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WO2006092080A1 - Méthode de distribution de code de brouillage de liaison amont dans un système wcdma - Google Patents

Méthode de distribution de code de brouillage de liaison amont dans un système wcdma Download PDF

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Publication number
WO2006092080A1
WO2006092080A1 PCT/CN2005/000260 CN2005000260W WO2006092080A1 WO 2006092080 A1 WO2006092080 A1 WO 2006092080A1 CN 2005000260 W CN2005000260 W CN 2005000260W WO 2006092080 A1 WO2006092080 A1 WO 2006092080A1
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WO
WIPO (PCT)
Prior art keywords
scrambling code
uplink
uplink scrambling
cell
allocated
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/CN2005/000260
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English (en)
Chinese (zh)
Inventor
Yazhu Ke
Jianwu Dou
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.)
ZTE Corp
Original Assignee
ZTE Corp
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 Corp filed Critical ZTE Corp
Priority to CN2005800493741A priority Critical patent/CN101156457B/zh
Priority to PCT/CN2005/000260 priority patent/WO2006092080A1/fr
Publication of WO2006092080A1 publication Critical patent/WO2006092080A1/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
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning

Definitions

  • the present invention relates to a Wideband Code Division Multiple Access (WCDMA) mobile communication system, and more particularly to a method for allocating an uplink scrambling code to a mobile user equipment when the mobile user equipment switches from another type of mobile communication system to a WCDMA mobile communication system.
  • WCDMA Wideband Code Division Multiple Access
  • the WCDMA communication system adopts the code division working mode.
  • the digital signal When the digital signal is framed on the physical channel, it needs to perform spreading and scrambling operations, and then transmit.
  • Spread-spectrum operation is the use of a high-speed digital sequence to multiply a digital signal to convert a data symbol into a series of chips, increasing the rate of the digital signal and increasing the signal bandwidth.
  • the symbols of the digital sequence used to convert the data symbols are referred to as orthogonal channelization codes, and the number of chips converted per data symbol is referred to as a spreading factor.
  • the scrambling operation uses a Gold code sequence to multiply the spread code to effect encryption of the signal. This Gold code sequence is called a scrambling code.
  • the downlink direction uses orthogonal channelization codes to distinguish physical channels, and the downlink scrambling codes are used to distinguish cells; in the uplink direction, channelization codes are used to distinguish channels, and uplink scrambling codes are used to distinguish users.
  • the scrambling code whose scrambling code number is in the range of 0 ⁇ 8191 is also to be used for the random access channel (PRACH), then for the user equipment switching from other types of mobile communication systems to the WCDMA mobile communication system.
  • WCDMA mobile communication system can be allocated
  • the scrambling code is actually very small, and different radio network controllers (RNCs) do not know which uplink scrambling codes have been assigned to PRACH or user settings within their own jurisdiction, which is easy to cause phase.
  • the user equipment in the neighboring area is assigned the same scrambling code, or the user equipment and the PRACH share an uplink scrambling code, causing serious mutual interference, resulting in handover failure or affecting access of users of the WCDMA mobile communication system. Therefore, it is necessary to improve the uplink scrambling code allocation of the existing WCDMA mobile communication system in the pre-allocation mode to avoid the above situation. Summary of the invention
  • the present invention has been made in view of the above problems in the prior art, and an object thereof is to provide a method for allocating an uplink scrambling code in a wideband code division multiple access mobile communication system, which avoids switching to different types of mobile communication systems from other types.
  • the user equipment of the WCDMA mobile communication system allocates the same uplink scrambling code.
  • the WCDMA mobile communication system uses a pre-allocation mode to allocate an uplink scrambling code to a user equipment that is switched from another type of mobile communication system to a WCDMA mobile communication system, the method includes the following steps:
  • the uplink scrambling codes assignable to the WCDMA mobile communication system are grouped according to the cell primary scrambling code number;
  • the user equipment switches from the other type of mobile communication system to the WCDMA mobile communication system; the radio network controller determines the scrambling code range of the uplink scrambling code that the cell can allocate according to the cell to which the handover user equipment is ready to handover;
  • the step of determining the type of the scrambling code to be allocated further comprises: determining whether the base station receiver supports multi-user detection; if multi-user detection is supported, the scrambling code type to be allocated is a short scrambling code; if multiple users are not supported For detection, the type of scrambling code to be assigned is a long scrambling code.
  • the step of allocating an uplink scrambling code further comprises: allocating an uplink scrambling code within an uplink scrambling code range assignable by the cell; if the cell has no assignable scrambling code, then in the same radio network controller The uplink scrambling code is allocated within the assignable scrambling code range of other cells under the jurisdiction.
  • the step of transmitting the allocated uplink scrambling code to the Node B of the cell further comprises: sending the uplink scrambling code to the Node B by using a radio link setup request message; The corresponding resource returns a radio link setup response message.
  • the step of transmitting the allocated uplink scrambling code to the user equipment further comprises: sending the uplink scrambling code to a core network by using a UTRAN response message; and the core network notifying other types of the user equipment Mobile communication system; said other type of mobile communication system notifying said user equipment by a command message switching to a wireless access network.
  • the step of determining a scrambling code number range of the uplink scrambling code that can be allocated by the cell further comprises: identifying an uplink scrambling code used by the cell for the random access channel as unavailable.
  • the method further includes: after the user equipment switches to the WCDMA mobile communication system, the radio network controller re-allocates the uplink scrambling code number to the user equipment in a range of 0-2 24 ; Scrambling code.
  • the present invention can prevent two adjacent radio network controllers from allocating the same uplink scrambling code by planning the uplink scrambling code for the user equipment for switching from other types of mobile communication systems to the WCDMA mobile communication system. Different user equipments for switching from other types of mobile communication systems to WCDMA mobile communication systems are avoided, and the uplink scrambling code used by the cell PRACH channel is avoided from being allocated to the user equipment, thereby improving the communication quality of the user and improving the call rate of the user.
  • the present invention adopts a cell grouping manner related to a cell downlink primary scrambling code, and the management of the scrambling code is very simple, and only needs to be managed in the cell, and since only a small scrambling code range is needed to find an available scrambling code. Therefore, the efficiency of assigning scrambling codes is also improved.
  • FIG. 1 is a schematic diagram of a user equipment switching from another type of mobile communication system to a WCDMA mobile communication system;
  • FIG. 2 is a flow chart of a method for allocating an uplink scrambling code according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a signaling flow of a radio network controller notifying an assigned uplink scrambling code to a Node B in the method shown in FIG. 2;
  • FIG. 4 is a schematic diagram of a signaling flow in which the radio network controller notifies the user equipment of the assigned uplink scrambling code in the method shown in FIG. 2.
  • FIG. 1 is a schematic diagram of a user equipment switching from another type of mobile communication system to a WCDMA mobile communication system.
  • cell 1 is controlled by radio network controller RNC 1
  • cell 2 is controlled by RNC 2; downlink primary scrambling codes of cell 1 and cell 2 have been planned to be allocated, and the primary scrambling code number of cell 1 is 32, cell The primary scrambling code number of 2 is 62, cell 1 and cell 2 are adjacent to the same frequency, and both cell 1 and cell 2 are adjacent to cells of other types of mobile communication systems.
  • User equipment UE 1 and UE 2 originally communicate in the cell of other types of mobile communication systems, now UE 1 moves to cell 1 and UE 2 moves to cell 2.
  • UE1 and UE2 will perform inter-system handover during the mobile process.
  • RC 1 and RNC 2 may allocate the same uplink scrambling code to UE1 and UE2.
  • the interference between UE1 and UE2 is very large, which causes UE1 and UE2 to fail to switch, and the increase in power between each other causes an increase in uplink interference of the system cell, which ultimately affects the stable operation of the system.
  • the scrambling code assigned to the UE is a scrambling code that the cell PRACH is using, which also affects the user's access.
  • FIG. 2 is a flow chart of a method of allocating an uplink scrambling code according to an embodiment of the present invention, which will be described below in conjunction with FIG.
  • the downlink primary scrambling code of each cell of the WCDMA mobile communication system has been performed at the time of system establishment. Planning, ensuring that the downlink primary scrambling codes of neighboring cells are different by planning, and the neighboring cells include the same
  • the RNC allocates uplink scrambling codes using a pre-assigned pattern.
  • R C groups the uplink scrambling codes assignable by the system by the cell primary scrambling code number.
  • the scrambling code number of the assignable uplink scrambling code ranges from 0-8191, that is, there are 8192 uplink scrambling codes that can be allocated.
  • the specific grouping method is as follows: For the WCDMA mobile communication system, there are 512 main scrambling codes of the cell, and the main scrambling code number is (K511.
  • the RNC divides 8192 scrambling codes into 512 groups, 16 in each group, so that each cell is available.
  • the number of uplink scrambling codes allocated to the switching user equipment is 16.
  • the uplink scrambling code includes two types of scrambling codes: long scrambling code and short scrambling code.
  • each cell has 16 uplink scrambling codes.
  • the primary scrambling code number of cell 1 in Figure 1 is 32, and the primary scrambling code number of cell 2 is 62.
  • step 205 the user equipment switches from the other type of mobile communication system to the WCDMA mobile communication system after the system handover decision.
  • the assignable uplink scrambling code can be a long scrambling code or a short scrambling code.
  • the scrambling code number range of the uplink scrambling code that can be allocated by the cell 1 is from (16 X 32+0) to (16 x 32+15), and the scrambling code number range of the uplink scrambling code that can be allocated by the cell 2 is from (16).
  • the PRACH of each cell uses a long scrambling code, in order to avoid the conflict between the allocated uplink scrambling code and the uplink scrambling code used by the PRACH, it is necessary to identify the scrambling code number of the uplink scrambling code used by the cell for PRACH as unavailable.
  • the type of the uplink scrambling code to be allocated is determined. Specifically, the RC determines the scrambling code type according to whether the base station receiver supports multi-user detection. If multi-user detection is supported, the short scrambling code is allocated; otherwise, the long scrambling code is allocated. Then, the handover user equipment is allocated an uplink scrambling code according to the scrambling code type, and the allocated uplink scrambling code is identified as unavailable. Specifically, the allocation is first performed in the scrambling code that can be allocated by the cell, and if there is no scrambling code that can be allocated, the allocation is performed in the assignable scrambling codes of other cells under the same RNC.
  • the uplink scrambling code is allocated in the scrambling code that is not allocated to the PRACH in the 16 uplink scrambling codes configured by the cell; in step 223, it is determined whether the uplink long scrambling code has been allocated, if When the PRACH occupies more scrambling codes and causes no scrambling resource allocation, the uplink idle long scrambling code resources of other cells under the same RNC are used for allocation (step 225).
  • the uplink scrambling code is allocated in the 16 uplink scrambling codes configured in the cell; in step 233, it is determined whether the uplink short scrambling code has been allocated, and if no scrambling code resources are assignable, the same is used.
  • the uplink idle short scrambling code resources of other cells under the jurisdiction of the RNC are allocated (step 235).
  • step 240 the assigned uplink scrambling code is transmitted to the corresponding user equipment and node B.
  • the specific flow is explained below in conjunction with Figs. 3 and 4.
  • the second uplink scrambling code allocation may be performed on the switched user equipment, that is, the user equipment is in the range of 0 to 2 24
  • the uplink scrambling code is re-allocated, and then the originally allocated uplink scrambling code is released, so that other switching user equipments can be used.
  • the adjacent RC can be avoided from being placed in the adjacent cell by grouping the uplink scrambling code into packets.
  • the UE allocates the same uplink scrambling code.
  • FIG. 3 is a schematic diagram of a signaling flow for transmitting an allocated uplink scrambling code to a Node B.
  • the RNC After the uplink scrambling code is assigned, the RNC notifies the Node B of the assigned uplink scrambling code through the Radio Link Setup Request message, so that the Node B and the user equipment perform physical channel synchronization. After receiving the node B, the corresponding resource is established, and then the radio link setup response (Radio Link Setup Response) message is returned to the R C.
  • Radio Link Setup Response Radio Link Setup Response
  • FIG. 4 is a schematic diagram of a signaling flow of transmitting an allocated uplink scrambling code to a user equipment.
  • the system initiates a request for "relay to WCDMA network” to the core network CN of the WCDMA system, and then the core network CN initiates a request for "relay to UTRAN” to the radio network controller RNC, and the radio network controller RNC is to switch to the system.
  • the user equipment allocates the uplink scrambling code, and returns the information to the core network CN through the "UTRAN response", and then the core network CN feeds back to other systems through the "WCDMA network response message", and then the other system uses "switch to UTRAN.
  • the command (Handover to UTRAN Command ) " message informs the user device.
  • the present invention is applicable to a Wideband Code Division Multiple Access (WCDMA) mobile communication system, and is suitable for a user equipment when switching from another type of mobile communication system to a WCDMA mobile communication system.
  • WCDMA Wideband Code Division Multiple Access

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

Abstract

L’invention concerne une méthode de distribution de code de brouillage de liaison amont dans un système WCDMA comprenant les étapes suivantes : grouper le code de brouillage de liaison amont qui a pu être distribué par le système WCDMA basé sur un numéro principal de code de brouillage de la cellule ; UE commute de l’autre type de système de communication vers le système WCDMA ; le contrôleur de réseau radio détermine la plage du numéro de code de brouillage du code de brouillage de liaison amont qui a pu être distribué par la cellule ; déterminer le type de code de brouillage à distribuer ; distribuer le code de brouillage de liaison amont ; transmettre le code de brouillage de liaison amont distribué à UE et au NodeB de la cellule. En utilisant le plan de code de brouillage de liaison amont de UE en commutant de l’autre type de système de communication vers le système WCDMA, la présente invention permet d’éviter que deux RNC voisins distribuent le même code de brouillage de liaison amont aux différents UE qui commutent de l’autre type de système de communication vers le système WCDMA, tout en évitant de distribuer à UE le code de brouillage de liaison amont utilisé par PRACH et le résultat est qu’il est possible d’améliorer la qualité de communication des utilisateurs.
PCT/CN2005/000260 2005-03-03 2005-03-03 Méthode de distribution de code de brouillage de liaison amont dans un système wcdma Ceased WO2006092080A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2005800493741A CN101156457B (zh) 2005-03-03 2005-03-03 宽带码分多址移动通信系统中上行扰码的分配方法
PCT/CN2005/000260 WO2006092080A1 (fr) 2005-03-03 2005-03-03 Méthode de distribution de code de brouillage de liaison amont dans un système wcdma

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2005/000260 WO2006092080A1 (fr) 2005-03-03 2005-03-03 Méthode de distribution de code de brouillage de liaison amont dans un système wcdma

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WO2006092080A1 true WO2006092080A1 (fr) 2006-09-08

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WO (1) WO2006092080A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101594679B (zh) * 2008-05-26 2011-12-28 中兴通讯股份有限公司 一种wcdma网络的自适应扰码分配方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1286548A (zh) * 1999-11-12 2001-03-07 深圳市中兴通讯股份有限公司 Wcdma小区搜索中扰码组号的判别方法和帧同步装置
CN1428957A (zh) * 2001-12-28 2003-07-09 深圳市中兴通讯股份有限公司上海第二研究所 一种宽带码分多址系统中基站分辨接入前缀的方法
CN1549478A (zh) * 2003-05-20 2004-11-24 ����������ͨѶ�ɷ����޹�˾�Ͼ��ֹ� Wcdma系统中的上行扰码分配方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100462058B1 (ko) * 2000-11-20 2004-12-17 에스케이 텔레콤주식회사 이동 통신 무선망에서 역방향 동기 시스템의 채널 코드할당 방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1286548A (zh) * 1999-11-12 2001-03-07 深圳市中兴通讯股份有限公司 Wcdma小区搜索中扰码组号的判别方法和帧同步装置
CN1428957A (zh) * 2001-12-28 2003-07-09 深圳市中兴通讯股份有限公司上海第二研究所 一种宽带码分多址系统中基站分辨接入前缀的方法
CN1549478A (zh) * 2003-05-20 2004-11-24 ����������ͨѶ�ɷ����޹�˾�Ͼ��ֹ� Wcdma系统中的上行扰码分配方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101594679B (zh) * 2008-05-26 2011-12-28 中兴通讯股份有限公司 一种wcdma网络的自适应扰码分配方法

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CN101156457B (zh) 2010-05-12
CN101156457A (zh) 2008-04-02

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