WO2009083927A1 - Procédé et système pour un schéma de transmission de séquence d'intervalles de temps de pilote de liaison montante supplémentaire - Google Patents

Procédé et système pour un schéma de transmission de séquence d'intervalles de temps de pilote de liaison montante supplémentaire Download PDF

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Publication number
WO2009083927A1
WO2009083927A1 PCT/IB2008/055546 IB2008055546W WO2009083927A1 WO 2009083927 A1 WO2009083927 A1 WO 2009083927A1 IB 2008055546 W IB2008055546 W IB 2008055546W WO 2009083927 A1 WO2009083927 A1 WO 2009083927A1
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WIPO (PCT)
Prior art keywords
uplink
time slot
uplink pilot
signal
supplemental
Prior art date
Application number
PCT/IB2008/055546
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English (en)
Inventor
Xiaobo Zhang
Ni Ma
Gang Wu
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Nxp B.V.
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Publication date
Application filed by Nxp B.V. filed Critical Nxp B.V.
Publication of WO2009083927A1 publication Critical patent/WO2009083927A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H04L5/0085—Timing of allocation when channel conditions change
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/48—TPC being performed in particular situations during retransmission after error or non-acknowledgment

Definitions

  • the invention relates generally to wireless communications systems, and more particularly, to a transmission scheme which implements a supplemental uplink pilot time slot (UpPTS) sequence.
  • UpPTS uplink pilot time slot
  • the 3 rd Generation Partnership Project (3 GPP) was established to produce globally applicable technical specifications and technical reports for a 3 rd generation mobile system based on evolved Global System for Mobile (GSM) communications core networks and the radio access technologies that they support (i.e., Universal Terrestrial Radio Access (UTRA) in both Frequency Division Duplex (FDD) and Time Division Duplex (TDD) modes).
  • GSM Global System for Mobile
  • UTRA Universal Terrestrial Radio Access
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the scope was subsequently amended to include the maintenance and development of the GSM technical specifications and technical reports including evolved radio access technologies (e.g., General Packet Radio Service (GPRS) and Enhanced Data rates for GSM Evolution (EDGE)).
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data rates for GSM Evolution
  • Fig. 1 illustrates one example of a radio frame used in a conventional time division-synchronous code division multiple access (TD-SCDMA) mobile cellular system.
  • TSs Time Slots
  • Each radio frame is divided into two equal subframes. The length of each subframe is 5ms.
  • In each subframe there are a total seven normal TSs and 3 special TSs.
  • the seven normal TSs are designated as TSO through TS6.
  • TSO and TSl are always designated as downlink and uplink TSs, respectively.
  • the three special TSs include a downlink pilot time slot (DwPTS), an uplink pilot time slot
  • DwPTS downlink pilot time slot
  • the DwPTS is a dedicated downlink pilot TS used for downlink synchronization.
  • the UpPTS is a dedicated uplink pilot TS used for uplink synchronization.
  • the GP separates the DwPTS and the UpPTS.
  • the same radio frame structure is employed in the long term evolution (LTE) time duplex division (TDD) low chip rate (LCR) system.
  • Fig. 2 illustrates exemplary interference which occurs using conventional radio frame transmission schemes.
  • the downlink (DL) transmissions e.g., TSO and DwPTS
  • IRCs interference resource cells
  • the DL (e.g., TSO) and DwPTS signals of adjacent cells cause serious interference to the UL TS of the TC.
  • a transmission from a first IRC i.e., IRCl
  • a transmission from a second IRC i.e., IRC2
  • the DwPTS does interfere with the UpPTS of the TC.
  • a transmission from a third IRC i.e., IRC3 is delayed by a time t3, and both the DwPTS and the TSO interfere with the UpPTS of the TC.
  • UE user equipment
  • UpPCH uplink pilot channel shifting scheme
  • the UpPTS is shifted to another position within the radio subframe so that the downlink transmissions do not interfere with the UpPTS.
  • Fig. 3 illustrates an embodiment of the UpPCH shifting scheme in which the UpPTS is shifted to a position between TSl and TS2 (i.e., to the end of TSl).
  • the UpPCH shifting scheme By shifting the UpPTS to another position within the radio subframe, the interference from adjacent cells is limited or avoided.
  • the UpPCH shifting scheme encounters several serious problems. For example, the UpPCH shifting scheme may suffer from strict detection accuracy, as well as increased control signaling overhead.
  • TDD Frame Structure 2 (FS2) uses the same radio structure, so the interference in UpPTS is also significant.
  • the UpPTS signals will bring interference to TSl.
  • Implementing advanced receiving algorithms could potentially solve this problem.
  • decreasing the number of active UEs during TS 1 could also solve this problem, at least partially.
  • the UpPCH shifting scheme is typically initiated by the base station (BS) when the BS detects that the interference level in UpPTS is too high to accurately receive the UL synchronization signals.
  • the UpPCH shifting scheme can decrease the interference to UpPTS, the UpPCH shifting scheme can also have adverse effects.
  • the UpPCH shifting scheme uses a strict requirement of detection accuracy in the BS site. This stricter detection accuracy relates to detecting the interference level in UpPTS (to decide whether to initiate the UpPCH shifting scheme or not), a longer slip window due to the unfixed position of the UpPTS, or other adverse effects.
  • the UpPCH shifting scheme also introduces implementation complexities to the BS.
  • the UpPCH shifting scheme may increase the burst interference level on TSl, present difficulties in fulfilling this scheme (e.g., the UpPTS can't be shifted to TS2 if TS2 is a DL TS), impact controlled signaling overhead to support the UpPTS position variation, or require significant modifications on existing specifications.
  • the UpPCH shifting scheme is proposed for use in the TD-SCDMA enhancement version standard (CDMA based scheme).
  • CDMA based scheme In the LTE era (OFDM based scheme), TDD Frame Structure 2 (FS2) uses the same radio structure, so the interference in UpPCH will also be significant.
  • a system and method for broadband multi-carrier communications is described.
  • the system includes a base station, a pilot signal transmission scheme manager, and user equipment.
  • the base station detects interference during an uplink pilot time slot of a radio subframe.
  • the uplink pilot time slot is designated for an uplink pilot signal.
  • the pilot signal transmission scheme manager communicates a supplemental uplink pilot signal transmission scheme to the user equipment.
  • the supplemental uplink pilot signal transmission scheme identifies an uplink time slot of the radio subframe.
  • the uplink time slot is designated for an uplink signal.
  • the user equipment transmits a supplemental uplink pilot signal to the base station during the uplink time slot of the radio subframe in response to the interference during the uplink pilot time slot of the radio subframe.
  • Embodiments of this system, and the accompanying method provide an alternative synchronization scheme for both TD-SCDMA and TDD LTE FS2 systems.
  • the UpPTS sequence is sent in one or more normal TSs and/or the original UpPCH positions so as to overcome the interference problems mentioned above.
  • Other embodiments of the system and method are also described.
  • Other aspects and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
  • Fig. 1 illustrates one example of a radio frame used in a conventional time division-synchronous code division multiple access (TD-SCDMA) mobile cellular system.
  • TD-SCDMA time division-synchronous code division multiple access
  • Fig. 2 illustrates exemplary interference which occurs using conventional radio frame transmission schemes.
  • Fig. 3 illustrates an embodiment of the UpPCH shifting scheme in which the UpPTS is shifted to a position between TSl and TS2.
  • Fig. 4 illustrates a schematic block diagram of one embodiment of a wireless communications system that may implement a broadband multi-channel system.
  • Fig. 5 illustrates a schematic block diagram of a more detailed embodiment of the transmission resource manager of the wireless communications system of Fig. 4.
  • Fig. 6 illustrates a schematic block diagram of a more detailed embodiment of the user equipment of the wireless communications system of Fig. 4.
  • Figs. 7A-D illustrate various embodiments of a radio frame with different transmission positions for one or more supplemental UpPTS sequences.
  • Fig. 8 illustrates graphical representation of one embodiment of a transmission power of a supplemental UpPTS sequence relative to a transmission power of a typical UL signal.
  • Fig. 9 illustrates one embodiment of a transmission scheme for a supplemental UpPTS sequence transmitted during an uplink TS.
  • Fig. 10 illustrates one embodiment of a supplemental UpPTS sequence mapping to map the UpPTS sequence transmission to the uplink TS 1.
  • Fig. 11 illustrates a schematic flow chart diagram of one embodiment of a method for transmitting a supplemental UpPTS sequence during an uplink TS.
  • Fig. 12 illustrates a schematic flow chart diagram of one embodiment of a method for initiating a supplemental UpPTS transmission scheme.
  • Fig. 13 illustrates a schematic flow chart diagram of another embodiment of a method for initiating a supplemental UpPTS transmission scheme.
  • Fig. 14 illustrates a schematic flow chart diagram of one embodiment of a method for detecting a supplemental UpPTS sequence.
  • the UpPTS sequence is sent in the normal TSs and/or the original UpPCH positions of the radio sub frame.
  • a supplemental UpPTS sequence (e.g., a duplication or a replacement of the sequence in the normal UpPCH position) can be transmitted in one or more normal TSs.
  • the supplemental UpPTS sequence is transmitted in an extremely low power level, so that it is transparent for the UEs operating in the corresponding TS. Hence, the UpPTS sequence can be disregarded as background noise for these UEs.
  • the supplemental UpPTS sequence may be transmitted redundantly (e.g., repeated transmission using code division multiplex (CDM) or another transmission mode).
  • CDM code division multiplex
  • the supplemental UpPTS sequence may be transmitted in one or more fixed positions within the corresponding TS (or multiple TSs).
  • the supplemental UpPTS sequence may be transmitted to partially or fully fill in all of a particular physical resource (i.e., frequency domain and/or time domain) of the corresponding TS (or multiple TSs).
  • the fixed position is predefined for the BS and the UE.
  • the UpPCH itself may or may not be used to transmit the UpPTS sequence, depending on each implementation of the broadband multi-carrier system. If the UpPCH is not used to transmit the UpPTS sequence, then the UpPCH may be used as another GP (i.e., null signal).
  • embodiments of the broadband multi-carrier communication system and associated methods may use either the BS or the UE to initiate (i.e., trigger) the supplemental UpPTS transmission scheme.
  • the UE By allowing the UE to trigger the supplemental UpPTS transmission scheme, the dependency on detection at the BS may be reduced or eliminated. Additionally, various detection schemes may be implemented.
  • Other embodiments of the broadband multi-carrier communication system and corresponding methods are described in more detail below.
  • Fig. 4 illustrates a schematic block diagram of one embodiment of a wireless communications system 100 that may implement a broadband multi-channel system.
  • the illustrated wireless communications system 100 includes a base station 102, or an evolved Node B (eNB), and multiple mobile stations 104, or user equipment (UE).
  • the wireless communications system 100 may be operated in various modes, including TD- SCDMA and TDD LTE FS2 modes.
  • the eNB 102 includes four antennas 106, although the eNB 102 can include more than four antennas 106.
  • the eNB 102 also includes a transmission resource manager 110.
  • the eNB 102 is responsible for managing transmission resources of the wireless communications system 100.
  • One example of the transmission resource manager 110 is shown in Fig. 5 and described in more detail below.
  • the UEs 104 are wireless communications mobile stations that support wireless operation as specified in the 3GPP LTE specification.
  • the UEs 104 may have one or two antennas 108, although the UEs 104 are not limited to two antennas 108 (e.g., the UEs 104 can include more than two antennas 108).
  • Other embodiments of the wireless communications system 100 may implement other wireless schemes for broadband multi-carrier systems such as WiMAX.
  • the DwPTS and UpPTS of a radio sub frame are used to synchronize the communications between the eNB 102 and the UEs 104.
  • data may be transmitted between the eNB 102 and the synchronized UE 104. Since the synchronization process may be disrupted by interfering signals (e.g., a DwPTS signal from an adjacent cell may interfere with an UpPTS sequence of a target cell), some embodiments provide alternative UpPTS transmission schemes to improve the transmission and detection of synchronization signals.
  • the eNB 102 detects interference during an UpPTS of a radio subframe.
  • the UpPTS is designated for an uplink pilot signal.
  • the user equipment transmits a supplemental uplink pilot signal to the eNB 102 during one or more UL TSs of the radio subframe in response to interference during the UpPTS of the radio subframe.
  • Fig. 5 illustrates a schematic block diagram of a more detailed embodiment of the transmission resource manager 110 of the wireless communications system 100 of Fig. 4.
  • the depicted transmission resource manager 110 includes several functional blocks described herein, other embodiments of the transmission resource manager 110 may include fewer or more functional blocks to implement more or less functionality.
  • the illustrated transmission resource manager 110 includes a resource block manager 112, an antenna manager 114, a transmission scheme manager 116, and a synchronization manager 118.
  • the transmission scheme manager 110 is coupled to the eNB 102.
  • the transmission resource manager 110 facilitates allocation of a radio resource to the UE 104 to enable communications between the eNB 102 and the UE 104.
  • the resource block manager 112 is responsible for identifying resources, or resource blocks, that are available for baseband transmission.
  • the resource block manager 112 identifies at least one available frequency range within an available frequency band. Resources, or resource blocks, may refer to frequency blocks in the frequency domain and/or time blocks in the time domain.
  • the antenna manager 114 is responsible for identifying antennas 106 of the eNB 102 that are available for baseband transmissions. Among other things, the antennas 106 transmit data and synchronization signals to one or more UEs 104. The antennas 106 also receive data and synchronization signals from one or more UEs 104.
  • the transmission scheme manager 116 is responsible for establishing a transmission scheme for the UEs 104. The transmission scheme defines both the allocation of available resources, or resource blocks, and the selection of available antennas 106 amongst the UEs 104. More specifically, the transmission scheme manager 116 facilitates allocation of radio resources to the UEs 104, for example, based on channel status feedback from each of the UEs 104.
  • the synchronization manager 118 is responsible for managing the synchronization between the eNB 102 and one or more UEs 104.
  • the illustrated synchronization manager 118 includes a downlink controller 120, an uplink controller 122, an interference monitor 124, a window controller 126, a feedback generator 128, and a pilot signal transmission scheme manager 130.
  • Other embodiments of the synchronization manager 118 may include fewer or more functional components.
  • the downlink controller 120 receives downlink communications from one or more UEs 104.
  • the uplink controller 122 transmits uplink communications to one or more UEs 104.
  • the downlink and uplink communications may include downlink and uplink synchronization information, including commands, requests, feedback, and other information.
  • the interference monitor 124 monitors the UpPTS of the radio sub frame to determine the presence of interference during the UpPTS of the radio subframe. If sufficient interference is detected, then the pilot signal transmission scheme manager 130 is configured to communicate the supplemental uplink pilot signal transmission scheme to the corresponding UE 104 in response to the presence of the interference during the UpPTS of the radio subframe.
  • the window controller 126 establishes a detection window for the eNB 102.
  • the eNB 102 uses the detection window to monitor at specific times for a synchronization signal such as the DwPTS signal from one or more UEs 104.
  • a synchronization signal such as the DwPTS signal from one or more UEs 104.
  • the detection window corresponds to at least a portion of an uplink TS.
  • a boundary of the detection window potentially may coincide with a boundary between TSs.
  • the feedback generator 138 generates a feedback signal for transmission to a corresponding UE 104 in response to receipt of the uplink pilot signal from the UE 104 during the UpPTS. As explained in more detail below, this feedback signal, or the absence of an anticipated feedback signal, may be used by the UE 104 to initiate a supplemental pilot signal transmission scheme.
  • the pilot signal transmission scheme manager 130 communicates a supplemental uplink pilot signal transmission scheme to one or more UEs 104.
  • the supplemental uplink pilot signal transmission scheme identifies an uplink TS of the radio subframe.
  • the uplink time slot is designated for an uplink signal.
  • Fig. 6 illustrates a schematic block diagram of a more detailed embodiment of the UE 104 of the wireless communications system 100 of Fig. 4.
  • the UE 104 is configured to transmit a supplemental uplink pilot signal to the eNB 102 during an uplink TS of a radio subframe.
  • the UE 104 transmits the supplemental uplink pilot signal in response to interference during the UpPTS of the radio subframe.
  • the depicted UE 104 includes several functional blocks described herein, other embodiments of the UE 104 may include fewer or more functional blocks to implement more or less functionality.
  • the illustrated UE 104 includes a downlink receiver 132, an uplink transmitter 134, a redundancy engine 136, and a feedback monitor 138.
  • the downlink receiver 132 receives data, synchronization signals, and other information from the eNB 102.
  • the uplink transmitter 134 transmits data, synchronization signals, and other information from the UE 104 to the eNB 102.
  • the uplink transmitter 134 is configured to transmit an uplink pilot signal to the eNB 102 during an UpPTS of a radio subframe. However, if interference is detected during the UpPTS, then one or more instances of the UpPTS sequence may be transmitted during another portion of the radio subframe. As one example, the UpPTS sequence may be transmitted during all or part of a normal uplink TS (e.g., TS 1).
  • a normal uplink TS e.g., TS 1
  • the uplink transmitter 134 may transmit the supplemental uplink pilot signal at a substantially lower power level than a power level for the uplink signal that is normally transmitted during the normal uplink TS.
  • the supplemental UpPTS sequence can achieve the same bit error rate (BER) with a - (l01og 10 M ⁇ ii? lower power compared with a normal UpPTS sequence (assuming the supplemental UpPTS is repeated M times more than the normal UpPTS sequence).
  • the typical value of the supplemental UpPTS sequence is lower (e.g., -5dB) than the data transmitted in the corresponding UL slot, so the supplemental UpPTS sequence could be regarded as background noise considering the spread spectrum gain of TD-SCDMA.
  • the redundancy engine 136 facilitates transmission of a redundant copy of the supplemental uplink pilot signal during a radio sub frame.
  • the redundant supplemental uplink pilot signal is transmitted during a detection window established by the window controller 126 of the synchronization manager 118 described above.
  • the detection window includes at least a portion of an uplink TS, but also may include the normal UpPCH and/or all or part of multiple normal TSs.
  • the feedback monitor 138 is coupled to the uplink transmitter 134 to monitor for a feedback signal from the eNB 102.
  • the feedback generator 128 of the synchronization manager 118 facilitates generation of a feedback signal in response to transmission of the uplink pilot signal to the eNB 102 during the UpPTS.
  • the UE 104 determines that there is too much interference during the normal UpPTS. In this way, the UE 104 may initiate a supplemental uplink pilot signal transmission scheme based on the determination that there is too much interference during the normal UpPTS.
  • the uplink transmitter 134 may transmit a supplemental uplink pilot signal to the eNB 102 during a normal uplink TS in response to an absence of a feedback signal from the eNB 102.
  • Figs. 7A-D illustrate various embodiments of a radio frame with different transmission positions for one or more supplemental UpPTS sequences.
  • the transmission positions shown in Figs. 7A-D and described below correlate to embodiments of the detection window established by the window controller 126 of the synchronization manager 118.
  • the window controller 126 determines the position and duration of the detection window and communicates the detection window information to the UE 104 so that the uplink transmitter 134 of the UE 104 can transmit one or more UpPTS sequences during the specified detection window.
  • the UE 104 determines the position and/or duration of the detection window and communicates the detection window information to the eNB 102 so that the eNB 102 can monitor for the UpPTS sequence during the specified detection window.
  • the detection window (designated as
  • Ll is aligned with the position and duration of TSl. This allows the UE 104 to transmit one or more UpPTS sequences anytime during TSl. In some embodiments, redundant instances of the UpPTS sequence are transmitted at relatively low power levels in order to provide more accurate data transmissions without significantly interfering with the normal uplink data transmitted during TS 1.
  • Fig. 7B illustrates a detection window (designated as L2), and a corresponding transmission position, which spans only a portion of TS 1. In particular, the illustrated detection window begins at a time after TS 1 begins and ends prior to the end of TSl.
  • This example illustrates that the detection window and/or the transmission positions of the UpPTS sequence do not necessarily coincide with the transitions between adjacent TSs. Rather, the detection window and/or the transmission positions of the UpPTS sequence may begin or end in the middle of any of the uplink TSs.
  • the detection window (designated as L3) is aligned with the combination of the normal UpPTS and TS 1.
  • one or more instances of the UpPTS sequence may be transmitted during TSl, in addition to transmitting the UpPTS sequence during the normal UpPTS.
  • Fig. 7D illustrates another embodiment in which the detection window (designated as L4) is aligned with the combination of multiple TSs.
  • the detection window is shown as being aligned with three TSs (i.e., TS1-TS3), other embodiments may establish the detection window and/or the transmission positions of the UpPTS sequence with all or part of a different number of TSs.
  • the UpPTS sequence may be transmitted during the normal UpPTS, in addition to during multiple normal TSs.
  • Figs. 7A-D illustrate specific exemplary embodiments, other embodiments also may be implemented to establish various detection windows and/or transmission positions. In fact, some embodiments may designate non-contiguous detection windows and/or transmission periods within a single radio sub frame.
  • Fig. 8 illustrates a graphical representation 147 of one embodiment of a transmission power of a supplemental UpPTS sequence relative to a transmission power of a typical UL signal.
  • the supplemental UpPTS sequence may be transmitted in an extremely low power level during normal TSs so that the UpPTS sequence is transparent for the UEs 104 under TSl . This allows the UpPTS sequence to be disregarded as background noise, in at least some embodiments.
  • Fig. 9 illustrates one embodiment of a transmission scheme 148 for a supplemental UpPTS sequence transmitted during an uplink TS.
  • the supplemental UpPTS sequence may be redundantly spread over the detection window (e.g., during TSl).
  • an UpPTS sequence :
  • $1 ⁇ S l ⁇ > S 2 ⁇ > " " " " S N ) may be processed in combination with a spread spectrum sequence: C ⁇ ⁇ c ⁇ ,c 2 , - - -c M )
  • radio resource elements can be mapped onto radio resource elements, as
  • Fig. 10 illustrates one embodiment of a supplemental UpPTS sequence mapping 149 to map the UpPTS sequence transmission to the uplink TSl .
  • the position of the supplemental UpPTS sequence is predefined so that the UpPTS is transmitted in a fixed position. Transmitting the UpPTS in a fixed position may save control signaling overhead. Additionally, having one or more predefined positions enables the UE 104 to trigger the supplemental UpPTS transmission scheme when the eNB 102 cannot accurately initiate the supplemental UpPTS transmission scheme.
  • the supplemental UpPTS sequence may keep away from the reference signals in the normal TSs so that the performance of channel estimation is not altered or influenced.
  • a TD-SCDMA implementation uses a TD-SCDMA implementation as an example, the positioning shown in the supplemental UpPTS sequence mapping 149 includes two data and UpPTS sequence positions separated by a midamble. Other embodiments may use other positions.
  • Fig. 11 illustrates a schematic flow chart diagram of one embodiment of a method 150 for transmitting a supplemental UpPTS sequence during an uplink TS. Although the transmission method 150 of Fig. 11 is described in relation to the wireless communications system 100 of Fig. 1, other embodiments may be implemented in conjunction with other wireless communication systems.
  • the eNB 102 determines a presence of interference during the normal UpPTS.
  • the UpPTS is normally designated for an uplink pilot signal.
  • Fig. 12 A more detailed embodiment of how the eNB 102 determines if there is interference during the normal UpPTS is shown in Fig. 12 and described in more detail below.
  • the UE 102 determines if there is interference during the normal UpPTS. Additional details of this latter embodiment, in which the UE 102 determines if there is interference during the normal UpPTS, are shown in Fig. 13 and described in more detail below.
  • a normal uplink TS is identified.
  • the uplink TS is normally designated for transmission of an uplink data signal.
  • the UE transmits a supplemental uplink pilot signal, or a supplemental UpPTS sequence, during the identified uplink TS.
  • the UE 104 transmits the supplemental UpPTS sequence during the uplink TS in response the interference during the UpPTS of the radio sub frame.
  • the depicted transmission method 150 then ends.
  • the transmission method 150 may include other operations related to synchronization of the eNB 102 and the UE 104 within the wireless communications system 100.
  • some embodiments of the transmission method 150 include transmitting the supplemental UpPTS sequence concurrently with transmission of an uplink signal during the uplink TS.
  • the supplemental UpPTS sequence may be transmitted at a substantially lower power level than a power level of the uplink signal.
  • the transmission method 150 includes transmitting a redundant copy of the supplemental UpPTS sequence within the radio sub frame, for example, during the normal UpPTS.
  • the transmission method 150 includes transmitting the supplemental UpPTS sequence during a detection window which includes at least a portion of the designated uplink TS. Examples of some detection windows, L1-L4, are shown in Figs. 7A-D and described in more detail above.
  • the transmission method 150 includes identifying a level of interference during at least a portion of the uplink time slot, determining a time period during which the level of interference exceeds an interference threshold, and determining the duration of the detection window based on the level of interference during the uplink time slot. In this way, the duration of the detection window may be exclusive of the time period during which the level of interference exceeds the interference threshold.
  • the transmission method 150 includes transmitting the supplemental UpPTS sequence at a fixed position within the uplink TS. In another embodiment, the transmission method 150 includes monitoring the UpPTS of the radio sub frame to determine the presence of the interference during the UpPTS of the radio sub frame and triggering transmission of the supplemental UpPTS sequence during the uplink TS of the radio sub frame in response to a determination that the interference during the UpPTS exceeds a trigger threshold (designated as v 2 ). In another embodiment, the transmission method 150 includes monitoring for the supplemental UpPTS sequence during an uplink TS of the radio sub frame in response to a determination that the interference during the UpPTS exceeds a monitoring threshold (designated as V 1 ).
  • the interference threshold is less than the trigger threshold (i.e., V 1 ⁇ V 2 ).
  • the interference threshold may be less than or equal to the trigger threshold (i.e., V 1 ⁇ V 2 ).
  • the transmission method 150 includes monitoring at the UE 104 for a feedback signal from the eNB 102 in response to transmission of the UpPTS sequence from the UE 104 to the eNB 102 during the UpPTS. If a feedback signal is not received at the UE 104, then the UE 104 recognizes an absence of the feedback signal at the UE 104 and determines that interference is present during the UpPTS of the radio sub frame based on the absence of the feedback signal at the UE 104. Subsequently, the UE 104 initiates transmission of the supplemental UpPTS sequence during the uplink TS of the radio subframe in response to the absence of the feedback signal at the UE 104.
  • the transmission method 150 includes performing channel estimation to estimate a channel impulse response, detecting the uplink signal within a signal received during the uplink TS, and justifying the uplink signal detected within the received signal. The eNB 102 then multiplies the justified uplink signal and the estimated channel impulse response to recover an influence of the uplink signal. This influence is then removed from the signal received during the uplink TS, so that the supplemental UpPTS sequence within the received signal may be detected and justified.
  • the transmission method 150 includes calculating an influence of the supplemental UpPTS sequence detected within the received signal and removing the influence of the supplemental UpPTS sequence from the signal received during the uplink TS. This process may be iterated two or more times in order to improve the accuracy of detection of the supplemental UpPTS sequence.
  • Fig. 12 illustrates a schematic flow chart diagram of one embodiment of a method 160 for initiating a supplemental UpPTS transmission scheme.
  • the initiation method 160 relates to initiation of the supplemental UpPTS transmission scheme by the eNB 102.
  • the initiation method 160 of Fig. 12 is described in relation to the wireless communications system 100 of Fig. 1, other embodiments may be implemented in conjunction with other wireless communication systems.
  • the eNB 102 sets two predefined threshold values: the interference threshold, V 1 , and the trigger threshold, v 2 , which are described above. In some embodiments, the interference threshold is less than (or equal to) the trigger threshold.
  • the eNB 102 monitors the noise level in the UpPTS.
  • the eNB 102 determines, at block 164, if the background noise during the UpPTS exceeds the trigger threshold, v 2 . If the background noise during the UpPTS exceeds the trigger threshold, v 2 , then at block 166 the eNB 102 notifies the UE 104 to start the supplemental UpPTS transmission scheme. If the background noise during the UpPTS does not exceed the trigger threshold, v 2 , then the eNB 102 determines at block 168 if the background noise during the UpPTS exceeds the interference threshold, V 1 . If the background noise during the UpPTS does not exceed the interference threshold, V 1 , then at block 170 the eNB 102 continues to monitor for the normal UpPTS sequence on the normal UpPTS.
  • the eNB 102 begins to monitor for a supplemental UpPTS sequence on the normal uplink TS, rather than (or in addition to) the on the normal UpPTS.
  • the eNB 102 determines if the UpPTS is detected. If the UpPTS is not detected, then the eNB 102 continues to monitor the noise levels during the normal UpPTS, as described above. Alternatively, if the UpPTS is detected, then at block 176 the eNB 102 sends a downlink feedback signal to the UE 104. In one embodiment, the downlink feedback signal request the UE 104 to adjust the transmission power and/or time of the UpPTS sequence. In another embodiment, the downlink feedback signal may forego requesting adjustments to the transmission power and time of the UpPTS sequence.
  • Fig. 13 illustrates a schematic flow chart diagram of another embodiment of a method 180 for initiating a supplemental UpPTS transmission scheme.
  • the initiation method 180 relates to initiation of the supplemental UpPTS transmission scheme by the UE 104.
  • the supplemental UpPTS transmission scheme may be triggered by either the eNB 102 (as shown in Fig. 12) or the UE 104 (as shown in Fig. 13).
  • the ability of the UE 104 to initiate embodiments of the supplemental UpPTS transmission scheme reduces the dependency on detection by the eNB 102.
  • the initiation method 180 of Fig. 13 is described in relation to the wireless communications system 100 of Fig. 1, other embodiments may be implemented in conjunction with other wireless communication systems.
  • the UE 104 may be configured to initiate the supplemental UpPTS transmission scheme if the UE 104 does not receive a feedback signal from the eNB 102 after sending a normal UpPTS sequence to the eNB 102 a specified number of times (e.g., one or more).
  • the UE 104 achieves downlink synchronization with the eNB 102.
  • the UE 104 sends a normal UpPTS sequence to the eNB 102 through the normal UpPTS.
  • the UE 104 determines if a downlink feedback signal from the eNB 102 is detected.
  • the feedback generator 128 of the eNB 102 is configured to generate the downlink feedback signal
  • the feedback monitor 138 of the UE 104 is configured to monitor for the downlink feedback signal from the eNB 102. If the UE 104 detects a downlink feedback signal, then at block 188 the UE sends the uplink data to the eNB 102 after adjusting the transmission power and time, if such adjustments are requested by the eNB 102. The UE 104 then continues to operate by sending the UpPTS sequence through the normal UpPTS. Otherwise, if the UE 104 does not detect an anticipated downlink feedback signal, then at block 190 the UE 104 determines if the eNB 102 has requested a supplemental UpPTS sequence.
  • the UE 104 continues to resend the UpPTS sequence until at block 194 a retry time period expires or, alternatively, a number of retry attempts are exhausted. If the retry time period expires, or if the UE 104 receives a supplemental UpPTS request from the eNB 102, then at block 192 the UE 104 sends a supplemental UpPTS sequence to the eNB 102 on a normal TS. The depicted initiation method 180 then continues as shown. In some embodiments, the UE 104 may attempt, at some point, to return to normal UpPTS transmission on the normal UpPTS.
  • Fig. 14 illustrates a schematic flow chart diagram of one embodiment of a method 200 for detecting a supplemental UpPTS sequence. Although the detection method 200 of Fig. 14 is described in relation to the wireless communications system 100 of Fig. 1, other embodiments may be implemented in conjunction with other wireless communication systems.
  • the eNB 102 can first detect and justify the normal signals and then attempt to acquire the UpPTS sequence. After that, the eNB 102 performs supplemental UpPTS sequence detection. In some embodiments, an iterative process (i.e., the BS detects the supplement UpPTS sequence and re-justifies the normal signals) could be conducted to achieve improved performance. In addition, the eNB 102 can determine the detection window length according to the practical interference status so as to avoid the time interval with the most serious interference. At block 202, the eNB 102 performs channel estimation on the normal TSs to get the channel impulse response.
  • BER bit error rate
  • the eNB 102 detects and justifies the normal signals on the normal TSs. Then, at block 206, the eNB 102 determines a length of the detection window, according to the interference power level that is detected. Using this information, at block 208 the eNB 102 recovers the influence of the normal signals and, at block 210, removes the influence of the normal signals from the received signals.
  • the eNB 102 detects and justifies the supplemental UpPTS sequence. Additionally, in some embodiments, at block 214 the eNB 102 may remove the influence of the supplemental UpPTS sequence from the received signals in order to iteratively perform the indicated operation so that the signals may be detected with greater accuracy. The depicted detection method 200 then ends.

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

Abstract

L'invention porte sur un système et un procédé pour des communications multi-porteuses en bande large. Le système comprend une station de base, un gestionnaire de schéma de transmission de signal pilote et un équipement utilisateur. La station de base détecte un brouillage durant un intervalle de temps de pilote de liaison montante d'une sous-trame radio. L'intervalle de temps de pilote de liaison montante est désigné pour un signal pilote de liaison montante. Le gestionnaire de schéma de transmission de signal pilote communique un schéma de transmission de signal pilote de liaison montante supplémentaire à l'équipement utilisateur. Le schéma de transmission de signal pilote de liaison montante supplémentaire identifie un intervalle de temps de liaison montante de la sous-trame radio. L'intervalle de temps de liaison montante est désigné pour un signal de liaison montante. L'équipement utilisateur transmet un signal pilote de liaison montante supplémentaire à la station de base durant l'intervalle de temps de liaison montante de la sous-trame radio en réponse au brouillage durant l'intervalle de temps de pilote de liaison montante de la sous-trame radio.
PCT/IB2008/055546 2008-01-02 2008-12-26 Procédé et système pour un schéma de transmission de séquence d'intervalles de temps de pilote de liaison montante supplémentaire WO2009083927A1 (fr)

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EP2464159A4 (fr) * 2009-08-06 2016-10-12 China Academy Of Telecomm Tech Procédé, système et dispositif de compte-rendu d'une interférence de pilote de liaison montante
US10117262B2 (en) 2009-08-06 2018-10-30 China Academy Of Telecommunications Technology Method, system and device for reporting uplink pilot interference
WO2011020426A1 (fr) * 2009-08-17 2011-02-24 中兴通讯股份有限公司 Procédé et système de synchronisation de signaux sens montant
CN101998614A (zh) * 2009-08-17 2011-03-30 中兴通讯股份有限公司 一种上行信号同步的方法及系统
CN101998614B (zh) * 2009-08-17 2015-07-22 中兴通讯股份有限公司 一种上行信号同步的方法及系统
CN102316574A (zh) * 2010-06-30 2012-01-11 重庆重邮信科通信技术有限公司 一种多模终端系统时钟定时方法及装置
CN102316574B (zh) * 2010-06-30 2016-08-03 重庆重邮信科通信技术有限公司 一种多模终端系统时钟定时方法及装置
EP2700279A1 (fr) * 2011-04-21 2014-02-26 Renesas Mobile Corporation Prévention des erreurs dans les changements de configuration de liaison montante/liaison descendante dynamiques pour le duplexage par répartition dans le temps
EP2700279A4 (fr) * 2011-04-21 2014-10-29 Broadcom Corp Prévention des erreurs dans les changements de configuration de liaison montante/liaison descendante dynamiques pour le duplexage par répartition dans le temps
US8873435B2 (en) 2012-02-02 2014-10-28 Qualcomm Incorporated Short random access channel (RACH) disabling in TDD-LTE
EP2852206A4 (fr) * 2012-05-16 2015-05-20 Huawei Tech Co Ltd Procédé et noeud d'interception
US10594466B2 (en) 2012-05-16 2020-03-17 Huawei Technologies Co., Ltd. Method and node for listening
US9680625B2 (en) 2012-05-16 2017-06-13 Huawei Technologies Co., Ltd. Method and node for listening
WO2014044227A1 (fr) * 2012-09-24 2014-03-27 中兴通讯股份有限公司 Station de base et procédé de coordination d'interférences de créneau temporel croisées pour station de base en mode commun
CN103687014A (zh) * 2012-09-24 2014-03-26 中兴通讯股份有限公司 一种用于共模基站的交叉时隙干扰协调方法及基站
CN103687014B (zh) * 2012-09-24 2016-12-21 中兴通讯股份有限公司 一种用于共模基站的交叉时隙干扰协调方法及基站
WO2015106279A3 (fr) * 2014-01-13 2015-08-27 Qualcomm Incorporated Positionnement de canal pilote de liaison montante pour repli automatique à commutation de circuit
EP4325788A3 (fr) * 2014-08-22 2024-05-29 ZTE Corporation Procédé de traitement de signal, station de base et terminal
CN105208662A (zh) * 2015-08-31 2015-12-30 宇龙计算机通信科技(深圳)有限公司 D2d通信方法、用户设备及基站
CN105188020B (zh) * 2015-08-31 2019-01-11 宇龙计算机通信科技(深圳)有限公司 D2d通信方法、用户设备及基站
WO2017035939A1 (fr) * 2015-08-31 2017-03-09 宇龙计算机通信科技(深圳)有限公司 Procédé de communication d2d, équipement d'utilisateur et station de base
CN105188020A (zh) * 2015-08-31 2015-12-23 宇龙计算机通信科技(深圳)有限公司 D2d通信方法、用户设备及基站
WO2018081916A1 (fr) * 2016-11-01 2018-05-11 达闼科技（北京）有限公司 Procédé d'attribution de ressources, système d'attribution, produit programme d'ordinateur, et dispositif de communications
US10880751B2 (en) 2016-11-01 2020-12-29 Cloudminds (Beijing) Technologies Co., Ltd. Resource allocation method, computer program product and communication device
WO2019141101A1 (fr) * 2018-01-17 2019-07-25 华为技术有限公司 Dispositif et procédé d'accès aléatoire
US11601982B2 (en) 2018-01-17 2023-03-07 Huawei Technologies Co., Ltd. Random access method and apparatus
US11974313B2 (en) 2019-10-31 2024-04-30 Google Llc Using a supplementary uplink to mitigate a desensitization condition

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