WO2011062655A1 - Procédé et appareil facilitant la synchronisation montante - Google Patents

Procédé et appareil facilitant la synchronisation montante Download PDF

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Publication number
WO2011062655A1
WO2011062655A1 PCT/US2010/034531 US2010034531W WO2011062655A1 WO 2011062655 A1 WO2011062655 A1 WO 2011062655A1 US 2010034531 W US2010034531 W US 2010034531W WO 2011062655 A1 WO2011062655 A1 WO 2011062655A1
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WIPO (PCT)
Prior art keywords
node
protocol
message received
degrees
round trip
Prior art date
Application number
PCT/US2010/034531
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English (en)
Inventor
Tom Chin
Guangming Shi
Kuo-Chun Lee
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to CN2010800012564A priority Critical patent/CN102273284A/zh
Priority to TW099115708A priority patent/TW201119454A/zh
Publication of WO2011062655A1 publication Critical patent/WO2011062655A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/006—Synchronisation arrangements determining timing error of reception due to propagation delay using known positions of transmitter and receiver

Definitions

  • aspects of the present disclosure relate generally to wireless communication systems, and more particularly, for facilitating uplink synchronization during a random access procedure.
  • 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
  • a method includes determining a round trip delay between a node B and a user equipment (UE), and adjusting uplink transmission timing based on the determined round trip delay.
  • UE user equipment
  • an apparatus includes means for determining a round trip delay between a node B and a UE, and means for adjusting uplink transmission timing based on the determined round trip delay.
  • a computer program product includes a computer-readable medium which includes code for determining a round trip delay between a node B and a UE, and code for adjusting uplink transmission timing based on the determined round trip delay.
  • an apparatus includes at least one processor, and a memory coupled to the at least one processor.
  • the at least one processor may be configured to determine a round trip delay between a node B and a UE, and adjust uplink transmission timing based on the determined round trip delay.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • 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 functional block diagram conceptually illustrating example blocks executed to implement the functional characteristics of one aspect of the present disclosure.
  • FIG. 5 is a diagram conceptually illustrating an exemplary TD-SCDMA based system with multiple UEs communicating with a node B as time progresses in an aspect of the present disclosure.
  • FIG. 6 is a diagram conceptually illustrating an exemplary UL transmission including an estimated round trip delay time in an aspect of the present disclosure.
  • FIG. 7 is a block diagram of an exemplary wireless communications device configured to facilitate user equipment uplink synchronization during a random access procedure according to an aspect.
  • FIG. 8 is a block diagram depicting the architecture of a node B configured to facilitate user equipment uplink synchronization during a random access procedure according to an aspect.
  • 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.
  • 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.
  • RNSs Radio Network Subsystems
  • 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 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.
  • 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 UL and 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, TS0 through TS6.
  • the first time slot, TS0 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 TS0 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 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 102 in FIG. 1, the Node B 310 may be the Node B 108 in FIG. 1, and the UE 350 may be the UE 110 in FIG. 1.
  • 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 smart antennas 334.
  • the smart antennas 334 may be implemented with beam steering bidirectional adaptive antenna arrays or other similar beam technologies.
  • a receiver 354 receives the downlink transmission through an antenna 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. These 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 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 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.
  • controller/processors 340 and 390 may enable communications using a random access procedure.
  • efficient uplink synchronization may be beneficial for system performance.
  • different UEs may synchronize on the UL such that all UE transmitted signals arrive at the Node B 310 defined times. As such, a UE farther from node B may advance its UL transmission timing more than a UE nearer to the node B.
  • the UE may transmit an uplink synchronization
  • a base station may measure timing and may send a correction command using an ACK message on a Fast Physical Access Channel (FPACH).
  • FPACH Fast Physical Access Channel
  • the UE may determine an initial timing for sending the SYNC UL code in order to minimize any subsequent corrections.
  • the UE may use the downlink (DL) receive power to estimate the propagation loss in order to estimate the initial transmit timing because more propagation loss, more timing advance is needed. However, this may not be a sufficiently accurate method as the received signal power may fluctuate [0034] Further, in a TD-SCDMA system, using a random access procedure, various channels and configurations may be used.
  • a random access channel (RACH) transmission time interval may be denoted by L subframes (e.g. 1 for 5ms, 2 for 10 ms, 4 for 20 ms), and one FPACH may correspond to N PRACHs, where N ⁇ L.
  • ACK acknowledgement
  • Table 1 TD-SCDMA standard FPACH ACK
  • the UE uses PRACH n to transmit to avoid a collision with another UE. Still further, transmission of RACH may start two subframes following FPACH reception, but if FPACH is received on an odd subframe number and L > 1, then transmission of RACH may start three subframes following FPACH reception.
  • UE 350 and node B 310 may communicate using a random access procedure facilitated through random access modules which are operable to facilitate uplink synchronization.
  • an uplink synchronization module may determine SYNC UL code transmission timing through analyzing the UE position, as determined through position sensor, and the base station position, as provided by base station position, for example, in a system information message.
  • position sensor may determine UE position through: GPS based information, wireless local area network (WLAN) based information, etc.
  • node B 310 may broadcast position information. In one aspect, such position information may be included in the system information message.
  • the system information block type 15.5 (SIB-15.5) includes the observed time difference of arrival (OTDOA) assistance data for UE-based information element (IE).
  • This IE may indicate the position information for the node B 310.
  • degree of latitude and degree of longitude information for the node B is included.
  • the node B position may be denoted by (x cell, y cell), and the
  • UE current position as determined by a position sensor module, may be denoted as (x ue, y ue). Therefore, in one example, UE 350 may calculate its distance from the node B 310 for performing the random access procedure, using equation (1) as follows:
  • d(NB, UE) f ((x_cell, y_cell), (x_ue, y_ue)) ( 1 )
  • the function f() may allow a UE to calculate the distance between two points using with the latitude and longitude of said points.
  • the UE may estimate timing for transmitting a SYNC_UL code by advancing the starting of UpPCH (Uplink Pilot Channel) compared to the receive timing, with the time as determined using equation (2), which states:
  • UpPCH Uplink Pilot Channel
  • equation (2) represents the round trip delay (RTD) between the node B and the UE.
  • the UE UL synchronization transmission for a SYNC UL code may be advanced by the RTD estimated by equation (2).
  • UL synchronization may be achieved when the UE advances the UpPCH from the DL timing by the RTD.
  • the UpPCH transmission without advancement can be estimated by the end of DwPTS received by the UE, offset by the duration of a gap between DwPTS and UpPTS (e.g., an offset).
  • FIG. 4 illustrates various methodologies in accordance with various aspects of the presented subject matter. While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts or sequence steps, it is to be understood and appreciated that the claimed subject matter is not limited by the order of acts, as some acts may occur in different orders and/or concurrently with other acts from that shown and described herein. For example, those skilled in the art will understand and appreciate that a methodology could alternatively be represented as a series of interrelated states or events, such as in a state diagram. Moreover, not all illustrated acts may be required to implement a methodology in accordance with the claimed subject matter.
  • FIG. 4 is a functional block diagram 400 illustrating example blocks executed in conducting wireless communication according to one aspect of the present disclosure.
  • a UE may receive a message from a node B.
  • the message may be a system information message.
  • the system information message may include node B location information.
  • the system information block type 15.5 (SIB- 15.5) may include an observed time difference of arrival (OTDOA) assistance data for UE-based information element (IE).
  • OTDA observed time difference of arrival
  • This IE may indicate the position information for the node B.
  • the Ellipsoid IE degree of latitude and degree of longitude information for the current node B is included.
  • the UE may acquire the transmitting node B location. As described above, such information may be acquired from the transmitted system information message.
  • a location value associated with the UE may be determined.
  • the UE may determine position through: GPS based information, wireless local area network (WLAN) based information, Bluetooth based information etc.
  • the UE may calculate a round trip delay (RTD) value.
  • the RTD may be calculated using equations (1) and (2) discussed above.
  • the UE may advance an uplink synchronization transmission time by the calculated RTD to accurately estimate uplink synchronization with the node B.
  • the UE may transmit an uplink synchronization code at the determined advanced time.
  • FIG. 5 is a diagram conceptually illustrating an exemplary TD-SCDMA based system 500 with multiple UEs communicating with a node B as time progresses according to one aspect of the present disclosure.
  • multiple UEs may share a common bandwidth in communication with a node B 502.
  • TD-SCDMA systems are UL synchronization. That it, in TD-SCDMA systems, different UEs (504, 506, 508) may synchronize on the uplink (UL) such that all UEs (504, 506, 508) transmitted signals arrives at the node B at approximately the same time.
  • UL uplink
  • various UEs (504, 506, 508) are located at various distances from the serving node B 502. Accordingly, in order for the UL transmission to reach the node B 502 at approximately the same time, each UE may originate transmissions at different times.
  • UE(3) 508 may be farthest from node B 502 and may perform an UL transmission 514 before closer UEs.
  • UE 506(2) may be closer to node B 502 than UE(3) 508 and may perform an UL transmission 512 after UE(3) 508.
  • UE(1) 504 may be closer to node B 502 than UE(2) 506 and may perform an UL transmission 510 after UE(2) 506 and UE(3) 508.
  • the timing of the UL transmissions (510, 512, 514) may be such that the signals arrive at the node B at approximately the same time.
  • UL synchronization may be efficiently facilitated by each UE determining its own distance from the node B 502 and each UE transmitting a SYNC UL code using timing derived from the determined distance.
  • FIG. 6 a diagram conceptually illustrating an exemplary UL transmission including an estimated round trip delay time in a system 600 is presented.
  • Transmission timing for a node B 602 and a UE 604 are depicted in FIG. 6.
  • a subframe may include a downlink (DL) TS0, Downlink Pilot Time Slot (DwPTS) 606, a Gap 608, an Uplink Pilot Time Slot (UpPTS) 610, one or more uplink (UL) TSs, and then a few DL TSs.
  • DwPTS Downlink Pilot Time Slot
  • UpPTS Uplink Pilot Time Slot
  • a UE 604 UL synchronization transmission for a SYNC UL code may advanced by the round trip delay (RTD) 616.
  • RTD round trip delay
  • UL synchronization may be achieved when the UE 604 advances the UpPCH from the DL timing, by the RTD 616.
  • the UpPTS transmission without advancement can be estimated by the end of DwPTS received by the UE 612, offset by the duration of a gap 608 between DwPTS and UpPTS (e.g., an offset 614).
  • UE 700 comprises receiver 702 that receives one or more signal from, for instance, one or more receive antennas (not shown), performs typical actions on (e.g., filters, amplifies, downconverts, etc.) the received signal, and digitizes the conditioned signal to obtain samples.
  • Receiver 702 can further comprise an oscillator that can provide a carrier frequency for demodulation of the received signal and a demodulator that can demodulate received symbols and provide them to processor 706 for channel estimation.
  • UE 700 may further comprise secondary receiver 752 and may receive additional channels of information.
  • Processor 706 can be a processor dedicated to analyzing information received by receiver 702 and/or generating information for transmission by one or more transmitters 720 (for ease of illustration, only one transmitter is shown), a processor that controls one or more components of UE 700, and/or a processor that both analyzes information received by receiver 702 and/or secondary receiver 752, generates information for transmission by transmitter 720 for transmission on one or more transmitting antennas (not shown), and controls one or more components of UE 700.
  • UE 700 can additionally comprise memory 708 that is operatively coupled to processor 706 and that can store data to be transmitted, received data, information related to available channels, data associated with analyzed signal and/or interference strength, information related to an assigned channel, power, rate, or the like, and any other suitable information for estimating a channel and communicating via the channel.
  • Memory 708 can additionally store protocols and/or algorithms associated with estimating and/or utilizing a channel (e.g., performance based, capacity based, etc.).
  • nonvolatile memory can include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable PROM (EEPROM), or flash memory.
  • Volatile memory can include random access memory (RAM), which acts as external cache memory.
  • RAM is available in many forms such as synchronous RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and direct Rambus RAM (DRRAM).
  • SRAM synchronous RAM
  • DRAM dynamic RAM
  • SDRAM synchronous DRAM
  • DDR SDRAM double data rate SDRAM
  • ESDRAM enhanced SDRAM
  • SLDRAM Synchlink DRAM
  • DRRAM direct Rambus RAM
  • UE 700 can further comprise random access module 710 which may be operable to provide uplink synchronization for UE 700.
  • random access module 710 may include uplink synchronization module 712 and position sensor 714.
  • uplink synchronization module 712 is operable to determine SYNC UL code transmission timing through analyzing the UE 700 position, as determined through position sensor 714, and the base station position, as provided, for example, in a system information message.
  • position sensor 714 may determine UE position through: GPS based information, wireless local area network (WLAN) based information, Bluetooth based information, etc. Operation of such uplink synchronization assistance scheme is depicted in FIG. 4.
  • processor 706 may provide the means for determining a round trip delay between a node B and a user equipment (UE), and means for adjusting uplink transmission timing based on the determined round trip delay.
  • UE user equipment
  • UE 700 may include user interface 740.
  • User interface 740 may include input mechanisms 742 for generating inputs into UE 700, and output mechanism 744 for generating information for consumption by the user of UE 700.
  • input mechanism 742 may include a mechanism such as a key or keyboard, a mouse, a touch-screen display, a microphone, etc.
  • output mechanism 744 may include a display, an audio speaker, a haptic feedback mechanism, a Personal Area Network (PAN) transceiver etc.
  • output mechanism 744 may include a display operable to present content that is in image or video format or an audio speaker to present content that is in an audio format.
  • an example system 800 that comprises a node B 802 with a receiver 810 that receives signal(s) from one or more user devices 700 through a plurality of receive antennas 806, and a transmitter 820 that transmits to the one or more user devices 700 through a plurality of transmit antennas 808.
  • Receiver 810 can receive information from receive antennas 806. Symbols may be analyzed by a processor 812 that is similar to the processor described above, and which is coupled to a memory 814 that stores information related to data processing.
  • Processor 812 is further coupled to a random access module 816 that facilitates communications with one or more respective user devices 700 for attempting to facilitate uplink synchronization.
  • random access module 816 may be operable to facilitate network access for one or more UEs.
  • random access module 816 may include node B position information 818.
  • Node B position information 818 may be obtained by the node B 802 using a position sensor based on GPS information, etc.
  • node B position information 818 may be obtained from a network controller, server, etc.
  • node B position information 818 may be broadcast to UEs 700.
  • node B 802 may communicate a system information message to UE 700.
  • the system information message may include node B position information 818.
  • the system information block type 15.5 may include the observed time difference of arrival (OTDOA) assistance data for UE- based information element (IE).
  • This IE may indicate the position information for the node B.
  • degree of latitude and degree of longitude information for the current node B 802 is included.
  • the UE 700 may transmit a synchronization code during an initial access procedure. In another aspect, the UE 700 may transmit a synchronization code during a hard handover procedure. Further, in such an aspect, the node B 802 may bias a response to a UE 700 performing hard handover over a UE 700 performing an initial access procedure.
  • 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil facilitant la synchronisation montante pendant un processus d'accès direct dans un système à accès multiple par répartition de code synchrone et répartition temporelle (TD-SCDMA). Le procédé peut consister à déterminer un retard aller-retour entre un nœud B et un équipement utilisateur (UE) et à ajuster le cadencement de transmission montante sur la base du retard aller-retour déterminé.
PCT/US2010/034531 2009-11-20 2010-05-12 Procédé et appareil facilitant la synchronisation montante WO2011062655A1 (fr)

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CN2010800012564A CN102273284A (zh) 2009-11-20 2010-05-12 用于促进上行链路同步的方法和装置
TW099115708A TW201119454A (en) 2009-11-20 2010-05-17 Method and apparatus for facilitating uplink synchronization

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US26312709P 2009-11-20 2009-11-20
US61/263,127 2009-11-20

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CN106063341A (zh) * 2014-03-06 2016-10-26 华为技术有限公司 一种上行、下行数据发送方法
WO2017095707A1 (fr) * 2015-12-04 2017-06-08 Qualcomm Incorporated Programmation basée sur une limite de retard de bout en bout
WO2022218499A1 (fr) 2021-04-12 2022-10-20 Alphabeta Ab Passage facilité sur la barrière hémato-encéphalique par coadministration d'un domaine de brichos de bri2 et de microbulles et/ou de nanogouttelettes lipidiques
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CN108430064A (zh) * 2017-02-15 2018-08-21 中兴通讯股份有限公司 一种动态小区覆盖的方法、装置和系统

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JP2016523488A (ja) * 2013-06-28 2016-08-08 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． 長距離カバレッジ方法および基地局
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CN106063341B (zh) * 2014-03-06 2019-11-05 华为技术有限公司 一种上行、下行数据发送方法
WO2017095707A1 (fr) * 2015-12-04 2017-06-08 Qualcomm Incorporated Programmation basée sur une limite de retard de bout en bout
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WO2022218499A1 (fr) 2021-04-12 2022-10-20 Alphabeta Ab Passage facilité sur la barrière hémato-encéphalique par coadministration d'un domaine de brichos de bri2 et de microbulles et/ou de nanogouttelettes lipidiques
WO2024079221A1 (fr) 2022-10-12 2024-04-18 Alphabeta Ab Domaine brichos de bri2 pour l'administration de protéines dans des neurones cns

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TW201119454A (en) 2011-06-01

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