WO2015013073A1 - Procédé et appareil destinés à une fenêtre de recherche de réponse d'accès aléatoire divisée en sous-fenêtres, pour la prolongation sans conflit et à faible complexité du temps de recherche de réponse d'accès aléatoire dans les hetnet avec n'importe quelle liaison terrestre - Google Patents

Procédé et appareil destinés à une fenêtre de recherche de réponse d'accès aléatoire divisée en sous-fenêtres, pour la prolongation sans conflit et à faible complexité du temps de recherche de réponse d'accès aléatoire dans les hetnet avec n'importe quelle liaison terrestre Download PDF

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Publication number
WO2015013073A1
WO2015013073A1 PCT/US2014/046799 US2014046799W WO2015013073A1 WO 2015013073 A1 WO2015013073 A1 WO 2015013073A1 US 2014046799 W US2014046799 W US 2014046799W WO 2015013073 A1 WO2015013073 A1 WO 2015013073A1
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WO
WIPO (PCT)
Prior art keywords
sub
window
windows
random access
preamble
Prior art date
Application number
PCT/US2014/046799
Other languages
English (en)
Inventor
Jan Johansson
Patrick Svedman
Yonghong Gao
Aijun Cao
Thorsten Schier
Bojidar Hadjiski
Original Assignee
Zte Wistron Telecom Ab
Zte (Tx) 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 Zte Wistron Telecom Ab, Zte (Tx) Inc. filed Critical Zte Wistron Telecom Ab
Publication of WO2015013073A1 publication Critical patent/WO2015013073A1/fr

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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
    • 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
    • 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 signaling, 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
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention is related to cellular telecommunication systems, such as heterogeneous networks where multiple low-power nodes are deployed within the coverage of a macro base station.
  • Heterogeneous Network In short, a new type of cellular communication system deployment, called Heterogeneous Network or HetNet in short, has been proposed, which is attracting a lot of interest and effort in the industry.
  • HetNet an additional tier including multiple low-power nodes (LPNs) is added into the cellular communication system within the coverage area of an existing macro base station, wherein the macro base station monitors, controls, and schedules communications with the LPNs in a master-slaves relationship in the HetNet in order to have better interference management and resource allocation, etc.
  • LPNs low-power nodes
  • one or more LPNs are deployed within a coverage area of one macro base station.
  • User equipment devices such as mobile devices rely on LPNs to establish their connections (e.g., uplinks) with the macro base station.
  • LPNs do not have unique cell IDs. Instead, the LPNs each share the same cell ID with the Macro station. By sharing cell IDs with the macro station, cell planning is simplified and handover procedures are not needed to move UEs between different LPNs and a macro station having the same cell ID.
  • UEs utilize random access procedures to establish connections with a network.
  • a UE transmits a preamble signal to the network.
  • the network generates a random access response (RAR) and transmits the RAR to the UE.
  • RAR random access response
  • the UE must receive the RAR within a predetermined time-frame, otherwise the UE assumes that the preamble has not been received by the network.
  • the time slots useable for preamble transmission, the length of the preamble, and the length of the predetermined time-window in which to expect a response are defined by the network.
  • the network response usually is sent from the same node in which the random access preamble is received, it is typically not a problem to meet the timing constraints of the RAR transmission.
  • HetNet systems it is possible that a preamble is received by a first node and a response must be generated at a second node, introducing a delay that can result in the response occurring outside the predetermined time-window.
  • FIG. 1 depicts an example of a system 100 configured for random access signaling.
  • a UE 104 is configured to communicate with a network 106.
  • the UE 104 may comprise, for example, a cellphone.
  • the network 106 may comprise, for example, a cellular communications system.
  • the UE 104 transmits a physical random access channel (PRACH) preamble 108a, 108b to a network 106.
  • PRACH physical random access channel
  • One or more time-slots available for transmission of a PRACH preamble 108a, 108b may be identified by the network prior to transmission of the preamble 108b.
  • PRACH physical random access channel
  • available time slots for transmission of a PRACH preamble 108a, 108b are defined by a system information block 2 (SIB2) available from the network 106.
  • SIB2 may further define, for example, the length of the PRACH preamble 108a, 108b.
  • the PRACH preamble 108a, 108b may comprise a length of 1, 2, or 3 sub-frames (e.g., 1ms, 2ms, or 3ms).
  • the SIB2 may be provided, for example, over a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • transmission of a preamble 108a may fail to reach the network 106, for example due to network interference.
  • the network 106 receives a preamble 108b from the UE 104 and generates a random access response (RAR) 110a, 110b.
  • the network 106 defines a predetermined response window in which the UE 104 can expect to receive the RAR 110a, 110b.
  • the RAR begins three sub-frames after the preamble 108b has been transmitted.
  • the response window may comprise any suitable number of sub-frames, such as, for example, 2, 3, 4, 5, 6, 7, 8, or 10 sub-frames.
  • a predetermined response window of 10 sub-frames is defined in the SIB2. If the UE 104 does not receive the RAR within the predetermined response window, the UE 104 assumes that the PRACH preamble 108a was not received by the network 106.
  • the UE 104 is configured to check each sub-frame of a transmission channel during the predetermined response window.
  • the UE 104 checks for a RAR in a physical downlink control channel (PDCCH).
  • the UE 104 checks for a RAR that has been scrambled by a random access radio network temporary identifier (RA-RNTI) associated with the PRACH preamble 108b transmission.
  • the RA-RNTI may be derived from the sub-frame number and frequency resources that the UE 104 uses to transmit the preamble 108b. If the UE 104 identifies a signal having the correct RA-RNTI, the UE 104 reads the downlink control information (DCI).
  • the DCI identifies the position of the RAR within the sub-frame, for example, within a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the UE 104 transmits user data 112 to the network over an uplink shared channel (UL-SCH) and/or a physical uplink shared channel (PUS CH) to generate a connection request.
  • the network allocates resources 114 for a contention resolution identity (CRI) over the PDCCH.
  • a contention resolution identity (CRI) 116 is provided to the UE over the PDSCH and/or a downlink shared channel (DL-SCH).
  • the provided CRI 116 is used for connection setup to establish a connection.
  • FIG. 2 depicts an example of a timing diagram 200 of the system 100 having one or more predetermined sub-frames, or occasions, 202a, 202b to transmit a preamble and
  • a first search window 204 is associated with a preamble transmission during a first preamble sub-frame 202a and a second search window is associated with a preamble transmission during a second preamble sub-frame 202b.
  • a first predetermined response reception window 204 begins three sub-frames following the transmission of the preamble by the UE 104 during a first preamble sub-frame 202a.
  • the first predetermined response window 204 comprises 10 total sub-frames beginning three sub-frames after transmission of a preamble.
  • the UE 104 retransmits a preamble to the network 106.
  • the UE 104 may re-transmit the preamble during a second predetermined preamble sub-frame 202b and search for the RAR during the second predetermined response reception window 206.
  • the UE 104 will wait for one or more additional pre-amble sub-frames to re-transmit the preamble.
  • a second UE may transmit a preamble and search for a RAR during a second predetermined response windowv 206.
  • FIG. 3 depicts an example of a RAR transmission outside of a predetermined response window.
  • a first UE transmits a PRACH preamble-to the network.
  • the preamble is illustrated as requiring a single frame, it will be recognized that a preamble may comprise multiple sub-frames.
  • a preamble may comprise one, two, or three sub-frames.
  • the length of the preamble may be defined by the network, for example, in SIB2.
  • the first UE checks for a RAR having a RA-RNTI matching the sub-frame number and frequency resources used by the first UE 302a to transmit the PRACH Preamble-during a first response window 304.
  • the network fails to transmit the RAR to the first UE in the first predetermined response window 304.
  • a second UE transmits a PRACH preamble-to the network during a second preamble frame 302b. The second UE transmits the second PRACH preamble-using a sub-frame number and frequency resources that generate the same RA-RNTI as generated by the first preamble.
  • the second UE checks for a RAR having a RA-RNTI matching the sub -frame number and frequency resources used by the second UE during the second preamble frame 302b to transmit the second PRACH Preamble during a second response window 306. However, during that time, the network transmits the RAR for the first UE instead.
  • the second UE detects a RAR having an RA-RNTI matching the PRACH preamble-transmitted by the second UE, but is actually receiving a RAR intended for the first UE.
  • the second UE experiences contention when receiving a RAR with a matching RA-RNTI but that was intended for the first UE.
  • the RAR is usually sent from the same node that also received the preamble. Therefore, there is also usually enough time for the network to send the RAR within the predetermined response windw.
  • the predetermined response windows are in this case long enough to avoid contention as illustrated in FIG. 3.
  • a PRACH preamble may be received in one node, such as, for example, a low-power node, while the RAR response is generated at a second node, such as a macro node. Transmission of information from the first node that receives the PRACH to the second node that transmits the RAR may introduce delays that cause the RAR response to be transmitted outside of the predetermined response window.
  • FIG. 4 depicts an example of a HetNet cellular communication system 400 configured for random access signaling by multiple nodes.
  • the system 400 comprises a macro base station 402 having a coverage area 404.
  • At least one low-power node 406 (LPN) is located within the coverage area 404 of the macro station 402.
  • the LPN 406 comprises an asymmetric uplink/downlink (UL/DL) coverage.
  • An uplink (UL) coverage area 408 of the LPN 406 is wider than a symmetric uplink/downlink (UL/DL) coverage area 410.
  • a UE 412 may be located within the UL coverage area 408 of the LPN 406 but outside of the DL coverage area 410.
  • a preamble transmitted by the UE 412 is received by the LPN 406.
  • the UE 412 is outside of the LPN 406 symmetric UL/DL coverage area 410. Therefore, the RAR response must be transmitted by the macro station 402.
  • the LPN 406 must provide the received preamble to the macro node 402.
  • the LPN 406 transmits the raw preamble and/or information obtained from the preamble to the macro node 402 over a backhaul network 414.
  • the backhaul network 414 has a backhaul delay. The backhaul delay may add a delay to the transmission of the RAR response such that it is impossible for the RAR response to be transmitted within the predetermined response window.
  • FIG. 5 depicts an example of a HetNet cellular communication system 500 comprising a macro node 502 configured to generate a RAR.
  • the system 500 comprises a macro base station 502 having a coverage area 504.
  • At least one LPN 506 is located within the coverage area 504.
  • the LPN comprises a symmetric UL/DL coverage areas 508.
  • a UE 512 is located within the UL/DL coverage area 508 of the LPN 506.
  • a PRACH preamble is transmitted by the UE 512 to the LPN 506.
  • the UE 512 is within the UL/DL coverage area 508 of the LPN 506.
  • the network decides not to transmit the RAR from the LPN 506.
  • the cell specific refereice signal (CRS)T is only transmitted from the macro node 502.
  • a CRS is required to decode the PDCCH and the PDSCH. Without a CRS, the UE 512 cannot read the RAR. Therefore, the macro node 502 must transmit all RARs within the coverage area 504.
  • the LPN 506 transmits the received raw preamble and/or information obtained from the preamble to the macro node 502 via the backhaul network 514. Similar to the system 400 of FIG. 4, the backhaul network 514 introduces a backhaul delay that makes it impossible for the RAR to be transmitted within the predetermined response window.
  • a predetermined response window for searching for a random access response is divided into two or more sub-windows.
  • User equipment is configured to search each of the sub-windows for the RAR response.
  • the two or more sub-windows are divided by a delay and may comprise non-consecutive search windows.
  • the sub-windows are selected such that the sub-windows of a first predetermined response window do not overlap with the sub-windows of a second predetermined response window.
  • the two or more sub-windows and the delay are configured to compensate for one or more backhaul delays between low-power nodes and a macro node.
  • FIG. 1 depicts an example of a system configured for random access signaling.
  • FIG. 2 depicts an example of a timing diagram of the system of FIG. 1 having predetermined time-windows for transmitting a random access response from a network to the UE.
  • FIG. 3 depicts an example of a RAR transmission outside of a predetermined response window
  • FIG. 4 depicts an example of a HetNet communication system configured for random access signaling.
  • FIG. 5 depicts an example of preamble reception at a low-power node and random access response transmission from a macro node in a cellular communication system.
  • FIG. 6 depicts an example of a HetNet communication system configured to transmit random access responses to a plurality of user equipment. [With respect to “ble” in the figure, it is an artifact from the removal of the word “preamble” from one section and will be removed in the formal figures]
  • FIG. 7 depicts an example of a timing diagram for the system of FIG. 6.
  • the present invention is directed toward systems and methods for a cellular or mobile communication system.
  • Embodiments of the invention are described herein in the context of one practical application, namely, communication between a macro base station and a plurality of UEs/mobile devices via a plurality of LPNs.
  • the example system is applicable to provide data communications between the macro base station and the plurality of mobile devices through the LPNs.
  • the invention is not limited to such base station and mobile device communications applications, and the methods described herein may also be utilized in other applications such as mobile-to-mobile communications, wireless local loop communications, wireless relay communications, or wireless backhaul communications, as non-limiting examples.
  • RAR contention and backhaul delay issues can be eliminated from the systems 400, 500 (Figs. 4 and 5, respectively) by splitting the predetermined response window into a plurality of sub-windows, or fragments. One or more of the sub-windows are delayed, such that the plurality of sub-windows are not contiguous.
  • a UE may check for an RA-RNTI during a first sub-window, wait a predetermined delay, and check for the RA-RNTI during a second sub-window.
  • the predetermined response window may be divided into any number of sub-windows each comprising their own delay. The total number of sub-frames searched during the sub- windows is equal to the number of sub-frames of the predetermined response window.
  • FIG. 6 depicts an example of a HetNet communication system 600 configured to transmit random access responses to a plurality of user equipment, in accordance with one embodiment of the invention.
  • the system 600 comprise a macro node 602 having a coverage area 604.
  • At least one LPN 606 is located within the coverage area 604 of the macro node 602.
  • the LPN 606 has a symmetrical UL/DL coverage area 608.
  • a first UE 612a and a second UE 612b are located within the UL/DL coverage area 608 of the LPN 606.
  • a third UE 612c is located within the coverage area 604 of the macro node 602, but outside the coverage area 608 of the LPN 606.
  • the preamble is received by the LPN 606.
  • the raw preamble and/or information obtained from the preamble is provided from the LPN 606 to the macro node 602 over the backhaul network 614.
  • the backhaul network 614 introduces a backhaul delay.
  • the backhaul delay affects transmission of RARs to the first and second UEs 612a, 612b from the macro node 602. If the backhaul delay is significant, the RAR may not be transmitted within a predetermined response window.
  • a predetermined response window is divided into a plurality of sub-windows.
  • the size and number of sub-windows may be defined by the network 600, for example, in the SIB2.
  • At least one sub-frame offset "k" is provided by the SIB2. If the value of "k" is not provided, the predetermined response window is not divided into sub-windows.
  • the offset k defines a delay between one or more of the sub-windows.
  • the start of a first sub-window may be three sub-frames after the preamble transmission (identical to traditional LTE).
  • the first sub-window comprises a first number of sub-frames. After searching the first number of sub-frames, the search is delayed for delay period k.
  • a starting sub-frame of a second sub-window may be calculated as the last sub-frame for the first sub-window plus k. Additional sub-windows may be defined. The additional sub-windows may comprise the same offset, k and/or may have a separate offset value.
  • the predetermined response window is split into a first sub-window and a second sub-window.
  • the length of the second sub-window may be derived implicitly from the length of the first sub-window.
  • the length of the second sub-window may be the maximum allowed response window length minus the length of the first sub-window.
  • the sub-frame offsets and sub-window lengths can be configured such that a late RAR due to a long backhaul delay (and/or other delays) can be received by the target UE without having overlapping search windows.
  • the use of sub-windows lowers the probability of contention.
  • the backhaul delay, D may be equal to 13ms.
  • the RAR predetermined response window is 10ms. Therefore, it is not possible for the RAR to be transmitted by the macro node 602 within the RAR predetermined response window.
  • the UE can generate RAR search windows that extend the EU search time for a RAR and are non-overlapping for the same RA-RTNI.
  • the predetermined response window is sub-divided into a first sub-window comprising a length of 3ms, a second sub-window comprising a length of 7ms, and a sub-frame offset of 10.
  • the first UE 612a and the second UE 612b are configured to divide the predetermined response window into a plurality of sub-windows. For example, the first UE 612a transmits a preamble to the LPN 606. The first UE 612a searches for an RAR response having an RA-RNTI matching the PRACH preamble transmission during a first sub-window equal to a number of sub-frames less than a predetermined response window. The first UE 612a then waits a predetermined delay, k. After the delay k, the first UE 612a resumes searching during a second sub-window. The second sub-window may equal a number sub-frames equal to the predetermined response window minus the number of sub-frames in the first sub-window.
  • FIG. 7 depicts an example of a timing diagram 700 for the system 600 illustrated in FIG. 6, in accordance with one embodiment of the invention.
  • a first UE 612a transmits a PRACH preamble 616a in a first preamble sub-frame 702a.
  • the first UE 612a waits three sub-frames and begins searching for a first RAR 618a during a first response sub-window 704a.
  • the first response sub-window 704a comprises three sub-frames. Because the first UE 612a is located within the LPN 606 coverage area 608, the preamble 616a must be provided by the LPN 606 to the macro node 602 over the backhaul network 614.
  • the first RAR 618a is delayed beyond the first response sub-window 704a.
  • the first UE 612a stops searching and waits a predetermined delay period, for example, 10 milliseconds (or 10 sub-frames).
  • a predetermined delay period for example, 10 milliseconds (or 10 sub-frames).
  • the first UE 612a resumes searching for the first RAR 618a in the second sub-window 704b.
  • the first RAR 618a is transmitted by the macro node 602 during the second sub-window 704b.
  • the predetermined delay may be generated based on, for example, the delay of the backhaul network 614 and selected such a UE 612a within the LPN 606 coverage area 608 is likely to receive an RAR during the second sub-window 704b.
  • a second UE 612b transmits a PRACH Preamble 616b in a second preamble sub-frame 702b.
  • the second UE 612b begins searching for a second RAR 618b during a first response sub-window 706a.
  • the second preamble sub-frame is selected such that the first response sub-window 706a for the second UE 612b occurs during the predetermined delay period of the first UE 612a.
  • the delay period is 10 milliseconds.
  • the second UE 612b transmits a PRACH preamble 616a 10 milliseconds after the first UE 612a.
  • the second UE 612b searches for a second RAR in a first response sub-window 706a.
  • the first response sub- window 706a for the second UE 612b occurs prior to the second response sub- window 704b for the first UE 612a. Because the second UE 612b is located within the LPN 606 coverage area 608, the PRACH preamble 616b must be provided to the macro node 602 over the backhaul network 614. The second RAR 618b is delayed beyond the first response sub-window 706a. The second UE 612b stops searching at the end of the first sub-window 706a and waits the predetermined delay. The second UE 612b resumes searching during a second response sub-window 706b and identifies the second RAR 618b during the second response sub-window 706b.
  • a third UE 612c transmits a PRACH preamble during a third preamble sub-frame 702c.
  • the third UE 612c begins searching for a third RAR 620 within a first response sub-window 708, which occurs three sub-frames after the transmission of the preamble 702c.
  • the third UE 612c is located within the macro node 602 coverage area 604. Because the third UE 612c is within coverage area 604, the PRACH preamble is received by the macro node 602, and a third RAR response 620 can be generated by the macro node 602 without transmission over the backhaul network 614.
  • the third RAR response 620 is transmitted during the first search sub-window 708.
  • the third UE 612c does not search in a second response sub-window (not shown), as the UE 612c has already received the third RAR 620. As shown, the third UE 612c receives the third RAR 620 prior to the second UE 612b, even though the second UE 612b transmitted a preamble first.
  • the system 600 compensates for backhaul delays between an LPN 606 and a macro node 602.
  • the system 600 reduces contention and generates sub-windows that are non-overlapping for the same RA-RNTI.
  • the system 600 comprises a single LPN 606 and splitting the response window into two sub-windows is sufficient to compensate for the single backhaul delay.
  • the backhaul delays between each of the LPNs and the macro node may be different. If the backhaul delay between each LPN and the macro node cannot be covered within the length of one search-sub-window, the response window may be split into three or more sub-windows.
  • multiple backhaul delays between the plurality of LPNs and the macro node are introduced.
  • the response window is fragmented into a plurality of sub-windows.
  • the number of sub-windows needed is the number of backhaul delays + 1.
  • Each of the sub-windows may be delayed by a time period substantially equal to a corresponding backhaul delay for transmission between an LPN and the macro node.
  • a UE is configured to split a predetermined response window into a plurality of sub-windows based on one or more parameters received from the network.
  • the length of the sub- windows may be signaled directly, for example, in the SIB2, and/or may be derived by the UE.
  • the length of the sub-windows is derived based on the backhaul delay between one or more LPNs and a macro node.
  • module refers to software that is executed by one or more processors, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Additionally, for purpose of discussion, the various modules are described as discrete modules; however, as would be apparent to one of ordinary skill in the art, two or more modules may be combined to form a single module that performs the associated functions according embodiments of the invention.
  • one or more of the functions described in this document may be performed by means of computer program code that is stored in a "computer program product”, “computer-readable medium”, and the like, which is used herein to generally refer to media such as, memory storage devices, or storage unit.
  • a "computer program product”, “computer-readable medium”, and the like which is used herein to generally refer to media such as, memory storage devices, or storage unit.
  • Such instructions may be referred to as "computer program code” (which may be grouped in the form of computer programs or other groupings), which when executed, enable the computing system to perform the desired operations.

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

Cette invention propose une nouvelle approche de la signalisation de l'accès aléatoire pour la mise en place d'un HetNet. Tout d'abord, une fenêtre de réponse prédéfinie permettant de rechercher une réponse d'accès aléatoire (RAR) est divisée en un minimum de deux sous-fenêtres. Un équipement utilisateur (UE) est conçu pour explorer chacune des sous-fenêtres à la recherche de la réponse RAR. Les deux sous-fenêtres minimum sont divisées par un retard. Les sous-fenêtres sont sélectionnées de manière à ce que celles d'une première fenêtre de réponse prédéfinie ne chevauchent pas celles d'une seconde fenêtre de réponse prédéfinie. Les deux sous-fenêtres minimum et le retard sont prévus pour compenser un ou plusieurs retards de liaison terrestre entre des nœuds à faible puissance et un nœud macro.
PCT/US2014/046799 2013-07-22 2014-07-16 Procédé et appareil destinés à une fenêtre de recherche de réponse d'accès aléatoire divisée en sous-fenêtres, pour la prolongation sans conflit et à faible complexité du temps de recherche de réponse d'accès aléatoire dans les hetnet avec n'importe quelle liaison terrestre WO2015013073A1 (fr)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017097582A1 (fr) * 2015-12-09 2017-06-15 Nokia Solutions And Networks Oy Amélioration d'accès aléatoire destinée à un accès sans licence
WO2017132849A1 (fr) * 2016-02-03 2017-08-10 Telefonaktiebolaget Lm Ericsson (Publ) Dispositif sans fil, premier nœud d'accès et procédés correspondants
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WO2017097582A1 (fr) * 2015-12-09 2017-06-15 Nokia Solutions And Networks Oy Amélioration d'accès aléatoire destinée à un accès sans licence
WO2017132849A1 (fr) * 2016-02-03 2017-08-10 Telefonaktiebolaget Lm Ericsson (Publ) Dispositif sans fil, premier nœud d'accès et procédés correspondants
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WO2019161044A1 (fr) * 2018-02-14 2019-08-22 Idac Holdings, Inc. Accès aléatoire dans un réseau non terrestre
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CN113647184B (zh) * 2019-03-28 2022-11-15 中兴通讯股份有限公司 用于执行增强型随机接入过程的方法、装置及介质

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