WO2013039283A1 - Accès aléatoire amélioré à un réseau hétérogène - Google Patents

Accès aléatoire amélioré à un réseau hétérogène Download PDF

Info

Publication number
WO2013039283A1
WO2013039283A1 PCT/KR2012/001534 KR2012001534W WO2013039283A1 WO 2013039283 A1 WO2013039283 A1 WO 2013039283A1 KR 2012001534 W KR2012001534 W KR 2012001534W WO 2013039283 A1 WO2013039283 A1 WO 2013039283A1
Authority
WO
WIPO (PCT)
Prior art keywords
random access
sequence
network
rrhs
groups
Prior art date
Application number
PCT/KR2012/001534
Other languages
English (en)
Inventor
Dragan Vujcic
Original Assignee
Lg Electronics Inc.
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 Lg Electronics Inc. filed Critical Lg Electronics Inc.
Publication of WO2013039283A1 publication Critical patent/WO2013039283A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • 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

  • the present document is directed to an enhanced random access to a heterogeneous network. More specifically, the present document is directed to a method for a user equipment (UE) to perform a random access to a network comprising a macro eNB and one or more remote radio heads (RRHs), and apparatus for the same.
  • UE user equipment
  • RRHs remote radio heads
  • LTE 3rd generation partnership project
  • LTE long term evolution
  • FIG. 1 is a schematic diagram of E-UMTS network structure as an example of a mobile communication system.
  • E-UMTS evolved universal mobile telecommunications system
  • UMTS universal mobile telecommunications system
  • LTE long term evolution
  • E-UMTS network can be mainly divided into E-UTRAN (evolved-UMTS terrestrial radio access network) 101 and CN 102 (core network).
  • the E-UTRAN 101 consists of a user equipment (hereinafter abbreviated UE) 103, a base station (hereinafter named eNode B or eNB) 104, and an access gateway (hereinafter abbreviated AG) 105 located at an end point of the network to be externally connected to an external network.
  • the AG 105 can be divided into one part responsible for user traffic processing and the other part for processing control traffic. In this case, the AG for new user traffic processing and the AG for processing control traffic can communicate with each other using a new interface.
  • At least one cell can exist at one eNode B. Between eNode Bs, an interface for user or control traffic transmission is usable. And, the CN 102 can consist of a node for user registrations of the AG 105 and other UE 103. Moreover, an interface for discriminating the E-UTRAN 101 and the CN 102 is available.
  • Layers of a radio interface protocol between a user equipment and a network can be divided into L1 (first layer), L2 (second layer) and L3 (third layer) based on three lower layers of the open system interconnection (OSI) reference model widely known in the field of communication systems.
  • a physical layer belonging to the first layer provides an information transfer service using a physical channel.
  • a radio resource control (hereinafter abbreviated RRC) located on the third layer plays a role in controlling radio resources between the user equipment and the network.
  • the RRC layers exchange RRC messages between the user equipment and the network.
  • the RRC layers can be distributed to network nodes including the eNode B 104, the AG 105 and the like.
  • the RRC layer can be provided to the eNode B 104 or the AG 105 only.
  • FIG. 2 and FIG. 3 are diagrams for structures of a radio interface protocol between a user equipment and UTRAN based on the 3GPP radio access network specifications.
  • a radio interface protocol horizontally consists of a physical layer, a data link layer and a network layer.
  • the radio interface protocol vertically consists of a user plane for data information transfer and a control plane for control signal delivery (signaling).
  • FIG. 2 shows the respective layers of the radio protocol control plane
  • FIG. 3 shows the respective layers of the radio protocol user plane.
  • the radio protocol layers shown in FIG. 2 and FIG. 3 can be divided into L1 (first layer), L2 (second layer) and L3 (third layer) based on three lower layers of the open system interconnection (OSI) reference model widely known in the field of communication systems.
  • OSI open system interconnection
  • a physical (PHY) layer of a first layer provides an upper layer with an information transfer service using a physical channel.
  • the physical (PHY) layer is connected to a medium access control (MAC) layer on an upper layer via a transport channel.
  • MAC medium access control
  • data is transported between the medium access control (MAC) layer and the physical (PHY) layer via the transport channel.
  • the transport channel can be classified into a dedicated transport channel or a common transport channel according to whether a channel is shared or not.
  • data are transported via the physical channel between different physical layers, i.e., between a physical layer of a transmitting side and a physical layer of a receiving side.
  • MAC medium access control
  • RLC radio link control
  • the logical channel can be mainly categorized into a control channel for transferring information of a control plane and a traffic channel for transferring information of a user plane according to a type of the transferred information.
  • a radio link control (hereinafter abbreviated RLC) of the second layer performs segmentation and concatenation on data received from an upper layer to play a role in adjusting a size of the data to be suitable for a lower layer to transfer the data to a radio section.
  • the RLC layer provides three kinds of RLC modes including a transparent mode (hereinafter abbreviated TM), an unacknowledged mode (hereinafter abbreviated UM) and an acknowledged mode (hereinafter abbreviated AM) to secure various kinds of QoS demanded by each radio bearer (hereinafter abbreviated RB).
  • TM transparent mode
  • UM unacknowledged mode
  • AM acknowledged mode
  • RB radio bearer
  • the AM RLC performs a retransmission function through automatic repeat and request (ARQ) for the reliable data transfer.
  • a packet data convergence protocol (hereinafter abbreviated PDCP) layer of the second layer performs a header compression function for reducing a size of an IP packet header containing relatively large and unnecessary control information to efficiently transmit such an IP packet as IPv4 and IPv6 in a radio section having a small bandwidth. This enables a header part of data to carry mandatory information only to play a role in increasing transmission efficiency of the radio section.
  • the PDCP layer performs a security function as well. This consists of ciphering for preventing data interception conducted by a third party and integrity protection for preventing data manipulation conducted by a third party.
  • a radio resource control (hereinafter abbreviated RRC) layer located at a most upper part of a third layer is defined in the control plane only and is responsible for controlling a logical channel, a transport channel and physical channels in association with configuration, reconfiguration and release of radio bearers (hereinafter abbreviated RBs).
  • the RB means a logical path provided by the first and second layers of the radio protocol for the data delivery between the user equipment and the UTRAN.
  • configuring an RB means to stipulate characteristics of radio protocol layers and channels required for providing a specific service and also means to configure detailed parameters and operational methods thereof.
  • the RB can be classified into a signaling RB (SRB) or a data RB DRB).
  • SRB signaling RB
  • DRB data RB
  • a downlink transport channel for transporting data to a user equipment from a network there is a broadcast channel (BCH) for transmitting system information and a downlink shared channel (SCH) for transmitting a user traffic or a control message.
  • BCH broadcast channel
  • SCH downlink shared channel
  • Downlink multicast traffic of a broadcast service or a control message can be transmitted on downlink SCH or a separate downlink MCH (multicast channel).
  • RACH random access channel
  • SCH uplink shared channel
  • a downlink physical channel for transmitting information transferred on a downlink transport channel to a radio section between a network and a user equipment there is a physical broadcast channel for transferring information of BCH, a physical multicast channel (PMCH) for transmitting information of MCH, a physical downlink shared channel for transmitting information of PCH and downlink SCH or a physical downlink control (or called DL L1/L2 control channel) for transmitting control information provided by first and second layers.
  • PMCH physical multicast channel
  • MCH physical downlink shared channel
  • PCH and downlink SCH or a physical downlink control (or called DL L1/L2 control channel) for transmitting control information provided by first and second layers.
  • PUSCH physical uplink shared channel
  • PRACH physical random access channel
  • PUCCH physical uplink control channel
  • An LTE User Equipment can only be scheduled for uplink transmission if its uplink transmission timing is synchronized.
  • the LTE Random Access CHannel (RACH) therefore plays a key role as an interface between non-synchronized UEs and the orthogonal transmission scheme of the LTE uplink radio access.
  • the random access procedure of the current LTE system does not consider a situation where the network is heterogeneous. That is, when we carefully consider the network comprises a macro eNB and one or more remote radio heads (RRHs), we can reduce a radio resource overhead for the RACH and enhance the efficiency of the random access.
  • RRHs remote radio heads
  • the present invention is directed to a method for a user equipment (UE) to perform a random access to a network comprising a macro eNB and one or more remote radio heads (RRHs), and apparatus for the same.
  • UE user equipment
  • RRHs remote radio heads
  • An object of the present invention is to provide an enhanced random access scheme not only considering a radio link between a UE and a macro eNB, but also considering a radio link between a UE and RRHs within a cell.
  • a sequence group among a plurality of predetermined sequence groups considering (a) a size of data to be transmitted from the UE, (b) a pathloss between the macro eNB and the UE, and (c) a metric related with at least one among the RRHs; selecting a preamble sequence from the selected sequence group; and transmitting the selected preamble sequence to the network.
  • the random access to the network may be based on a contention based random access scheme.
  • the method may further comprises: receiving system information from the network before transmitting the selected preamble sequence, wherein the system information may comprise random access channel (RACH) configuration information and information for the metric.
  • RACH random access channel
  • the information for the metric may comprise a number of the RRHs within the network.
  • the plurality of predetermined sequence groups may comprise a sequence group A and a sequence group B, and each of the sequence group A and the sequence group B may comprise one or more sub groups. Transmission powers for each of the sub groups may be different from each other.
  • a number of the sub groups of the sequence group A and the sequence group B may correspond to a number of the RRHs.
  • the information for the metric may comprise a number of the sub groups.
  • the information for the metric may comprise information for threshold values for each of the sub groups.
  • the method may further comprises: receiving a random access response from the network after transmitting the selected preamble sequence, wherein the random access response comprises at least one of (a) a timing advanced command for the at least one among the RRHs and (b) a power adjustment parameter for the at least one among the RRHs.
  • the random access response may be received from the macro eNB or at least one among the RRHs
  • the method may further comprises: transmitting uplink data to the network, based on the at least one of (a) the timing advanced command and (b) the power adjustment parameter.
  • a user equipment performing a random access to a network comprising a macro eNB and one or more remote radio heads (RRHs), the UE comprising: a processor configured to select a sequence group among a plurality of predetermined sequence groups considering (a) a size of data to be transmitted from the UE, (b) a pathloss between the macro eNB and the UE, and (c) a metric related with at least one among the RRHs, and to select a preamble sequence from the selected sequence group; and a radio frequency (RF) unit coupled with the processor and configured to transmit the selected preamble sequence to the network is proposed.
  • RF radio frequency
  • FIG. 1 is a schematic diagram of E-UMTS network structure as an example of a mobile communication system
  • FIG. 2 and FIG. 3 are diagrams for structures of a radio interface protocol between a user equipment and UTRAN based on the 3GPP radio access network specifications;
  • FIGs. 4 and 5 are procedural diagrams illustrating Contention-based Random Access Procedure and Non-Contention-based Random Access Procedure;
  • Fig. 6 shows the concept of the heterogeneous network for the present invention
  • Fig. 7 is for explaining the overall process of embodiments of the present invention.
  • FIG. 8 shows apparatuses for implementing the present invention.
  • a terminal is a generic term of such a mobile or fixed user-end device as a user equipment (UE), a mobile station (MS) and the like.
  • UE user equipment
  • MS mobile station
  • eNB is a generic name of such a random node of a network end, such as a base station, which communicates with a terminal, as a Node B, an eNnode B and the like.
  • the present invention is directed to a method for a user equipment (UE) to perform a random access to a network comprising a macro eNB and one or more remote radio heads (RRHs), and apparatus for the same.
  • UE user equipment
  • RRHs remote radio heads
  • the LTE random access procedure comes in two forms, allowing access to be either contention-based (implying an inherent risk of collision) or contention-free.
  • a UE initiates a contention-based random access procedure for all use-cases listed as following.
  • new uplink data or control information e.g. an event-triggered measurement report
  • the eNodeB has the option of preventing contention occurring by allocating a dedicated signature to a UE, resulting in contention-free access. This is faster than contention-based access - a factor which is particularly important for the case of handover, which is time-critical.
  • a fixed number (64) of preamble signatures is available in each LTE cell, and the operation of the two types of RACH procedure depends on a partitioning of these signatures between those for contention-based access and those reserved for allocation to specific UEs on a contention-free basis.
  • FIGs. 4 and 5 are procedural diagrams illustrating Contention-based Random Access Procedure and Non-Contention-based Random Access Procedure.
  • the slightly unpredictable latency of the random access procedure can be circumvented for some use cases where low latency is required, such as handover and resumption of downlink traffic for a UE, by allocating a dedicated signature to the UE on a per-need basis.
  • the procedure is simplified as shown in Figure 5. The procedure terminates with the RAR.
  • Fig. 6 shows the concept of the heterogeneous network for the present invention.
  • CoMP performance gain is obtained when the macro eNode B dynamically mute specific time/frequency resources to the UEs connected to the RRHs. Depending on the UE location within the cell, it can be optimized for downlink transmission to be performed from the closest single TP or the closest set of TP(s). Thus, it is preferable that the network can determine the TP(s) from which the UE is experiencing better radio conditions.
  • sequence groups A and B there are 2 predetermined sequence groups (sequence groups A and B).
  • the UE may select one of the sequence group based on the size of data to be transmitted from the UE and radio condition between the UE and the macro eNB.
  • radio condition criteria on selection of the sequence groups it can be simply represented such that when the UE has a good radio condition with the macro eNB, the UE may select sequence group A, otherwise select sequence group B.
  • one embodiment of the present invention proposes to further consider some metric related with a corresponding RRH among the RRHs within the cell.
  • the random access procedure can be enhanced to reduce the RACH overheadand etc.
  • UE 1 may select sequence group B based on the original criteria, since it is located far from the macro eNB.
  • UE1 since UE1 is close to TP 1, it may access to the TP 1 using the sequence group A, rather than the macro eNB (TP 0) using sequence group B.
  • the metric related with the RRH can be used for this determination.
  • System information may inform the UEs with only the number of RRHs within the network, and the UEs may acquire detailed information from each of RRHs.
  • sequence groups can be further partitioned into multiple sub-groups to support each of the RRHs. That is, UE 1 may select a specific sub-group for TP 1 and UE 2 may select another specific sub-group for TP 2.
  • only the sequence group B may be further partitioned into sub-groups. And, when the sequence group A is not selected by a first criteria not related with the RRHs, the second criteria related with the RRHs is used to select one of sub-groups of sequence group B.
  • the UE may select a preamble sequence from the selected sequence group and transmit the selected preamble sequence to the network.
  • Fig. 7 is for explaining the overall process of embodiments of the present invention.
  • the random access procedure can be initiated by a PDCCH order or by the MAC sublayer itself.
  • the random access procedure initiated by a PDCCH order can be referred to as non-contention based random access procedure as explaiend with regards to Fig. 5, and the random access procedure initiated by the MAC sublayer itself can be referred to as contention based random access procedure as explained with regards to Fig. 4.
  • Fig. 7 assumed that the random access procedure is contention based.
  • the above mentioned embodiment assumed that there are two random access sequence groups A and B. But, there can be a situation where preamble sequence group B does not exist.
  • the preambles that are contained in Random Access Preambles group A and Random Access Preambles group B can be calculated from the parameters indicating the number of random access preambles (numberOfRA-Preambles) and the size of the random access preamble group A (sizeOfRA-PreamblesGroupA).
  • the network may transmit/broadcast system information to UEs, and the UEs may try to retrieve information on the system information (step 0).
  • the system information may include the above mentioned parameters.
  • sizeOfRA-PreamblesGroupA is equal to numberOfRA-Preambles then there is no Random Access Preambles group B. Then, the preambles in Random Access Preamble group A are the preambles 0 to sizeOfRA-PreamblesGroupA-1. But, if Random Access Preambles group B exists, the preambles in Random Access Preamble group B are the preambles sizeOfRA-PreamblesGroupA to numberOfRA-Preambles-1 from the set of 64 preambles.
  • Random Access Preambles group B exists, the thresholds, messagePowerOffsetGroupB and messageSizeGroupA, the configured UE transmitted power, PCMAX, and the offset between the preamble and Msg3, deltaPreambleMsg3, that are required for selecting one of the two groups of Random Access Preambles. These can be acquired from the received system information.
  • the system information may further include information for the metric related with at least one among the RRHs within the network.
  • the information for the metrc may include the number of RRHs within the network.
  • each of or one of the above mentioned sequence groups A and B can be further partitioned into multiple sub groups to support the preferred embodiment of the present invention.
  • the information of the system information for the metrc may include the number of each subgroups.
  • the number of sub-groups may corresponds to the number of RRHs, but it may not be limited to that.
  • the selection of the sequence group can be based on the following cirteria.
  • the Random Access Preambles group B may be selected. Otherwise, the Random Access Preambles group A may be selected.
  • the sequence group B is further partitioned into sub-groups. And, if the sequence group A is not selected, a secondary criteria related with the RRHs are considered. For example, when UE 1 of Fig. 6 determines that the sequence group A is not selected and it is closer to TP 1 than the macro eNB (TP0), UE 1 may select sub-group of sequence group B for TP 1. The metric related with pathloss for TPs can be used for this selection. For this end, the system information may inform the UE of RRH related information, and the UEs can use this information to determine the pathlosses with RRHs.
  • both of the sequence groups A and B are further partitioned into sub-groups.
  • the UE may further consider the metric related with at least one among RRHs within the network. Based on this consideration, the UE may selects appropriate sub-group and select the preamble sequence within this selected sub-group.
  • the UE may select a preamble sequence from the selected sequence group and transmit the selected preamble sequence to the network (step 1 of Fig. 7). Then, the network tries to detect preambles within a predetermined time period.
  • the UE may receive random access response message including timing advanced command and power adjustment parameters (step 2 of Fig. 7).
  • the random access response may further include at least one of (a) a timing advanced command for the at least one among the RRHs and (b) a power adjustment parameter for the at least one among the RRHs.
  • This random access response message can be received from the macro eNB or from one or more of corresponding RRHs.
  • the UE may transmit uplink data to the network (step 3 of Fig. 7).
  • the network may indicate collision or assign resource as requested by the message 3 (step 4 of Fig. 7).
  • the UE may proceed to decode the Physical Broadcast CHannel (PBCH), from which system information is obtained (e.g. RACH configuration information).
  • PBCH Physical Broadcast CHannel
  • RACH configuration information informs the UE of the RACH format, allocated subframe for RACH, etc.
  • the UE does not need to decode the PBCH; it simply makes quality-level measurements based on the reference signals (RS) transmitted from the newly-detected cell and reports these to the serving cell.
  • RS reference signals
  • the decoded PBCH may inform the UE of RACH configuration information and the signature grouping rule.
  • a set of signatures is allocated for each time/frequency random access resource for each cell. In Rel.8, these signatures are divided into three groups:
  • the signatures of one of the groups are assigned explicitly to be used for the non-contention (dedicated) based access.
  • the other two groups are used for the contention based access, and their selection is used to indicate information on size of Msg3 and the requested resource blocks limited by eNB.
  • the UE with good radio condition would choose one of preamble from group A while those experienced with bad radio conditions (usually those far from eNB) would choose one of preamble from group B.
  • preamble group B is further partitioned according different level of radio conditions associated to the RRHs (difference between Macro eNB and RRHs experienced radio conditions)
  • the UE may estimate the radio condition compared to the Macro eNB also as compared to the RRH. Then, the UE may select randomly and transmits the preamble from group with better channel conditions. The UE may use the following equation when comparing.
  • the eNB/RRH transmits to the UE the timing alignment and power adjustment based on the group to which the received signature preamble belongs to.
  • the step 5 following the step 4 of Fig. 7 is proposed, in which eNB can assign specific/dedicated RRH resources to the UE by triggering the non-contention RACH procedure.
  • Another approach can be referred to as the use of RRH specific/information in contention based RACH procedure.
  • the UE may select and transmit a contention based preamble based on Rel.8 procedure (i.e. only 2 group of preamble sequence, group A and B).
  • the eNB detects the preamble, and if the detected preamble belongs to the group B, then eNB indicates in Msg2 additional information related to the RRH, otherwise the former Rel8 procedure continues as explained.
  • the additional information in case of preamble group B, may be any information (e.g. identifiers, resources, etc..) related to the RRH.
  • information e.g. identifiers, resources, etc..
  • it can be the RRH’s specific identifier that UE would be included or scrambled into the Msg3.
  • one preferred embodiment proposes adjusting a transmission power of the random access sequence according to the selected sequence group.
  • a preamble transmission power PPRACH is determined as in Equation 2.
  • PPRACH min ⁇ P CMAX , PREAMBLE_RECEIVED_TARGET_POWER + PL ⁇ _[dBm],
  • P CMAX is the configured UE transmit power (usually it is the maximum UE power, but in some area like hospital area the network has possibility to limit the UE max. transmission power by signalling)
  • PL is the downlink pathloss estimate calculated in the UE.
  • the PL is based on the measured received power at the UE and the max. Tx. power which is signalled by the eNB.
  • PREAMBLE_RECEIVED_TARGET_POWER preambleInitialReceivedTargetPower+ DELTA_PREAMBLE
  • DELTA_PREAMBLE is the preamble format based power offset values specified for each preamble format as follows
  • TP e.g. UE 1 connected to the TP1
  • preambleInitialReceivedTargetPower i.e. TP1’s max. transmission power
  • TP1 preambleInitialReceivedTargetPower
  • PL min ⁇ PLeNB, PLRRH0, PLRRH1, PLRRH3,... ⁇ _[dBm],
  • preambleInitialReceivedTargetPower can be the target received preamble power at the RRH. Additional adjustment to the DELTA_PREAMBLE based on the power offset (delta_offsrt) values can be also included.
  • FIG. 8 shows apparatuses for implementing the present invention.
  • a wireless communication system can include one or more TPs and one or more UE 20.
  • a transmitter may be a part of the TP 10
  • a receiver may be a part of the UE 20.
  • a TP 10 may include a processor 11, a memory 12, and a radio frequency (RF) unit 13.
  • the processor 11 may be configured to implement proposed procedures and/or methods described in this document.
  • the memory 12 is coupled with the processor 11 and stores a variety of information to operate the processor 11.
  • the RF unit 13 is coupled with the processor 11 and transmits and/or receives a radio signal.
  • TP 10 can be a macro eNB or any one of RRHs of the above explained embodiments.
  • a UE 20 may include a processor 21, a memory 22, and a RF unit 23.
  • the processor 21 may be configured to implement proposed procedures and/or methods described in this application.
  • the memory 22 is coupled with the processor 21 and stores a variety of information to operate the processor 21.
  • the RF unit 23 is coupled with the processor 21 and transmits and/or receives a radio signal.
  • the TP 10 and/or the UE 20 may have single antenna or multiple antennas. When at least one of the TP 10 and the UE 20 has multiple antennas, the wireless communication system may be called as multiple input multiple output (MIMO) system.
  • MIMO multiple input multiple output

Landscapes

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

Abstract

La présente invention concerne un procédé permettant à un équipement utilisateur (UE) d'effectuer un accès aléatoire à un réseau comportant un macro nœud B évolué et une ou des tête(s) de radio éloignée(s) (RRH), et un appareil correspondant. Le procédé comprend les étapes suivantes: la sélection d'un groupe de séquences parmi une pluralité de groupes de séquences prédéterminées en tenant compte (a) de la taille des données à transmettre depuis l'équipement utilisateur, (b) de l'affaiblissement de propagation entre le macro nœud eNb et l'équipement utilisateur, et (c) d'une métrique associée à au moins une parmi les têtes de radio ; la sélection d'une séquence de préambule parmi le groupe de séquences sélectionné ; et la transmission de la séquence de préambule sélectionnée vers le réseau.
PCT/KR2012/001534 2011-09-18 2012-02-29 Accès aléatoire amélioré à un réseau hétérogène WO2013039283A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201161536025P 2011-09-18 2011-09-18
US61/536,025 2011-09-18

Publications (1)

Publication Number Publication Date
WO2013039283A1 true WO2013039283A1 (fr) 2013-03-21

Family

ID=47883486

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2012/001534 WO2013039283A1 (fr) 2011-09-18 2012-02-29 Accès aléatoire amélioré à un réseau hétérogène

Country Status (1)

Country Link
WO (1) WO2013039283A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090129325A (ko) * 2008-06-12 2009-12-16 한국전자통신연구원 임의 접속 프리앰블을 그룹핑하는 통신 시스템
KR20100119453A (ko) * 2009-04-30 2010-11-09 삼성전자주식회사 이동통신시스템의 ｒａｃｈ 채널 정보 전송 방법
US20100296467A1 (en) * 2009-04-23 2010-11-25 Interdigital Patent Holdings, Inc. Method and apparatus for random access in multicarrier wireless communications

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090129325A (ko) * 2008-06-12 2009-12-16 한국전자통신연구원 임의 접속 프리앰블을 그룹핑하는 통신 시스템
US20100296467A1 (en) * 2009-04-23 2010-11-25 Interdigital Patent Holdings, Inc. Method and apparatus for random access in multicarrier wireless communications
KR20100119453A (ko) * 2009-04-30 2010-11-09 삼성전자주식회사 이동통신시스템의 ｒａｃｈ 채널 정보 전송 방법

Similar Documents

Publication Publication Date Title
WO2019160343A1 (fr) Procédé et appareil d'exécution d'une transmission de liaison montante avec des faisceaux pré-attribués dans un système de communication sans fil
WO2010077004A2 (fr) Technique d'accès aléatoire pour équipement utilisateur
WO2017052144A1 (fr) Procédé pour réaliser une procédure d'accès aléatoire dans un mode de couverture améliorée dans un système de communication sans fil et dispositif associé
WO2011046377A2 (fr) Affectation de ressources radio
WO2017065468A1 (fr) Procédé et appareil de contrôle de procédure d'attente pour une amélioration de couverture dans un système de communications sans fil
WO2011136558A2 (fr) Procédé et appareil pour l'exécution de procédures d'accès direct dans un système de communication sans fil
WO2013005972A2 (fr) Procédé permettant à un terminal de contrôler un groupe d'avance de synchronisation dans un système de communication sans fil, et dispositif pour la mise en œuvre dudit procédé
WO2012138154A2 (fr) Procédé et dispositif permettant de transmettre un accès aléatoire et d'autres canaux de liaison montante d'une autre cellule dans une agrégation de porteuses d'un système de communication mobile
WO2016163845A1 (fr) Procédé et appareil pour exécuter un procédé d'accès aléatoire en fonction d'un conflit plutôt qu'un procédé d'accès aléatoire sans conflit dans un système de communication sans fil
WO2013055108A2 (fr) Procédé de fonctionnement concernant un système de communication sans fil utilisant la technologie de l'agrégation de porteuses, et dispositif associé
WO2009113815A2 (fr) Procédé d'accès aléatoire pour améliorer l'efficacité d'embrouillage
WO2010079941A2 (fr) Procédé de gestion d'instruction d'alignement temporel durant une procédure d'accès aléatoire
WO2010143851A2 (fr) Procédé et appareil pour un accès aléatoire dans un système de communication sans fil multiporteuse
WO2010143846A2 (fr) Procédé permettant à un équipement utilisateur d'effectuer un accès aléatoire dans un système de communication mobile avec regroupement de porteuses
WO2012096485A2 (fr) Procédé et appareil d'accès aléatoire d'ue dans un système de communication mobile
WO2011139043A2 (fr) Procédé et appareil pour réaliser un processus d'accès aléatoire dans un système de communication sans fil
WO2016144082A1 (fr) Procédé d'exploitation de procédure d'accès aléatoire dans un système de communication sans fil, et dispositif à cet effet
WO2013048137A2 (fr) Procédé et dispositif d'accès direct dans un système de communication sans fil prenant en charge plusieurs porteuses
WO2016144084A1 (fr) Procédé d'exécution d'une procédure d'accès aléatoire rapide dans un système de communication sans fil et dispositif associé
WO2018199693A1 (fr) Procédé pour effectuer un accès aléatoire, et dispositif prenant en charge celui-ci
WO2019031797A1 (fr) Procédé permettant de réaliser une procédure d'accès aléatoire dans un système de communication sans fil et dispositif s'y rapportant
WO2014182131A1 (fr) Procédé permettant de configurer un identifiant de terminal dans un système de communication sans fil supportant la double connectivité et appareil associé
WO2017209433A1 (fr) Procédé et appareil de mesure de synchronisation de liaison descendante dans un système de communication sans fil
WO2012111984A2 (fr) Procédé permettant de rapporter des informations de mesure d'un terminal dans un système de communication sans fil et appareil associé
WO2023038327A1 (fr) Procédé et dispositif d'accès à une cellule par un terminal à performances réduites dans un système de communication mobile sans fil

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12831248

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12831248

Country of ref document: EP

Kind code of ref document: A1