 2011062660 A1 WO2011062660 A1 WO 2011062660A1 US 2010035689 W US2010035689 W US 2010035689W WO 2011062660 A1 WO2011062660 A1 WO 2011062660A1
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Prior art keywords
cells
candidate
subset
cell
reference cell
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PCT/US2010/035689
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English (en)
Inventor
Tom Chin
Guangming Shi
Kuo-Chun Lee
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Qualcomm Incorporated
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Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to CN201080000967XA priority Critical patent/CN102144172A/zh
Priority to TW099116536A priority patent/TW201135272A/zh
Publication of WO2011062660A1 publication Critical patent/WO2011062660A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/0009—Transmission of position information to remote stations
    • G01S5/0018—Transmission from mobile station to base station
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/10—Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements, e.g. omega or decca systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Definitions

  • aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to methods and apparatus for UE-based position determination in TD-SCDMA multimode terminals.
  • Wireless communication networks are widely deployed to provide various communication services such as telephony, video, data, messaging, broadcasts, and so on.
  • Such networks which are usually multiple access networks, support communications for multiple users by sharing the available network resources.
  • UTRAN Universal Terrestrial Radio Access Network
  • the UTRAN is the radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS), a third generation (3G) mobile phone technology supported by the 3rd Generation Partnership Project (3 GPP).
  • UMTS Universal Mobile Telecommunications System
  • 3 GPP 3rd Generation Partnership Project
  • the UMTS which is the successor to Global System for Mobile Communications (GSM) technologies, currently supports various air interface standards, such as Wideband-Code Division Multiple Access (W-CDMA), Time Division-Code Division Multiple Access (TD-CDMA), and Time Division- Synchronous Code Division Multiple Access (TD-SCDMA).
  • W-CDMA Wideband-Code Division Multiple Access
  • TD-CDMA Time Division-Code Division Multiple Access
  • TD-SCDMA Time Division- Synchronous Code Division Multiple Access
  • the UMTS also supports enhanced 3G data communications protocols, such as High Speed Downlink Packet Data (HSDPA), which provides higher data transfer speeds and capacity to associated UMTS networks.
  • HSDPA High Speed Downlink Packet Data
  • Location-based services are popular services being provided to enhance the user experience. However, to provide these services, it is desired that as accurate the location determination is as possible be achieved.
  • a method of wireless communication includes selecting a subset of candidate cells from a plurality of neighboring cells based on a criterion; identifying a reference cell; determining a characteristic associated with propagation times associated with both the reference cell and the subset of candidate cells; and setting a position based on the determined characteristic.
  • an apparatus for wireless communication includes means for selecting a subset of candidate cells from a plurality of neighboring cells based on a criterion; means for identifying a reference cell; means for determining a characteristic associated with propagation times associated with both the reference cell and the subset of candidate cells; and means for setting a position based on the determined characteristic.
  • a computer program product includes a computer-readable medium including code for selecting a subset of candidate cells from a plurality of neighboring cells based on a criterion; identifying a reference cell; determining a characteristic associated with propagation times associated with both the reference cell and the subset of candidate cells; and setting a position based on the determined characteristic.
  • an apparatus for wireless communication includes a processor.
  • the processor is configured to select a subset of candidate cells from a plurality of neighboring cells based on a criterion; identify a reference cell; determine a characteristic associated with propagation times associated with both the reference cell and the subset of candidate cells; and set a position based on the determined characteristic.
  • FIG. 1 is a block diagram conceptually illustrating an example of a telecommunications system.
  • FIG. 2 is a block diagram conceptually illustrating an example of a frame structure in a telecommunications system.
  • FIG. 3 is a block diagram conceptually illustrating an example of a Node B in communication with a UE in a telecommunications system.
  • FIG. 4 is a block diagram conceptually illustrating an example of a processing system of the UE of FIG.3.
  • FIG. 5 is a diagram of a CDMAlx frame structure as compared to a TD-
  • FIG. 6 is a flow diagram of a process for determining a UE's position in accordance with an aspect of the present disclosure.
  • FIG. 7 is a timing diagram of the process for determining a UE's position in accordance with an aspect of the present disclosure.
  • FIG. 8 is a conceptual block diagram illustrating the functionality of an exemplary UE apparatus.
  • FIG. 1 a block diagram is shown illustrating an example of a telecommunications system 100.
  • the various concepts presented throughout this disclosure may be implemented across a broad variety of telecommunication systems, network architectures, and communication standards.
  • the aspects of the present disclosure illustrated in FIG. 1 are presented with reference to a UMTS system employing a TD-SCDMA standard.
  • the UMTS system includes a (radio access network) RAN 102 (e.g., UTRAN) that provides various wireless services including telephony, video, data, messaging, broadcasts, and/or other services.
  • RAN 102 e.g., UTRAN
  • the RAN 102 may be divided into a number of Radio Network Subsystems (RNSs) such as an RNS 107, each controlled by a Radio Network Controller (RNC) such as an RNC 106.
  • RNC Radio Network Controller
  • the RNC 106 is an apparatus responsible for, among other things, assigning, reconfiguring and releasing radio resources within the RNS 107.
  • the RNC 106 may be interconnected to other RNCs (not shown) in the RAN 102 through various types of interfaces such as a direct physical connection, a virtual network, or the like, using any suitable transport network.
  • the geographic region covered by the RNS 107 may be divided into a number of cells, with a radio transceiver apparatus serving each cell.
  • a radio transceiver apparatus is commonly referred to as a Node B in UMTS applications, but may also be referred to by those skilled in the art as a base station (BS), a base transceiver station (BTS), a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), an access point (AP), or some other suitable terminology.
  • BS basic service set
  • ESS extended service set
  • AP access point
  • two Node Bs 108 are shown; however, the RNS 107 may include any number of wireless Node Bs.
  • the Node Bs 108 provide wireless access points to a core network 104 for any number of mobile apparatuses.
  • a mobile apparatus include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a notebook, a netbook, a smartbook, a personal digital assistant (PDA), a satellite radio, a global positioning system (GPS) device, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • GPS global positioning system
  • multimedia device e.g., a digital audio player (e.g., MP3 player), a camera, a game console, or any other similar functioning device.
  • MP3 player digital audio player
  • the mobile apparatus is commonly referred to as user equipment (UE) in UMTS applications, but may also be referred to by those skilled in the art as a mobile station (MS), a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal (AT), a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other suitable terminology.
  • UE user equipment
  • MS mobile station
  • AT access terminal
  • three UEs 110 are shown in communication with the Node Bs 108.
  • the downlink (DL), also called the forward link refers to the communication link from a Node B to a UE
  • the uplink (UL) also called the reverse link
  • the core network 104 includes a GSM core network.
  • GSM Global System for Mobile communications
  • the core network 104 supports circuit-switched services with a mobile switching center (MSC) 112 and a gateway MSC (GMSC) 114.
  • MSC mobile switching center
  • GMSC gateway MSC
  • the MSC 112 is an apparatus that controls call setup, call routing, and UE mobility functions.
  • the MSC 112 also includes a visitor location register (VLR) (not shown) that contains subscriber-related information for the duration that a UE is in the coverage area of the MSC 112.
  • VLR visitor location register
  • the GMSC 114 provides a gateway through the MSC 112 for the UE to access a circuit-switched network 116.
  • the GMSC 114 includes a home location register (HLR) (not shown) containing subscriber data, such as the data reflecting the details of the services to which a particular user has subscribed.
  • HLR home location register
  • the HLR is also associated with an authentication center (AuC) that contains subscriber-specific authentication data.
  • AuC authentication center
  • the core network 104 also supports packet-data services with a serving GPRS support node (SGSN) 118 and a gateway GPRS support node (GGSN) 120.
  • GPRS which stands for General Packet Radio Service, is designed to provide packet-data services at speeds higher than those available with standard GSM circuit-switched data services.
  • the GGSN 120 provides a connection for the RAN 102 to a packet- based network 122.
  • the packet-based network 122 may be the Internet, a private data network, or some other suitable packet-based network.
  • the primary function of the GGSN 120 is to provide the UEs 110 with packet-based network connectivity. Data packets are transferred between the GGSN 120 and the UEs 110 through the SGSN 118, which performs primarily the same functions in the packet-based domain as the MSC 112 performs in the circuit-switched domain.
  • the UMTS air interface is a spread spectrum Direct-Sequence Code Division
  • DS-CDMA Spread spectrum Multiple Access
  • the TD-SCDMA standard is based on such direct sequence spread spectrum technology and additionally calls for a time division duplexing (TDD), rather than a frequency division duplexing (FDD) as used in many FDD mode UMTS/W-CDMA systems.
  • TDD uses the same carrier frequency for both the uplink (UL) and downlink (DL) between a Node B 108 and a UE 110, but divides uplink and downlink transmissions into different time slots in the carrier.
  • FIG. 2 shows a frame structure 200 for a TD-SCDMA carrier.
  • the TD-SCDMA carrier The TD-SCDMA carrier
  • SCDMA carrier as illustrated, has a frame 202 that is 10 ms in length.
  • the frame 202 has two 5 ms subframes 204, and each of the subframes 204 includes seven time slots, TSO through TS6.
  • the first time slot, TSO is usually allocated for downlink communication
  • the second time slot, TS1 is usually allocated for uplink communication.
  • the remaining time slots, TS2 through TS6, may be used for either uplink or downlink, which allows for greater flexibility during times of higher data transmission times in either the uplink or downlink directions.
  • a downlink pilot time slot (DwPTS) 206, a guard period (GP) 208, and an uplink pilot time slot (UpPTS) 210 are located between TSO and TS1.
  • Each time slot, TS0-TS6, may allow data transmission multiplexed on a maximum of 16 code channels.
  • Data transmission on a code channel includes two data portions 212 separated by a midamble 214 and followed by a guard period (GP) 216.
  • the midamble 214 may be used for features, such as channel estimation, while the GP 216 may be used to avoid inter-burst interference.
  • FIG. 3 is a block diagram of a Node B 310 in communication with a UE 350 in a RAN 300, where the RAN 300 may be the RAN 202 in FIG. 2, the Node B 310 may be the Node B 208 in FIG. 2, and the UE 350 may be the UE 210 in FIG. 2.
  • a transmit processor 320 may receive data from a data source 312 and control signals from a controller/processor 340.
  • the transmit processor 320 provides various signal processing functions for the data and control signals, as well as reference signals (e.g., pilot signals).
  • the transmit processor 320 may provide cyclic redundancy check (CRC) codes for error detection, coding and interleaving to facilitate forward error correction (FEC), mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M- quadrature amplitude modulation (M-QAM), and the like), spreading with orthogonal variable spreading factors (OVSF), and multiplying with scrambling codes to produce a series of symbols.
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M- quadrature amplitude modulation
  • OVSF orthogonal variable spreading factors
  • These channel estimates may be derived from a reference signal transmitted by the UE 350 or from feedback contained in the midamble 214 (FIG. 2) from the UE 350.
  • the symbols generated by the transmit processor 320 are provided to a transmit frame processor 330 to create a frame structure.
  • the transmit frame processor 330 creates this frame structure by multiplexing the symbols with a midamble 214 (FIG. 2) from the controller/processor 340, resulting in a series of frames.
  • the frames are then provided to a transmitter 332, which provides various signal conditioning functions including amplifying, filtering, and modulating the frames onto a carrier for downlink transmission over the wireless medium through the one or more smart antenna 334.
  • the one or more smart antenna 334 may be implemented with beam steering bidirectional adaptive antenna arrays or other similar beam technologies.
  • a receiver 354 receives the downlink transmission through one or more antennas 352 and processes the transmission to recover the information modulated onto the carrier.
  • the information recovered by the receiver 354 is provided to a receive frame processor 360, which parses each frame, and provides the midamble 214 (FIG. 2) to a channel processor 394 and the data, control, and reference signals to a receive processor 370.
  • the receive processor 370 then performs the inverse of the processing performed by the transmit processor 320 in the Node B 310. More specifically, the receive processor 370 descrambles and despreads the symbols, and then determines the most likely signal constellation points transmitted by the Node B 310 based on the modulation scheme.
  • the soft decisions may be based on channel estimates computed by the channel processor 394.
  • the soft decisions are then decoded and deinterleaved to recover the data, control, and reference signals.
  • the CRC codes are then checked to determine whether the frames were successfully decoded.
  • the data carried by the successfully decoded frames will then be provided to a data sink 372, which represents applications running in the UE 350 and/or various user interfaces (e.g., display).
  • Control signals carried by successfully decoded frames will be provided to a controller/processor 390.
  • the controller/processor 390 may also use an acknowledgement (ACK) and/or negative acknowledgement (NACK) protocol to support retransmission requests for those frames.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • a transmit processor 380 receives data from a data source 378 and control signals from the controller/processor 390 and provides various signal processing functions including CRC codes, coding and interleaving to facilitate FEC, mapping to signal constellations, spreading with OVSFs, and scrambling to produce a series of symbols.
  • Channel estimates may be used to select the appropriate coding, modulation, spreading, and/or scrambling schemes.
  • the symbols produced by the transmit processor 380 will be provided to a transmit frame processor 382 to create a frame structure.
  • the transmit frame processor 382 creates this frame structure by multiplexing the symbols with a midamble 214 (FIG. 2) from the controller/processor 390, resulting in a series of frames.
  • the frames are then provided to a transmitter 356, which provides various signal conditioning functions including amplification, filtering, and modulating the frames onto a carrier for uplink transmission over the wireless medium through the one or more antenna 352.
  • the uplink transmission is processed at the Node B 310 in a manner similar to that described in connection with the receiver function at the UE 350.
  • a receiver 335 receives the uplink transmission through the one or more antenna 334 and processes the transmission to recover the information modulated onto the carrier.
  • the information recovered by the receiver 335 is provided to a receive frame processor 336, which parses each frame, and provides the midamble 214 (FIG. 2) to the channel processor 344 and the data, control, and reference signals to a receive processor 338.
  • the receive processor 338 performs the inverse of the processing performed by the transmit processor 380 in the UE 350.
  • the data and control signals carried by the successfully decoded frames may then be provided to a data sink 339 and the controller/processor, respectively. If some of the frames were unsuccessfully decoded by the receive processor, the controller/processor 340 may also use an ACK and/or NACK protocol to support retransmission requests for those frames.
  • the controller/processors 340 and 390 may be used to direct the operation at the Node B 310 and the UE 350, respectively.
  • the controller/processors 340 and 390 may provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions.
  • the computer readable media of memories 342 and 392 may store data and software for the Node B 310 and the UE 350, respectively.
  • a scheduler/processor 346 at the Node B 310 may be used to allocate resources to the UEs and schedule downlink and/or uplink transmissions for the UEs.
  • FIG. 4 is a block diagram illustrating a configuration for an apparatus 400, which can be a UE 110.
  • the apparatus 400 may include a wireless interface 402, a processing system 404, and machine-readable media 406.
  • the wireless interface 402 may be integrated into the processing system 404 or distributed across multiple entities in the apparatus.
  • the processing system 404 may be implemented with one or more processors.
  • the one or more processors may be implemented with any combination of general-purpose microprocessors, microcontrollers, digital signal processors (DSPs), digital signal processing devices (DSPDs), field programmable gate array (FPGAs), programmable logic devices (PLDs), controllers, integrated circuits (ICs), application specific ICs (ASICs), state machines, gated logic, discrete hardware components, or any other suitable entities that can perform calculations or other manipulations of information.
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • FPGAs field programmable gate array
  • PLDs programmable logic devices
  • controllers integrated circuits (ICs), application specific ICs (ASICs), state machines, gated logic, discrete hardware components, or any other suitable entities that can perform calculations or other manipulations of information.
  • the processing system 404 is coupled to machine-readable media 406 for storing software.
  • the processing system 404 may itself include the machine-readable media 406.
  • Software shall be construed broadly to mean any type of instructions, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. Instructions may include code (e.g., in source code format, binary code format, executable code format, or any other suitable format of code). The instructions, when executed by the one or more processors, cause the processing system 404 to perform the various functions described below, as well as various protocol processing functions.
  • a code segment can represent a procedure, a function, a subprogram, a program, a routine, a subroutine, a module, a software package, a class, or any combination of instructions, data structures, or program statements.
  • a code segment can be coupled to another code segment or a hardware circuit by passing and/or receiving information, data, arguments, parameters, or memory contents. Information, arguments, parameters, and/or data can be passed, forwarded, or transmitted using any suitable means including memory sharing, message passing, token passing, and network transmission.
  • the techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein.
  • the software codes can be stored in memory units and executed by processors.
  • the memory unit can be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art.
  • the TD-SCDMA standards provide position determination for UEs without the use of GPS receivers using three schemes:
  • Cell ID Use the current cell to approximate the UE's position.
  • UE-assisted Observed Time Difference of Arrival The UE measures the difference in time of arrival of several cells and signals the measurement results to the network, where the network carries out the position calculation.
  • the OTDOA uses the SFN-SFN (System Frame Number-to-System Frame Number) observed time difference between the neighbor cell and the reference cell.
  • UE-based OTDOA The UE measures the difference in time of arrival of several cells and also carries out the position calculation. Finally, the UE signals the positioning results to the network.
  • the TD-SCDMA standards specify that the
  • Node B broadcasts the position information of the serving cell and the neighbor cells in the system information message.
  • the system information block type 15.5 (SIB- 15.5) includes the OTDOA assistance data for UE-based Information Elements (IE).
  • This IE indicates the position information for the serving cell and neighbor cells. Specifically, the latitude and longitude information for the reference cell is included.
  • the UE positioning OTDOA neighbor cell info for UE-based IE the relative position to the reference cell is given for a neighbor cell.
  • UE-based positioning may require at least three base station measurements in addition to a reference base station. Specifically, an observed time difference between each of three base stations and the reference base station is needed. Because the UE may not be able to receive valid signal from a sufficient number of base stations in the TD-SCDMA network, in one aspect of the disclosure a multimode TD-SCDMA UE can utilize the CDMA lx network to improve signal detection and perform other measurements for UE position calculation.
  • UE position may be estimated using the observed time difference of base stations in the CDMA lx BS as well as the base stations in the TD-SCDMA network.
  • TD-SCDMA and CDMA lx systems are synchronous. Specifically, TD-SCDMA frames, which are 10-ms in length, and CDMA frames, which are 20-ms in length, are aligned. These frames are also aligned with GPS time. In CDMA lx system, the location of the serving base station (BS) is indicated in the System Parameters Message (SPM).
  • SPM System Parameters Message
  • UE location estimation is supported by the search and measurements of a CDMA lx network in addition to the TD-SCDMA network for a multimode terminal.
  • a multimode (TD-SCDMA and CDMA lx) terminal may search for CDMA lx base station signals as well as TD-SCDMA base station signals to improve the availability and accuracy of the UE positioning process.
  • step 602 cells (base stations) within range of a UE 702, referred to as neighboring cells such as cells710, 712, 720 and 722, are chosen for inclusion in a group of candidate base stations.
  • a signal to interference plus noise ratio is chosen as the metric to select preferred candidate base stations such that:
  • ⁇ Candidate TD-SCDMA NB may be determined by measuring Signal-to-
  • SIR Interference Ratio of the Primary Common Control Physical Channel (P- CCPCH), denoted by S_td(i) in dB.
  • index i reference each available TD- SCDMA NB with an available signal measurement.
  • Candidate CDMA lx base station may be determined by measuring its pilot
  • S_cd(j) Signal-to-Interference and Noise Ratio
  • the multimode terminal can choose the best M base stations, where
  • ⁇ TD-SCDMA NB S_td(i) - Offset td
  • Offset td Offset cd (in dB)
  • RAT Radio Access Technology
  • step 604 in one aspect of the disclosure, the strongest TD-SCDMA Node B from the candidate cells in the above signal measurement procedure will be chosen as a reference cell, identified as TD reference cell 710.
  • step 606 the UE measures the time difference from each neighbor cell (TD-
  • the observed time difference in TD-SCDMA network is defined as a System Frame Number (SFN-SFN) observed time difference. That is, the UE 702 can measure the delay in received frame boundary of the neighbor cell relative to the reference cell.
  • SFN-SFN observed time difference is defined as the arrival time difference of a frame boundary of a TD-SCDMA/CDMA lx neighbor cell relative to the reference cell.
  • the SFN-SFN observed time difference is positive if the frame boundary of the neighbor cell is detected to be received later than the frame boundary of the reference cell.
  • FIG. 5 includes a frame timing diagram 500 that illustrates the concept of determining a difference between a CDMA lx frame boundary and a TD-SCDMA frame boundary.
  • the time difference measurement is performed on at least three neighbor base station (TD-SDMA NB or CDMA BS), such as TD neighbor cell A 712, CDMAlx cell B 720 and CDMAlx neighbor cell C 722 relative the TD-SCDMA reference cell 710 in the above procedure.
  • TD-SDMA NB or CDMA BS neighbor base station
  • the UE 702 acquires the positions of the TD-SCDMA reference cell 710 and neighbor cells such as the TD neighbor cell A 712 in the TD-SCDMA network from SIB-15.5.
  • the UE 702 needs to acquire the SPM for each of these neighbor cells.
  • step 610 the UE 702 utilizes the observed time difference and the location of these base stations to estimate the UE location.
  • FIG. 8 is a functional block diagram 800 illustrating example blocks executed in conducting wireless communication according to one aspect of the present disclosure.
  • Block 802 includes selecting a subset of candidate cells from a plurality of neighboring cells based on a criterion.
  • block 804 includes identifying a reference cell.
  • block 806 includes determining a characteristic associated with propagation times associated with both the reference cell and the subset of candidate cells.
  • block 808 includes setting a position based on the determined characteristic.
  • the apparatus 350 for wireless communication includes means for selecting a subset of candidate cells from a plurality of neighboring cells based on a criterion; means for identifying a reference cell; means for determining a characteristic associated with propagation times associated with both the reference cell and the subset of candidate cells; and means for setting a position based on the determined characteristic.
  • the aforementioned means may be the processor 390 configured to perform the functions recited by the aforementioned means.
  • the aforementioned means may be a module or any apparatus configured to perform the functions recited by the aforementioned means.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • CDMA2000 Evolution-Data Optimized
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Ultra-Wideband
  • Bluetooth Bluetooth
  • the actual telecommunication standard, network architecture, and/or communication standard employed will depend on the specific application and the overall design constraints imposed on the system.
  • processors have been described in connection with various apparatuses and methods. These processors may be implemented using electronic hardware, computer software, or any combination thereof. Whether such processors are implemented as hardware or software will depend upon the particular application and overall design constraints imposed on the system.
  • a processor, any portion of a processor, or any combination of processors presented in this disclosure may be implemented with a microprocessor, microcontroller, digital signal processor (DSP), a field-programmable gate array (FPGA), a programmable logic device (PLD), a state machine, gated logic, discrete hardware circuits, and other suitable processing components configured to perform the various functions described throughout this disclosure.
  • DSP digital signal processor
  • FPGA field-programmable gate array
  • PLD programmable logic device
  • the functionality of a processor, any portion of a processor, or any combination of processors presented in this disclosure may be implemented with software being executed by a microprocessor, microcontroller, DSP, or other suitable platform.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the software may reside on a computer-readable medium.
  • a computer- readable medium may include, by way of example, memory such as a magnetic storage device (e.g., hard disk, floppy disk, magnetic strip), an optical disk (e.g., compact disc (CD), digital versatile disc (DVD)), a smart card, a flash memory device (e.g., card, stick, key drive), random access memory (RAM), read only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), a register, or a removable disk.
  • memory is shown separate from the processors in the various aspects presented throughout this disclosure, the memory may be internal to the processors (e.g., cache or register).
  • Computer-readable media may be embodied in a computer-program product.
  • a computer-program product may include a computer-readable medium in packaging materials.

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  • General Physics & Mathematics (AREA)
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Abstract

Procédé, appareil et produit programme d'ordinateur appliqués à la communication sans fil, le procédé de communication sans fil comprenant les étapes consistant à : identifier une cellule de référence ; sélectionner une pluralité de cellules candidates compte tenu d'un critère ; établir une caractéristique de la cellule de référence et de la pluralité de cellules candidates ; et fixer une position compte tenu de la caractéristique établie.
PCT/US2010/035689 2009-11-20 2010-05-20 Procédé et appareil permettant à un ue d'établir sa position dans des terminaux multimodes td-scdma WO2011062660A1 (fr)

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