MXPA99005993A - Frequency assigning method for an eight cell frequency re-use plan - Google Patents

Abstract

A cell cluster for use with a frequency re-use pattern is disclosed. The cell cluster comprises eight antenna sites arranged in first and second adjacent columns having four sites associated with the first column and four sites associated with the second column. Frequency groups are assigned to each of the antenna sites such that no adjacent channel interference exist between the antenna sites or between any similarly configured cell clusters associated with the cell cluster.

Description

METHOD OF ALLOCATION OF FREQUENCY PAPA A REFUSAL PLAN JQE FREQUENCY OF EIGHT CELLS - BACKGROUND OF THE INVENTION Technical Field of Xa. INVENTION Xa invention of the invention, with reuse structures of fra uenci, and. more to participate in the structure of the recession structure. which includes groups of eight cells that eliminates suhs.tancialman £ the ijrtexiarencia of the adjacent channel, Demerging the Technique iBelacio.r? Aíia J The frequency reuse patterns of cell-based structures, by which the frequency channels within a cellular radio system ST allocate. the. basic .m of any pattern of reuse of frequency S juna celd. Each cell in a frequency pattern of frequency. Assigns a number of frequency channels. A group of associated cells together is called a has. A beam contains all the available channels for a cellular radio system, the groups of beams are then used to provide a cellular coverage through a specific area for a cellular system. association of all frequency channels within a single beam allows for the use of irequency channels through the cellular system, the beams are structured and the frequencies within the beams assigned to increase the distance of rejection and To limit adjacent co-channel and anal interference, co-channel interference consists of interference caused between uses of the same frequency within two different cell counts. The adjacent channel is caused by interference between adjacent irequency channels within the same beam: or within two different beams, in order to reduce interference within the cellular system, they must be minimized. both, the co-channel and adjacent channel inierlaranria, competing with these requirements is the need for increased system capacity. In general, the smaller number of cells used in a beam within a mobile radio system is the higher the capacity of the system and the lower the co-channel reuse distance, a distance of co-channel xeuso. Less, of course, increases 1® co-channel interference irequency reuse patterns have been studied extensively in the cellular industry. The frequency reuse patterns that minimize at least the inter- channel channel interference have been proposed for cells of more than nine cells in size, however, claims have been made in existing studies that interference of adjacent channel can not be avoided when the number of cells in a beam is less than nine, the frequency reuse patterns of the stenfes using less than nine cells, all suffer from the problem of adjacent channel inferiarancia, a system that would allow the use of beams that include less than nine cells with improved channel capacity, provide good co-channel inferiation characteristics, and substantially eliminated problems of adjacent channel interference will greatly benefit the users and suppliers of the channel. Calpe talé-fono services.

COMPENDIUM OF THE INVENTION Xa presents invention overcomes the above and other problems with an improved beam of cells to be used with a irequency reuse pattern, In a first embodiment, the cell ñaz consists of eight cells' arranged in first and second adjacent columns horizontal, vertical, or diagonal - Both columns include four cells and form a beam in a rectangular configuration. Eight different frequency groups are assigned to each of the eight cells, each frequency group consists of non-adjacent frequency channels, and the allocation of the eight frequency groups is such that there are no adjacent channels between any of the eight cells , nor are there adjacent channels with any similarly configured cell beams associated with the eight cell beamThe beam of cells described above works with an omnidirectional configuration in which eight directional antennas are placed in the center of each of the eight cells and with an excited, sectorized cantral antenna configuration, where each of the eight groups of The sequence also includes three secondary groups. Each of the secondary groups associated in a frequency group does not include any adjacent radio channels. In a second modality, eight antenna sites are arranged in the first and second, adjacent columns or spheres, where each column or row includes four antenna sites, each antenna site has three cells associated with the same cell, uses three directional antennas, and uses a beam of twenty four cells. Placed in each antenna site are antennas of three different sizes, which transmit to the three cells with the antenna site. Eight frequency groups, consisting of three secondary groups, each with no adjacent frequency channels, are assigned to each of the antenna sites, with each stream receiving a secondary group such that there are no adjacent frequency channels between any of the twenty-four cells associated with the eight antenna sites and there are no adjacent channels with any similarly configured bundle of bundles associated with the bundle of cells.

BRIEF DESCRIPTION OF THE DRAWINGS. For a more complete understanding of the present invention, reference is made to the. following detailed description, taken in conjunction with the accompanying drawings, wherein: Xa E Fig. 1 is an eight-cell .haz diagram using the omnidirectional antenna configuration that provides no adjacent channel interference within the same beam: Xa Figure 3 shows an illustration of the frequency reuse plan for a beam of _NDS cells using the .multi-directional antenna configuration that does not provide adjacent channel interference between two different beams; Xa Ügura is an illustration of an excited sectorized antenna configuration, centered within an eight-cell beam based thereon, wherein each of the eight frequency groups further includes three separate secondary groups that do not provide adjacent channel interference within the same .haz; Xa.Figure á is an illustration of a frequency reuse pattern for a beam of JN = 8 cells using the sectorized antenna configuration excited to the channel that does not provide adjacent channel interference between two different beams Xa.Figure 5 BS a üusfraci ? n of a cloverleaf configuration that uses a ha2 structure; and Xa Figure 6 is an illustration of the frequency reuse pattern for cloverleaf conriguration.

DETAILED DESCRIPTION OF THE INVENTION Referring now to the Drawings, and more particularly, to Figure 1, the basic .haz for an omnidiractional pattern is illustrated .N = S, sn where JN is equal to the reuse number of. Frequency Cal number of csldas) in a beam. The pattern is a square-shaped cell of rectangular configuration that has four cells 12 vertically aligned immediately adjacent to each other, four cells 14 vertically aligned, giving an arrangement of 2 cells, Xete pattern, and the scheme gives frequency assignment associated with the same, which will be discussed. more fully in a moment, provide all the basic properties; of a conventional reuse pattern, such CBKSO ^ capacity of repetition, capacity of division and capacity of application. On the other hand, the two columns 12, 14 of four cells can be arranged horizontally or diagonally rather than specifically, The plan of U = proposed evacuation for an omnidirectional antenna site as shown in Figure 1, is used to divide all the available fractional channels into eight or multiples of groups from eight frequencies with approximately t / S channels per group, where t the total number of channels available in the spectral Xanda designated by the authority, Table 1 shows the channel assignments Group? E Frequency Channel a b c d e I Q n Number of 1 2 3 4 5 B 7 B Tans 3 10 .11 12 13 14 15 1 £ 17 IB 13 Z? 21 11 .23 2a Table 1 As can be seen from Table 1, each of the irequency channels are sequentially assigned to each channel group at the same frequency. A frequency channel group is then associated with each cell in a manner that removes the adjacent frequency channels within the .haz and with adjacent hacos, the same sequences after being assigned to a primary beam can then be reused by others. .is made of coniority with the same assignment configuration to proportional cellular coverage iin through a specific area, the beam gives eight basic cells uses an odd and even channel distribution scheme, where the odd and even channels in the beam Basic form two vectors, A and JB. co or follow: g d e b A B c h a f JE1 Vector a contains four channel groups of irec.uen.cia and Vector B fmblan contains four groups of channel -frequency. .. The Vector A flag assigned to one column and Vector B is -assigned to the other cell. As can be seen, the adjacent channel groups are diverted by at least one other channel group either vertically or horizontally to eliminate the possibility of adjacent channels of speech within the .haz.From this point, the groups of adjacent channel of frequency are each separated from each other by at least one other group, the eight-cell line is associated in a frequency reuse pattern as shown in Figure 2, With each beam, the channel frequencies assigned to the cellular system are reused, due to the basic beam configuration of the amphile site. omnidirectional N = 8, it is only possible to expand the basic beam in the vertical and horizontal directions. This provides a repetitive frequency group sequence for the structure of Figure 2, which limits the co-channel interference and eliminates the adjacent channel interference as shown in Table 2- a f a f c h c h e b e g g g g g g g g f f f f h f h g h g e g g g g g 2 As can be seen from Table 2, the co-channels in the horizontal direction are always separated by a cell (with a center-to-center distance of 3R, where P is the cell radius) from the cell that serves on each side, the co-channels in the vertical direction are always separated by three cells (with a center-to-center distance of 8P), and the co-channels in the diagonal direction are separated by the center-to-center distance of 3R in the horizontal direction and 8R in the vertical direction. This provides co-channel interference performance that is on par with or slightly better than a normal seven-cell .haz configuration. The most important feature of the omnidirectional antenna pattern U = S is that it is free of adjacent channel interference within dBl .haz as well as between two different beams. In this way, while this particular frequency reuse pattern provides less traffic capacity than a normal JN = 7 system, the freedom of adjacent channel inierierencla greatly reduces the total inferrence within a mobile telecommunications system. In the case of a mobile telecommunication system, interference consists of noise plus adjacent channel interference, more co-channel interference, since noise is limited in the mobile telecommunications environment, this means either adjacent channel interference or co-channel or both that should be reduced. Since this configuration provides approximately equal or slightly better co-channel interference, the elimination of adjacent channel interference improves the operation of the system. The frequency reuse pattern of the present invention can also be used with a sectorized antenna cell configuration. For a three-sector directional antenna site, this configuration would use 24 frequency groups in a reuse pattern of eight sites that has approximately i / 24 channels per group. This type of channel assignment is illustrated in Table 3.

Frequency Channel Group JLnumber 11 hl cl i ßl ± 1 gl hl a.2 bl c2 di t2 gl h d? i 1 3 A 5 .6 7 7 3 10 11 1213 la 15 16 Channel 15 26 27 28 29 30 31 32 33 34 3536 37 38 39 40 a.3 h3 c3 d3 on ± 3 g3 h3 17 18 19 20 21 22 23 24 al á2 43 44 45 46 47 4.8 Table 3 As can be seen, each frequency group (a, b, c, d, e, i, g, h) is divided into three separate secondary groups (al, a2, a3: bl, b2, b3, cl, c2, c3; etc.), and frequency assignments of the subfrequency groups are made to each sector. The excited sector center cell and the frequency plans are direct extensions of the omnidirectional antenna configuration. The method of frequency group assignment is the same as that of the omnidirectional antenna pattern, except that each frequency group in the sectorized plan is divided into three secondary groups in each location. For example, the frequency group a in the omni-directional plane is now divided into frequency groups a, a2, a3; frequency group b is divided into groups of frequency bl, b2. b3; etc. The frequency groups al, a2, and a3 are then assigned to the three sectors of a sectorized site, Two different sectorized cell patterns are available, namely, excited patterns to the center and cloverleaf cell. Figure 3 illustrates a beam of directional antenna patterns of three sectors, excited at the center. Each site contains a single antenna site 18 with three sectors 20 having antenna azimuths separated by 12QS. It should be understood that even when Figure 3 is described with respect to a three-sector configuration, other configurations of multiple sectors may be used. Each sector 20 is approximate to the configuration of a diamond. Each sector 20 can use, for example, transmission antenna of 60a, 909 or 120s and two corresponding diversity receiving antennas with the same azimuth of aim. The divisions of patterns of three sectors excited at the center divide the hexagon representing the site into three diamonds and assign a frequency group that has the three secondary groups in each site, the three subgroups of a SB channel target group allocate each site sector 20 as illustrated in Fig. 3, while continuing to reattach to Figure 4, as with the configuration of antenna or nidirectional, the Jbaz configuration of the configuration excited to the center of three sectors only allows expansion in the vertical and horizontal directions. This configuration provides co-channels separated in the horizontal direction by a distance of 3R (center to center) from the cell that serves on both sides, Xos co-cahales in the vertical direction are separated by a distance of 4 SB (center to center), Co-channels in the diagonal direction are separated by 3R in the hori óntai direction v 4 - « ^ P in the vertical direction, there are eight co-channel interiers in the first row of co-channel. Again, as in the omnidirectional antenna plan. there are no adjacent channels assigned to adjacent cranks, sectors or beams, and thus, there is no adjacent channel interference. Referring now to Figure 5, there is illustrated a cloverleaf configuration beam for an antenna pattern Directional three-sector, sectorized Xa site geometry includes after cells at each antenna site, where the antenna pointing azimuth dß each cell is separated by 12BS and the cells are arranged in a trefoil leaf every cell is approximately of the configuration of a hexagon and uses, for example, transmission antenna of 60a, 30a or 120a and two corresponding diversity receiving antennas along each azimuth of antenna pointing, The trefoil pattern consists of three cells in the center of which is a location and antenna Each antenna site is assigned to a frequency group that includes three secondary groups in the same way as that one In this way, each site would include a frequency assignment 11. a2, a3: bl, b2, b3; etc., as shown, The relationships for the assigned frequency channels of the eight antenna sites used by the trefoil pattern are the same as those for the frequency channel assignment relationship with respect to an omnidirectional configuration or sectorized excited to the center, The antenna sites are arranged in a substantially rectangular or parallelogram configuration. Instead of being placed within the center of a single cell, the antenna site is placed at the intersection of three adjacent cells. The beam reuse pattern for the cloverleaf configuration is illustrated in Figure 6, because of the configuration of basic beam of the directional sectorized plane 8/24. it is only possible to expand the basic beam vertically and horizontally, as can be seen in Figure 6. the co-channels in the horizontal direction are always separated by a distance of 6R (center to center) from the cell serving on both sides and 12P (center to center) in the vertical direction. The co-channels in the diagonal direction are Sr separated in the horizontal direction and I2P in the vertical direction. There are a total of eight co-channel interferers in the first row of co-channel again, there are no adjacent channels assigned to adjacent cores. Within the beam and no adjacent channel interference between the beams occurs, Due to the directional capability of the antenna, the co-canals placed in the vertical and diagonal have more impact on the co-channel infer- rance, while the channels placed in the horizontal they have less impact with respect to the cell that serves However, the co-channels placed in the vertical have a separation distance that deflects the impact of the co-channel interference resulting from Jla's directional capacity, antenna. Although preferred embodiments of the method and apparatus of the present invention have been illustrated in the accompanying drawings, and are described in the above Detailed Description, it is understood that the invention is not limited to the described mode, but is capable of numerous rearrangements, .modifications and substitutions, without abandoning the invention as or is set forth and delineated by the following claims,

Claims (3)

1. 8 - JREIV1NDICACIQNES 1, - A beam of C & ldas to be used with a reuse pattern, where the cell beam is characterized by: eight cells arranged in first and second adjacent columns, where the first column includes four cells and the The second column includes four rows, and eight frequency groups assigned to the eight cells, so that there are no adjacent channels between any of the cells once each of the frequency groups is assigned to a 2 - row. The cell beam of claim 1, wherein the location of the eight cells with other similarly arranged arrays of eight cells does not create adjacent channels between cells of any adjacent beams, 3, - The cell. Of cells of claim 2. wherein the. .horizontal 'distance between co-channels is 3JP. , á, - JThe beam of cells of the. claim 2, wherein the vertical distance between co-channels and cells is 8R, 5, - The cell stack of claim 2, e? where the diagonal distance between co-channels is 3JR in the horizontal and 8JR in the vertical, £, - The cell beam of the. claim 1, which further includes omnidirectional antenna sites associated with each of one of the eight cells, the bundle of cells of claim 1, which also includes seetorized antenna sites placed in the center of each of the eight cells , 8, - JThe beam of cells of the. claim 7, wherein the horizontal distance between co-channels is 3.R, 9. - The cell stack of claim 7, wherein the vertical distance between co-channels is a jR. 10, - The cell stack of claim 7, wherein the diagonal distance between co-channels BS 3JR in JLa horizontal and 4 ÜR in the vertical, 11, - The Jhaz of csldas of claim 1, wherein eight g. of frequencies are designated a,. b, c, ri, e, i, g and h, respectively, and the order channels are assigned to. from the group a of frequency to the group h of frequency in a repetitive form and sequence! , 12, - The cell stack of claim 1 wherein no two adjacent frequency groups are assigned to physically adjacent cells of the cell. 13 - A frequency reuse system, characterized by: eight antenna sites associated together in a repetitive pattern; and eight frequency groups assigned to the antenna sites so that no two antenna sites have adjacent frequency channels between them once each, one of the frequency groups are assigned. the . - The frequency rause piano of claim .13, wherein the antenna site comprises a sectorized antenna site that transcends signals in three cells arranged in a cloverleaf shape, 15, - The frequency reuse plan of claim 13, wherein the horizontal distance between co-channels is 6JR. 16 - The cell bundle of claim J 3. where J The vertical distance between co-canaies is 12K, 17, - The cell stack is referred to claim 13, where the distance, diagonal between co-channels is 6R in the horizontal and 12R to the vertical, 18, - One beam of cells for use with a frequency reuse plane, characterized by: eight cells arranged in first, and second adjacent vertical columns, wherein the first column includes four cells and the second column includes four cells: eight groups of frequency which consist of non-adjacent frequency ds channels in each group of irencence, in the case of one of the eight frequency groups are assigned to one of the eight cells so that there are no adjacent channels between any of the cells with the eight cells and any beam of cells similarly configured associated with the Jhaz da cells, 19, - The cell beam of claim IB, which also includes omnidirecclona antenna sites! associated with each, one of the eight caldas, 20. - The beam d &; caldas of claim 18, which also includes sites of antiquity. sectored placed in the center of each of the eight cells. 21, - The cell stack of claim i.8, wherein the eight frequency groups are designated a, b, c, d, a, i, g, and h, respectively, and all the frequency channels are assigned from group a of frequency to group h of frequency in a repetitive and sequential manner! , 22. - The beam of cells of claim 1.8, wherein the groups frequently include secondary groups that have non-adjacent frequency channels assigned to them, SUMMARY OF THE INVENTION A bundle of cells is described for use with a frequency-reuse pattern. The bundle of cells comprises eight antenna sites arranged in first and second adjacent columns having four sites associated with the first column and associated with the second column. . The frequency groups are assigned to each of the antenna sites so that there is no adjacent channel interference between the antenna sites or between similarly configured cell beams associated with the cell beam.