WO2011084033A2 - Système de communication sans fil et son procédé d'accès aléatoire - Google Patents

Système de communication sans fil et son procédé d'accès aléatoire Download PDF

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Publication number
WO2011084033A2
WO2011084033A2 PCT/KR2011/000175 KR2011000175W WO2011084033A2 WO 2011084033 A2 WO2011084033 A2 WO 2011084033A2 KR 2011000175 W KR2011000175 W KR 2011000175W WO 2011084033 A2 WO2011084033 A2 WO 2011084033A2
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Prior art keywords
random access
carrier
value
rach
pathloss
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Ceased
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PCT/KR2011/000175
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WO2011084033A3 (fr
Inventor
Kyeong In Jeong
Soeng Hun Kim
Jung Soo Jung
Sang Bum Kim
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Priority claimed from KR1020100004801A external-priority patent/KR101568139B1/ko
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to US13/521,117 priority Critical patent/US9455807B2/en
Publication of WO2011084033A2 publication Critical patent/WO2011084033A2/fr
Publication of WO2011084033A3 publication Critical patent/WO2011084033A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • 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

Definitions

  • the present invention relates to wireless communications and, in particular, to a random access method of a User Equipment (UE) in a wireless communication system supporting carrier aggregation which allows transmitting data on multiple carriers.
  • UE User Equipment
  • LTE Long Term Evolution
  • resource allocation is performed based on the data amount to be transmitted and channel condition.
  • the data communication service is provided with a resource management policy in which the resource is allocated on the basis of the data amount to be transmitted and channel condition unlike the voice communication server.
  • a scheduler assigns resources to the user equipments in consideration of the available resource, channel condition, and data amount.
  • the LTE system as one of the next generation mobile communication systems also operates with the scheduler which is located in the evolved Node B (eNB) and manages radio resources.
  • eNB evolved Node B
  • LTE-A LTE-Advanced
  • multiple LTE/component carriers can be assigned to a single UE in order to increase transmission speed.
  • RACH Random Access Channel
  • the present invention provides a method for determining a UL carrier for random access in an LTE-A system supporting carrier aggregation.
  • a random access method for a wireless communication system supporting carrier aggregation includes receiving, at a terminal, Random Access Channel (RACH) selection information necessary for random access, the RACH selection information being transmitted by a base station; selecting, when the random access is triggered, an uplink carrier on which the random access is attempted based on the RACH selection information; and attempting the random access on the selected uplink carrier.
  • RACH Random Access Channel
  • a random access communication system includes a base station which configures and transmits Random Access Channel (RACH) selection information necessary for random access; and a terminal which selects, when the random access is triggered, an uplink carrier based on the RACH selection information and attempts the random access on the selected uplink carrier.
  • RACH Random Access Channel
  • the random access method of the present invention facilitates selecting the UL carrier for the random access based on the RACH selection information provided by the eNB in a wireless communication system supporting UL carrier aggregation.
  • FIG. 1 is a schematic diagram illustrating a mobile communication system to which a random access method according to an embodiment of the present is applied;
  • FIG. 2 is a diagram illustrating a principle of carrier aggregation for a UE in an LTE-A system according to an embodiment of the present invention
  • FIG. 3 is a signaling diagram illustrating a UL carrier selection procedure for random access in a wireless communication system according to the first embodiment of the present invention
  • FIG. 4 is a flowchart illustrating steps of the UL carrier selection procedure that are performed in the eNB according to the first embodiment of the present invention
  • FIG. 5 is a flowchart illustrating steps of the UL carrier selection procedure that are performed in the UE according to the first embodiment of the present invention
  • FIG. 6 is a flowchart illustrating steps of the UL carrier selection procedure that are performed in the UE according to the second embodiment of the present invention.
  • FIG. 7 is a signaling diagram illustrating a UL carrier selection procedure for random access in a wireless communication according to the third embodiment of the present invention.
  • FIG. 8 is a flowchart illustrating steps of the UL carrier selection procedure that are performed in the UE according to the third embodiment of the present invention.
  • FIG. 9 is a block diagram illustrating a configuration of the eNB for supporting the random access method according to an embodiment of the present invention.
  • FIG. 10 is a block diagram illustrating a configuration of the UE for supporting the random access method according to an embodiment of the present invention.
  • LTE adopts Orthogonal Frequency Division Multiple Access (OFDMA) as a multiple access scheme to provide downlink peak rates of at least 100Mbps on the carrier bandwidth scalable up to 20 Mhz.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • AMC Adaptive Modulation and Coding
  • FIG. 1 is a schematic diagram illustrating a mobile communication system to which a random access method according to an embodiment of the present is applied.
  • the access networks of an LTE mobile communication system are composed of the base stations (hereinafter referred to interchangeably with “evolved Node B”, eNB, and Node B) 105, 110, 115, and 120, a Mobility Management Entity (MME), and a Serving-Gateway (S-GW).
  • the User Equipment (UE) 135 accesses an external network via one of the eNBs and S-GW 130.
  • Each of the eNBs 105, 110, 115, and 120 is an entity corresponding to a combination of a conventional Node B and a Radio Network Controller (RNC).
  • the UE 135 can access each eNB which performs the functions more complicate than those of the convention base station.
  • all the user traffic including real time data service such as Voice over IP (VoIP) is serviced over the shared channel. Accordingly, there is a need of a device for collecting feedback information and scheduling based on the feedback information, and the eNBs 105, 110, 115, and 120 are responsible for these functions.
  • Each eNB can have multiple cells.
  • the MME 125 is responsible for various control functions and connected to the eNBs 105, 110, 115, and 120.
  • CA Carrier Aggregation
  • FIG. 2 is a diagram illustrating a principle of carrier aggregation for a UE in an LTE-A system according to an embodiment of the present invention.
  • the eNB has the two available downlink (DL) carriers of center frequencies F1 and F4 201 and 221 and two available uplink (UL) carriers of center frequencies F2 and F5 211 and 231.
  • the UE can be allocated the DL carrier_1 201 and DL carrier_2 221 to receive data and the UL carrier_1 211 and UL carrier_2 231 to transmit data.
  • the eNB can allocate maximum available number of carriers to the UE supporting CA according to the channel conditions, resulting in increase the data rate of the UE.
  • the CA can be understood as the technique for a UE to transmit and receive data via multiple cells.
  • the peak data rate for a UE increases in proportion of a number of carriers aggregated.
  • the present invention proposes a method for selecting a UL carrier efficiently on which the CA-enabled UE performs random access.
  • the eNB configures RACH selection information for UE to select an uplink carrier for random access in consideration of the loads on the aggregated UL carriers including PRACH resources and sends the RACH selection information in the form of UE-specific signal or system information.
  • the RACH selection information includes a pathloss threshold and Probability Factors (PFs) of UL carriers.
  • the UE operating with aggregated UL carriers compares the measured pathloss value of a reference DL carrier linked to a reference UL carrier with the pathloss threshold.
  • the reference UL carrier can be the UL carrier linked to the reference or anchor DL carrier, or the eNB can notify the UE of a UL carrier explicitly by means of a UE-specific message or configures one of random access-available UL carriers which is capable of transmitting the RACH preamble most quickly as the UL carrier including PRACH resource.
  • the UE can check the time when the PRACH resource of each UL carrier is available on the time axis by referencing the PRACH resource allocation information on each UL carrier. With the PRACH resource allocation information, the UE can determine which UL carrier has the PRACH resource which can be most quickly used to transmit the RACH preamble.
  • the PRACH resource allocation information (e.g., PRACH-Config information specified in the 3GPP LTE standard TS36.331) can be transmitted in the system information or a UE-specific message.
  • the UE selects the UL carrier_1 having the PRACH resource which is capable of most quickly transmitting the RACH preamble as the reference UL carrier.
  • the UL carrier selection for random access can be performed in various ways but not limited to the aforementioned way.
  • the UE transmits the RACH preamble on the PRACH resource of the reference carrier. Otherwise, if the measured pathloss value of the (reference) DL carrier linked the reference UL carrier is (equal to or) greater than the pathloss threshold received from the eNB, the UE selects a UL carrier linked to the DL carrier of which measured pathloss has the least value.
  • the UE can select the UL carrier of the frequency bandwidth having the least center frequency.
  • the UE also can select the UL carrier having the PRACH resource which can most quickly transmit the RACH preamble among the random access-available UL carriers excluding reference UL carrier or the UL carrier of which corresponding DL carrier has the measured pathloss value (equal to or) less than the pathloss threshold received from the eNB.
  • the UE generates a random value (e.g., a value between 0 and 1) to the reselected UL carrier and compares the random value with the PF value corresponding to the UL carrier selected based on the RACH selection information received from the eNB.
  • the UE transmits the RACH preamble on the PRACH resource of the selected UL carrier. Otherwise, if the random value (equal to or) greater than the PF value, the UE cancels the candidacy of the UL carrier for random access and selects the UL carrier linked to the DL carrier of which pathloss is least, the UL carrier having the least center frequency, the UL carrier having the RACH resource which is able to most quickly transmit the RACH preamble, or the UL carrier of which linked DL carrier has the pathloss value (equal to or) less than the path loss threshold received from the eNB, among the rest DL carriers.
  • the UE when the random access is triggered to the UE using aggregated UL carriers available for random access, the UE selects the UL carrier having the PRACH resource which is capable of transmitting the RACH preamble most quickly among the UL carriers.
  • the UE can determine which UL carrier has the PRACH resource which can be most quickly used to transmit the RACH preamble based on the PRACH resource allocation information.
  • the eNB transmits the RACH selection information including the pathloss threshold value and PF values of individual UL carriers in a UE-specific message or system information. If a random access is triggered, the UE using the aggregated UL carriers having PRACH resource checks if the random access is triggered for a delay sensitive message/data transmission.
  • the UE identifies that the random access is triggered for the delay sensitive message/data transmission.
  • a specific Radio Bearer e.g., Signaling Radio Bearer_1 (SRB_1)
  • SRB_1 Signaling Radio Bearer_1
  • the UE identifies that the random access is triggered for the delay sensitive message/data transmission.
  • SRB_1 Signaling Radio Bearer_1
  • These specific logical channel/specific radio bearer/specific control messages can be fixedly predetermined according to the standard, or eNB can notify the UE that which logical channel/radio bearer/control message is dealt as the delay sensitive message/data by means of a UE-specific message or system information.
  • the UE selects the UL carrier having the PRACH resource which is capable of most quickly transmitting the RACH preamble and transmits the RACH preamble on the RACH resource of the selected URL carrier. If the random access is triggered for the transmission of non-delay sensitive data, the UE determines the UL carrier for random access by comparing the measured pathloss value of the (reference) DL carrier linked to the reference UL carrier. At this time, if it is determined that the reference UL carrier is not available for the random access, the UE selects the UL carrier of which the corresponding DL carrier has the least measured pathloss or which has the least center frequency and generates a random access.
  • the UE compares the random value with the PF value of the corresponding UL carrier to determine whether to perform random access on the selected UL carrier.
  • FIG. 3 is a signaling diagram illustrating a UL carrier selection procedure for random access in a wireless communication system according to the first embodiment of the present invention.
  • the eNB configures the RACH selection information including the pathloss threshold and PFs of the individual UL carriers that is necessary for the UE to select the UL carrier for random access, in consideration of the loads of the aggregated UL carriers having PRACH resources (301).
  • the eNB sends the RACH selection information to the corresponding UE by means of a dedicated signaling or system information (311).
  • the UE using the aggregated UL carriers with PRACH resource compares the measured pathloss value of the (reference) DL carrier linked to the reference UL carrier with the pathloss threshold contained in the RACH selection information (321).
  • the UE can select, as the reference UL carrier, the UL carrier linked to the reference or anchor DL carrier (implicit notification), the UL carrier notified explicitly by the eNB in a UE-specific message (explicit notification), or the UL carrier having the RACH resource which is capable of being used for most quickly transmitting the RACH preamble.
  • the UE can check the time when the PRACH resource of each UL carrier is available, based on the PRACH resource allocation information. Accordingly, the UE can determine which UL carrier has the PRACH resource capable of transmitting the PRACH preamble most quickly.
  • the PRACH resource allocation information e.g., PRACH-Config information specified in the 3GPP LTE standard TS36.331
  • the PRACH resource allocation information can be transmitted in the system information or a UE-specific message.
  • UL carrier_1 and UL carrier_2 are aggregated, and it is notified, by the PRACH resource allocation information of the UL carrier_1, that the UL carrier_1 has the PRACH resource after three subframe from the time point when the random access is triggered and it is notified, by the PRACH resource allocation information of the UL carrier_2, that the UL carrier_2 has the PRACH resource after 6 subframe from the time point when the random access is triggered; the UE selects the UL carrier_1 having the PRACH resource which is capable of most quickly transmitting the RACH preamble as the reference UL carrier.
  • the UL carrier selection for random access can be performed in various ways but not limited to the aforementioned way.
  • the UE sends the RACH preamble on the PRACH resource of the reference carrier (331).
  • the UE selects a UL carrier linked to the DL carrier of which measured pathloss has the least value, the UL carrier of the frequency bandwidth having the least center frequency, the UL carrier having the PRACH resource which can most quickly transmit the RACH preamble among the random access-available UL carriers excluding reference UL carrier, or the UL carrier of which corresponding DL carrier has the measured pathloss value (equal to or) less than the pathloss threshold received from the eNB.
  • the UE generates a random value (e.g., a value between 0 and 1) to the reselected UL carrier and compares the random value with the PF value corresponding to the UL carrier selected based on the RACH selection information received from the eNB (341).
  • a random value e.g., a value between 0 and 1
  • the UE transmits the RACH preamble on the PRACH resource of the selected UL carrier (351). Otherwise, if the random value (equal to or) greater than the PF value, the UE cancels the candidacy of the UL carrier for random access and selects the UL carrier linked to the DL carrier of which pathloss is least, the UL carrier having the least center frequency, the UL carrier having the RACH resource which is capable to most quickly transmit the RACH preamble, or the UL carrier of which linked DL carrier has the pathloss value (equal to or) less than the path loss threshold received from the eNB, among the rest DL carriers.
  • the UE generates a random value and compares the random value with the PF value corresponding to the selected UL carrier to determine whether to perform the random access on the reselected UL carrier.
  • FIG. 4 is a flowchart illustrating steps of the UL carrier selection procedure that are performed in the eNB according to the first embodiment of the present invention.
  • the eNB starts configuration of the RACH selection information necessary for a single UE using the aggregated UL carriers having PRACH resources to perform random access (401).
  • the eNB configures the RACH selection information including a pathloss threshold and Probability Factors (PFs) of individual UL carriers, in consideration of the load states of individual aggregated UL carriers, that is necessary for the UE to perform random access (411).
  • the eNB sends the RACH selection information to the corresponding UE in a dedicated signaling message or system information (421).
  • FIG. 5 is a flowchart illustrating steps of the UL carrier selection procedure that are performed in the UE according to the first embodiment of the present invention.
  • the UE compares the pathloss value of the (reference) DL carrier linked to the reference UL carrier with the pathloss threshold value (511).
  • the reference UL carrier can be the UL carrier linked to the reference or anchor DL carrier (implicit notification), the UL carrier notified explicitly by the eNB in a UE-specific message (explicit notification), or the UL carrier having the RACH resource which is capable of being used for most quickly transmitting the RACH preamble.
  • the UE can check the time when the PRACH resource of each UL carrier is available, based on the PRACH resource allocation information.
  • the PRACH resource allocation information e.g., PRACH-Config information specified in the 3GPP LTE standard TS36.331
  • the PRACH resource allocation information can be transmitted in the system information or a dedicated message.
  • UL carrier_1 and UL carrier_2 are aggregated, and it is notified, by the PRACH resource allocation information of the UL carrier_1, that the UL carrier_1 has the PRACH resource after three subframe from the time point when the random access is triggered and it is notified, by the PRACH resource allocation information of the UL carrier_2, that the UL carrier_2 has the PRACH resource after 6 subframe from the time point when the random access is triggered; the UE selects the UL carrier_1 having the PRACH resource which is capable of most quickly transmitting the RACH preamble as the reference UL carrier.
  • the UL carrier selection for random access according to the present invention can be performed in various ways but not limited to the aforementioned way.
  • the UE sends the RACH preamble on the PRACH resource of the reference carrier (531). That is, the UE perform random access on the reference UL carrier.
  • the UE selects a UL carrier linked to the DL carrier of which measured pathloss has the least value, the UL carrier of the frequency bandwidth having the least center frequency, the UL carrier having the PRACH resource which can most quickly transmit the RACH preamble among the random access-available UL carriers excluding reference UL carrier, or the UL carrier of which corresponding DL carrier has the measured pathloss value (equal to or) less than the pathloss threshold received from the eNB, and then generates a random value (e.g., a value between 0 and 1) to the reselected UL carrier (541).
  • the UE compares the random value with the PF value corresponding to the UL carrier selected based on the RACH selection information received from the eNB (543).
  • the UE transmits the RACH preamble on the PRACH resource of the selected UL carrier (561). That is, the UE performs a random access on the selected UL carrier. Otherwise, if the random value (equal to or) greater than the PF value at step 551, the UE cancels the candidacy of the UL carrier for random access (571). Next, the UE determines whether there is the UL carrier remained as a candidate for the random access (581).
  • the UE repeats steps 541 to 581. That is, the UE selects the UL carrier linked to the DL carrier of which pathloss is least, the UL carrier having the least center frequency, the UL carrier having the RACH resource which is capable to most quickly transmit the RACH preamble, or the UL carrier of which linked DL carrier has the pathloss value (equal to or) less than the path loss threshold received from the eNB, among the rest DL carriers; and generates a random value.
  • the UE compares the random value with the PF value corresponding to the selected UL carrier to determine whether to perform the random access on the reselected UL carrier. These steps are repeated until UE determines the UL carrier for random access or there is any UL carrier available for random access no more.
  • the UE transmits the RACH preamble on the PRACH resource of the reference UL carrier (591).
  • the UE can attempt the access to the network through steps 541 to 591, skipping steps 501 to 531.
  • FIG. 6 is a flowchart illustrating steps of the UL carrier selection procedure that are performed in the UE according to the second embodiment of the present invention.
  • the UE can attempt the random access without receiving specific information from the eNB.
  • the UE selects a UL carrier having the PRACH resource that is capable of being used to most quickly transmit the RACH preamble (611).
  • the UE sends the RACH preamble on the PRACH resource of the selected UL carrier (621). That is, the UE attempts the random access on the selected UL carrier.
  • the UE can identify the UL carrier of which PRACH resource is capable of being used to most quickly transmit the RACH preamble based on the PRACH resource allocation information.
  • the UE selects the UL carrier_1 having the PRACH resource which is capable of most quickly transmitting the RACH preamble as the reference UL carrier and performs the random access on the PRACH resource of the UL carrier_1.
  • the PRACH resource allocation information e.g., PRACH-Config information specified in the 3GPP LTE standard TS36.331
  • the UE selects the UL carrier_1 having the PRACH resource which is capable of most quickly transmitting the RACH preamble as the reference UL carrier and performs the random access on the PRACH resource of the UL carrier_1.
  • FIG. 7 is a signaling diagram illustrating a UL carrier selection procedure for random access in a wireless communication according to the third embodiment of the present invention.
  • the eNB configures the RACH selection information including the pathloss threshold and PFs of individual UL carriers that is necessary for the UE to select the UL carrier for random access, in consideration of the loads of the aggregated UL carriers having PRACH resources (701).
  • the eNB sends the RACH selection information to the corresponding UE by means of a dedicated signaling or system information (711).
  • the UE using the aggregated UL carriers with PRACH resources determines whether the random access is triggered for the transmission of delay sensitive message/data and, if it is, selects the UL carrier having the PRACH which is capable of most quickly transmitting the RACH preamble (721).
  • the UE sends the RACH preamble on the PRACH resource of the selected UL carrier (723).
  • the UE can identify the UL carrier of which PRACH resource is capable of being used to most quickly transmit the RACH preamble based on the PRACH resource allocation information as described with reference to FIG. 6.
  • the UE also can identify the delay sensitive message/data based on the logical channel at which the message/data is generated and the radio bearer on which the message/data is transmitted (e.g., Signaling Radio Bearer_1 (SRB_1)) and by regarding the measurement report control message that can trigger a handover or other handover-related control message as the delay sensitive message.
  • SRB_1 Signaling Radio Bearer_1
  • These specific logical channel/specific radio bearer/specific control messages can be fixedly predetermined according to the standard, or eNB can notify the UE that which logical channel/radio bearer/control message should be dealt as the delay sensitive message/data by means of a UE-specific message or system information. If the random access is triggered for the transmission of non-delay sensitive message/data, the UE performs steps 301 to 341 of FIG. 3 (731). Next, the UE sends the RACH preamble on the PRACH resource of the UL carrier selected according to the method described with reference to FIG. 3 (733).
  • the eNB performs operations for supporting the UL carrier selection procedure is identical with those described with reference to FIG. 4. A description is made of the operation of the UE with reference to FIG. 8.
  • FIG. 8 is a flowchart illustrating steps of the UL carrier selection procedure that are performed in the UE according to the third embodiment of the present invention.
  • the UE checks whether the random access is triggered for the transmission of delay sensitive message/data (811). For example, The UE also can identify the delay sensitive message/data based on the logical channel at which the message/data is generated and the radio bearer on which the message/data is transmitted (e.g., Signaling Radio Bearer_1 (SRB_1)) and by regarding the measurement report control message that can trigger a handover or other handover-related control message as the delay sensitive message.
  • SRB_1 Signaling Radio Bearer_1
  • the UE selects the UL carrier having the PRACH resource that is capable of being used to most quickly transmit the RACH preamble (821). Next, the UE performs random access on the selected UL carrier. Otherwise, if the random access is triggered for the transmission of non-delay sensitive message/data, the UE performs steps 511 to 591 of FIG. 5 (831).
  • FIG. 9 is a block diagram illustrating a configuration of the eNB for supporting the random access method according to an embodiment of the present invention.
  • the eNB 900 includes a radio resource manager 901, a message generator 911, and a radio transceiver 921.
  • the radio resource manager 901 checks the load states of individual UL/DL carriers and configures radio channel appropriately.
  • the message generator 911 generates the UE-specific message or system information containing a pathloss threshold and PF values of the individual carriers.
  • the radio transceiver 921 transmits the UE-specific message and system information to the cell/UE.
  • FIG. 10 is a block diagram illustrating a configuration of the UE for supporting the random access method according to an embodiment of the present invention.
  • the UE 1000 includes a radio transceiver 1001, a received signal analyzer/storage 1011, an upper layer entity 1021, a measurement unit 1301, and an RACH access executer 1041.
  • the UE receives the RACH selection information transmitted by the eNB 900 by means of the radio transceiver 1001.
  • the received information analyzer/storage 1011 analyzes the received RACH selection information.
  • the upper layer entity 1021 generates a message/data to be transmitted and, the RACH access executer 1041 attempts random access to the network.
  • the RACH access executer 1041 selects the UL carrier on which the random access is attempted using the logical channel ID with which the message/data is generated, radio bearer ID for transmitting the message/data, type of the transmission message, information on the message, and pathloss threshold and PF values provided by the received information analyzer/storage 1011, pathloss values of individual UL carriers that are measured by the measurement unit 1031, and the random value generated by the RACH access executor 1041.
  • the RACH access executor 1041 performs the random access on the selected UL carrier.
  • the random access method of the present invention facilitates selecting the UL carrier for the random access based on the RACH selection information provided by the eNB in a wireless communication system supporting UL carrier aggregation.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention porte sur un procédé d'accès aléatoire d'un équipement utilisateur (UE) dans un système de communication sans fil prenant en charge une agrégation de porteuses qui permet de transmettre des données sur de multiples porteuses. Un procédé d'accès aléatoire pour un système de communication sans fil prenant une agrégation de porteuses selon la présente invention consiste à recevoir, au niveau d'un terminal, des informations de sélection de canal d'accès aléatoire (RACH) nécessaires pour un accès aléatoire, les informations de sélection de RACH étant envoyées par une station de base ; sélectionner, lorsque l'accès aléatoire est déclenché, une porteuse de liaison montante sur laquelle l'accès aléatoire est tenté sur la base des informations de sélection de RACH ; et tenter l'accès aléatoire sur la porteuse de liaison montante sélectionnée.
PCT/KR2011/000175 2010-01-11 2011-01-11 Système de communication sans fil et son procédé d'accès aléatoire Ceased WO2011084033A2 (fr)

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KR10-2010-0002166 2010-01-11
KR20100002166 2010-01-11
KR1020100004801A KR101568139B1 (ko) 2010-01-11 2010-01-19 이동 통신 시스템 및 그 이동 통신 시스템에서 ｒａｃｈ 액세스 방법
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013113197A1 (fr) * 2012-02-01 2013-08-08 华为技术有限公司 Procédé d'accès sur un canal d'accès aléatoire physique, station de base et équipement usager
WO2014110925A1 (fr) * 2013-01-18 2014-07-24 中兴通讯股份有限公司 Procédé et appareil d'envoi, procédé et appareil de réception de séquence d'accès aléatoire
CN109309959A (zh) * 2017-07-27 2019-02-05 中兴通讯股份有限公司 用户设备、基站、信号传输方法及计算机可读存储介质

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7995967B2 (en) * 2004-03-09 2011-08-09 Neocific, Inc Methods and apparatus for random access in multi-carrier communication systems
EP2262341B1 (fr) * 2006-03-07 2016-11-02 Panasonic Corporation Réduction de surdébit de signalisation de commande d'une liaison montante dans un système de communication mobile

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013113197A1 (fr) * 2012-02-01 2013-08-08 华为技术有限公司 Procédé d'accès sur un canal d'accès aléatoire physique, station de base et équipement usager
US9439222B2 (en) 2012-02-01 2016-09-06 Huawei Technologies Co., Ltd. Method, base station, and user equipment for accessing physical random access channel
WO2014110925A1 (fr) * 2013-01-18 2014-07-24 中兴通讯股份有限公司 Procédé et appareil d'envoi, procédé et appareil de réception de séquence d'accès aléatoire
US9924546B2 (en) 2013-01-18 2018-03-20 Zte Corporation Method and device for sending and receiving random access sequence
CN109309959A (zh) * 2017-07-27 2019-02-05 中兴通讯股份有限公司 用户设备、基站、信号传输方法及计算机可读存储介质

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