WO2011020269A1 - Procédé et dispositif d’accès aléatoire pour système d’évolution à long terme - Google Patents

Procédé et dispositif d’accès aléatoire pour système d’évolution à long terme Download PDF

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Publication number
WO2011020269A1
WO2011020269A1 PCT/CN2009/075583 CN2009075583W WO2011020269A1 WO 2011020269 A1 WO2011020269 A1 WO 2011020269A1 CN 2009075583 W CN2009075583 W CN 2009075583W WO 2011020269 A1 WO2011020269 A1 WO 2011020269A1
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WO
WIPO (PCT)
Prior art keywords
random access
aggregated carrier
uplink
downlink
carrier group
Prior art date
Application number
PCT/CN2009/075583
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English (en)
Chinese (zh)
Inventor
魏巍
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中兴通讯股份有限公司
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Publication of WO2011020269A1 publication Critical patent/WO2011020269A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management

Definitions

  • the present invention relates to the field of communications, and in particular to a random access method and apparatus for a long term evolution system. Background technique
  • Carrier aggregation is a key technology for supporting larger bandwidth in future wireless communication systems. It aggregates different carriers to form a carrier with a larger bandwidth, and supports a user terminal with a stronger capability on the aggregated bandwidth (User Terminal, UT ), for example, a bandwidth exceeding 100 MHz in LTE-Advanced.
  • the carrier of the uplink and the downlink is asymmetric when the carrier is aggregated, and in the case of the asymmetric carrier, all the components must be required.
  • Backward compatibility can support user access of all bandwidth capabilities. Therefore, the resource scheduling of the base station (BS) has a large limitation.
  • BS base station
  • the path carrier allocates more resources, which easily leads to loss of virtual alarm and false detection performance, and the resource request on the uplink component carrier brings an increase in overhead. Summary of the invention
  • the present invention aims to provide a random access method for a long-term evolution system, which can solve the problem that a user terminal that requires all component carriers to be backward compatible to support all bandwidth capabilities in the case of an asymmetric carrier, resource scheduling of the base station There is a large limitation. In order to distinguish the downlink carrier corresponding to the uplink carrier, more resources must be allocated for the uplink carrier, resulting in loss of false alarm and false detection performance, and on the uplink component carrier. Resource requests bring an increase in overhead.
  • a random access method for a long term evolution system including the following steps: a base station according to a bandwidth capability of all user terminals that need to be supported, and an aggregate carrier for an uplink Performing grouping to obtain an uplink aggregated carrier group; the base station sets a downlink aggregated carrier group corresponding to the uplink aggregated carrier group, and the downlink aggregated carrier group and the uplink aggregated carrier group form an aggregated carrier pair; The physical random access channel parameters of the aggregated carrier pair are then performed, and then access is performed according to the determined physical random access channel parameters.
  • the determining, by the base station, the random access channel parameter of the aggregated carrier pair comprises: receiving, by the base station, a random access request message from the first user terminal; and determining, by the base station, the bandwidth capability of the first user terminal
  • the uplink aggregation aggregation carrier group corresponds to the first downlink aggregation carrier group; the base station transmits a random access response message on the first downlink aggregation carrier group, and the random access response message includes a physical random access channel parameter.
  • the physical random access channel parameters include time, frequency, and code resources.
  • each uplink aggregated carrier group corresponds to a user terminal having similar bandwidth capability.
  • the base station enters the correspondence between the uplink aggregated carrier group and the downlink aggregated carrier group according to the current environment and the load condition of the wireless communication network.
  • Line semi-static configuration the base station enters the correspondence between the uplink aggregated carrier group and the downlink aggregated carrier group according to the current environment and the load condition of the wireless communication network.
  • the downlink aggregated carrier group includes a downlink aggregated carrier.
  • the downlink aggregated carrier group includes a plurality of downlink aggregated carriers.
  • a random access apparatus for a long term evolution system including: a packet module, configured, by a base station, according to a bandwidth capability of all user terminals supported by the base station, The aggregated carrier of the path is grouped to obtain an uplink aggregated carrier group, and the setting module is configured to set, by the base station, a downlink aggregated carrier group corresponding to the uplink aggregated carrier group, and the downlink aggregated carrier group and the uplink aggregation
  • the carrier group forms an aggregated carrier pair;
  • the parameter module is configured to determine, by the base station, a physical random access channel parameter of the aggregated carrier pair; and the access module is configured to perform access according to the physical random access channel parameter determined by the parameter module.
  • the parameter module specifically includes: a receiving unit, configured to receive, by the base station, a random access request message from the first user terminal; and a corresponding unit, configured to determine, by the base station, the bandwidth capability of the first user terminal a first downlink aggregated carrier group corresponding to the corresponding uplink aggregated carrier group; a response unit, configured to send, by the base station, a random access response message, a random access response message, on the first downlink aggregated carrier group Includes physical random access channel parameters.
  • the foregoing random access device further includes: a configuration module, configured to perform semi-static configuration on the correspondence between the uplink aggregated carrier group and the downlink aggregated carrier group according to the current environment and the load condition of the wireless communication network.
  • a configuration module configured to perform semi-static configuration on the correspondence between the uplink aggregated carrier group and the downlink aggregated carrier group according to the current environment and the load condition of the wireless communication network.
  • the present invention is directed to a random access method and apparatus for a long term evolution system.
  • the uplink aggregated carriers are grouped, and then the downlink corresponding to the uplink aggregated carrier group is set.
  • the method comprises: aggregating a carrier group, and finally determining a physical random access channel parameter of the aggregated carrier pair formed by the uplink aggregated carrier group and the downlink aggregated carrier group, so that the base station only needs to use the random access to the user terminal User terminal pair
  • the specific downlink aggregation carrier group should not occupy other downlink carrier resources, which reduces the occupation of channel resources in the physical random access process, helps suppress false alarms and improves detection performance, thereby improving the carrier.
  • FIG. 1 is a flow chart showing a random access method according to a first embodiment of the present invention
  • FIG. 2 is a flow chart showing a random access method according to a second embodiment of the present invention
  • FIG. 1 is a flow chart showing a random access method according to a first embodiment of the present invention. As shown in FIG. 1, the method includes the following steps:
  • Step S102 The BS groups the uplink aggregate carriers according to the bandwidth capabilities of all the UTs that need to be supported, to obtain an uplink aggregated carrier group.
  • Step S104 The BS sets a downlink aggregated carrier group corresponding to the uplink aggregated carrier group, and the downlink aggregated carrier group and the uplink aggregated carrier group form an aggregated carrier pair.
  • Step S106 The BS determines a physical random access channel parameter of the aggregated carrier pair.
  • Step S108 The BS performs access according to the determined physical random access channel parameter.
  • the uplink aggregated carriers are first grouped according to the bandwidth capabilities of all UTs that need to be supported, and then the downlink aggregated carriers corresponding to the uplink aggregated carrier groups are set. And determining, by the group, the physical random access channel parameters of the aggregated carrier pair formed by the uplink aggregated carrier group and the downlink aggregated carrier group, where the BS needs to determine the bandwidth capability of all the UTs that need to be supported in the wireless communication network, Understand the bandwidth capabilities of the UTs currently supported in the wireless communication system to determine the aggregated carrier conditions that need to be supported during the random access procedure.
  • the BS only needs to utilize a specific downlink aggregated carrier group corresponding to the UT when performing random access to the UT, without occupying other downlink carrier resources, and reducing channel resources in the physical random access process.
  • the occupation can help suppress false alarms and improve detection performance, thereby improving the utilization of carrier resources and the efficiency of random access. Therefore, in the case of asymmetric carriers, all component carriers are required to be backward compatible to support all.
  • the resource scheduling of the BS has a large limitation. In order to distinguish the downlink carrier corresponding to the uplink carrier, more resources must be allocated for the uplink carrier, resulting in false alarm and false detection performance. The loss, and the resource request on the uplink component carrier brings about an increase in overhead.
  • step S106 specifically includes: the BS receives a random access request message from the UT; and the BS determines a downlink aggregated carrier corresponding to the uplink aggregated carrier group that matches the UT bandwidth capability.
  • the BS transmits a random access response message on the downlink aggregated carrier group, and the random access response message includes a physical random access channel parameter.
  • the BS in this embodiment determines the bandwidth capability of the UT in the wireless communication network.
  • the BS sets one or more downlink component carrier groups, and each downlink component carrier group and one or several The UT bandwidth capability uplink carriers are matched, and each downlink (DL) group is configured to set a random access response message.
  • the BS receives the UT random access request, the BS only Transmitting a random access response message on a downlink component carrier group matched with an uplink carrier that matches the current UT bandwidth capability, and broadcasting different physical random access channel parameters when the preamble message transmitted by the BS is unchanged Learn more about the bandwidth capabilities of the UT.
  • the BS For the physical random access channel, the BS only detects the downlink carrier that the UT can listen to, and at the same time, only sends a random access response message on the corresponding downlink carrier, which The problem of excessive occupation of channel resources in the process of physical random access is solved.
  • the physical random access channel parameters include time, frequency and code resources, thereby obtaining more bandwidth capability information of the UT.
  • each uplink aggregated carrier group corresponds to a UT having similar bandwidth capability.
  • the same uplink resources are used, and the new resources formed after the aggregation are completely backward compatible.
  • the BS performs semi-static configuration on the correspondence between the uplink aggregated carrier group and the downlink aggregated carrier group according to the current environment and the load condition of the wireless communication network.
  • Corresponding relationship between the uplink aggregation carrier group and the downlink aggregation carrier group, including how the uplink carrier resources correspond to different downlink carriers, the correspondence may be fixed, or may be performed by the BS.
  • this embodiment is a case where the BS performs semi-static configuration, that is, the BS increases or decreases the downlink component carrier group corresponding to the uplink carrier according to the change of the wireless communication network environment and the load condition, so that the physical random connection
  • the inbound channel resources can be completely controlled within a reasonable range, thereby effectively reducing the complexity of the BS scheduling and the resource overhead occupied by the parameters that the physical random access channel needs to bear.
  • the downlink aggregated carrier group includes a downlink aggregated carrier.
  • the carrier resources of a corresponding component carrier group of the asymmetric uplink and the downlink can be respectively accommodated, thereby ensuring the backward compatibility performance of the wireless communication network.
  • the downlink aggregated carrier group includes a plurality of downlink aggregated carriers.
  • the present embodiment can accommodate different capabilities of UT random access by setting carrier resources of a plurality of corresponding component carriers of the asymmetric uplink and downlink, respectively, and ensuring backward compatibility performance of the wireless communication network.
  • the BS performs access according to an existing access mode.
  • 2 is a flow chart showing a random access method according to a second embodiment of the present invention. As shown in FIG. 2, the method includes the following steps:
  • Step S202 the BS determines the bandwidth capability of all the UTs that need to be supported in the wireless communication network.
  • Step S204 The BS groups the uplink aggregated carriers according to the bandwidth capability of the UT.
  • Step S206 The BS sets the downlink aggregated carrier or carrier group. Corresponding to the uplink aggregated carrier group;
  • Step S208 The BS determines physical random access channel parameters of the uplink and downlink aggregated carrier pairs.
  • Step S210 The BS performs access according to the determined physical random access channel parameter.
  • FIG. 3 is a structural diagram of a random access device according to a third embodiment of the present invention. As shown in FIG. 3, the device includes:
  • the grouping module 302 is configured to: the BS aggregates the aggregated carriers of the uplink according to the bandwidth capability of all the UTs that need to be supported, to obtain an uplink aggregated carrier group;
  • the setting module 304 is configured to set, by the BS, a downlink aggregated carrier group corresponding to the uplink aggregated carrier group, where the downlink aggregated carrier group and the uplink aggregated carrier group form an aggregated carrier pair; and the parameter module 306 is used for the BS.
  • the physical random access channel parameter of the aggregated carrier pair is determined; the access module 308 is configured to perform access by the BS according to the physical random access channel parameter determined by the parameter module.
  • the packet module 302 firstly groups the uplink aggregated carriers according to the bandwidth capabilities of all the UTs that need to be supported, and then uses the setting module 304 to set the downlink aggregated carrier corresponding to the uplink aggregated carrier group.
  • the group, the last parameter module 306 determines the physical random access channel parameters of the aggregated carrier pair formed by the uplink aggregated carrier group and the downlink aggregated carrier group, so that the BS only needs to perform random access to the UT.
  • the specific downlink aggregated carrier group corresponding to the UT is used without occupying other downlink carrier resources, which reduces the occupation of channel resources in the physical random access process, and helps to suppress false alarms and improve detection. Performance, thereby improving the utilization of carrier resources and the efficiency of random access.
  • the parameter module 306 specifically includes: a receiving unit, configured to receive, by the BS, a random access request message from the first UT; and a corresponding unit, configured to determine, by the BS, the bandwidth capability of the first UT a first downlink aggregated carrier group corresponding to the uplink aggregated carrier group; a response unit, configured to transmit, by the BS, a random access response message on the first downlink aggregated carrier group, where the random access response message includes Physical random access channel parameters.
  • the BS in this embodiment determines the bandwidth capability of the UT in the wireless communication network.
  • the BS sets one or more downlink component carrier groups, and each downlink component carrier group and one or several The UT bandwidth capability uplink carriers are matched, and each DL component carrier group is provided with a random access response message.
  • the BS receives the UT random access request, the BS only matches the current UT bandwidth capability.
  • the downlink carrier-matched downlink component transmits a random access response message on the carrier group, and broadcasts different physical random access channel parameters to obtain more UT bandwidth capability if the preamble message transmitted by the BS is unchanged. information.
  • the BS only detects the downlink carrier that the UT can listen to, and only sends the random access response message on the corresponding downlink carrier, thus solving the channel resource occupation in the physical random access process. Too big a problem.
  • the foregoing random access device further includes: a configuration module, configured to perform semi-static configuration on the correspondence between the uplink aggregated carrier group and the downlink aggregated carrier group according to the current environment and the load condition of the wireless communication network. Correspondence between the uplink aggregated carrier group and the downlink aggregated carrier group, including how the uplink carrier resources are opposite to different downlink carriers
  • the correspondence may be fixed or semi-statically configured by the BS. This embodiment is a case where the BS performs semi-static configuration, that is, the BS increases or decreases according to changes in the wireless communication network environment and load conditions.
  • the downlink corresponding to the uplink carrier constitutes a carrier group, so that the physical random access channel resources can be completely controlled within a reasonable range, thereby effectively reducing the complexity of the BS scheduling and the physical random access channel needs to be carried.
  • the foregoing embodiment of the present invention reduces the occupation of channel resources in the physical random access process, helps suppress false alarms, and improves detection performance, thereby improving utilization of carrier resources and The efficiency of random access.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

Abstract

L’invention concerne un procédé et un dispositif d’accès aléatoire destinés à un système d’évolution à long terme. Le procédé comprend les étapes suivantes: selon les capacités de bande passante de tous les terminaux d’utilisateurs nécessitant un support, grouper les porteuses d’agrégation de liaisons montantes pour obtenir des groupes de porteuses d’agrégation de liaisons montantes; établir des groupes de porteuses d’agrégation de liaisons descendantes correspondant aux groupes de porteuses d’agrégation de liaisons montantes, les groupes de porteuses d’agrégation de liaisons descendantes et les groupes de porteuses d’agrégation de liaisons montantes formant des paires de porteuses d’agrégation; déterminer les paramètres de voie d’accès aléatoire physique des paires de porteuses d’agrégation et mettre en œuvre l’accès. L’invention permet de réduire l’occupation des ressources de voie pendant l’accès aléatoire physique, et permet d’éliminer de fausses alertes et d’améliorer l’efficacité de détection, ce qui améliore le taux d’utilisation des ressources de porteuses et l’efficacité de l’accès aléatoire, permet de résoudre le problème d’attribution nécessaire de davantage de ressources aux porteuses de liaisons montantes, qui entraîne une perte d’efficacité de détection de fausses alertes et d’erreurs et une augmentation du surdébit engendré par la demande de ressources sur les porteuses composantes de liaisons montantes.
PCT/CN2009/075583 2009-08-19 2009-12-15 Procédé et dispositif d’accès aléatoire pour système d’évolution à long terme WO2011020269A1 (fr)

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CN200910167515XA CN101998646A (zh) 2009-08-19 2009-08-19 用于长期演进系统的随机接入方法及装置
CN200910167515.X 2009-08-19

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KR101995293B1 (ko) 2011-02-21 2019-07-02 삼성전자 주식회사 반송파 집적 기술을 사용하는 시분할 무선통신시스템에서 부차반송파의 활성화 또는 비활성화 방법 및 장치
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