Radio communications method

FIELD: radio communications.

SUBSTANCE: in each cell radio-signals of transmitters of base station system thereof cover at least two zones, one of which is inner zone, placed inside contour of radio-covering of cell and one into another, with zone contours, quasi-similar to contour of cell radio-covering, without any mutual intersections, while each zone is covered by radio-signals of radio-frequencies, selected for this zone, and also priority access for subscribers being in inner zone is provided, especially to radio-frequencies, assigned for servicing inner zone. Transceivers receive and transmit radio-signals, providing for radio-covering of inner zone, close to circular, at least one assigned radio-frequency and sector-wise radio-covering of outer zone at other radio-frequencies, assigned for servicing each sector.

EFFECT: higher capacity of mobile communications, frequency resource savings, decreased system interferences, guaranteed electromagnetic compliance with radio-electronic means of other communication systems.

3 cl, 4 dwg, 1 tbl

 

The invention relates to the field of communications, and more particularly to a method of radio communication in the communication system based on the principle of re-use of frequencies with multiple access.

The increase in the number of operators and cellular subscribers exacerbates the problem of rational use of frequency resources, and this requires developing ways to increase the efficiency of re-use of frequencies.

The invention allows to increase the capacity of the communication network for a given amount allocated for the operation of the system frequency bands (frequencies) or to provide the specified capacity of the system fewer radio frequencies, i.e. to save the frequency resource and, therefore, the number of transceivers, to improve the quality of communication, providing intersystem electromagnetic compatibility (EMC) while maintaining intra-system EMC, significantly reduce the total radiated power transceivers, implement options planning of communication networks depending on the tasks and goals and to increase the overall technical and economic efficiency of the system with all the components that affect its technical features and the full amount.

The invention relates to the cellular system, built in the form of a set of cells covering the serviced territory. Simplified cell performance is ablaut in the form of a hexagon, in the centre of which is the system base station (SBS), consisting of several base stations (BS), with service to all subscribers (otherwise user terminals (AT)) within its cell. When moving AT from one cell to another is the transfer of service from one BS to another or from one SBS to another (handover). All SBS system is closed, at least one switching center (CC), which controls the entire system and provides access to other communication systems. The overall management of the work of the Central Committee and the whole system is the Central controller that is part of the Central Committee and with powerful software including reprogrammable part.

Real contours (boundaries) of the cells have the shape of irregular curves, depending on the propagation and attenuation of radio waves, and are not clearly defined, the position of the BS also only approximately coincides with the center of the cell.

The principle of re-use of frequencies is the basic principle of cellular communication system, which allows to increase the system capacity and which to use in a close one relative to the other cells of different frequency bands and in their repetition across multiple cells.

In practice, cellular use three main methods of multiple access - sharing restricted the th site frequency spectrum by many users: frequency, time and code division communication channels (for example, patent RF №2104615, CL H 04 b 7/26). Also use abrupt rearrangement frequencies (U.S. Pat. Of the Russian Federation No. 2119255, CL is the same).

For any multiple access capacity of a wireless system with reuse of frequency bands raise several basic ways:

1) Go to the digital information processing and more perfect method of access from the frequency to the time and code.

2) Increase the repetition frequency, reducing the service area of the individual BS (crushing cells) and increasing the density of their placement in areas with heavy traffic. This is achieved by reducing the radiation power as BS, and AT decreasing the height of the suspension antennas and increase the angle of their pattern (Mavritansky. Basics of cellular communication. M.: Radio and communication, 2000. p.82; Technology and communication, 2002, No. 2, p.40).

3) To reduce the flow of handovers caused by crushing, assume the use of multilevel systems network building with service microsotf quickly moving AT, and microsotf - sedentary AT. At low traffic cells are not crushed, and enlarges.

4) Apply a multi-sectoral SBS (3, 6, 9, 12 sectors) using sectors directional antennas (U.S. Pat. Of the Russian Federation No. 2172072, CL H 04 b 7/26).

5) Assumes the use is their adaptive assignment of radio frequencies for frequency and time division multiplexing. In this case, the frequency resource is not given in advance in a certain way between the cells of the cluster, and the whole or part is in operational order of the Central Committee, which allocates them to use the base station upon receipt of the call, i.e. in accordance with the actual traffic, but subject to the necessary territorial-frequency separation (for example, Mavritansky, CIT., 83; U.S. Pat. Of the Russian Federation No. 2154901, CL H 04 b 7/26 ).

6) Increase the number of allocated radio frequencies.

To improve noise immunity radio system BS with the same frequency bands are removed from each other by a distance providing a given level socialnih, intersystem interference (Mavritansky. Basics of cellular communication. M, Radio and communications. 2000, section 2.4.2).

Known methods of radio communication aimed at increasing capacity and reducing intra-system interference communication systems. However, the fast development of mobile communication and investment in its creation and operation so large that you need a continuous further development, improvement, identify additional opportunities to improve technical and economic efficiency of communication systems.

As a prototype of the selected way radio RF patent No. 2223602, CL H 04 b 7/26, based on the principle of re-use of frequencies in the communication system, in which case signals the entire service territory, composed of cells, each cell of the radio transceivers of its system base station cover at least two zones, one of which is internal, nested in the path of the radio coverage of a cell and one another, with the contours of the zones, quasimodogeniti the contour of the coverage of the cell, without crossing each other, and each of the zones cover the radio signals of radio frequencies allocated to this area, while providing priority access subscribers located in the inner zone, primarily to radio frequencies allocated for servicing the interior of the zone.

The known method does not exhaust the potential to increase capacity and reduce system noise communication systems, saving frequency resource and therefore does not use reserves to increase technical and economic efficiency of communication systems.

The invention is aimed at increasing capacity and reducing intra-system interference, save frequency resources and increase efficiency of communication systems.

The distinguishing features of the claimed invention from the prototype is that it allows for a slight increase in the number of frequencies and maintaining EMC significantly increase the traffic communication system.

A method of radio communication, based on the principle of the re-use of frequencies and containing the essential features of the prototype: cover the radio the entire service territory, composed of cells, each cell of the radio transceivers of its system base station cover at least two zones, one of which is internal, nested in the path of the radio coverage of a cell and one another, with the contours of the zones, quasimodogeniti the contour of the coverage of the cell, without crossing each other, and each of the zones cover the radio signals of radio frequencies allocated to this area, while providing priority access subscribers located in the inner zone, primarily to radio frequencies allocated for servicing the interior of the zone.

Other significant distinctive features of the prototype features are the following: transceivers system base station transmit and receive radio signals, providing close to the circular radio coverage of the inner zone, at least one selected radio frequency and radio coverage sector external zone on the other dedicated to serving every sector of the radio.

In addition, the ratio of radius R2the inner zone to the radius R1the external zone is chosen predominantly in the rangewhere m is the number of sectors in the cell, k is the number of frequencies allocated to one sector, n is the number of frequencies allocated for servicing the interior of the zone.

Also p is amouretti systems base stations transmit and receive radio signals, providing radio coverage inside the radio frequencies, the most remote from radio frequencies occupied by the electronic facilities of other communications systems, located in the vicinity of the radio system.

The proposed method of radio communication increases technical and economic efficiency of the communication system through transmission and reception of radio signals in the inner, near-circular, the area of the at least one radio frequency and use of radio frequencies in other cells. This allows you to increase capacity, reduce intra-system interference, save frequency resource and consequently reduce the cost of cellular communication systems, and in some situations, in General, to ensure the possibility of its functioning.

Below the invention is described in more detail with reference to the drawings and a table schematically illustrating an implementation of the claimed method.

The method applies to both existing and projected cellular communication system different standards and can be used in conjunction with other known methods of increasing the efficiency of use of frequency resource, complementing and developing them and giving, as shown below, significant technical and economic effect.

The proposed method is as follows.

The method applies to the system with the ides, built in the form of cells with SBS, conventionally located in the center of each of them. SBS provides radio AT all, within the cell. All SBS functionally connected with the General of the Central Committee, which transmits service from one SBS to another when moving AT one cell (sector, zone) to another.

Transceivers (PP) SBS, and, accordingly, subscriber terminals located within the cell, transmit and receive radio signals on radio frequencies allocated for radio frequency bands, in the aggregate of radioactiva the entire area of the cell. The required number of frequency bands used in the cell, repeat in a few cells on the scheme providing the desired socialnew electromagnetic compatibility, as is common in communication systems based on the principle of re-use of frequencies.

Each cell is subdivided at least into two zones of coverage, one of which is internal with a nominal radius R2and the second is in relation to it external with a nominal radius R1. All the radio coverage invested in the path of the radio coverage of a cell and one another and have contours, quasiedible the outline of coverage, covering the cell. The contours of the radio coverage must not overlap with each other. The inner zone has the largest number is, and outside the first room. It is significant is that each of the zones cover the radio signals of radio frequencies allocated for maintenance of this area in the cell.

The required number of frequencies used in a cell re-use in every other cell or a few cells, not necessarily identical circuits, which provides the required communication quality, socialnew electromagnetic compatibility.

The following are the steps for providing access to AT radio frequencies. Namely, access to AT radio frequencies by prominent means of allocation of radio frequencies (for example, from U.S. Pat. Of the Russian Federation No. 2154901, CL H 04 b 7/26 ) specified in a particular communication system order, but with the following priority. Primarily provide access AT located in the inner zone, to the radio frequencies allocated for servicing the interior zone. These frequencies can be available in two cases: 1) AT is outside the radio coverage of these frequencies, and 2) AT is in the area of coverage of these frequencies, but they are fully occupied. In such a situation in the prototype provide access to the radio frequencies allocated for servicing the external zones (two zones). With a larger number of zones this process is sequentially repeated until the access to the radio frequencies allocated to ensure radioport the I entire area of the cell.

The control signals are valid throughout the cell via dedicated radio frequencies outside zones.

To achieve a technical result of the invention shall take the following actions.

Transceivers SBS transmit and receive radio signals with providing close to the circular radio coverage of the inner zone, at least one radio frequency allocated to services within it AT. Sector external radio coverage area to provide other allocated for each sector of the radio.

The implementation of the prototype method is shown schematically in figure 1, the inventive method is in figure 2, 3, 4. The radio system is presented in the form of fragments of the set of cells covering the serviced territory.

Figure 1 is a cell are, for example, from two areas: internal (int), external (EXT)covered by the outline of coverage (outline). Shows the radii of the zones of coverage.

Implementation of the proposed method is demonstrated on a simple example of a 4-element, 3-sector cluster (figure 2, 3, 4). Cells of the same cluster are indicated by letters A, B, C, d Within each cell, for example, shows two radio coverage with SBS, conditionally placed in the center of the cell. Each PP transmits and receives radio signals only on a dedicated radio frequency. The inner zone is close to circular and f is Data2-4 indicated by the numeral 13. For her service in all cells of the cluster selected at least one radio frequency f1(figure 2). The outer zone of the cell is formed as three sectors allocated for their maintenance radio frequency indicated by the numbers 1-12. The radio signals of all frequencies 1-12 and f1cover the entire cluster.

Implementation of access AT the radio show on the example of a single cell. Let AT is in the inner zone of radio coverage served by a radio frequency f1at the point E. Then it provides access primarily to the radio frequency f1. If the radio frequency f1will be occupied, AT provide access to the second stage - to 8 radio frequency allocated to the service sector, which reaches point E.

Now suppose that AT is at point F in the external zone in the sector with radiofrequency 8. Then it is not available radio frequency f1and granted access to the radio frequency 8.

In the vicinity of this radio system can be electronic funds other Radiocommunication systems operating on some frequencies. In this case, the transceivers systems base stations transmit and receive radio signals, providing radio coverage inside the radio frequencies, the most remote from radio frequencies occupied by the electronic facilities of other communications systems, which is the neighborhood of the given radio system.

The density AT (number AT per unit area) can be considered with sufficient accuracy the same throughout the service area.

The ratio of the radii of the inner and outer zones, obtained from the condition of equal to AT radio frequencies, for a homogeneous network model has the form (refer above)

For a real network, this ratio is chosen predominantly in the range

In practice, specify the number of radio frequencies for maintenance of the respective radio coverage.

The inventive method allows enough flexibility in the planning of the network depending on the specific situation and challenges. For example, in the cluster to service the internal zones of cells, you can specify: 1) the same radio frequency f1for all zones (figure 2), 2) the same radio frequency remote from each other areas (for example, f2in cells b and D, figure 3) and different for the areas located closer to each other (for example, f1and f3in cells a and C, figure 3), 3) different radio frequency f1f2f3f4for all zones in the cluster (figure 4). You can use this reduced power transceivers that provides additional environmental and techno-economic advantages. When increasing the dimension of the cluster within the Appl is imago way to get more options assignments of radio frequencies, capacities and their combinations for servicing the interior zones.

Efficient and high quality system of cellular communication with providing intersystem EMC and EMC with other electronic means, for example with the aerodrome by means of near field navigation and landing, perform optimally tailored to the specific requirements of the radio system.

The use of the claimed method of radio communication can increase the capacity of communication systems. Here are a few simple examples:

1) cellular communication System consists of four sector clusters (example shown in figure 2). If the inner zone of the claimed method is not provided, then you need 12 channels and the traffic of one cluster is ~ 12. Let the selected one radio frequency to maintain a single sector of the external zone, and for servicing the interior zones 1, or 2, or 3 radio frequency. Then while ensuring fairness AT adding in the cluster one radio frequency in the inner zone increases traffic by 33%, two is 67%, three at 100%. When the number of radio frequencies in the inner zone grows R2and it is necessary to control the conditions for intra-system EMC.

2) radio System constructed according to example 1, but the service sector is allocated 2 RA is iocality. If the inner zone of the claimed method is not provided, the required 24 radio frequency and bandwidth of a single cluster ~ 24. Let for servicing the interior zones 1, 2 or 3 radio frequency. Then while ensuring fairness AT adding to the cluster one radio frequency in the inner zone increases traffic by 17%, two - by 33%, three at 50%. When the number of radio frequencies in the inner zone grows R2but slightly easier providing intersystem EMC compared with example 1.

3) a communication System constructed according to example 1, but the service sector is allocated 3 radio frequency. If the inner zone of the claimed method is not provided, the required 36 radio and the traffic of one cluster ~ 36. Let for servicing the interior zones 1, 2 or 3 radio frequency. Then while ensuring fairness AT adding to the cluster one radio frequency in the inner zone increases traffic by 11%, two - by 22%, three - 33%. When the number of radio frequencies in the inner zone grows R2but is facilitated by the provision of intra-system EMC compared with examples 1 and 2.

The results of the evaluation of the effectiveness of the proposed method for these three examples in more detail is shown in the table.

The claimed method of radio communication is universal and can be riment in combination with other methods when used on SBS as antennas with circular pattern, and sector antennas, and multi-level schemes of recurrence cellular communication network. We also note the following important circumstance. When creating a cellular network due to the high investment, the operators at the initial stages of construction of their systems aim to provide maximum area coverage with a small number AT. The subsequent increase subscriber capacity by increasing the number of SBS, sectorization and multiplying the number of channels occurs after entering the system in operation. This approach requires a simple increase in the number of PP SBS, but it may entail a complete change in the structure of their antenna-feeder equipment (AFO). In order to minimize the costs of modernizing the AFO that includes not only the actual cost of the equipment, but also quite time-consuming installation work, it is necessary at the initial stage of network design to provide for the further development of the overall system and possible changes in the structure of individual SBS. The use of the claimed method of radio communication greatly reduce these difficulties, and in some cases eliminate them.

Thus, the distinctive features of the proposed method radiocommunications provide new properties that are not achievable in the prototype and the like. The analysis allowed the becoming: analogues with a set of features, identical to all features of the claimed technical solution is available, which indicates compliance with the stated method of communication the condition of “novelty”.

The results of the search of the known solutions in the field of communication in order to identify characteristics that match the distinctive features of the prototype of the characteristics of the claimed method of radio communication, showed that they do not follow explicitly from the prior art. Also revealed no known effect provided the essential features of the claimed invention of actions to achieve a specific result. Therefore, the claimed invention meets the condition of patentability “inventive step”.

1. Way radio communications in the cellular system, in which the entire service area consists of a set of cells, each of which has at least two zones, one of which is internal, based on the principle of re-use of frequencies covering the entire service area in which the radio transceivers of the base station cover at least two zones, one of which is internal, nested in the path of the radio coverage of another cell, with the contours of the coverage area of the radio frequency signal quasimodogeniti path coverage of a cell without crossing each other, and each of the zones cover radiosignal the s RF allocated to this area, while providing priority access subscribers located in the inner zone, primarily to radio frequencies allocated for servicing the interior area, wherein the transceivers of the base station transmit and receive radio signals, providing close to the circular radio coverage of the inner zone, at least one selected radio frequency and radio coverage sector external zone on the other dedicated to serving every sector of the radio.

2. The method according to claim 1, characterized in that the ratio of radius R2the inner zone to the radius R1the external zone is chosen predominantly in the rangewhere m is the number of sectors in the cell, k is the number of frequencies allocated to one sector, n is the number of frequencies allocated for servicing the interior of the zone.

3. The method according to claims 1 and 2, characterized in that the transceivers systems base stations transmit and receive radio signals, providing radio coverage inside the radio frequencies, the most remote from radio frequencies occupied by the electronic facilities of other communications systems, located in the vicinity of the radio system.



 

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