WCDMA RNP Cell Primary Scrambling Code Planning Guidance

Product name WCDMA RNP Product version V100R001Confidentiality level For internal use only Total 31pages WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only Prepared by Reviewed by Reviewed by Granted by URNP-SANA Date Date Date Date 2003-04-24 Huawei Technologies Co., Ltd. All rights reserved WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only Revision record Date 2003-04-24 2004-07-19 Revision version 1.00 2.00 Revision Description Initial transmittal Change the version, no content updated. Author Chen Qi Qinyan 10-4-30 All rights reserved. Page 2 of 31 WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only Table of Contents 1 Overview .................................................................................................................................................... 7 1.1 Objective ............................................................................................................................................... 7 1.2 Planning Principles................................................................................................................................ 8 1.3 Planning Method ................................................................................................................................... 9 2 Preparations for Applying Cell PSC Planner Tool................................................................................... 10 2.1 Checking PLMN Network Setup ........................................................................................................ 10 2.2 Checking BS Setup and Cell Distribution on Map.............................................................................. 12 2.3 Checking whether 3g Carrier is Set up and Added to Cell.................................................................. 13 2.4 Checking Cell Coverage Predictor ...................................................................................................... 14 3 Operation Process of Cell PSC Planner Tools ......................................................................................... 14 3.1 Setting Cell Range for Planning .......................................................................................................... 14 3.2 Automatic Planning of Intra-carrier Neighboring Cells ...................................................................... 15 3.3 Setting Schemas of Scrambling Code Group and Scrambling Code................................................... 17 3.4 Run the UMTS Scrambling Code Planner Tool .................................................................................. 17 3.4.1 Step 1 .................................................................................................................................... 18 3.4.2 Step 2 .................................................................................................................................... 18 3.4.3 Step 3 .................................................................................................................................... 20 3.4.4 Step 4 .................................................................................................................................... 21 4 Analysis on Cell PSC Planning ................................................................................................................ 24 4.1 Analysis on Scrambling Code Planning Report Generated Automatically ......................................... 24 4.1.1 Setting of Relevant Parameters......................................................................................... 24 4.1.2 Adjustment Method.............................................................................................................. 25 4.1.3 Example of Code Resource Reuse................................................................................... 26 4.2 Analysis on Manual Configuration of Cell PSCs ................................................................................ 28 4.2.1 Determining the Code Resource to be Used................................................................... 28 4.2.2 Planning Method .................................................................................................................. 29 4.3 Minimum Reuse Distance and Scrambling Code Resource Reservation ............................................ 30 10-4-30 All rights reserved. Page 3 of 31 ............................................................................................... Page 4 of 31 ......... 7 The Parameters in scrambling code planner...................... 24 10-4-30 All rights reserved.......WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only List of Tables Table 1 Table 2 Primary Scrambling Code........................................................... ...............................................................................................................................................................................................................Code) ............................................. 16 Code Schemas .............................................................................................................WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 PLMN ...................... 18 Scrambling code planner: step1 .................................................................................................................................................................................................................................. 14 Coverage Predictor .............................................................................................. 20 Scrambling code planner: step4 ..... 17 Scrambling code planner ........................................................................... 29 Minimize Reuse Distance ............................................................................................................................................................................................... 15 Neighbour Planner............................................................................................ 11 NodeBs&Cells ..................................................................................................... 28 Manual PSC Planning ..... Page 5 of 31 ....................................................... 19 Scrambling Code planner: step3 ............................................................................................................................... 18 Scrambling code planner: step2 .............. 13 Carriers ............................................................................................. 22 For example: NanJing Coverage .................................. 27 For example: NanJing PSC Planning (CodeGroup................................. 14 Filters ................................................ 30 10-4-30 All rights reserved....................................................................................................................................................................................... 10-4-30 All rights reserved. List of abbreviations: Omitted. cell primary scrambling code Abstracts: This document presents the allocation principles for cell primary scrambling code in the WCDMA network.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only WCDMA RNP Cell Primary Scrambling Code Planning Guideline Key word: Spread code. Page 6 of 31 . scrambling code. and introduces the method for the tool of automatic allocation scrambling codes. In downlink. The 512 PSCs are also divided into 64 groups. Table 1 Primary Scrambling Code Primary scrambling code/scrambling group PSC_1 0 PSC_2 16 PSC_3 32 PSC_4 48 PSC_5 64 PSC_6 80 PSC_7 96 224 352 480 608 736 864 992 1120 1248 1376 1504 1632 1760 1888 2016 208 336 464 592 720 848 976 1104 1232 1360 1488 1616 1744 1872 2000 192 320 448 576 704 832 960 1088 1216 1344 1472 1600 1728 1856 1984 176 304 432 560 688 816 944 1072 1200 1328 1456 1584 1712 1840 1968 160 288 416 544 672 800 928 1056 1184 1312 1440 1568 1696 1824 1952 144 272 400 528 656 784 912 1040 1168 1296 1424 1552 1680 1808 1936 128 256 384 512 640 768 896 1024 1152 1280 1408 1536 1664 1792 1920 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 10-4-30 All rights reserved. and will repeat in every frame. Page 7 of 31 . different SPU sub-systems of different BM frames in a single RNC on the RAN side segment the uplink scrambling codes. These 8192 codes are divided into 512 groups. in order to speed up the cell searching procedure. Then the segment number will be used to generate uplink scrambling codes within the corresponding range randomly. SSC must be used for scrambling. The purpose of this document is to present how to plan the cell primary scrambling codes (PSC). and the other 15 ones are secondary scrambling codes (SSC). so that the users can be identified in uplink easily without planning. When accessing the system from the subscriber queries according to the SpuCpuId the uplink scrambling code segment numbers that this SPU can assign. However. referring to long scrambling codes only. as shown in the following table. The first scrambling code of each group is called primary scrambling code (PSC). Network planning is required for the downlink to identify the cells.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only 1 Overview 1. Besides SCH. PCCPCH/PCPICH/PICH/AICH/SCCPCH in the downlink uses the downlink PSC or SSC for scrambling. The downlink scrambling codes. by means of automatic planning with the network planner tool or manually planning. the user is identified with the channel codes. If the number of users in this cell exceeds a certain value. Each scrambling code corresponds to one channel code tree. each of which contains 16 scrambling codes. In the realization. The uplink scrambling codes range from 0 to 2 24 -1. Every user can use the cell PSC for scrambling. so as to ensure any two intra-frequency cells interfering to each other do not have identical PSCs. so that the UE can find the proper scrambling code. only 8192 codes can be used. each of which contains 8 PSCs.1 Objective This document is to be a guide of RNP engineers for the radio network planning work. So there are 512 PSCs in all. The RNC selects and assigns them randomly. For the scrambling code analysis. range from 0 to 2 18 -1. refer to Reference [1]. Based on this. Besides. These cells interfering to the primary cell are adjacent cells of the primary cell. The cell border is determined according to UE Rx level. In the cell PSC planning. we must conform to this principle: The intra-frequency cell interfering to the primary cell cannot use the same cell PSCs as the primary cell. with some reserved for future use. which are limited. it is necessary to consider the allocation of the downlink PSCs in the cell planning procedure. So we need to plan the downlink PSCs properly. neighboring cells exist in the adjacent cells of the primary cell.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only PSC_8 112 240 368 496 624 752 880 1008 1136 1264 1392 1520 1648 1776 1904 2032 16 2048 2064 2080 2096 2112 2128 2144 2160 17 2176 2192 2208 2224 2240 2256 2272 2288 18 2304 2320 2336 2352 2368 2384 2400 2416 19 2432 2448 2464 2480 2496 2512 2528 2544 20 2560 2576 2592 2608 2624 2640 2656 2672 21 2688 2704 2720 2736 2752 2768 2784 2800 22 2816 2832 2848 2864 2880 2896 2912 2928 23 2944 2960 2976 2992 3008 3024 3040 3056 24 3072 3088 3104 3120 3136 3152 3168 3184 25 3200 3216 3232 3248 3264 3280 3296 3312 26 3328 3344 3360 3376 3392 3408 3424 3440 27 3456 3472 3488 3504 3520 3536 3552 3568 28 3584 3600 3616 3632 3648 3664 3680 3696 29 3712 3728 3744 3760 3776 3792 3808 3824 30 3840 3856 3872 3888 3904 3920 3936 3952 31 3968 3984 4000 4016 4032 4048 4064 4080 32 4096 4112 4128 4144 4160 4176 4192 4208 33 4224 4240 4256 4272 4288 4304 4320 4336 34 4352 4368 4384 4400 4416 4432 4448 4464 35 4480 4496 4512 4528 4544 4560 4576 4592 36 4608 4624 4640 4656 4672 4688 4704 4720 37 4736 4752 4768 4784 4800 4816 4832 4848 38 4864 4880 4896 4912 4928 4944 4960 4976 39 4992 5008 5024 5040 5056 5072 5088 5104 40 5120 5136 5152 5168 5184 5200 5216 5232 41 5248 5264 5280 5296 5312 5328 5344 5360 42 5376 5392 5408 5424 5440 5456 5472 5488 43 5504 5520 5536 5552 5568 5584 5600 5616 44 5632 5648 5664 5680 5696 5712 5728 5744 45 5760 5776 5792 5808 5824 5840 5856 5872 46 5888 5904 5920 5936 5952 5968 5984 6000 47 6016 6032 6048 6064 6080 6096 6112 6128 48 6144 6160 6176 6192 6208 6224 6240 6256 49 6272 6288 6304 6320 6336 6352 6368 6384 50 6400 6416 6432 6448 6464 6480 6496 6512 51 6528 6544 6560 6576 6592 6608 6624 6640 52 6656 6672 6688 6704 6720 6736 6752 6768 53 6784 6800 6816 6832 6848 6864 6880 6896 54 6912 6928 6944 6960 6976 6992 7008 7024 55 7040 7056 7072 7088 7104 7120 7136 7152 56 7168 7184 7200 7216 7232 7248 7264 7280 57 7296 7312 7328 7344 7360 7376 7392 7408 58 7424 7440 7456 7472 7488 7504 7520 7536 59 7552 7568 7584 7600 7616 7632 7648 7664 60 7680 7696 7712 7728 7744 7760 7776 7792 61 7808 7824 7840 7856 7872 7888 7904 7920 62 7936 7952 7968 7984 8000 8016 8032 8048 63 8064 8080 8096 8112 8128 8144 8160 8176 1. Any cell may be a primary cell with adjacent cells. all downlink PSCs will not be used in the initial stage of network planning. Therefore. and increase the utilization of the code resource by means of code reuse.2 Planning Principles The allocation of downlink PSCs dose not affect the simulation of network planning. In terms of primary cell. Page 8 of 31 . as well as the factors of capacity expansion and coverage of the network in the future. it can receive pilot 10-4-30 All rights reserved. But there are only 512 downlink PSCs for identifying intra-frequency cells. we can see that when the code resource is restricted. no matter the PSCs of the primary cell and those of the neighboring cell are allocated to the same scrambling code group or not. So this method is recommended. it is impossible to 100% ensure the PSCs of all cells allocated in the same scrambling code group. with the PSCs of the primary cell and those of the neighboring cells belonging to different scrambling code groups. the cell PSC planning in WCDMA is not a key performance index (Refer to Section 4. If the pilot signal at the border of the primary cell is stronger than that of other cells.5. So these cells cannot adopt the same PSCs as the primary cell. their strength is weaker than the access level of the UE though. For the pilot signals from other non-neighboring cells in the adjacent cells received on the border of the primary cell. From the automatic planner tool. which can use the same PSCs as this primary cell. with the PSCs of the primary cell and those of the neighboring cells belonging to the same scrambling code 10-4-30 All rights reserved. the former one requires less scrambling code groups. On the other hand. the third step. It may probably simplify the cell searching procedure of the UE (related to the scrambling code dependency matching strategy of the UE). which is convenient for reservation and manually planning. they generates interference to the receiver of the UE. Actually. This is related to the realization of the UE. This allocation procedure is quite similar to the frequency planning in GSM. Page 9 of 31 . That is. a complicated procedure. this cell is (or probably is) the neighboring cell of the primary cell. and it can also be applied for the automatic scrambling code planner tool. So the cell PSCs can be planned in one of the following two methods:  group.2. Primary cell uses different PSCs from the neighboring cells. the cell searching procedure of the UE will not be speeded up.3 Planning Method The allocation of cell PSCs. which size is determined by handover margin. Comparing these two methods. can be performed with the planning tool. the cells without interference to the primary cell are regarded as non neighboring cells. But the difference is.4 of Reference [5]). And there is a soft handover area between two neighboring cells. These pilot signals may be stronger or weaker than that of UE access level. and the PSCs in the scrambling code group can be allocated continuously. The UE should be able to find any PSC that is allocated by the network side among the 512 PSCs. 1. The allocation of cell PSCs cannot guarantee a fast scrambling code identification process of the UE. which is specified by the supplier. We do not strictly require that all the cells use the eight scrambling codes of one scrambling group only.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only signals from other intra-frequency cells at the border of the cell.  Primary cell uses different PSCs from the neighboring cells. Please note that we only provide the planning ideas here. refer to Reference [2]. will determine whether to add the number of scrambling code groups or adding the number of scrambling codes in the scrambling code group. for performing the cell PSC planning automatically. and whether BSs and cells have been set up in this network. Page 10 of 31 . you can learn the operation methods for Enterprise 4. the judging criteria and adjusting methods. please check the following items: 2. Refer to Reference [3] for the setting of all the parameters.0. as well as the analysis on the planning result. Moreover. the network planner tool provided by AIRCOM. depending on whether the cell PSCs are allocated continuously.1 Checking PLMN Network Setup Select the 3g->Database->Site menu as shown in the following window. 10-4-30 All rights reserved. The parameter description of each schematic diagram is only for the parameters involved in the scrambling code planning only. the operation methods for manual planning of cell PSCs are provided.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only “Setting of the Minimize item in Filter”. In the following chapters. and then check whether a PLMN network exists. 2 Preparations for Applying Cell PSC Planner Tool Before using the scrambling code planner tool for scrambling code planning. For the method for importing NodeB.  PLMN In the UMTS Parameters frame in the “Tab (Cell Params)” window: Scrambling Code [0…7]: This specifies the PSCs used by the cell. It is a target value for reference in the automatic planning.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only Figure 1 Description of the relevant parameters:   to 7. ranging from 0 Scrambling Code Group [0…63]: This specifies the scrambling code group of the PSCs used by this cell.   Scrambling Code Planning Parameters frame: # of Code Groups in Neighbour Cells: It specifies the total number of the scrambling code groups that this cell and its neighboring cells can use. it can be designated directly in this frame. ranging from 0 to 63. Page 11 of 31 . If it is set to 0. Note: If the PSCs of a cell do not need automatic planning. the item of #Code Group in the 10-4-30 All rights reserved. Note: If the PSCs of a cell and those of its neighboring cells are allocated to the same scrambling code group. the item of #Code in the cell PSC planning report automatically generated will be shown as N/A. Page 12 of 31 . It is a target value for reference in the automatic planning. that means no constraint condition. 10-4-30 All rights reserved. and select a map from the pull-down box (note: If the terrain is not displayed. indicating Not Available. indicating Not Available. 2. select the button <Show Data Types> and then <Clutter Data> to configure the display elements). indicating this constraint condition will be taken into account in the automatic planning. If it is set to 0.  It specifies the total number of scrambling codes available in a scrambling code group of this cell and the neighboring cell.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only cell PSC planning report automatically generated will be shown as N/A.2 Checking BS Setup and Cell Distribution on Map Select the 3g->View->New 2D view menu. refer to Reference [4]. the parameter # of Code Groups in Neighbour Cells can be set to 1. In following window check whether BSs and cells exist in the map. At the same time. (Note: the map is imported by setting the relevant contents of the coordinate system and the maximum and minimum of the latitudes and longitudes of the map in the “Modify Project” window. For detailed operation. the antenna data should also be imported. that means no constraint condition. and then check whether the carriers have been added to the cell. as shown in figure 3.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only Figure 2 NodeBs&Cells 2. 10-4-30 All rights reserved.3 Checking whether 3g Carrier is Set up and Added to Cell Select the 3g->Options->Carriers menu as shown in the following window. and check whether 3g carriers have been configured or not. Page 13 of 31 . Page 14 of 31 .4 Checking Cell Coverage Predictor Select the 3g->Tools->Coverage Predictor menu to checking whether the cell coverage has been created or not. 10-4-30 All rights reserved. and then set the cells to be allocated in this Filter.1 Setting Cell Range for Planning Select the 3g->Database->Filters menu as shown in the following window. Figure 4 Coverage Predictor 3 Operation Process of Cell PSC Planner Tools 3. and add Filter.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only Figure 3 Carriers 2. set the relevant parameters as required to complete the automatic planning of intra-frequency cells. If intra-carrier neighboring cells need to be considered in Step 2 of automatic scrambling code planning in Section 3.2 Automatic Planning of Intra-carrier Neighboring Cells Select the 3g->Tools->Neighbour Planner menu as shown in the following figure.4. this step is mandatory for getting the neighboring cells for each cell.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only Figure 5 Filters 3. Page 15 of 31 . After selecting the cells to be planned and the Filters whether the neighboring cells of these cells are located. 10-4-30 All rights reserved.    Carrier: It refers to the carrier used by the neighboring cell.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only Figure 6 Description of relevant parameters:   Neighbour Planner Intra-Carrier Planning frame: Intra-carrier neighboring cell planning Override Handover Margin [dB]: It indicates the pilot power difference between two cells within the handover area should be smaller than or equal to the handover margin value input here. This parameter can be used to filter them. The primary cell may have several soft handover areas meeting the requirement of Handover Margin. the larger the soft handover area. The bigger this parameter value. When it is set to 0. indicating the interfering area between the primary cell and the neighboring cells should be greater than this value. but some soft handover area in the simulation is too small. this parameter should be set with consideration the soft handover overhead in the planning. Resolution[m]: It is the resolution of the digital map as recommended. Thus more checks will be carried out for a successful soft handover in the simulation procedure. and it controls Eb/No distribution achieved by UE.  Standard Deviation [dB]: It specifies the Eb/No standard deviation of the service that the UE can accept. This parameter is induced in the discussion on candidate cell for soft handover. and the average power value between various cells in the activity set will be increased too. Minimum Interfering Area [km 2 ]: It specifies the minimum interfering area between the primary cell and a neighboring cell. it indicates to ignore any deviation caused by power control. If the deviation caused 10-4-30 All rights reserved. Hence. indicating the soft handover connections will be increased. Page 16 of 31 . 3. 10-4-30 All rights reserved. as shown in the following figure and then set the scrambling code group and scrambling code resource. Page 17 of 31 .3 Setting Schemas of Scrambling Code Group and Scrambling Code Select the 3g->Tools->Code Schemas menu. Figure 7 Code Schemas 3. the Eb/No standard deviation of this service must be set (other than 0).4 Run the UMTS Scrambling Code Planner Tool Select the 3g->Tools->Scrambling Code planner menu.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only by power control must be considered.  Number of Neighbouring Cells: It refers to the maximum number of neighboring cells that can be assigned to each cell. as shown in the following figure and the click <Next>. WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only Figure 8 Scrambling code planner 3.2 Step 2 10-4-30 All rights reserved.1 Step 1 In the following figure select cells to be planned and the Filters where the neighboring cells of these cells are located.4. and the click <Next>.4. Figure 9 Scrambling code planner: step1 3. Page 18 of 31 . it indicates to consider the distribution of the adjacent cell in the automatic planning.   Code reuse distance frame: Consider code reuse distance: When it is selected.  Select carriers for planning frame: Selecting the carriers of the intra-carrier cell to be planned.   Adjacent cells frame: Consider Adjacent cells: When it is selected.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only In the following figure set the factors to be considered in the automatic planning.  Max. it indicates to consider code resource reuse in the automatic planning. within which there is no identical cell PSCs. code reuse distance (km): It indicates the cell range from the primary cell. it indicates to consider the distribution of the neighboring cell in the automatic planning. Page 19 of 31 .  Min. 10-4-30 All rights reserved. # of adjacent cells: It refers to the maximum number of the adjacent cells with different cell PSCs. and the click <Next>: Figure 10 Scrambling code planner: step2 Description of relevant parameters:   Neighbouring cells frame: Consider Neighbouring cells: When it is selected.  Resolution (m): It is the resolution of the digital map as recommended. so they will be ignored. Page 20 of 31 . Read-Only (indicating the automatic planner tool will not change the cell PSCs in this Filter. it indicates no cell under a NodeB use identical cell PSCs. even if collision occurs. and can be adjusted by means of the upward and downward buttons on the left in the window above. The priority of a Filter is determined according to its arrangement sequence.4. 10-4-30 All rights reserved. 3. and these cells will not be present in the planning report either. If a cell belongs to two Filters at the same time. And the Filter defined to this level will be present in the report). State: Set the state of the current cell set to one of these three states: Planed (indicating the automatic planner tool assigns these cell PSCs to the cells of these Filters). and Ignore (indicating the automatic planner tool will not consider the cells in the Filter of this level.3 Step 3 In the following figure select the code resource applied for the planning. and then other constraint conditions. you need to select its state from the Filter of the higher priority.).WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only  Do not assign same code to cells under the same NodeB: When it is selected. You can click the State column to select one in the drop-down list box. no matter these cells are in the same frequency or not. Figure 11 Scrambling Code planner: step3 Description of relevant parameters:    Description of the fields in the table above: Filter: It lists the Filters requiring automatic scrambling code allocation. and click <Finish>. 3. the scrambling code planner tool will adopt the number of scrambling code groups that can be used by the neighboring cells of this cell designated in the cell parameter table in Section 2.  Code Schema: It indicates to select the code resource to be allocated in the scrambling code planning.4 Step 4 The cell PSC planning report is generated as shown in the following figure. It is valid for all the cells in the Filter. Note that if a cell belongs to two Filters. But it should be optimized. the scrambling code planner tool will use the number of scrambling codes that can be used by the neighboring cells of this cell designated in the cell parameter table in Section 2. It is taken as reference from the automatic planning of the neighboring cell list. click <Apply All Carriers> or <Apply Carrier> to complete the cell PSC planning. that is to minimize the number of scrambling codes or the number of scrambling code groups.  #Codes: This specifies the maximum number of scrambling codes used for a cell and its neighboring cells. It is taken as reference for the automatic planning which is performed based on the neighboring cell list.  Cell Property button: To specify the number of special scrambling code groups and scrambling codes for a cell.1.4. the automatic planner tool will increase the number of scrambling codes in each group instead. This has been mentioned in the parameter of State of Filter. But it should be optimized. If this value is null. which is created in Section 3. 3. the automatic planner tool will increase the number of scrambling code groups instead of the number of scrambling codes in each group.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only  #CodeGroups: This specifies the maximum number of scrambling code groups used for a cell and its neighboring cells. Analyze the report. the code planner tool will consider this item. If this parameter is set to #Code. you can click this button to append parameters conveniently. if it is set to #CodeGroup. If this value is null. if the scrambling code groups and scrambling codes to be used for a cell and its neighboring cell exceed the code resource requirement on a Filter. It is valid for all the cells in the Filter.1.  Minimize: In the automatic planning procedure. Page 21 of 31 . its state should be selected from the Filter of the higher priority. If the scrambling code group and scrambling code assigned to the cell meet the requirements. 10-4-30 All rights reserved. Here you can select different carriers in the same window to browse the allocation result of the cell PSCs at this frequency.  Apply All Carriers and Apply Carrier buttons: If you are satisfied with the allocation result of PSCs in the pre-planning. you can click one of these two buttons to apply the pre-planning result to the parameter setting of each cell.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only Figure 12 Scrambling code planner: step4 Description of relevant parameters:  Carrier Name: The automatic planner tool can assign cell PSCs to the intra-carrier cell at different frequencies simultaneously. 10-4-30 All rights reserved. Page 22 of 31 .   Descriptions of the fields in the cell PSC table: Cell name: List of intra-carrier cells at the selected frequency. Relevant description of the scrambling code groups and scrambling codes of the neighboring cells of the selected cell. if the scrambling code groups and scrambling codes to be used for a cell and its neighboring cell exceed the code resource requirement on a Filter. and will be planned first.  CodeGroup: It refers to the scrambling code group assigned by the scrambling code planner tool. Page 23 of 31 . the cell belonging to two Filters has higher priority.1.  Code: It refers to the scrambling code assigned by the scrambling code planner tool.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only State: It indicates the PSCs of this cell is Planed (indicating the automatic planner tool assigns these cell PSCs to the cells of these Filters) or Read-Only (indicating the automatic planner tool will not change the cell PSCs in this Filter). if it is set to #CodeGroup.1. the automatic planner tool will increase the number of scrambling code groups instead of the number of scrambling codes in each group. that is to minimize the number of scrambling codes or the number of scrambling code groups.  Minimize: In the automatic planning procedure.  #C(Target): It is the number of scrambling codes designated for the neighboring cells only in the case the neighboring cells are considered in the automatic planning.  #CG (Target): It is the number of scrambling code groups used designated the neighboring cells only in the case the neighboring cells are considered in the automatic planning. the designated adjacent cells.  #CG (Achieved): It is the number of scrambling code groups actually used for the neighboring cells after the planning only in the case that the neighboring cells are considered in the automatic planning. all the cells nearby and other cells under the NodeB: 10-4-30 All rights reserved. If this parameter is set to #Code. In the planning. the code planner tool will consider this item. that is the value set in the cell properties in Section 2. that is the value set in the cell properties in Section 2. the automatic planner tool will increase the number of scrambling codes in each group instead.  %Quality: It displays the interference percentage of the cells with identical scrambling codes only in the case the adjacent cells are considered in the automatic planning.  #C(Achieved): It is the number of scrambling codes actually used for the neighboring cells after the planning only in the case the neighboring cells are considered in the automatic planning. No setting unless the total number of the PSCs used for the neighboring cells of a cell is restricted Override Handover Margin [dB] Neighbouring Cells Planning Resolution[m] Minimum Interfering Area[km 2 ] X X 3–6 It specifies the size of the handover area.  Nearby Cells: This specifies the scrambling code groups and scrambling codes of all the cells nearby.1 Setting of Relevant Parameters It can be learnt from the parameters inputted in the operation process that the allocation of cell PSCs by the automatic planner tool is related to such factors as the scrambling code groups and scrambling codes that can be used.1 Analysis on Scrambling Code Planning Report Generated Automatically 4. The following table shows the setting of the relevant parameters in the cell PSC planning. the number of neighboring cells.1. 4 Analysis on Cell PSC Planning 4. the scrambling code reuse distance.  Adjacent Cells: This specifies the scrambling code groups and scrambling codes of the designated adjacent cells of the selected cell. Table 2 The Parameters in scrambling code planner Parameter name Cell Properties # of Code Groups in Neighbour Cells # of Codes in Neighbour Cells 0 Value 0 Setting description No setting unless the number of the scrambling code groups of the PSCs used for the neighboring cells of a cell is restricted. If the pilot of two cells is 3dB different from each other. and whether it is allowed to assign same code to cells under the same NodeB. It is the minimum value of the geographical range of the actual handover area between 10-4-30 All rights reserved. it can be set according to the proportion of actual handover. It is set to the resolution of the digital map. Page 24 of 31 .WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only  Neighbours Cells: This specifies the scrambling code groups and scrambling codes of the neighboring cells of the selected cell. resolution.  NodeB Cells: This specifies the scrambling code groups and scrambling codes of other cells under the NodeB. 2 Adjustment Method We can easily learn from the scrambling code report generated in Figure 12 that there are many cells with clash codes with red mark. # of adjacent cells 6 6–18 It indicates that each hexagon primary cell has 6 neighboring cells. Page 25 of 31 . Only the Filter where the cell not to be planned but for reference only will be set to ReadOnly ro Ignored This specifies that the PSCs of each cell and its neighboring cells in this Filter are divided into one scrambling code group.1. Such a code allocation result does not meet the requirement. Here is the adjustment method: 10-4-30 All rights reserved. 4. code reuse distance (km) Resolution (m) State Filter #CodeGroups 1 X X Planed Max. Standard Deviation [dB] 0 It refers to the Eb/No distribution of UE. It is the resolution of the digital map. It is deducted with the formula 4. it indicates the Eb/No of the UE reaches the target value.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only every two neighboring cells. considering it is continuous allocation or not. When it is set to 0. indicating all the adjacent cells are neighboring cells. Number of Neighbouring Cells Scrambling Code Planning Min. increase the number of available scrambling codes in each scrambling code group or add the number of scrambling code groups. It can be set to 6 for hexagon cell. indicating the power control deviation can be ignored. It specifies the maximum number of adjacent cells of each primary cell. #Codes 7 This specifies that the maximum number of available PSCs of each cell and its neighboring cells in this Filter is 7.1. It can be adjusted according to the scrambling code resource. Minimize #CodeGroups or #Code If the above two items cannot be satisfied. It can be adjusted according to the scrambling code resource. It is to be set according to the actual situation. if the minimum reuse distance is ignored. The above formula can be represented in the form of the formula (4. 10-4-30 All rights reserved. Page 26 of 31 . 1 and 2. It is adjusted within the range of (6–8). For the 3 1 neighboring base stations distributed equably. Here the number of adjacent cells is Max[The number of adjacent cells interfering to each other of each cell]. ( 4. then the cell using the same PSCs as the primary cell is located at the point crossing two cells toward south or other directions then crossing one cell after tuning 60 o counterclockwise.2 of Reference [5] for the formula deduction and analysis). The numerals of X. 7. K  i  j   ij 2 i， j  0， 1， 2， 3. The following example is the maximum reuse allowed with the consideration of the case that the primary cell has 8 adjacent cells interfering to each other: Description of planning parameters: 1) there are totally 246 cells.13. if 7 scrambling codes are used. For example. so we can roughly estimate the minimum radius as: Average cell radius 70%. The minimum reuse distance can be calculated according to the following the formula (4. But only 23 are used.. that is. If clash code still occurs. 9. and K is the number of cell PSCs used.2).. and parameters i and j are 2 and 1 respectively.2 ) The parameters i and j are the number of cells crossed in different directions within the scrambling code distance.1 ) D is the minimum reuse distance. 12…}. # of adjacent cells is 8 and the Min. Note: in the cell planning.58R. 3) the Max. We can see from the generated scrambling code planning result that the scrambling code reuse is for occupying the minimum code resource. 3.1. D  R 3K ( 4. adjacent cells interfering to each other must be considered in practice. R stands for the minimum cell redius. that is to ensure only neighboring cells use different PSCs.3 Example of Code Resource Reuse The following is the planning of cell PSCs for the cells covered in Naijing City. The range value of K is {1. 4. code reuse distance (km) is 2 (The radius of the smallest cell). This distribution law is shown in Figure 14 in the example of Section 4. you can also increase the available code resource. which is enough.1) (Refer to Section 4. 2) the code schema designates three scrambling code groups of 0. to increase the value of K to achieve the optimal effect. we know the average cell radius. However.X represent scrambling code group and scrambling code respectively. 7 PSCs are enough. Here the minimum reuse distance of scrambling codes is 4.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only First adjust the number of adjacent cells interfering to each other and the minimum reuse distance to the optimal value. containing 24 scrambling codes in all. 4. WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only Figure 13 For example: NanJing Coverage 10-4-30 All rights reserved. Page 27 of 31 . 3 40 1.0 38 46 44 61 0.5 0.0 80 10 49 0.3 2.1 1.6 1.0 24 73 12 65 1.2 1.0 17 70 0.2 2.1 0.2 0.1 1.2 2. each of which contains 8 PSCs.2 33 0.2 43 41 1.0 1.3 0.0 1.2 1.0 2.2 1. the maximum number of available scrambling code resource is 64 scrambling code groups.2 1.2 2.5 1.1 Determining the Code Resource to be Used When the number of cells to be planned is greater than or equal to 512.1 22 77 0.4 1.2 2.2 1.5 2.3 55 8 9 0.0 0.2 36 1.2 2.4 0.0 0.0 1.1 2.1 1.1 1.0 0.1 58 78 1.0 0.0 1.2 0.3 2.0 1.2 1.2 2.4 1.3 2.2 57 1.3 2.3 1.3 2.3 1.0 0.1 2.6 1.3 0.0 50 0.1 20 0.0 1.0 3 2.5 0.1 0.1 68 2 0.4 23 16 30 1.3 0.1 1.3 0.0 0.5 25 0.3 2.1 1.1 1.6 0.0 1.1 1.0 31 0.2 1.0 72 64 2.1 2.1 0.5 0.0 2.2 76 13 11 1.3 2.1 1.5 2.2 0.0 2.5 0.0 2.1 0.5 2.1 2.1 0.2 1.4 0.1 1.279 0.4 2.2 45 2.2 21 47 1.3 0.2 0.3 52 69 71 0.4 63 1.0 2.2 0. 10-4-30 All rights reserved.1 0.0 2.2 0.1 0.7 1.1 37 59 0.0 1.2 0.2 51 0.0 56 0.4 1.0 2.2 Figure 14 For example: NanJing PSC Planning (CodeGroup.4 34 1.3 0.0 1.0 0.0 0.6 0.4 0.1 2.0 2.0 0.4 1.0 2.0 0.5 2.1 1.3 2.2 1.0 0.1 1.0 2.1 0.6 1.0 1.6 0.5 2.0 1.7 1.Code) 4.0 1.1 67 53 1 2.1 0.0 1.0 39 60 0.1 1.7 1.3 1.3 0.2.2 1.1 0.2 0.1 1.0 1.4 1.0 2.6 2. Page 28 of 31 .3 2.1 1.0 28 2.0 42 0.2 2.4 2.1 0.2 2.2 1.3 1.1 2.3 1.2 Analysis on Manual Configuration of Cell PSCs 4.2 0 29 2.0 2.1 0.3 1.2 0.3 18 1.2 1.0 0.3 0.1 1.2 1.1 1.2 1.1 19 2.3 1.1 1.2 2.0 0.0 0.2 1.1 0.1 1.1 48 4 26 0.2 2.4 0.2 27 32 0.2 0.1 2.0 6 35 81 5 2.3 1.2 0.5 1.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only 2.0 2.6 2.3 2.2 2.1 1.1 0.1 2.1 0.0 0.1 1.1 2.2 0.1 54 0.0 1.2 0.3 0.4 2.4 0.5 0.3 0.2 1.0 74 7 66 2.1 2.6 1.3 1.1 1.3 2.1 14 15 75 0.1 62 2.2 0.4 0.3 0.1 2. 2 vary with K. you can allocate the PSCs repeatedly with the unit of this cell cluster.3 ) To ensure the PSCs of all the neighboring cells in the same scrambling code group. as shown below: K D2 3R 2 ( 4.1. For the neighboring hexagon cells distributed equably. the cell using the same PSCs as the primary cell is located at the point crossing two cells toward south or other directions then crossing one cell after tuning 60 o counterclockwise.0 0.5 0.2 0.1. 4. as long as no repetition with the neighboring cell. 10-4-30 All rights reserved. for the cases of neighboring cells distributed equably and the remote cells without interference to each other. 0.2 Planning Method It is recommended to use the area division method for the manual planning of cell PSCs.6 0.1 0. and then calculate the number of available PSCs with the formula 4. the parameters i and j are 2 and 1 respectively. the PSCs can be planned at will. you need to estimate the minimum reuse distance according to the neighboring cells and adjacent cells first. we can find this law from Figure 14 in Section 4. In the manual planning.2 0. that is.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only When the number of cells to be planned is less than 512. Page 29 of 31 . preventing the PSCs from being allocated to too many scrambling code groups.3: In the case that PSCs available to the neighboring hexagon cells distributed equably with the consideration of only neighboring cells generate interference.1 0.3 0.6 0. In this case. the maximum number of available scrambling code resource is the number of cells to be planned.4 0. The values of i and j calculated with the formula 4. as shown below.2. Therefore. after defining a cell cluster. K being 7.0 0. you should minimize the number of scrambling code groups as much as possible.5 0.3 0.4 Figure 15 Manual PSC Planning For the remote cells without interference. 5 0.1 0. the adjacent cell with interference cannot use the same PSCs as the primary cell.8 1. For the dense cells distributed equably.1 0. then the minimum reuse distance can be worked out with the formula 4.8 1.2 1.1 0.4 0.3 1.7 0.1 0.2 0.4 0.3 Minimum Reuse Distance and Scrambling Code Resource Reservation Comparing with the limited frequency resource of the GSM.3 0.4 0. The minimum reuse distance is the distance from the primary cell to the farthest adjacent cell.3 1.3 1.1 0. as shown below: 0. That is.8 1.1 0. Page 30 of 31 .5 0. it is recommended to reuse at least 12 PSCs (that is K is 12 and both i and j are 2.1 0.7 0.).2 0.2 0. that is 6R.6 0.4 0.4 0.3 1.2 1.5 0.2 0.3 0.2 0. but will be reserved for the future. we recommend reserving some scrambling code resource according to the number of cells planned in the network construction and the subsequent capacity expansion.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only 4.5 0.1 0. So the cell PSC planning in 3G is not so strict as the frequency planning of GSM.1.1 0. the scrambling code resource will not be used up.7 1.2 0.1 0.5 0.3 1.6 1.6 1.7 1.3 0.4 0. As there is no experience for large-scale planning.2 1.4 0.8 1.4 Figure 16 Minimize Reuse Distance Generally. But the reuse distance of the cell PSCs still need to make the signals received by all the UEs meet the requirement of carrier-to-interference ratio.8 1.3 1.2 0.3 1. 10-4-30 All rights reserved.7 0. the 512 PSCs for differentiating cells in WCDMS cell planning are relatively abundant.6 0.4 0.6 1.4 0. x Multi-Node Import Operation Guide. Page 31 of 31 . Achim Wacher. 2002/11/14 [3] Yao Jianqing. 2002/08/23 [2] Yao Jianqing. 2002/07/30 [5] Jens Zander.0 Planning Software Usage Guide V1. 2003/01/04 [4] Chen Jing. WCDMA RNP ENTERPRISE V4.ENTERPRISE Parameter Analysis Report. Radio Resource Management for Wireless Networks.0. WCDMA RNP ENTERPRISE V4. WCDMA RNP Technology Research on Special Topics – Code Planning Technology Research. WCDMA RNP Technology Research on Special Topics -. 2001/06/30 [6] Jaana Laiho. 2002 10-4-30 All rights reserved.WCDMA RNP Cell Primary Scrambling Code Planning Guidance For internal use only List of references: [1] Wang Mingmin. Seong-Lyun Kim. Radio Network Planning and Optimization for UMTS. Tomas Novosad. 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