WO2009054763A1 - Procédé d'attribution de ressources radio - Google Patents

Procédé d'attribution de ressources radio Download PDF

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Publication number
WO2009054763A1
WO2009054763A1 PCT/SE2007/050779 SE2007050779W WO2009054763A1 WO 2009054763 A1 WO2009054763 A1 WO 2009054763A1 SE 2007050779 W SE2007050779 W SE 2007050779W WO 2009054763 A1 WO2009054763 A1 WO 2009054763A1
Authority
WO
WIPO (PCT)
Prior art keywords
cell border
mobile station
border area
allocation
determining
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE2007/050779
Other languages
English (en)
Inventor
Lei Xiao
Jiuhui Du
Bin Xu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to PCT/SE2007/050779 priority Critical patent/WO2009054763A1/fr
Priority to CN200780101226.9A priority patent/CN101836492B/zh
Publication of WO2009054763A1 publication Critical patent/WO2009054763A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties

Definitions

  • the present invention relates to a method and a device for allocating radio resources.
  • the present invention relates to a method and a device for allocating radio resources in a cellular radio system utilizing Time Division multiplexing.
  • the time slot is also a radio resource to consider when designing an efficient Radio Resource Management algorithm for the Radio Net work Controller RNC, which is the entity responsible for assigning radio resources to a mobile station in a cellular radio system such as TD-SCDMA.
  • RNC Radio Net work Controller
  • each carrier may have a multitude of timeslots assigned to it and each of those time lots may be associated with a multitude of codes.
  • radio resources i.e. carrier, timeslot and code
  • the assignment of all these radio resources, i.e. carrier, timeslot and code is typically made when a mobile station requires access to radio resources such as when establishing a new connection using a random access procedure or when entering the cell from an adjacent cell causing a handover to the new cell.
  • Such an initial allocation of radio resources may also be changed while a connection to a mobile station is active to achieve better performance.
  • a proper allocation of time slots to users can effectively decrease the interference to each other due to time division so that the whole system performance will benefit from the effective time slot allocation.
  • Many different Radio Resource Management algorithms have been proposed to allocate radio resources including, carrier, time slot, and code to users to improve the efficiency of the cellular radio system serving a particular area.
  • Another aspect of a cellular Time Division Synchronous Code Division Multiple Access system is the wide spread use of smart antenna technology.
  • the latest TD- SCDMA standard has defined an Angle of Arrival, AoA. measurement on the Random Access Channel RACH and the Uplink Dedicated Channel, DCH. The measurements on these channels are reported from the Radio Base Station the Radio Network Controller.
  • the RNC now has access to AoA information.
  • Radio Base Stations used for TD-SCDMA sectorized radio base stations are mostly used. For each sector served by one such radio base station, there is an antenna array and smart antenna technology is used to decrease the interference between users in one sector.
  • the Angle of Arrival information or another positioning method is used as input to determine if a particular mobile station will receive interference from other mobile stations within a handover area.
  • the Radio Network Controller i.e. the entity responsible for allocating resources within the cell is adapted to allocate time slots to different mobile stations which may interfere with each other in a handover area in the resource allocation to avoid such interference.
  • the radio network controller is adapted implement a radio resource management algorithm assigning a high priority for different time slots to mobile stations located close to a neighboring cell. i.e. in a handover area or cell border area.
  • the angle of arrival is used to determine the time slot to be used for a first user so that the time slot is different from a time slot allocated to another user in the same area as the first user.
  • This can for example be obtained by giving a high weight to the allocation of time slot to a user whose angle of arrival corresponds to the user being located in a handover area.
  • This can be particularly advantageous in case a base station is designed to service many cells in a sectorized pattern. Thus, users with AoA from a neighbor area but in different sector will have an increased possibly of having a different time slot than other users within the neighbor area, thereby reducing the interference.
  • an RNC can allocate radio resource more efficiently to avoid intra-NodeB interference with consideration of AoA information by defining a cell border area for each sector served by the same NodeB and allocate some specific time slots for each cell border area.
  • the method can be used for all resource allocation, such as random access, handover or dynamic channel allocation.
  • the method and device in accordance with the present invention enables use of AoA information or other location information to allocate radio resource accordingly.
  • AoA information or other location information to allocate radio resource accordingly.
  • - Fig. 1 is a view illustrating a cellular radio system.
  • - Fig. 2 is a view of a sectorized radio cell pattern, and
  • Fig. 3 is a flowchart illustrating some steps performed when allocating radio resources in a cellular radio system.
  • a view illustrating an exemplary cellular radio system 100 utilizing time division multiplexing is depicted.
  • the system 100 can for example be a Time Division Synchronous Code Division Multiple Access TD-SCDMA system.
  • the system 100 comprises a base station (Node B) 101.
  • the base station 101 serves a number of mobile stations, also termed User Equipment (UE) 103. located within the area covered by the base station 101 and or other base stations.
  • UE User Equipment
  • the base station 101 is also connected to a radio network controller node (RNC) 105.
  • RNC radio network controller node
  • the cellular radio system comprises functionality for measuring the Angel of Arrival of a mobile station moving within the area covered by the cellular radio system.
  • Angel of Arrival measurements are typically performed by the Node-B for example by a unit 109. i.e. it is one of Node-B functions.
  • the unit 109 may be a Global Positioning System GPS unit for determining positions of the mobile stations of the mobile stations served by the radio base station 101.
  • the RNC 105 can forward resulting measurements to the Radio Network Controller, RNC 105.
  • the RNC 105 is associated with a radio resource managing RRM unit 107. i.e.
  • the RRM unit 107 can typically be computer implemented and the particular RRM algorithm applied can be determined by a computer program product 1 1 1 loaded into the RRM module. Further. the RRM unit 107 in Fig. 1 can use Angle c f Arrival information or other information relating to the location of a user, such as GPS. when allocating resources as will be described hereinafter.
  • the Angle of Arrival AoA as measured by a particular base station 101 on the Random Access Channel, RACH is reported to the RNC 105 from the Base Station 101 during a random access procedure.
  • RNC 105 determines if the random access procedure initiated from a neighbor zone or sector which may also be termed a cell border area using the Angle of Arrival information. If the RNC 105 determines that the random access procedure is initiated from a cell border area, a predefined timeslot of the radio resource allocation algorithm applied is set to a higher priority.
  • an allocation scheme such as power evaluation, interference evaluation, code number evaluation and so on. the RRM algorithm of the RNC 105 can make the final carrier, time slot, and code allocation for this new user taking into account where the user is located in a particular area as determined by AoA information.
  • AoA of the uplink channel used such as the uplink Dedicated Channel, DCH. is reported from the base station 101 to RNC 105.
  • RNC 105 determines if the AoA corresponds to a user in a cell border area. If the RNC 105 determines that the connection is from a cell border area, a predefined timeslot of the radio resource allocation algorithm applied is set to a higher priority.
  • an allocation scheme such as power evaluation, interference evaluation, code number evaluation and so on.
  • the RRM algorithm of the RNC 105 can make the final carrier, time slot, and code allocation for this new user taking into account where the user is located as determined by AoA information.
  • the interference will be decreased.
  • a radio base station having three sectors is shown. Each sector has a cell border area / neighbor zone close to another sector.
  • the shape of the cell border area can be determined in any suitable manner including the currently used beam form and a shape related to the cell pattern. For example for a regular cell pattern and 8 element antenna array with 3-dB band width around 12.5 degree, it is possible to set a 12.5 degree deviation to sector boundary as neighbor zone. For example, for sector 1. it is possible to assign timeslot 4 to neighbor zonel 1 NZl 1 and time slot 5 to neighbor zone 12 NZ 12. For sector 2. it is possible to assign time slot 6 to neighbor zonel 1 NZl 1 , and timeslot 4 to neighbor zone22 NZ22. For sector 3.
  • time slot 5 it is possible to assign time slot 5 to neighbor zone31 NZ31 and time slot 6 to neighbor zone32 NZ32.
  • all adjacent cell border areas neighbor zones have been assigned different time slots.
  • time division between users in the same area will act to reduce the interference between those users.
  • Fig. 3 a flowchart illustrating some steps performed in a node, such as an RNC 105 of a time division cell.
  • the RNC 105 determines to allocate a radio resource for a particular user.
  • the step 301 can be triggered by many different events such as when a new users initiates a random access procedure or when a connection is handed over from one cell to another or when a user moves within a cell.
  • the RNC determines if the user which is to be allocated new radio resources is within a predefined area close to a cell border.
  • the positioning of a user can for example be made by using the AoA or in any other suitable manner such as a GPS position.
  • the RNC in a step 305 applies a radio resource management RRM algorithm increasing the likelihood of assigning a different time slot to the user than to other users that may be in the same cell border area such as described hereinabove.
  • the RRM algorithm may be set to assign a predetermined time slot to such a user.
  • the RRM algorithm may be adapted to make a radio resource allocation for the mobile station in the cell border area using positioning information in combination with power evaluation, interference evaluation, code number evaluation and so on.
  • the RRM algorithm of the RNC 105 can then make the final carrier, time slot, and code allocation for such a user taking into account where the user is located in a particular area as determined by AoA information or other positioning information.
  • step 303 If the user in step 303 is not determined to be within the cell border area, the RNC applies the normal RRM algorithm to the user, step 307.
  • a RRM algorithm can use AoA information or other location information to allocate radio resource accordingly.
  • AoA information or other location information can be used to allocate radio resource accordingly.
  • the method and system can be applied together with other resource allocation algorithm, such as power based evaluation, interference based on evaluation and so on.
  • the node such as an RNC. handling the RRM can improve the radio resource allocation so that the whole system performance is improved.

Landscapes

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

Abstract

Dans un procédé et un système servant à attribuer des ressources radio dans un système radio cellulaire à multiplexage par répartition dans le temps, des ressources radio sont attribuées à des stations mobiles en utilisant un algorithme de gestion des ressources radio donnant la priorité à une attribution d'intervalles de temps à une station mobile si on détermine que la station mobile se trouve dans une zone limitrophe d'une cellule prédéterminée.
PCT/SE2007/050779 2007-10-25 2007-10-25 Procédé d'attribution de ressources radio Ceased WO2009054763A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/SE2007/050779 WO2009054763A1 (fr) 2007-10-25 2007-10-25 Procédé d'attribution de ressources radio
CN200780101226.9A CN101836492B (zh) 2007-10-25 2007-10-25 分配无线电资源的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2007/050779 WO2009054763A1 (fr) 2007-10-25 2007-10-25 Procédé d'attribution de ressources radio

Publications (1)

Publication Number Publication Date
WO2009054763A1 true WO2009054763A1 (fr) 2009-04-30

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PCT/SE2007/050779 Ceased WO2009054763A1 (fr) 2007-10-25 2007-10-25 Procédé d'attribution de ressources radio

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CN (1) CN101836492B (fr)
WO (1) WO2009054763A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101925182A (zh) * 2009-06-15 2010-12-22 大唐移动通信设备有限公司 一种资源管理方法、系统和设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999055036A2 (fr) * 1998-04-17 1999-10-28 Net Insight Ab Procedes et appareils pour affecter des intervalles temporels a des canaux a commutation de circuits
WO2003009576A2 (fr) * 2001-05-31 2003-01-30 Nortel Networks Limited Procede et appareil de gestion de codes orthogonaux dans des systemes amcr faisant appel a l'acquis technologique de l'antenne intelligente
EP1771027A1 (fr) * 2005-09-30 2007-04-04 Robert Bosch GmbH Procédé et système pour un accès multiple à répartition temporelle (TDMA) modifié avec delai réduit

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EP1453337A1 (fr) * 2003-02-27 2004-09-01 Siemens Mobile Communications S.p.A. Méthode de gestion de ressources radio dans des réseaux de téléphonie cellulaire en fonction de la réduction des interférences, de l'allocation d'intervalles temporelles et d'un réseau d'antennes adaptatives
CN1787679B (zh) * 2004-12-09 2010-07-28 北京三星通信技术研究有限公司 无线网络控制器确定待定位用户设备的定位方法
CN101043693B (zh) * 2006-03-23 2011-05-11 华为技术有限公司 一种在小区间消除干扰的方法及系统
CN101242623B (zh) * 2007-02-08 2011-03-16 大唐移动通信设备有限公司 无线资源管理方法、无线网络控制器及基站

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999055036A2 (fr) * 1998-04-17 1999-10-28 Net Insight Ab Procedes et appareils pour affecter des intervalles temporels a des canaux a commutation de circuits
WO2003009576A2 (fr) * 2001-05-31 2003-01-30 Nortel Networks Limited Procede et appareil de gestion de codes orthogonaux dans des systemes amcr faisant appel a l'acquis technologique de l'antenne intelligente
EP1771027A1 (fr) * 2005-09-30 2007-04-04 Robert Bosch GmbH Procédé et système pour un accès multiple à répartition temporelle (TDMA) modifié avec delai réduit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th Los Angeles, CA, USA 26-29 Sept. 2004", vol. 7, 26 September 2004, ISBN: 9780780385214, article KASTELL K ET AL.: "Performance advantage and use of a location based handover alglorithm", pages: 5260 - 5264, XP010790409 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101925182A (zh) * 2009-06-15 2010-12-22 大唐移动通信设备有限公司 一种资源管理方法、系统和设备

Also Published As

Publication number Publication date
CN101836492B (zh) 2014-02-05
CN101836492A (zh) 2010-09-15

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