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WO2012027887A1 - Réalisation d'accès aléatoires sur des porteuses composantes de liaison montante - Google Patents

Réalisation d'accès aléatoires sur des porteuses composantes de liaison montante Download PDF

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Publication number
WO2012027887A1
WO2012027887A1 PCT/CN2010/076490 CN2010076490W WO2012027887A1 WO 2012027887 A1 WO2012027887 A1 WO 2012027887A1 CN 2010076490 W CN2010076490 W CN 2010076490W WO 2012027887 A1 WO2012027887 A1 WO 2012027887A1
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WIPO (PCT)
Prior art keywords
random access
component carriers
uplink component
parallel
signaling message
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2010/076490
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English (en)
Inventor
Wei Bai
Haiming Wang
Jing HAN
Wei Hong
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Nokia Inc
Original Assignee
Nokia Inc
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Publication date
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Priority to PCT/CN2010/076490 priority Critical patent/WO2012027887A1/fr
Publication of WO2012027887A1 publication Critical patent/WO2012027887A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/04—Scheduled access
    • H04W74/06—Scheduled access using polling
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
    • 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
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • 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
    • H04L5/0087—Timing of allocation when data requirements change
    • H04L5/0089—Timing of allocation when data requirements change due to addition or removal of users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0838—Random access procedures, e.g. with 4-step access using contention-free random access [CFRA]
    • 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
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal

Definitions

  • Embodiments of the present invention generally relate to carrier aggregation technology in a cellular network, such as a long-term evolution advanced (LTE-A) network as specified by the 3rd Generation Partnership Project (3 GPP). More particularly, embodiments of the present invention relate to methods, apparatuses, and computer program products for performing random accesses on uplink component carriers.
  • LTE-A long-term evolution advanced
  • 3 GPP 3rd Generation Partnership Project
  • the LTE-A network aims at providing significantly enhanced services at a higher data rate and lower latency with reduced cost.
  • CA is one of the key technologies that may greatly improve data rate.
  • a LTE-A enabled UE configured with the CA it is likely to have a good link condition and transmit larger data amount.
  • LTE Rel-10 the 3GPP has reached an agreement that there will only be intra-band CA for the UL and one TA for all the UL CCs and a random access will only be implemented on Pcell. For a better understanding of such a random access, a discussion will be made as below in connection with Fig. 1.
  • Fig. 1 is a process flow diagram illustrating that the e-NB triggers the
  • the e-NB transmits RACH resource assignment (Message 0, also referred to as MsgO for short) to the UE.
  • the MsgO may be either a PDCCH order or a handover command, and it may include information regarding random access preamble index and PRACH index.
  • the PDCCH order addressed to a C-RNTI would be regarded as a random access order if it has bit features as below:
  • PRACH mask index 4 bits
  • the UE Upon receipt of the MsgO for a contention-free random access from the e-NB, at step SI 02, the UE should transmit a dedicated random access preamble (Message 1, also referred to as Msgl for short) to the e-NB according to the preamble index (i.e., preamble identifier) and PRACH mask index indicated by the PDCCH order or the handover command. Subsequent to sending the dedicated preamble, the UE should monitor a RAR (Message 2, also referred to as Msg2 for short) within a time window.
  • Msgl dedicated random access preamble
  • the UE If, at step SI 03, the UE successfully receives the Msg2 , then it will check whether there exits its own RAPID in the MAC subheader of a MAC RAR PDU as illustrated in Fig. 2. If there is a same RAPID as the one that the UE has transmitted, the UE would consider that the random access is successful this time.
  • the RAR as received by the UE is illustrated in Fig. 2.
  • a plurality of E/T RAPID subheaders are included in a MAC header field of the MAC RAR PDU.
  • the UE checks and finds out that the RAPID in the E/T RAPID subheader 2 is the same as its own RAPID, then it will consider the MAC RAR 2, corresponding to the E/T RAPID subheader 2, in a MAC payload field of the MAC RAR PDU as its own RAR.
  • one TA for the UE can be obtained through the MAC RAR2.
  • the e-NB configures a plurality of UL CCs to one UE and the plurality of UL CCs belong to at least two TA groups, it would be necessary to perform multiple random accesses for measuring the different TAs on the plurality of UL CCs.
  • some companies allegedly support a solution that makes the e-NB trigger the random access for each TA group sequentially by the PDCCH order, in other words, repeating the foregoing process several times on each TA group basis.
  • This solution might be the most straightforward and simplest. For example, it could be operated by the e-NB and have less impact on the current specification.
  • the solution might cause a large delay, especially when the number of newly configured UL CCs is large (e.g., three or four UL CCs with different TAs would be configured). Further, it would cause some PDCCH overhead and increase complexity of blind detection.
  • One embodiment of the present invention provides a method.
  • the method comprises transmitting to a user equipment a single signaling message for triggering parallel contention-free random accesses on a plurality of uplink component carriers so as to measure timing advances.
  • the method also comprises receiving, from the user equipment, a plurality of parallel preambles on the plurality of uplink component carriers.
  • the method comprises transmitting one media access control random access response packet data unit which multiplexes one or more random access responses for the plurality of parallel preambles from the user equipment.
  • the method may further comprise transmitting the single signaling message addressed to a cell radio network temporary identifier of the user equipment on a physical downlink control channel and wherein the single signaling message has one of two following formats:
  • Random access channel category 1 bit, set to "1" for the plurality of uplink component carriers which need new timing advances and "0" for a system information block 2 linked component carrier;
  • Preamble index 6 bits
  • the method comprises configuring a timer for the user equipment so that if none of the single signaling message is received on the physical downlink control channel by the user equipment upon expiration of the timer, contention based random accesses are initiated on the plurality of uplink component carriers by the user equipment.
  • the single signaling message comprises information regarding a preamble index, a physical random access channel mask index, and configuration of the plurality of uplink component carriers.
  • a padding field of the media access control random access response packet data unit comprises a bitmap for indicating that to which one of the plurality of uplink component carriers each random access response belongs.
  • a media access control random access response field of the media access control random access response packet data unit corresponding to a preamble identifier of the plurality of parallel preambles comprises the one or moTe random access responses directed to one or more of the plurality of uplink component carriers and a bitmap being used for indicating the one or more of the plurality of component carriers.
  • the one or more random access responses comprise timing advances with respect to one or more of the plurality of uplink component carriers.
  • Another embodiment of the present invention provides a method.
  • the method comprises receiving, from an evolved Node B, a single signaling message for initiating parallel contention-free random accesses on a plurality of uplink component carriers so as to measure timing advances.
  • the method also comprises transmitting, to the evolved Node B, a plurality of parallel preambles on the plurality of uplink component carriers.
  • the method comprises receiving, from the evolved Node B, one media access control random access response packet data unit which multiplexes one or more random access responses for the plurality of parallel preambles.
  • the method may further comprise receiving the single signaling message on a physical downlink control channel based upon a cell radio network temporary identifier and wherein the single signaling message has one of two following formats:
  • Random access channel category 1 bit, set to "1" for the plurality of uplink component carriers which need new timing advances and "0" for a system information block 2 linked component carrier;
  • Preamble index 6 bits
  • the method comprises operating a timer configured by the evolved Node B, so that if none of the single signaling message is received on the physical downlink control channel upon expiration of the timer, contention based random accesses are initiated on the plurality of uplink component carriers.
  • the single signaling message comprises information regarding a preamble index, a physical random access channel mask index, and configuration of the plurality of uplink component carriers.
  • a padding field of the media access control random access response packet data unit comprises a bitmap for indicating to which one of the plurality of uplink component carriers each random access response belongs.
  • a media access control random access response field of the media access control random access response packet data unit corresponding to a preamble identifier of the plurality of parallel preambles comprises the one or more random access responses directed to one or more of the plurality of uplink component carriers and a bitmap being used for indicating the one or more of the plurality of component carriers.
  • the one or more random access responses comprise timing advances with respect to one or more of the plurality of uplink component carriers.
  • One embodiment of the present invention provides an apparatus.
  • the apparatus comprises means for transmitting to a user equipment a single signaling message for triggering parallel contention-free random accesses on a plurality of uplink component carriers so as to measure timing advances.
  • the apparatus also comprises means for receiving, from the user equipment, a plurality of parallel preambles on the plurality of uplink component carriers.
  • the apparatus comprises means for transmitting one media access control random access response packet data unit which multiplexes one or more random access responses for the plurality of parallel preambles from the user equipment.
  • Another embodiment of the present invention provides an apparatus.
  • the apparatus comprises means for receiving, from an evolved Node B, a single signaling message for initiating parallel contention-free random accesses on a plurality of uplink component carriers so as to measure timing advances.
  • the apparatus also comprises means for transmitting, to the evolved Node B, a plurality of parallel preambles on the plurality of uplink component carriers.
  • the apparatus comprises means for receiving, from the evolved Node B, one media access control random access response packet data unit which multiplexes one or more random access responses for the plurality of parallel preambles.
  • the apparatus comprises a user equipment.
  • An additional embodiment of the present invention provides an apparatus.
  • the apparatus comprises at least one processor, and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to at least perform transmitting to a user equipment a single signaling message for triggering parallel contention-free random accesses on a plurality of uplink component carriers so as to measure timing advances; receiving, from the user equipment, a plurality of parallel preambles on the plurality of uplink component carriers; and transmitting one media access control random access response packet data unit which multiplexes one or more random access responses for the plurality of parallel preambles from the user equipment.
  • the apparatus comprises at least one processor, and at least one memory including compute program code, the at least one memory and the computer program code configured to, with the at least one processor, .cause the apparatus to at least perform receiving, from an evolved Node B, a single signaling message for initiating parallel contention-free random accesses on a plurality of uplink component carriers so as to measure timing advances; transmitting, to the evolved Node B, a plurality of parallel preambles on the plurality of uplink component carriers; and receiving, from the evolved Node B, one media access control random access response packet data unit which multiplexes one or more random access responses for the plurality of parallel preambles.
  • the computer program product comprises at least one computer readable storage medium having a computer readable program code portion stored thereon.
  • the computer readable program code portion comprises program code instructions for transmitting to a user equipment a single signaling message for triggering parallel contention-free random accesses on a plurality of uplink component carriers so as to measure timing advances.
  • the computer readable program code portion further comprises program code instructions for receiving, from the user equipment, a plurality of parallel preambles on the plurality of uplink component carriers.
  • the computer readable program code portion comprises program code instructions for transmitting one media access control random access response packet data unit which multiplexes one or more random access responses for the plurality of parallel preambles from the user equipment.
  • the computer program product comprises at least one computer readable storage medium having a computer readable program code portion stored thereon.
  • the computer readable program code portion comprises program code instructions for receiving, from an evolved Node B, a single signaling message for initiating parallel contention-free random accesses on a plurality of uplink component carriers so as to measure timing advances.
  • the computer readable program code portion further comprises program code instructions for transmitting, to the evolved Node B, a plurality of parallel preambles on the plurality of uplink component carriers.
  • the computer readable program code portion comprises program code instructions for receiving, from the evolved Node B, one media access control random access response packet data unit which multiplexes one or more random access responses for the plurality of parallel preambles.
  • the random access delay may be significantly reduced by using parallel contention-free random accesses, especially in a situation of a large number of UL CCs to be configured Further, by triggering multiple random accesses on a plurality of UL CCs with one PDCCH and making one RAR with respect to a plurality of UL CCs, the PDCCH overhead and the complexity of the blind detection in relation to the UE can be greatly reduced and multiple TAs can be obtained in a efficient manner.
  • a contention based random access may be initiated by the UE on a plurality of UL CCs.
  • robustness of the communication may be realized.
  • direct inclusion of random access commands and information regarding dedicated random access resource (such as the RAPID and PRACH mask index) into the CC configuration message may also render the random access more reliable and less delayed as compared with the prior art.
  • Fig, 1 is a process flow diagram exemplarily illustrating that an e-NB triggers a UE to perform a contention-free random access by using a PDCCH order in LTE ReI-10;
  • FIG. 2 illustrates a diagram of a structure of a prior art MAC RAR
  • FIG. 3 is a process flow diagram illustrating a method for performing parallel contention-free random accesses on a plurality of UL CCs according to an embodiment of the present invention
  • Figs. 4 and 5 illustrate structure diagrams of two modified MAC RAR PDUs that can be applied in the method as illustrated in Fig. 3 ; and [0039] Fig. 6 is a process flow diagram illustrating a method for performing parallel contention-free random accesses on a plurality of UL CCs according to another embodiment of the present invention.
  • DETAILED DESCRIPTION OF EMBODIMENTS
  • the e-NB transmits to a user equipment a single signaling message for triggering parallel contention-free random accesses on a plurality of UL CCs. Then the e-NB receives, from the user equipment, a plurality of parallel preambles on the plurality of UL CCs. Subsequent to receiving the plurality of parallel preambles, the e-NB transmits one or more RARs to the UE.
  • the above single signaling message is addressed to a C-RNTI of the UE on the PDCCH and has a specific bit format such that the UE treats the single signaling message as a trigger for initiating parallel contention-free random accesses.
  • the single signaling message includes information regarding a preamble index, a PRACH mask index, and configuration of the plurality of UL CCs, such that the UE is capable of initiating the parallel contention-free random access without triggering from the PDCCH.
  • Figs. 1 and 2 have been described previously. They schematically illustrate that the e-NB triggers the UE to perform a contention-free random access by using a PDCCH order in LTE Rel-10 and also a structure diagram for a prior art MAC RAR PDU.
  • Fig. 3 is a process flow diagram illustrating a method 300 for performing parallel contention-free random accesses on a plurality of UL CCs according to an embodiment of the present invention.
  • the method starts at step S301 where the e-NB configures one or more UL CCs to UE via dedicated signaling (i.e., a single signaling message).
  • the configuration may include RACH configuration in case the UE needs to perform the random access on the UL CCs.
  • the configuration may also include TA group information so as to indicate to the UE whether the random access should be done to measure the TAs on the UL CCs. It should be understood that the above UL CCs configuration may be preconfigured by the e-NB in advance, prior to the random access, and no longer be configured in the subsequent random access.
  • step S302 the UE may generate a configuration complete signal and transmit it to the e-NB.
  • the UE may start a timer, named prohibitselfRAtimer, whose time duration is illustrated in Fig. 3 by a close brace.
  • the time duration of prohibitselfRAtimer may be preconfigured by the e-NB and the prohibitselfRAtimer may be operated (e.g., started, reset or stopped) by the UE upon the trigger from the e-NB. For example, if the time duration of the prohibitselfRAtimer is configured by the e-NB as 15ms and the PDCCH order for triggering the random access is received by the UE at 10ms, then the UE would reset' and stop the prohibitselfRAtimer for monitoring the next trigger from the PDCCH.
  • the e-NB may configure its value (i.e., time duration) with respect to each UE.
  • the prohibitselfRAtimer should be UE specific, i.e., each UE has only one value of the prohibitselfRAtimer, which would be applied to all the UL CCs;
  • the prohibitselfRAtimer should be started when the ACK signal for the configuration complete signal is received by the UE (not illustrated in Fig. 3);
  • the prohibitselfRAtimer should be reset and stopped.
  • the UE Upon the expiration of the prohibitselfRAtimer, the UE should, on its own, initiate a contention based random access on all the newly configured CCs.
  • the UE If upon expiration of the prohibitselfRAtimer, the UE has already initialized the random access for TA measurement while receiving the PDCCH order for triggering the random access, it is up to a specific UE implementation to decide which one of the random accesses would be continued, which is the same as specified by the LET Rel-8.
  • step S303 the e-NB transmits the single signaling message (i.e., MsgO) addressed to a C-RNTI of the UE on the PDCCH for the random access and wherein the single signaling message has one of two following formats:
  • Preamble index 6 bits
  • PRACH mask index 4 bits
  • RACH category 1 bit, set to "1" for the plurality of UL CCs which need new timing advances and "0" for a SIB2 linked CC;
  • bitSj set to "1, 1 . . . 1, 0" for the plurality of UL CCs which need new timing advances and "1, 1 . . . 1, 1" for a SIB2 linked CC;
  • Preamble index 6 bits
  • PRACH mask index 4 bits
  • the UE when the UE receives the MsgO (i.e., the single signaling message) which complies with one of the above two formats, the UE checks if the PDCCH order is just for one UL CC so as to trigger a single random access or for all the newly configured UL CCs so as to trigger parallel contention-free random accesses for measuring the TAs. Regardless of whether the PDCCH order is directed to one UL CC or a plurality of UL CCs, the RAPID and PRACH mask index as included in the PDCCH order should be applied to all the CCs on which the random accesses would be triggered.
  • the MsgO i.e., the single signaling message
  • step S304 the UE transmits a plurality of parallel preambles (i.e., Msgl) on the plurality of UL CCs.
  • Msgl parallel preambles
  • the UE receives a PDCCH order for triggering a single random access within the time duration of the prohibUselfRAtimer, it should perform a contention-free random access on the SIB2 linked UL CC with the dedicated random access resource indicated in the PDCCH order. Additionally, the UE also needs to reset and stop the prohibitselfRAtimer for this UL CC.
  • the UE may perform parallel contention-free random accesses with the dedicated random access resource as indicated in the PDCCH order. Likewise, the UE needs to reset and stop the prohibitselfRAtimer for the corresponding UL CCs.
  • the above dedicated random access resource refers to the preamble index and PRACH mask index as included in the PDCCH order. In the case of parallel contention-free random accesses, the dedicated preamble index and PRACH mask index with respect to all the UL CCs would be the same. However, each random access may still use the specific configuration with respect to each UL CC respectively.
  • the method 300 proceeds to step S305 where the e-NB transmits one or more RARs (i.e., Msg2) in an aggregation manner to the UE.
  • the e-NB transmits, one MAC RAR PDU which multiplexes one or more RARs for the plurality of parallel preambles from the UE.
  • the UE should monitor a RAR only on the DL CC on which the MsgO is received. In other words, the UE should monitor the RAR on the SIB2 linked DL CC. If the RAR is received and contains the UE's RAPID, the random access on this UL CC would be considered as successful.
  • the UE may monitor one or more RARs only on the DL CC on which the MsgO is received. Because the random accesses are all on a contention-free basis, the e-NB would have a competence to know that the received preamble is from a certain UE and multiplex (or aggregate) one or more RARs with respect to a plurality of UL CCs into one MAC RAR PDU.
  • the two formats of such a MAC RAR PDU are illustrated in Figs. 4 and 5, respectively.
  • FIG. 4 exemplarily illustrates a structure diagram of a modified MAC RAR PDU that can be applied in the method 300 as illustrated in Fig. 3.
  • the RARs are carried by a MAC RAR PDU and a padding field of the MAC RAR PDU comprises a bitmap which indicates each RAR belongs to which one of the plurality of UL CCs. If the UE receives such a MAC RAR PDU, it should first check in the MAC header to determine whether the MAC header contains a same RAPID as the one it transmitted.
  • the UE may look up the padding field to obtain the bitmap, e.g., 1 0 0 1 as illustrated in the drawing.
  • the bitmap 1 0 0 1 ranked in a descending order of CC index (i.e., CC4 to CCl), indicates that MAC RARl belongs to UL CCl and MAC RAR2 belongs to UL CC4 and there is no MAC RARs belong to UL CC2 and UL CC3 respectively. Accordingly, the random accesses with respect to the UL CCl and UL CC 4 are successful. Because in LTE Rel-8/9/10, the bitmap is within the padding field, such a MAC RAR PDU format is totally backward compatible.
  • Fig. 5 exemplarily illustrates a structure diagram of another modified MAC RAR PDU that can be applied in the method 300 as illustrated in Fig. 3. Because the RAPID and PRACH resource have been configured to the UE, the e-NB would have the competence to know whether the RAPID may use the aggregated RAR. As illustrated in Fig. 5, the RARs are carried by (or aggregated in) a MAC RAR PDU, and a MAC RAR field corresponding to a preamble identifier of the plurality of parallel preambles comprises the one or more RARs to one or more of the plurality of UL CCs and a bitmap which is used for indicating the one or more of the plurality of UL CCs.
  • the bitmap as illustrated in Fig. 5 is similar to the one as illustrated in Fig. 4. However, in such a modified MAC MAR, the RARs for CCl and CC4 are co-located within a single MAC RAR2.
  • the e-NB may also transmit each RAR on system information block2 linked DL CC respectively without any change to the format of the current MAC RAR PDU.
  • the UE would monitor each RAR on the concerned DL CC prior to transmitting the dedicated preambles.
  • the method 600 comprises the steps of the e-NB transmitting MsgO to the UE (at step S601), the UE transmitting a configuration complete signal to the e-NB (at step S602), the UE transmitting Msgl to the e-NB (at step S603), and the e-NB transmitting Msg2 to the UE (at step S604) 5 which are similar to those steps as illustrated in method 300.
  • configuration of a CC (or CCs) at step S601 may also include configuring a preamble index on each CC and dedicated RACH resource index (same or different between the CCs) on which UE should perform the random access. Because the UE has received, from the e-NB, signaling information regarding the random access at the phase of an initial configuration of a plurality of UL CCs, it is unnecessary to configure a timer to monitor a trigger (e.g., the PDCCH order) from the e-NB. In other words, the UE would perform parallel contention-free random accesses immediately upon receipt of an AC signal for the configuration complete signal.
  • a trigger e.g., the PDCCH order
  • the foregoing computer program instructions can be, for example, sub-routines and/or functions.
  • a computer program product in one embodiment of the invention comprises at least one computer readable storage medium, on which the foregoing computer program instructions are stored.
  • the computer readable storage medium can be, for example, an optical compact disk or an electronic memory device like a RAM (random access memory) or a ROM (read only memory).

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Abstract

L'invention porte sur des procédés, des appareils et des produits programmes d'ordinateur pour effectuer des accès aléatoires sur des porteuses composantes de liaison montante. Un procédé consiste à envoyer à un équipement utilisateur (UE) un message de signalisation unique pour déclencher des accès aléatoires parallèles sans conflit d'accès sur une pluralité de porteuses composantes de liaison montante de manière à mesurer des avances temporelles; recevoir de l'équipement utilisateur une pluralité de préambules parallèles sur la pluralité de porteuses composantes de liaison montante; et envoyer une seule unité de données par paquets de réponse d'accès aléatoire de commande d'accès au support qui multiplexe une ou plusieurs réponses d'accès aléatoire pour la pluralité de préambules parallèles provenant de l'équipement utilisateur. Un autre procédé consiste à recevoir d'un nœud B évolué (eNB) un message de signalisation unique pour déclencher des accès aléatoires parallèles sans conflit d'accès sur une pluralité de porteuses composantes de liaison montante de manière à mesurer des avances temporelles; envoyer au nœud B évolué une pluralité de préambules parallèles sur la pluralité de porteuses composantes de liaison montante; et recevoir du nœud B évolué une seule unité de données par paquets de réponse d'accès aléatoire de commande d'accès au support qui multiplexe une ou plusieurs réponses d'accès aléatoires pour la pluralité de préambules parallèles. Grâce à la présente invention¸ le retard d'accès aléatoire et le surdébit du canal de commande de liaison descendante physique (PDCCH) peuvent être fortement réduits.
PCT/CN2010/076490 2010-08-31 2010-08-31 Réalisation d'accès aléatoires sur des porteuses composantes de liaison montante Ceased WO2012027887A1 (fr)

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US9883534B2 (en) * 2011-03-31 2018-01-30 China Academy Of Telecommunications Technology Random access method and apparatus based on multiple uplink timing advances
US20140044074A1 (en) * 2011-03-31 2014-02-13 China Academy Of Telecommunications Technology Random access method and apparatus based on multiple uplink timing advances
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CN108632010A (zh) * 2017-03-25 2018-10-09 华为技术有限公司 无线通信方法、装置及系统
WO2018226129A1 (fr) * 2017-06-05 2018-12-13 Telefonaktiebolaget Lm Ericsson (Publ) Gestion d'accès à un réseau de communication sans fil
CN113906815A (zh) * 2019-05-02 2022-01-07 上海诺基亚贝尔股份有限公司 随机接入过程中的竞争解决
CN113906815B (zh) * 2019-05-02 2024-04-19 上海诺基亚贝尔股份有限公司 随机接入过程中的竞争解决
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WO2023184321A1 (fr) * 2022-03-31 2023-10-05 Qualcomm Incorporated Réalisation de multiples procédures d'accès aléatoire parallèles

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