RU2323535C2 - METHOD FOR TRANSFERRING SERVICE OF CLIENT STATIONS IN A HYBRID WIRELESS NETWORK ACCORDING TO STANDARDS IEEE 802.16e OFDMA, IEEE 802.11b AND cdma 2000 1xEV-DO - Google Patents

Abstract

FIELD: radio engineering, in particular, method for transferring service of client stations in a hybrid wireless network according to standards IEEE 802.16e OFDMA, IEEE 802.11b and CDMA 2000 1xEV-DO; possible use, for example, in a hybrid wireless network compliant with standards IEEE 802.16e OFDMA, IEEE 802.11b and CDMA 2000 1xEV-DO.

SUBSTANCE: technical effect is achieved due to minimization of maximal load on a sector in each subset of the set of all sectors of a hybrid wireless network during selection of new set of servicing sectors, and also due to transfer of service of client stations only to those sectors, where service quality requirements are fulfilled for all client streams of these client stations.

EFFECT: increased efficiency of hybrid wireless network compliant with IEEE 802.16e OFDMA, IEEE 802.11b and CDMA 2000 1xEV-DO standards during transfer of service of client stations between sectors of a hybrid wireless network, while fulfilling service quality requirements for all service streams of all client stations of a hybrid wireless network.

1 cl, 11 dwg

Description

The invention relates to the field of radio engineering, in particular, to a method for handing off subscriber stations in a hybrid wireless network according to IEEE 802.16e OFDMA, IEEE 802.11b and cdma2000 1xEV-DO standards. It can be used, for example, in a hybrid wireless network according to IEEE 802.16e OFDMA, IEEE 802.11b and cdma2000 1xEV-DO standards.

In the structure of the global system of high-speed wireless communications, a significant place is occupied by fixed and mobile high-speed wireless access systems. These include wireless networks according to IEEE 802.16е OFDMA, IEEE 802.11b and cdma2000 1xEV-DO standards. Currently, wireless networks according to IEEE 802.11b and cdma2000 1xEV-DO standards are already widespread throughout the world, and their number continues to grow rapidly. Moreover, the service areas of these networks often overlap. It is assumed that wireless networks according to the IEEE 802.16e OFDMA standard will also be deployed at the sites of existing wireless networks according to the IEEE 802.11b and cdma2000 1xEV-DO standards. At the same time, the number of hybrid wireless networks consisting of several wireless networks, working on the basis of various standards, but functioning as a whole, is steadily growing. New universal subscriber stations capable of working in hybrid networks are constantly being developed. International standardization organizations have already begun to standardize the mechanisms for transferring subscriber station services between sectors of hybrid wireless networks (see IEEE Project P802.21, Draft IEEE Standard for Local and Metropolitan Area Networks: Media Independent Handover Services, Draft 0, July, 2005 [1 ]).

IEEE 802.16 Standard (see IEEE Standard 802.16-2004, IEEE Standard for Local and Metropolitan Area Networks - Part 16: Air Interface for Fixed Broadband Wireless Access Systems, October 1, 2004 [2] and IEEE Standard 802.16e - 2005, Amendment to IEEE Standard for Local and Metropolitan Area Networks - Part 16: Air Interface for Fixed Broadband Wireless Access Systems - Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands, February, 2006 [3]) describes the physical layer requirements and MAC (media access control) for fixed and mobile high-speed wireless access systems. The standard includes most of the key modern technologies, such as handover mechanisms of subscriber stations between sectors of the wireless network (BUT), quality of service support (QoS), adaptive coding and modulation, power control, orthogonal frequency data transmission technology subcarriers (OFDM - orthogonal frequency division multiple access). This provides great opportunities for optimizing wireless networks according to the IEEE 802.16 standard.

OFDM technology has developed the development of OFDMA multiple access, which is a very good solution for transmitting multimedia data, while ensuring quality of service requirements. OFDMA multiple access provides a convenient opportunity to adaptively allocate a time-frequency resource, assign transmission power and coding and modulation schemes to service streams with different requirements for the quality of service. When allocating a time-frequency resource in OFDMA multiple access, two approaches are possible: frequency diversity and multi-user diversity. Both are aimed at combating frequency-selective fading.

In frequency diversity, all subcarriers of one user are pseudo-randomly distributed across the entire OFDM signal spectrum. This operation is called interleaving in the frequency domain. In the presence of frequency selective fading, it is likely that neighboring subcarriers will fall into the region of significant fading. After frequency interleaving, the probability that all subcarriers of one user pseudo-randomly spaced throughout the signal spectrum fall into the fading region is significantly reduced, which increases the noise immunity of the transmission. When using frequency diversity, the reception conditions for a particular user station are characterized by average conditions over the entire spectrum of the signal.

IEEE 802.11b (see IEEE standard for Wireless LAN Medium Access Control and Physical Layer specifications, ANSI / IEEE Standard 802.11, 1999; IEEE standard for Wireless LAN Medium Access Control and Physical Layer specifications: higher-speed physical layer extension in the 2.4 GHz band, IEEE Standard 802.11b, 1999 [4]) is a widespread standard that describes a wireless local area network data transmission. Consider some of the main features of the standard that are necessary for a better understanding of the claimed invention.

The physical layer of the IEEE 802.11b standard provides four transmission speeds: one, two, five and a half and eleven Mb / s. The noise immunity characteristics of the physical layer of the IEEE 802.11b standard are completely determined by the dependences of the probability of bit error on the signal-to-noise ratio (SNR).

The data blocks arriving at the MAC layer are divided into one or more fragments before transmission. A fragment of a data block cannot exceed 18432 bits. To transmit each fragment of the data block, a separate data packet is formed. A data packet consists of a MAC header, a data block fragment, and a checksum and is transmitted at one of four transmission rates. Before each data packet at a transmission rate of one Mbit / s, the preamble and the header of the physical layer with a total duration of 192 μs are transmitted.

The work of wireless local area networks according to the IEEE 802.11b standard is based on competitive access to the transmission medium. A station that has a data block for transmission must determine the current state of the transmission medium. If the station detects that the transmission medium is free for a time interval equal to the base interval between packets, then it starts transmitting data. If the station detects that the transmission medium is busy, then it must delay transmission until the transmission medium is found to be free for a time interval equal to the base interval between packets. Thus, the station avoids collision when the transmission medium is busy.

Data packet transmission begins with the concurrent access interval. The start of the concurrent access interval is the same for all stations having a data block for transmission. Each of them randomly selects the duration of their competitive access interval as a value of a random variable uniformly distributed within specified limits. Access to the transmission medium is obtained by the station that has chosen the interval of the shortest duration. She begins the transmission of her data packets, having previously waited for her interval of competitive access.

If the interval of the shortest duration coincided with two or more stations, then they begin to transmit their data packets simultaneously. In this case, a collision occurs, i.e. overlay of their data packets in time. In a collision, most likely one of the data packets will not be accepted.

For the transmission of any data packet, the IEEE 802.11b standard has two mechanisms, i.e. options, data transfer: the main data transfer mechanism and the data transfer mechanism with a preliminary transfer request.

When using the basic data transfer mechanism, the following data transfer sequence is used. A station that has won competitive access starts transmitting a data packet immediately after the end of its competitive access interval. If the data packet is successfully received at the receiving station, the receiving station transmits an acknowledgment at a time interval equal to the short interval between packets. If the acknowledgment is successfully received at the transmitting station, the data packet is received successfully.

When using a data transfer mechanism with a preliminary transfer request, the following data transfer sequence is used. A station that has won competitive access starts transmitting a transfer request at the end of its competitive access interval. If the transmission request is successfully received, the receiving station transmits the transmission permission at a time interval equal to the short interval between packets. In case of successful reception of a transmission permit, the transmitting station transmits a data packet at a time interval equal to the short interval between packets. If the data packet is successfully received at the receiving station, the receiving station transmits an acknowledgment at a time interval equal to the short interval between packets. If the acknowledgment is successfully received at the transmitting station, the data packet is received successfully.

The cdma2000 1xEV-DO standard (see TIA / EIA, IS-856, cdma2000 High Rate Packet Data Air Interface Specification, October, 2000 [5]) is a widely used standard that describes a cellular data network. Consider some of the main features of the standard that are necessary for a better understanding of the claimed invention.

The direct channel uses time division of service flows of subscriber stations. The time in the forward channel is divided into frames, each of which in turn is divided into sixteen time slots. For each time slot, the transmission scheduling algorithm selects one subscriber station for data transmission. When transmitting data for each subscriber station, the entire sector power is used, i.e. there is no power adjustment in the forward channel. The reverse channel uses code division service flows of subscriber stations. Each subscriber station in the reverse channel is assigned a code channel from a limited set. Time in the return channel is also conditionally divided into frames, each of which in turn is divided into sixteen time slots. The frame duration is 26.67 ms. The reverse channel provides dynamic power control. The cdma2000 1xEV-DO standard supports adaptive coding and modulation in both forward and reverse channels. In the forward channel, the transmission rate can adaptively vary from slot to slot, in the reverse channel, from frame to frame. In the return channel, data can be transmitted at five speeds corresponding to various coding and modulation schemes. In the forward channel, data can be transmitted at nine speeds corresponding to various coding and modulation schemes.

In wireless networks, an important task is the handover of subscriber stations between sectors of the wireless network (see Stephen S. Rappaport and Cezary Purzynski, "Prioritized Resource Assignment for Mobile Cellular Communication Systems with Mixed Services and Platform Types", IEEE Trans. Veh. TechnoL, Vol .45, No.3, August, 1996 [6]). An effective solution to this problem in most cases requires taking into account a number of factors, such as signal strength for different sectors of the wireless network, load balancing between sectors of the wireless network, quality of service requirements of subscriber stations (see K. Pahlavan et al., "Handoff in Hybrid Mobile Data Networks, "IEEE Personal Communications, April 2000 [7]).

The task of handing off subscriber stations between sectors of a hybrid wireless network, including wireless networks of various standards, is close to the task of handing off subscriber stations between sectors of a wireless network operating according to one standard.

Qing-An Zeng and Dharma P. Agrawal, "Handoff in Wireless Mobile Networks," Handbook of Wireless Networks and Mobile Computing, Edited by Ivan Stojmenovic, Wiley, 2002, pp.2-3 [8] describes the main approaches to solving the problem handover of subscriber stations between sectors of a wireless network operating according to one standard. They are as follows:

- To service a subscriber station, a new sector is periodically selected if its signal level at the subscriber station is higher than the signal level of the current sector.

- To service a subscriber station, a new sector is periodically selected if its signal level at the subscriber station is higher than the signal level of the current sector and the signal level of the current sector is less than a predetermined threshold.

- For servicing a subscriber station, a new sector is periodically selected if its signal level at the subscriber station is higher than the signal level of the current sector by a predetermined amount.

- For servicing a subscriber station, a new sector is periodically selected if its signal level at the subscriber station is higher than the signal level of the current sector by a specified amount, and the signal level of the current sector is less than a predetermined threshold.

At the same time, the task of handing over subscriber stations between sectors of a hybrid wireless network, including wireless networks of various standards, has a number of features, the main of which is that it is not possible to directly compare signal levels of sectors of wireless networks operating on the basis of various standards. One way to account for this feature is to prioritize each of the networks that make up the hybrid network.

The closest in technical essence the solution to the claimed method is a method of transferring service to a subscriber station between an IEEE 802.11b wireless network and a GPRS wireless network described in YE Minhua, LIU Yu, ZHANG Hui-min, THE MOBILE IP HANDOFF BETWEEN HYBRID NETWORKS , PIMRC 2002 [9].

The prototype method, in which:

use at least one access point according to the IEEE 802.11b standard, at least one base station according to the GPRS standard and at least one mobile station having the ability to work both in the network according to IEEE 802.11b and in the network according to GPRS standard,

when servicing a mobile station, a wireless data network according to IEEE 802.11b is defined as a priority network, and a wireless data network according to GPRS is defined as a non-priority network,

the priority network service area formed by at least one access point is located inside the non-priority network service area formed by at least one base station,

the mobile station has at least one connection in the forward or reverse channel,

the entry threshold and the delay in entering the priority network are set,

the exit threshold and delayed exit from the priority network are set,

is as follows:

periodically assess the signal strength of the access point at the mobile station,

if the mobile station is served by an access point and current estimates of the signal level of the access point below the exit threshold for a time interval equal to the exit delay, then the mobile station is transferred from the priority network to the non-priority network,

if the mobile station is served by the base station and current estimates of the signal strength of the access point are above the entry threshold for a time interval equal to the entry delay, then the mobile station is transferred from the non-priority network to the priority network.

The prototype method has two significant disadvantages.

The prototype method does not meet the requirements for quality of service when transferring service to a subscriber station between a wireless network according to IEEE 802.11b and a wireless network according to GPRS. The quality of service of a subscriber station in the network according to the IEEE 802.11b standard is determined by the signal-to-noise ratio at the receiving side and the current load on the network. In the prototype method, these factors are not taken into account.

The prototype method does not take into account the load distribution between sectors of the hybrid wireless network. In the case of significant asymmetry of the load on the sectors of the hybrid wireless network, efficient handover of subscriber stations between sectors of the hybrid wireless network will significantly increase the maximum throughput of the hybrid wireless network and reduce the likelihood of congestion of its constituent sectors.

The problem to which the claimed method is directed is to increase the efficiency of the hybrid wireless network according to IEEE 802.16е OFDMA, IEEE 802.11b and cdma2000 1xEV-DO standards when transferring service to subscriber stations between sectors of the hybrid wireless network, while ensuring quality of service requirements for all service flows of all subscriber stations of a hybrid wireless network.

The solution to this problem is achieved by the claimed method of handover of subscriber stations in a hybrid wireless network according to IEEE 802.16е OFDMA, IEEE 802.11b and cdma2000 1xEV-DO standards, in which the hybrid wireless network includes urban network sectors according to IEEE 802.16e OFDMA standard, local network sectors according to the IEEE 802.11b standard and the cdma2000 1xEV-DO standard cellular network sector, the hybrid wireless network includes K sectors, where K is greater than or equal to two, and at least one subscriber station, each sector and each subscriber station have restrictions to the maximum transmission power, each subscriber station has one or more service flows in the forward channel, or one or more service flows in the return channel, or one or more service flows in the forward channel and one or more service flows in the return channel, to each service the stream is set a set of requirements for the quality of service, in the sectors of the city network use time duplex, multiple access with time-frequency division and frame structure with frequency diversity, the frame includes forward channel address and reverse channel frame, the boundary between the forward and reverse channel frames adaptively changing from frame to frame; during transmission, each service stream is assigned a type of coding and modulation and a value of transmission power, while the types of coding and modulation are numbered in order of increasing transmission speed starting from one and ending with the number Q, in the sectors of the local network during transmission of each subscriber station, transmission parameters are assigned, including the transmission speed, the size of the data block fragment and transfer mechanism, in the sectors of the cellular network when transmitting in the forward channel, each service stream is assigned the transmission speed and maximum transmission power, when transmitting in the return channel of each subscriber station, the transmission rate is assigned, when transmitting in the return channel, each service stream is assigned the transmission power, the maximum allowable values for exceeding the level of interference over thermal noise for the forward and reverse channels, which consists in the fact that they select periodically, once in a time interval T, a new set serving sectors for all subscriber stations in such a way that they select for each subscriber station a set of allowed sectors in which the quality of service requirements for all service flows of this subscriber station are satisfied, so that for each sector of the city network the load value of this subscriber is determined stations per sector as the value of the load on this sector created when serving only this subscriber station in it, using the load values in the forward and reverse channels For this sector, created when serving only this subscriber station in it, for an arbitrary position of the boundary between the frames of the forward and reverse channels, the optimal position when serving only this subscriber station in this sector, the position of the border between the frames of the forward and reverse channels, is determined for each sector the value of the minimum fraction of the maximum power of this subscriber station consumed during servicing in this sector of only this subscriber station is included in the set of allowed sectors each a torus for which the load value of this subscriber station per sector is less than or equal to one, and the value of the minimum fraction of the maximum power of this subscriber station consumed when serving only this subscriber station in this sector is less than or equal to one, for each local network sector is determined sector, the value of the load of this subscriber station on the sector as the value of the load on this sector, created when serving only this subscriber station in it, using the requirements for the quality of service For each service flow of this subscriber station, the value of the maximum throughput of the sector when serving only that subscriber station in it, select the optimal transmission parameters for each subscriber station for each sector, check for each sector the quality of service requirements for each service flow of this subscriber station for the selected optimal transmission parameters, each sector for which the load value of this subscriber station is included in the set of allowed sectors and the sector is less than or equal to unity, and the quality of service requirements are met for each service flow of this subscriber station for the selected optimal transmission parameters, for the sectors of the cellular network, the load value of this subscriber station per sector is determined for each sector using the quality of service requirements for each service flow of the direct channel of this subscriber station, reception conditions in the direct channel of this sector for this subscriber station, a limitation on the maximum transmit power of this subscriber torus, the number of code channels available for transmission in the return channel of this sector, determine for each sector the value of the minimum share of resources of this subscriber station consumed during servicing in this sector, using the quality of service requirements for each service flow of the return channel of this subscriber station, conditions reception in the reverse channel of this sector for this subscriber station, a limitation on the maximum transmit power of this subscriber station is included in the set of allowed sectors each a ctor for which the load of this subscriber station in this sector is less than or equal to one, and the minimum share of resources of this subscriber station consumed during servicing in this sector is less than or equal to one, and the minimum transmit power necessary to satisfy the requirements for service quality for each service flow of the direct channel of this subscriber station, does not exceed the limit on the maximum transmit power of this sector, form the initial set of serving sectors, including for each subscriber station, the sector with the smallest among its allowed sectors the load value of this subscriber station per sector, in (K-1) steps a new set of serving sectors is selected so as to minimize the maximum load on the sector in each subset of the set of all sectors of the wireless network, provided that a new serving sector for each subscriber station is selected from its set of allowed sectors, while the load value on the urban network sector is determined using direct load values ohm and the return channels of this sector for an arbitrary position of the boundary between frames of the forward and reverse channels, the optimal position of the boundary between frames of the forward and reverse channels, the load on the local network sector is determined using the quality of service requirements for each service flow in this sector, the maximum throughput value the capabilities of this sector, the value of the load on the cellular network sector is determined using the quality of service requirements for each service flow in this sector, the conditions direct and reverse channels for each subscriber station in this sector, restrictions on the maximum transmit power of this sector and each subscriber station, the values of the excess interference level over thermal noise in the forward and reverse channels of this sector, the maximum allowable values for the excess interference level over thermal noise for the forward and reverse channels, the number of subscriber stations in this sector, the number of code channels available for transmission in the reverse channel of this sector, at the first stage select the first intermediate set of serving sectors, using the initial set of serving sectors, so as to minimize the maximum sector load in the set of all K sectors, if K> 2, then include the sector with the maximum sector load in the new set of serving sectors as a serving sector for all subscriber stations that he serves exclude from further consideration this sector and all subscriber stations that he serves, otherwise include each of the two sectors of the selected intermediate set into a new set of service sectors as service sectors for all subscriber stations that they serve, if K> 3, then at the intermediate k-th stage, where k varies from two to (K-2), choose the k-th intermediate a set of serving sectors, using the (k-1) th intermediate set of serving sectors, so as to minimize the maximum load on a sector in a set of [K-k + 1) sectors, including all sectors except those excluded from the previous from the first to (k- 1st) stages include the sector with the maximum load value per sector to a new set of serving sectors as a serving sector for all subscriber stations that it serves exclude from further consideration this sector and all subscriber stations that it serves, if K> 2, then at the last (k-1) stage select the (K-1) -th intermediate set of serving sectors, using the (K-2) -th intermediate set of serving sectors, so as to minimize the maximum load on the sector in the set of two sectors, including all sectors except those excluded from the previous ones from the first about the (K-2) -th stages, include each of the two sectors of the selected intermediate set in a new set of serving sectors as serving sectors for all subscriber stations that they serve, transfer the service of the subscriber station from the current serving sector to the new serving sector for each subscriber station for which the new serving sector does not coincide with the current serving sector.

In this case, the time interval T is selected, using the rate of change of conditions affecting the value of the maximum load on the sector in the sectors of the hybrid wireless network, the overhead required to minimize the maximum load on the sector in the sectors of the hybrid wireless network and during the transfer of subscriber stations in the wireless network.

The value of the minimum fraction of the maximum power of a subscriber station consumed during servicing only this subscriber station in the urban network sector is determined using the average size of service flow data blocks transmitted in each frame for each service flow of the reverse channel of this subscriber station, types of coding and modulations and transmission power values selected for each service flow of the return channel of this subscriber station when determining the load value of this subscriber station stations to this sector, the optimal position of the boundary between the frames of the forward and reverse channels, selected when determining the load value of this subscriber station in this sector, the maximum value of the transmission power of this subscriber station.

Compliance with the quality of service requirements for each service flow of a subscriber station, when servicing in a local network sector, for optimal transmission parameters is checked using the transmission parameters optimal for this sector for this subscriber station, quality of service requirements for each service flow of this subscriber station, conditions reception in the forward and reverse channels of this sector for this subscriber station, the number of active subscriber stations in this sector.

The first intermediate set of serving sectors is selected so that all sectors from the initial set of serving sectors are included in the first intermediate set of serving sectors, the sector load value is determined for each sector of the first intermediate set, the sector with the maximum sector load value is selected from the first intermediate set, choose the next subscriber station in this sector with the maximum value of the load of the subscriber station in this sector, choose for this subscriber station The companies from its set of allowed sectors, the next sector with the minimum load of this subscriber station on a sector that does not match its current serving sector, determine the load on the sector for the sector selected for this subscriber station and for its current serving sector, provided it is served in the selected for this subscriber station sector, if each of these two values is less than the load on the sector for the current serving sector of this subscriber station, provided that it is serviced Ivanov therein, that include selected for this subscriber station sector in a first intermediate set as its serving sector is selected from a first set of the intermediate sector with a maximum load per sector.

The k-th intermediate set of serving sectors is selected so that all sectors from the (k-1) -th intermediate set of serving sectors are included in the k-th intermediate set of serving sectors, the sector load value is determined for each sector of the k-th intermediate set, choose from the k-th intermediate set a sector with a maximum value of the load on the sector, select the next subscriber station in this sector with a maximum value of the load of the subscriber station on this sector, choose for this subscriber station and from its set of allowed sectors, the next sector with the minimum value of the load of this subscriber station on the sector included in the k-th intermediate set of serving sectors and not coinciding with its current serving sector, determine the load on the sector for the selected sector for this subscriber station and for its the current serving sector, provided it is served in the sector selected for this subscriber station, if each of these two values is less than the sector load for the current serving Ktorov this subscriber station provided its maintenance therein, that include selected for this subscriber station sector k-th intermediate set as its serving sector selected from the k-th set of the intermediate sector with a maximum load per sector.

The (K-1) -th intermediate set of serving sectors is chosen so that all sectors from the (K-2) -th intermediate set of serving sectors are included in the (K-1) -th intermediate set of serving sectors, are determined for each sector (K -1) of the intermediate set, the value of the load on the sector, choose from the (K-1) -th intermediate set the sector with the maximum value of the load on the sector, select the next subscriber station in this sector with the maximum value of the load of the subscriber station on this sector, choose for this subscriber From its set of allowed sectors, the next sector with the minimum load of this subscriber station per sector included in the (K-1) -th intermediate set of serving sectors and not matching its current serving sector determines the load on the sector for the selected subscriber station of the sector and for its current serving sector, provided that it is served in the sector selected for this subscriber station, if each of these two values is less than the value of the sector load for current service If the operating sector of this subscriber station is subject to its service in it, then the sector selected for this subscriber station is included in the (K-1) th intermediate set as its serving sector, the sector with the maximum sector load value.

The load value on the cellular network sector is determined in such a way that the value of the excess of the level of interference over thermal noise in the forward channel of this sector is measured, the value of the excess of the level of interference over thermal noise in the reverse channel of this sector is measured using the quality of service requirements for each service flow of this sector , reception conditions in the forward and reverse channels for each subscriber station in this sector, restriction on the maximum transmission power of this sector, restrictions on the maximum power of each ab the subscriber station of this sector, the values of the excess of the level of interference over thermal noise in the forward and reverse channels of this sector, the maximum allowable values of the excess of the level of interference over thermal noise for the forward and reverse channels, the number of subscriber stations in this sector, the number of code channels available for transmission in return channel of this sector, determine the value of the load on the sector.

The load value on the local network sector is determined in such a way that for each subscriber station in this sector, the conditional value of the maximum capacity of this sector is determined, provided that the other subscriber stations in this sector are in the same reception conditions, the value of the maximum capacity of this sector is determined as the average arithmetic of the conditional values of the maximum throughput of this sector for each subscriber station in this sector, determine the minimum usknuyu sector capacity needed to meet the requirements on quality of service for all service flows of the sector, determine the value of the load on the sector as a ratio of the minimum required bandwidth sector to the maximum capacity of the sector.

The load value on the urban network sector is determined in such a way that the load value in the forward channel of the sector is determined for the average position of the boundary between the frames of the forward and reverse channels, the load value in the reverse channel of the sector is determined for the average position of the border between the frames of the forward and reverse channels, the optimal position is determined the boundary between the frames of the forward and reverse channels, using the load value in the forward channel of the sector for the average position of the boundary between the frames of the forward and reverse channels , the value of the load in the reverse channel of the sector for the average position of the border between the frames of the forward and reverse channels, the duration of the frame, using the optimal position of the border between the frames of the forward and reverse channels, the value of the load in the forward channel of the sector for the average position of the border between the frames of the forward and reverse channels, value load in the reverse channel of the sector for the average position of the border between the frames of the forward and reverse channels, the duration of the frame, determine the value of the load on the sector.

The value of the load in the forward channel of the urban network sector for a given position of the boundary between the frames of the forward and reverse channels is determined in such a way that they determine for each subscriber station in this sector the value of the minimum fraction of the resource of the forward channel frame consumed only by this subscriber station, so that the next the direct channel service stream of this subscriber station with the maximum average size of service stream data blocks transmitted in each frame is selected for this service flow type of coding and modulation and the value of the transmit power in such a way as to minimize the fraction of the resource of the direct channel frame consumed by this service stream in conjunction with all service flows of the direct channel of this subscriber station, for which the type of coding and modulation and the value of the transmit power are already selected, choose the minimum value of the transmission power of this service stream as the value of the transmission power, at which its set of requirements for the quality of service is fulfilled, the forward channel frame rate consumed by this service stream together with all the direct channel service flows of this subscriber station, for which the coding and modulation type and transmission power value are already selected, using the share of the direct channel frame resource consumed jointly by all the direct channel service flows of this subscriber station for which the type of coding and modulation and the value of the transmit power have already been selected, the average size of the service stream data blocks transmitted in each frame, the type of coding and dilation and the value of the transmission power selected for this service flow, the specified position of the boundary between the frames of the forward and reverse channels, the number of frequency subchannels in the frame of the forward channel, the maximum value of the transmission power of this sector, is taken as the value of the minimum share of the resource of the forward channel frame consumed only this subscriber station, the share of the resource frame direct channel consumed jointly by all the service flows of the direct channel of this subscriber station, determine the value of the load in direct m sector channel for a given position of the boundary between the frames of the forward and reverse channels in such a way that they select the next subscriber station in this sector with a minimum value of the minimum share of the resource of the forward channel frame consumed only by this subscriber station, select the next service flow of the direct channel of this subscriber station with the maximum the average size of the service stream data blocks transmitted in each frame, select the coding and modulation type and the power value n for this service stream broadcasts in such a way as to minimize the fraction of the resource of the direct channel frame consumed by this service stream together with all direct channel service streams of all subscriber stations in this sector, for which the type of coding and modulation and the transmission power value are already selected, while the transmission power is selected as the value the minimum value of the transmit power of this service stream, at which its set of requirements for the quality of service is fulfilled, determines the share of the resource of the direct channel frame consumed by m service flow together with all service flows of the direct channel of all subscriber stations in this sector, for which the type of coding and modulation and the value of the transmit power are already selected using the fraction of the resource of the frame of the direct channel consumed jointly by all service flows of the direct channel of all subscriber stations in this sector, for which coding and modulation type and transmission power value have already been selected, the average size of service stream data blocks transmitted in each frame, the coding and modulation type and the transmission power selected for this service stream, the specified position of the boundary between the frames of the forward and reverse channels, the number of frequency subchannels in the frame of the forward channel, the maximum value of the transmission power of this sector, is taken as the load value in the forward channel of the sector for a given position of the boundary between frames forward and reverse channels, the share of the forward channel frame resource consumed jointly by all the direct channel service flows of all subscriber stations in this sector.

The value of the load in the reverse channel of the urban network sector for a given position of the boundary between the frames of the forward and reverse channels is determined in such a way that for all service flows of the reverse channel of this sector, the coding and modulation type is chosen under the number Q, for each service flow of the reverse channel of this sector is selected in as the value of the transmit power, the minimum value of the transmit power at which a set of requirements for the quality of service of this service flow is satisfied is determined for each subscriber station of this sector, the value of the minimum fraction of the resource of the reverse channel frame consumed only by this subscriber station, so that for each service flow of the reverse channel of this subscriber station, the average fraction of the maximum power of this subscriber station consumed by this service flow is determined using the average size data blocks of this service stream transmitted in each frame, the type of coding and modulation and the value of the transmission power selected for this service stream is specified the position of the boundary between the frames of the forward and reverse channels, the maximum value of the transmit power of this subscriber station, if the sum of the average fraction of the maximum power of this subscriber station consumed by each service flow of the return channel of this subscriber station exceeds one, that is, at least one service the reverse channel flow of this subscriber station, for which the selected coding and modulation type number is greater than one, select the reverse channel service flow of this subscriber station stations with a maximum average fraction of the maximum power of this subscriber station consumed by the service stream for which the selected coding and modulation type number is greater than one is reduced by one the coding and modulation type number selected for this service stream is selected for this service stream as transmission power, the minimum value of transmission power at which a set of requirements for the quality of service of this service flow is fulfilled is determined for each service flow channel of this subscriber station, the value of the average fraction of the maximum power of this subscriber station consumed by this service flow determines the value of the minimum fraction of the resource of the reverse channel frame consumed only by this subscriber station using the average size of service stream data blocks transmitted in each frame for each the reverse channel service flow of this subscriber station, the type of coding and modulation and the transmit power value selected for each reverse channel service flow and for this subscriber station, the specified position of the boundary between the frames of the forward and reverse channels, the number of frequency subchannels in the frame of the reverse channel, is taken as the load value in the reverse channel of the sector for the specified position of the boundary between the frames of the forward and reverse channels, the sum of the values of the minimum share of the resource of the reverse channel frame consumed by each subscriber station in this sector.

The minimum value of the transmit power of the service flow of the direct channel of the urban network sector is determined in such a way that every Ω1 frames, where Ω1 is greater than or equal to one, for the subscriber station to which this service flow belongs, the reception conditions in the direct channel of this sector are measured, the measured reception conditions from the subscriber station to the serving sector, using the transmitted measured reception conditions and the corresponding transmit power values, predict the reception conditions in the current frame of the forward channel of this sectors, using the forecast of reception conditions, the set of requirements for the quality of service of this service stream, the type of coding and modulation assigned to this service stream, the average size of the data blocks of this service stream transmitted in each frame, determine the minimum transmit power of this service stream, at which fulfills its set of requirements for quality of service.

The minimum value of the transmit power of the service flow of the reverse channel of the urban network sector is determined in such a way that every Ω2 frames, where Ω2 is greater than or equal to one, for the subscriber station to which this service flow belongs, the reception conditions in the reverse channel of this sector are measured using the measured reception conditions and the corresponding transmission power values predict the reception conditions in the current frame of the reverse channel of this sector, using the forecast of the reception conditions, a set of requirements for the quality of service of this ervisnogo flow type coding and modulation assigned to that service flow, average size of the data blocks of the service flow transmitted in each frame, determining a minimum transmission power value of the service flow, wherein it is performed a set of requirements for quality of service.

The inventive method of handover of subscriber stations in a hybrid wireless network according to the IEEE 802.16e OFDMA, IEEE 802.11b and cdma2000 1xEV-DO standards has differences from the known technical solutions, which together allow to increase the efficiency of the hybrid wireless network when transferring service of subscriber stations between its sectors while providing quality service requirements for all service flows. These differences are as follows.

In the inventive method, for each subscriber station, a set of allowed sectors is selected in which the quality of service requirements for all service flows of this subscriber station are satisfied. The selection is as follows.

The set of permitted sectors of the subscriber station is selected in such a way that for each sector of the city network, the load value of this subscriber station per sector is determined for each sector as the value of the load on this sector created when it serves only this subscriber station using the load values in the forward and reverse channels of this sector, created when serving only this subscriber station in it, for an arbitrary position of the boundary between the frames of the forward and reverse channels, optimal, when served and in this sector of only this subscriber station, the position of the boundary between the frames of the forward and reverse channels, determine for each sector the value of the minimum fraction of the maximum power of this subscriber station consumed during maintenance in this sector of only this subscriber station, include each sector in the set of allowed sectors for which the value of the load of this subscriber station in the sector is less than or equal to unity, and the value of the minimum fraction of the maximum power of this subscriber station consumed at service in this sector of only this subscriber station, less than or equal to one, for sectors of the local network, for each sector, determine the load of this subscriber station per sector as the value of the load on this sector created when serving only this subscriber station in it, using quality requirements service for each service flow of this subscriber station, the value of the maximum throughput of the sector when serving only this subscriber station in it, is selected for each sector optimal transmission parameters for this subscriber station, check for each sector that the quality of service requirements for each service flow of this subscriber station are met for the selected optimal transmission parameters, include each sector in the set of allowed sectors for which the load on this subscriber station is less than or equal to the sector unit, and the requirements for the quality of service for each service flow of this subscriber station are fulfilled for the selected optimal transmission parameters, for sects The network network entors determine for each sector the value of the load of this subscriber station on the sector, using the quality of service requirements for each service flow of the direct channel of this subscriber station, the reception conditions in the direct channel of this sector for this subscriber station, the restriction on the maximum transmit power of this sector, the number of code channels available for transmission in the reverse channel of this sector, determine for each sector the value of the minimum share of resources of this subscriber station, we consume when servicing in this sector, using the quality of service requirements for each service flow of the return channel of this subscriber station, the reception conditions in the return channel of this sector for this subscriber station, the restriction on the maximum transmit power of this subscriber station, include each sector in the set of allowed sectors for which the value of the load of this subscriber station in this sector is less than or equal to one, and the value of the minimum fraction of the resources of this subscriber station consumed during servicing and in this sector, it is less than or equal to one, and the minimum transmission power necessary to satisfy the quality of service requirements for each service flow of the direct channel of this subscriber station does not exceed the limit on the maximum transmission power of this sector.

The prototype method does not take into account the requirements for quality of service. Thus, the prototype method does not meet the requirements for quality of service. The procedure proposed in the inventive method for selecting for each subscriber station a set of allowed sectors makes it possible to meet the quality of service requirements for all service flows.

In the claimed method, a new set of serving sectors is selected for all subscriber stations so as to minimize the maximum load on the sector in each subset of the set of all sectors. The selection is as follows.

In (K-1) stages, a new set of serving sectors is selected so as to minimize the maximum load on the sector in each subset of the set of all sectors of the wireless network, provided that the new serving sector for each subscriber station is selected from its set of allowed sectors, with the value the load on the urban network sector is determined using the load values in the forward and reverse channels of this sector for an arbitrary position of the boundary between frames of the forward and reverse channels, the optimal position faces between frames of the forward and reverse channels, the load on the local network sector is determined using the requirements for the quality of service for each service flow of this sector, the maximum throughput of this sector, the load on the cellular network sector is determined using the requirements for the quality of service for each service flow of this sector, reception conditions in the forward and reverse channels for each subscriber station in this sector, restrictions on the maximum transmission power of this sector of each of its subscriber stations, the values of the excess of the level of interference over thermal noise in the forward and reverse channels of this sector, the maximum allowable values of the excess of the level of interference over thermal noise for direct and reverse channels, the number of subscriber stations in this sector, the number of code channels available for transmission the return channel of this sector, at the first stage, the first intermediate set of serving sectors is selected using the initial set of serving sectors, so as to minimize the maximum load ku per sector in the set of all K sectors, if K> 2, then include the sector with the maximum load on the sector in a new set of serving sectors as a serving sector for all subscriber stations that it serves, exclude this sector and all the subscriber stations that he serves, otherwise include each of the two sectors of the selected intermediate set in a new set of serving sectors as serving sectors for all subscriber stations that they serve, e If K> 3, then at the intermediate k-th stage, where k varies from two to (K-2), the k-th intermediate set of serving sectors is selected using the (k-1) -th intermediate set of serving sectors, so that minimize the maximum load on the sector in the set of (K-k + 1) sectors, including all sectors except those excluded in the previous from the first to (k-1) -th stages, include the sector with the maximum load on the sector in a new set of serving sectors as a serving sector for all subscriber stations that it serves, lawsuit This sector and all subscriber stations that it serves are removed from further consideration, if K> 2, then at the last (K-1) th stage, the (K-1) th intermediate set of serving sectors is selected using (K-2) -th intermediate set of serving sectors, so as to minimize the maximum load on the sector in the set of two sectors, including all sectors except those excluded in the previous from the first to (K-2) -th stages, include each of the two sectors of the selected intermediate set in a new set of service sectors as a service sectors for all subscriber stations that they serve.

The prototype method does not take into account the load distribution between sectors of the hybrid wireless network. In the case of significant asymmetry of the load on the sectors of the hybrid wireless network, minimizing the maximum load on the sector in each subset of the set of all sectors will significantly increase the maximum throughput of the hybrid wireless network and reduce the likelihood of congestion in its sectors.

The description of the invention is illustrated by examples and drawings.

Figure 1 shows the logical structure of a frame with frequency diversity for the urban network sector.

Figure 2 illustrates the algorithm of the proposed method for handover of subscriber stations in a hybrid wireless network according to the IEEE 802.16e OFDMA, IEEE 802.11b and cdma2000 1xEV-DO standards.

Figure 3 shows the values of the load per sector for the initial set of serving sectors.

Figure 4 shows the values of the load per sector for the first intermediate set of serving sectors.

Figure 5 shows the values of the load per sector for the second intermediate set of serving sectors.

6 illustrates an algorithm for a procedure for selecting a first intermediate set of serving sectors.

7 illustrates an algorithm for determining for a subscriber station the minimum share of the frame resource of the forward channel sector of the urban network sector consumed only by this subscriber station.

Fig. 8 illustrates an algorithm for determining a load value in a forward channel of an urban network sector for an average boundary position between frames of the forward and reverse channels.

Fig. 9 illustrates an algorithm for determining, for each subscriber station in a sector, the value of a minimum fraction of the resource of a frame of a reverse channel of a city network consumed only by that subscriber station.

Figure 10 illustrates the dependence of the throughput of the hybrid wireless network on the proposed load on the hybrid wireless network.

11 illustrates the dependence of the maximum sector load in a hybrid wireless network on the proposed hybrid wireless network load.

Consider the operation of the proposed method of handover of subscriber stations in a hybrid wireless network according to the IEEE 802.16e OFDMA, IEEE 802.11b and cdma2000 1xEV-DO standards.

The inventive method is implemented in a control system of a hybrid wireless network. When this is used, for example, a workstation or server connected to a network that combines all sectors of the hybrid wireless network and hybrid wireless network management software.

Each hybrid wireless subscriber station has one or more service flows in the forward channel, or one or more service flows in the return channel, or one or more service flows in the forward channel and one or more service flows in the reverse channel.

Each service flow has a set of requirements for service quality.

Consider the IEEE 802.16e OFDMA urban network sector.

Service flow data blocks scheduled for transmission are converted to data packets before transmission. Using sets of requirements for the quality of service, the resource management algorithm assigns each type of data packet a type of coding and modulation, as well as a transmit power value.

Types of coding and modulation are numbered in order of increasing transmission speed, starting from one and ending with the number Q.

After a decision has been made for a certain service flow on the amount of data that will be transmitted in the frame, as well as on the type of coding and modulation that will be used, the size of the time-frequency resource that should be allocated to this service flow in this frame is known .

It is assumed that the urban network uses a frame structure with frequency diversity.

The logical structure of a frequency diversity frame is shown in FIG. The frame has a fixed duration and contains a forward channel frame and a reverse channel frame. The boundary between the frames of the forward and reverse channels can adaptively vary from frame to frame.

In the time domain, frames of the forward and reverse channels are divided into time slots, each of which contains one or more OFDM symbols. In the frequency domain, the subcarriers of the frames of the forward and reverse channels are divided into frequency subchannels, each of which contains several subcarriers. Before transmission, the subcarriers of one frequency subchannel are pseudo-randomly allocated over the entire frequency band of the OFDM signal.

We assume that the time-frequency resource of the frames of the forward and reverse channels is allocated by the service stream continuously from left to right from top to bottom.

Denote:

N is the number of subscriber stations in the sector,

- число сервисных потоков прямого канала i абонентской станции,

- the number of service flows of the direct channel i of the subscriber station,

- число сервисных потоков обратного канала i абонентской станции,

- the number of service flows of the reverse channel i of the subscriber station,

- среднее число информационных бит j сервисного потока прямого канала i абонентской станции, передаваемое в каждом кадре,

- the average number of information bits j of the service stream of the direct channel i of the subscriber station transmitted in each frame,

- среднее число информационных бит j сервисного потока обратного канала i абонентской станции, передаваемое в каждом кадре,

- the average number of information bits j of the service stream of the reverse channel i of the subscriber station transmitted in each frame,

- номер вида кодирования и модуляции, выбранный для j сервисного потока прямого канала i абонентской станции,

- the number of the type of coding and modulation selected for j service stream direct channel i of the subscriber station,

- номер вида кодирования и модуляции, выбранный для j сервисного потока обратного канала i абонентской станции,

- the number of the type of coding and modulation selected for j service stream of the reverse channel i of the subscriber station,

- число информационных бит j сервисного потока прямого канала i абонентской станции, передаваемое на одной поднесущей в одном OFDM символе, при использовании вида кодирования и модуляции под номером

,

- the number of information bits j of the service flow of the direct channel i of the subscriber station, transmitted on one subcarrier in one OFDM symbol, using the type of coding and modulation under the number

,

- число информационных бит j сервисного потока обратного канала i абонентской станции, передаваемое на одной поднесущей в одном OFDM символе, при использовании вида кодирования и модуляции под номером

,

- the number of information bits j of the service stream of the return channel i of the subscriber station transmitted on one subcarrier in one OFDM symbol, using the type of coding and modulation under the number

,

T is the total number of OFDM symbols in the frame,

T ^DL - the number of OFDM symbols in the frame of the forward channel, designed to transmit data blocks of service flows of the forward channel,

T ^UL = ^{TT DL} - the number of OFDM symbols in the frame of the reverse channel, designed to transmit data blocks of service flows of the reverse channel,

F ^DL - the number of subcarriers in the frame of the direct channel, designed to transmit data blocks of service flows of the direct channel,

F ^UL - the number of subcarriers in the frame of the reverse channel for transmitting data blocks of service flows of the reverse channel,

- максимальная мощность сектора, излучаемая в единицу времени (OFDM символ), доступная для передачи блоков данных сервисных потоков прямого канала,

- the maximum sector power emitted per unit time (OFDM symbol) available for transmitting data blocks of the service flows of the direct channel,

- значение мощности передачи на одну поднесущую на один OFDM символ, выбранное для j сервисного потока прямого канала i абонентской станции для вида кодирования и модуляции под номером

.

- the value of the transmit power per subcarrier per OFDM symbol selected for j service stream of the direct channel i of the subscriber station for the type of coding and modulation under the number

.

In the forward channel of a city network sector, the shared resources are the time-frequency resource of the forward channel frame and the sector power radiated per unit time (OFDM symbol). In this case, adaptation parameters during transmission are the types of coding and modulation and transmission power values selected for service flows during transmission in a forward channel frame.

The total volume of the time-frequency resource in the frame of the direct channel of the sector is determined by the formula

The share of the time-frequency resource of the forward channel frame consumed by the j service stream of the direct channel i of the subscriber station is determined by the formula

The share of the time-frequency resource of the direct channel frame consumed jointly by all service flows of the direct channel i of the subscriber station is determined by the formula

The share of the time-frequency resource of the direct channel frame consumed jointly by all service flows of the direct channel of all subscriber stations in the sector is determined by the formula

The normalized value s ^{DL of the} share of the time-frequency resource of the direct channel frame consumed jointly by all the service flows of the direct channel of all subscriber stations in the sector is a function of adaptation parameters and can be written as

We assume that when using a frame structure with frequency diversity, the value of the transmit power per subcarrier necessary to satisfy the same set of requirements for service quality is the same for all subcarriers of the frame.

The average fraction of the maximum sector power consumed by the j service stream of the direct channel i of the subscriber station is determined by the formula

The average share of the maximum sector power consumed jointly by all service flows of the direct channel i of the subscriber station is determined by the formula

The average share of the maximum sector power consumed jointly by all direct-channel service flows of all subscriber stations in the sector is determined by the formula

We will determine the fraction of the resource of the direct channel frame consumed jointly by all service flows of the direct channel of all subscriber stations in the sector, as

Denote:

q ^DL - a set of types of coding and modulation selected for all service flows of the direct channel of the sector,

p ^DL - a set of transmission power values selected for all service flows of the direct channel of the sector,

- значение мощности передачи, выбранное для j сервисного потока прямого канала i абонентской станции сектора,

- the transmit power value selected for j service stream direct channel i subscriber station sector,

- минимальное значение мощности передачи, позволяющее выполнить требования по качеству сервиса для j сервисного потока прямого канала i абонентской станции сектора.

- the minimum value of the transmission power, which allows fulfilling the requirements for the quality of service for j service stream of the direct channel i of the subscriber station of the sector.

We will determine the load in the forward channel of the sector u ^DL as a solution to the following conditional minimization problem.

To find

provided

those. when fulfilling the requirements for the quality of service for all service flows of the direct channel of all subscriber stations in the sector.

In the reverse channel of the urban network sector, the shared resource is the time-frequency resource of the reverse channel frame. The transmit power radiated per unit time (OFDM symbol) in the return channel is an individual resource of each subscriber station. In this case, adaptation parameters during transmission are the types of coding and modulation and transmission power values selected for service flows during transmission in the reverse channel frame.

The total volume of the time-frequency resource in the frame of the reverse channel of the sector is determined by the formula

The share of the time-frequency resource of the reverse channel frame consumed jointly by all service flows of the reverse channel of all subscriber stations in the sector is calculated similarly to that for the direct channel and is determined by the formula

The normalized value s ^UL of the resource share of the reverse channel frame consumed jointly by all service flows of the reverse channel of all subscriber stations in the sector is a function of adaptation parameters and can be written as

Denote:

q ^UL - a set of types of coding and modulation selected for all service flows of the reverse channel of the sector,

p ^UL is the set of transmission power values selected for all service flows of the reverse channel of the sector,

- значение мощности передачи, выбранное для j сервисного потока обратного канала i абонентской станции сектора,

- the transmit power value selected for j service stream of the reverse channel i subscriber station sector,

- минимальное значение мощности передачи, позволяющее выполнить требования по качеству сервиса для j сервисного потока обратного канала i абонентской станции сектора.

- the minimum value of the transmission power, which allows to fulfill the quality of service requirements for j service stream of the return channel i subscriber station sector.

We will determine the load in the reverse channel of the sector u ^UL as a solution to the following conditional minimization problem.

To find

provided

those. when fulfilling the requirements for the quality of service for all service flows of the reverse channel of all subscriber stations in the sector.

Shared sector resources include forward channel resources and reverse channel resources. Thus, the position of the boundary between the frames of the forward and reverse channels is an adaptation parameter when transmitting service flows of the sector.

Define the load on the sector as

где величины А и В не зависят от величины Т^DL=Т-Т^UL. При этом минимум функции max(u^UL(T^DL), u^DL(T^DL)) по переменной Т^DL достигается при соблюдении равенства

а оптимальное значение

определяется аналитическиThe functions u ^UL (T ^DL ) and u ^DL (T ^DL ) can be represented as

where the values of A and B are independent of the value of T ^DL = T-T ^UL . In this case, the minimum of the function max (u ^UL (T ^DL ), u ^DL (T ^DL )) with respect to the variable T ^{DL is} achieved subject to the equality

and the optimal value

determined analytically

Thus, the load on the sector is determined in four steps.

In the first step, for an arbitrary value of T ^DL , for example, T ^DL = T / 2, the values u ^UL (T ^DL ) and u ^DL (T ^DL ) are calculated.

In the second step, the optimal value is calculated

и нагрузка в прямом канале сектора

для оптимального значения

по формуламIn the third step, the load in the return channel of the sector and

and direct sector load

for optimal value

according to the formulas

In the last fourth step, the load on the sector is calculated by the formula

Consider the i subscriber station.

We define the load on the urban network sector created when serving only i subscriber stations in it, as

Where

The fulfillment of the inequality u _i > 1 for the sector means that all the resources of this sector are not enough to fulfill the quality of service requirements for all service flows i of the subscriber station when it is serviced in this sector.

We define the set of allowed sectors i of the subscriber station as a set of sectors in which the quality of service requirements for all service flows of this subscriber station are satisfied. Then the set of allowed sectors i of the subscriber station will include all sectors of the city network for which the inequality

u _i ≤1.

Consider the LAN sector according to the IEEE 802.11b standard.

The only shared resource of the LAN sector is the time that all service flows of the forward and reverse channels share.

We define the load on the sector as the minimum fraction of the time consumed by all service flows of the sector, provided that they meet the requirements for quality of service.

The quality of service when transmitting subscriber station service flows for given transmission parameters is determined by the reception conditions for this subscriber station and the number of active subscriber stations in the sector (see SAFilin et al., "Joint fragment size and transmission rate optimization for basic access mechanism of IEEE 802.11 b distributed coordination function, "European Conference on Wireless Technology (ECWT 2005), Oct. 2005 [10]; AV Garmonov et al." Joint fragment size and transmission rate optimization for request-to-send / clear-to-send mechanism of IEEE 802.11b distributed coordination function ", IEEE International Symposium on Personal, Indoor and Mobile Radio Communication (PIMRC 2005), Sep. 2005 [11]; AVGarmonov et al." Joint fragment size, transmission rate, and request-to-send / clear -to-send threshold optimization for IEEE 802.11b distributed coordination function, "IEEE Vehicular Technology Conference (VTC 2005 Spring), vol. 3, pp.2056-2060, May-Jun. 2005 [12]). Denote:

N is the number of subscriber stations in the sector,

- число сервисных потоков прямого канала i абонентской станции,

- the number of service flows of the direct channel i of the subscriber station,

- число сервисных потоков обратного канала i абонентской станции,

- the number of service flows of the reverse channel i of the subscriber station,

- минимальная скорость передачи j сервисного потока прямого канала i абонентской станции, при которой выполняются требования по качеству сервиса для этого сервисного потока,

- the minimum transmission rate j of the service flow of the direct channel i of the subscriber station, at which the quality of service requirements for this service flow are met,

- минимальная скорость передачи j сервисного потока обратного канала i абонентской станции, при которой выполняются требования по качеству сервиса для этого сервисного потока,

- the minimum transmission rate j of the service flow of the return channel i of the subscriber station, at which the quality of service requirements for this service flow are met,

Y is a set of transmission parameters, including the fragment size of the data block, transmission rate and transmission mechanism for each subscriber station in the sector,

W is the bandwidth of the sector.

We will determine the load on the sector and as a solution to the next problem of conditional optimization.

To find

when fulfilling the requirements for service quality for all service flows of all subscriber stations in the sector.

The capacity of a local network sector under given reception conditions for each subscriber station in the sector is determined by the number of active subscriber stations in the sector and transmission parameters selected for each subscriber station in this sector.

A simple quick scheme for choosing the optimal transmission parameters at which the maximum throughput of the sector is achieved is given, for example, in [10], [11] and [12] for the case when all subscriber stations in the sector are in the same reception conditions.

The maximum capacity of the sector for the general case can be calculated approximately, for example, as the arithmetic average of the values of the maximum capacity of the sector, calculated under the assumption that all subscriber stations in the sector are in the same reception conditions that match the reception conditions of one of the subscriber stations in this sector.

Consider the cellular network sector according to the cdma2000 1xEV-DO standard.

Denote:

N is the number of subscriber stations in the sector,

T _frame - _frame duration,

With _max - the number of code channels in the reverse channel sector,

- ограничение на максимальную мощность передачи сектора,

- restriction on the maximum transmit power of the sector,

g _i - transmission coefficient of channel i of the subscriber station of the sector,

- ограничение на максимальную мощность передачи i абонентской станции,

- restriction on the maximum transmit power i of the subscriber station,

- число сервисных потоков прямого канала i абонентской станции,

- the number of service flows of the direct channel i of the subscriber station,

- число сервисных потоков обратного канала i абонентской станции,

- the number of service flows of the reverse channel i of the subscriber station,

- среднее число информационных бит j сервисного потока прямого канала i абонентской станции, передаваемое в каждом кадре,

- the average number of information bits j of the service stream of the direct channel i of the subscriber station transmitted in each frame,

- среднее число информационных бит j сервисного потока обратного канала i абонентской станции, передаваемое в каждом кадре,

- the average number of information bits j of the service stream of the reverse channel i of the subscriber station transmitted in each frame,

- скорость передачи в прямом канале, выбранная для j сервисного потока i абонентской станции,

is the forward channel transmission rate selected for j service stream i of the subscriber station,

- скорость передачи в обратном канале, выбранная для i абонентской станции,

- the transmission rate in the reverse channel, selected for i subscriber station,

- минимальное значение мощности передачи, при котором выполняются требования по качеству сервиса для j сервисного потока прямого канала i абонентской станции для скорости передачи

,

- the minimum value of the transmission power at which the quality of service requirements are met for the j service stream of the direct channel i of the subscriber station for the transmission rate

,

- минимальное значение мощности передачи, при котором выполняются требования по качеству сервиса для j сервисного потока обратного канала i абонентской станции для скорости передачи

.

- the minimum value of the transmission power at which the quality of service requirements for j service stream of the reverse channel i subscriber station for the transmission speed

.

In the sector back channel, shared resources are a code resource and interference power.

Each subscriber station sector in the return channel is allocated one code channel.

As a simple measure of the level of interference, the value of the excess of the noise level over thermal noise (RoT - Rise over Thermal) is widely used, which is the ratio of the total received power to the thermal noise power.

Let us determine the excess of the noise level over thermal noise in the return channel of the sector as follows:

- средняя мощность помех, создаваемых всеми абонентскими станциями других секторов сотовой сети,

- мощность теплового шума в обратном канале,

- средняя за кадр излучаемая мощность i абонентской станцииWhere

- the average interference power generated by all subscriber stations in other sectors of the cellular network,

- power of thermal noise in the return channel,

- average per frame emitted power i of the subscriber station

- вклад в среднюю мощность мощности

служебных сообщений, занимающих τ^UL _p/T_frame долю кадра обратного канала.where τ ^UL _ij = b ^UL _ij / r ^UL _i is the time taken in the frame of the return channel j by the service stream i of the subscriber station,

- contribution to average power output

service messages occupying τ ^UL _p / T _{frame the} proportion of the reverse channel frame.

и

при превышении которых сотовая сеть становится перегруженной. Первое значение -

связано со стабильностью алгоритма регулировки мощности. Второе значение -

связано с уменьшением области покрытия сети при возрастании уровня помех. При достижении величины превышения уровня помех над тепловым шумом в обратном канале

не все абонентские станции сотовой сети могут быть обслужены, что означает перегрузку сети.There are two critical threshold values for the excess noise level over thermal noise in the return channel -

and

in excess of which the cellular network becomes congested. First value is

due to the stability of the power control algorithm. The second value is

It is associated with a decrease in the network coverage area with an increase in the level of interference. When the level of interference exceeds thermal noise in the return channel

not all subscriber stations of the cellular network can be served, which means network congestion.

We will determine the load in the reverse channel of the sector u ^UL as the minimum fraction of the code and interference resources consumed by all subscriber stations in the sector

subject to the conditions

those. when fulfilling the requirements for the quality of service for all service flows of the reverse channel of all subscriber stations in the sector.

может быть использовано текущее измеренное значение превышения уровня помех над тепловым шумом в обратном канале сектора.For an approximate calculation of the load in the return channel of the sector u ^UL as

the current measured value of the excess of the noise level over thermal noise in the reverse channel of the sector can be used.

In a forward channel of a sector, shared resources are time and interference power.

As a simple measure of the interference level in the forward channel, we also suggest using the excess of the noise level over thermal noise in the forward channel (RoT - Rise over Thermal), which is the average ratio of the total power received by the subscriber station to the thermal noise power for all subscriber stations in the sector in the direct channel. The average per frame total power received by the i subscriber station in the sector is

- средняя мощность помех от других секторов сотовой сети,

- мощность теплового шума в прямом канале.Where

- average interference power from other sectors of the cellular network,

- thermal noise power in the forward channel.

Let us determine the excess of the noise level over thermal noise in the forward channel of the sector as follows:

и

при превышении которых сотовая сеть становится перегруженной. Первое значение -

связано с потерей ортогональности сигналов в прямом канале. Второе значение -

связано с уменьшением области покрытия сети при возрастании уровня помех. При достижении величины превышения уровня помех над тепловым шумом в прямом канале

не все абонентские станции сотовой сети могут быть обслужены, что означает перегрузку сети.There are two critical threshold values for the excess noise level over thermal noise in the forward channel -

and

in excess of which the cellular network becomes congested. First value is

due to the loss of orthogonality of signals in the forward channel. The second value is

It is associated with a decrease in the network coverage area with an increase in the level of interference. When the level of interference exceeds thermal noise in the forward channel

not all subscriber stations of the cellular network can be served, which means network congestion.

We will determine the load in the forward channel of the sector u ^DL as the minimum share of the time and interference resources consumed by all subscriber stations in the sector

subject to the conditions

those. when fulfilling the requirements for the quality of service for all service flows of the direct channel of all subscriber stations in the sector.

For an approximate calculation of the load in the forward channel of the sector u ^DL , the current measured value of the excess of the noise level over thermal noise in the forward channel of the sector can be used as RoT ^DL .

Shared sector resources include forward channel resources and reverse channel resources. Define the load on the sector as

u = max (u ^DL , u ^UL ).

The load of the subscriber station on the sector will be defined as the load on the sector created by this subscriber station when it is serviced in this sector, provided there is no interference from other sectors and subscriber stations of the cellular network.

In this case, the load i of the subscriber station per sector can be written as

subject to the conditions

those. when fulfilling the quality of service requirements for all service flows of the direct channel of this subscriber station.

The resources of a subscriber station during servicing in the cellular network sector include the time and maximum transmission power of this subscriber station.

We will determine the minimum share of resources i of the subscriber station u _i ^SS consumed during servicing in the cellular network sector as

The inventive method of transmission service of subscriber stations in a hybrid wireless network according to the IEEE 802.16e-OFDMA, IEEE 802.11b and cdma2000 1xEV-DO standards solves the problem of transmission control in the following formulation.

To minimize the maximum load on the sector in each subset of the set of all sectors of the hybrid wireless network while satisfying the quality of service requirements for all service flows of all subscriber stations of the hybrid wireless network.

Denote:

K is the total number of sectors in a hybrid wireless network, K≥2,

K _S ⊆ {1, 2, ..., K} is an arbitrary subset of sectors of a hybrid wireless network,

- множество всех возможных подмножеств секторов гибридной беспроводной сети,

- the set of all possible subsets of the sectors of the hybrid wireless network,

Ξ _i ⊆ {1, 2, ..., K} - a set of allowed sectors i of the subscriber station,

M is the total number of subscriber stations in a hybrid wireless network, M≥1,

] - набор обслуживающих секторов для всех абонентских станций гибридной беспроводной сети, где ν_i - обслуживающий сектор для i абонентской станции,ν = [ν _i ∈ {1, 2, ..., K}, i =

] is the set of serving sectors for all subscriber stations of the hybrid wireless network, where ν _i is the serving sector for i subscriber stations,

u _k is the load on sector k.

The task of minimizing the maximum load on a sector in each subset of the set of all sectors of a hybrid wireless network is mathematically formulated as conditional minimization.

To find

subject to the selection of a serving sector for each subscriber station of the network only from its set of allowed sectors

those. when fulfilling the requirements for the quality of service of all service flows of the forward and reverse channels of a hybrid wireless network.

The inventive method of transmission service of subscriber stations in a hybrid wireless network according to IEEE 802.16e OFDMA, IEEE 802.11b and cdma2000 1xEV-DO standards includes two procedures (figure 2):

- the procedure for selecting a new set of serving sectors for all subscriber stations and

- the procedure for handing off a subscriber station from the current serving sector to a new serving sector for each subscriber station for which the new serving sector does not coincide with the current serving sector.

The second procedure is performed for each new set of serving sectors for all subscriber stations.

Consider the procedure for selecting a new set of serving sectors for all subscriber stations of a hybrid wireless network. It includes (K-1) stages, where K is the total number of sectors in a hybrid wireless network, and is performed as follows.

Periodically, once in a time interval T, a new set of serving sectors for all subscriber stations is selected in such a way that

- choose for each subscriber station a set of allowed sectors in which the quality of service requirements for all service flows of this subscriber station are satisfied, so that

for urban network sectors

- determine for each sector the value of the load of this subscriber station per sector as the value of the load on this sector created when serving only this subscriber station in it, using

- the load values in the forward and reverse channels of this sector, created when serving only this subscriber station in it, for an arbitrary position of the boundary between frames of the forward and reverse channels,

- the optimal, when serving in this sector only this subscriber station, the position of the border between the frames of the forward and reverse channels,

- determine for each sector the value of the minimum fraction of the maximum power of this subscriber station consumed during maintenance in this sector only of this subscriber station,

- include in the set of permitted sectors each sector for which

- the value of the load of this subscriber station in the sector is less than or equal to one, and

- the value of the minimum fraction of the maximum power of this subscriber station consumed when serving in this sector only this subscriber station is less than or equal to one,

for LAN sectors

- determine for each sector the value of the load of this subscriber station on the sector as the value of the load on this sector created when serving only this subscriber station in it, using

- requirements for the quality of service for each service flow of this subscriber station,

- the value of the maximum throughput of the sector when serving in it only this subscriber station,

- choose for each sector the optimal transmission parameters for this subscriber station,

- check for each sector the fulfillment of the requirements for the quality of service for each service flow of this subscriber station for the selected optimal transmission parameters,

- include in the set of permitted sectors each sector for which

- the value of the load of this subscriber station in the sector is less than or equal to one, and

- the quality of service requirements are met for each service flow of this subscriber station for the selected optimal transmission parameters,

for mobile network sectors

- determine for each sector the value of the load of this subscriber station per sector, using

- requirements for the quality of service for each service stream of the direct channel of this subscriber station,

- reception conditions in the direct channel of this sector for this subscriber station,

- a limit on the maximum transmit power of this sector,

- the number of code channels available for transmission in the reverse channel of this sector,

- determine for each sector the value of the minimum share of resources of this subscriber station consumed during servicing in this sector, using

- requirements for the quality of service for each service flow of the return channel of this subscriber station,

- reception conditions in the reverse channel of this sector for this subscriber station,

- a limit on the maximum transmit power of this subscriber station,

- include in the set of permitted sectors each sector for which

- the value of the load of this subscriber station in this sector is less than or equal to one, and

- the value of the minimum share of resources of this subscriber station consumed during servicing in this sector is less than or equal to one, and

- the minimum transmission power necessary to meet the quality of service requirements for each service stream of the direct channel of this subscriber station does not exceed the limit on the maximum transmission power of this sector,

- form the initial set of serving sectors, including in it for each subscriber station the sector with the smallest among its permitted sectors the load value of this subscriber station on the sector,

- select in (K-1) stages a new set of serving sectors so that

- minimize the maximum load on the sector in each subset of the set of all sectors of the wireless network, provided that,

- a new serving sector for each subscriber station is selected from its set of allowed sectors, while:

- the value of the load on the urban network sector is determined using

- load values in the forward and reverse channels of this sector for an arbitrary position of the boundary between the frames of the forward and reverse channels,

- the optimal position of the border between the frames of the forward and reverse channels,

- the value of the load on the LAN sector is determined using

- requirements for the quality of service for each service flow in this sector,

- the value of the maximum throughput of this sector,

- the value of the load on the cellular network sector is determined using

- requirements for the quality of service for each service flow in this sector,

- reception conditions in the forward and reverse channels for each subscriber station in this sector,

- restrictions on the maximum transmission power of this sector and each subscriber station,

- the values of the excess noise level over thermal noise in the forward and reverse channels of this sector,

- the maximum permissible values of the excess noise level over thermal noise for the forward and reverse channels,

- the number of subscriber stations in this sector,

- the number of code channels available for transmission in the reverse channel of this sector,

at the first stage

- choose the first intermediate set of serving sectors using

- an initial set of serving sectors, so that

- minimize the maximum load on the sector in the set of all K sectors,

- if K> 2, then

- include the sector with the maximum value of the load on the sector in a new set of serving sectors as a serving sector for all subscriber stations that it serves,

- exclude from further consideration this sector and all subscriber stations that it serves,

- otherwise, each of the two sectors of the selected intermediate set is included in a new set of serving sectors as serving sectors for all subscriber stations that they serve,

- if K> 3, then

- at the intermediate k-th stage, where k varies from two to (K-2),

- choose the k-th intermediate set of serving sectors using

- (k-1) -th intermediate set of serving sectors, so that

- minimize the maximum load on the sector in the set of (K-k + 1) sectors, including all sectors except those excluded at the previous stages from the first to (k-1) th,

- include the sector with the maximum load on the sector in a new set of serving sectors as a serving sector for all subscriber stations that it serves,

- exclude from further consideration this sector and all subscriber stations that it serves,

- if K> 2, then

- at the last (K-1) th stage, the (R-1) th intermediate set of serving sectors is selected,

using

(K-2) -th intermediate set of serving sectors, so that

- minimize the maximum load on the sector in the set of two sectors, including all sectors except those excluded in the previous from the first to (K-2) -th stages,

- include each of the two sectors of the selected intermediate set in a new set of serving sectors as serving sectors for all subscriber stations that they serve.

The time interval T is selected using

- the rate of change of conditions affecting the value of the maximum load on the sector in the sectors of the hybrid wireless network, and

- the overhead required to minimize the maximum load on the sector in the sectors of the hybrid wireless network and the transfer of service of subscriber stations in the hybrid wireless network.

We illustrate with an example the procedure for choosing a new set of serving sectors for all subscriber stations.

Consider a hybrid wireless network of three sectors (K = 3). The procedure for selecting a new set of serving sectors for all subscriber stations of this network includes two stages.

Figure 3 shows the values of the load per sector for all sectors of the network for the initial set of serving sectors. Figure 3 shows that the load on sector 1 of the initial set of serving sectors is greater than one, i.e. This sector is overloaded.

At the first stage, using the initial set of serving sectors, the first intermediate set of serving sectors is selected so as to minimize the maximum load on the sector in the set of all three sectors.

Figure 4 shows the values of the load per sector for all sectors of the network for the selected first intermediate set of serving sectors. Figure 4 shows that the load on sector 1 is the highest among all sectors of the first intermediate set.

Next, in the first stage, sector 1 is included in a new set of serving sectors as a serving sector for all subscriber stations for which it was included as a serving sector in the first intermediate set. After that, sector 1 and all subscriber stations that it serves are excluded from further consideration.

In the last second step, using the first intermediate set of serving sectors, a second intermediate set of serving sectors is selected so as to minimize the maximum load on the sector in the set of the two remaining sectors.

Figure 5 shows the values of the load per sector for all sectors of the network for the selected second intermediate set of serving sectors.

Further, in the last second stage, sector 2 and sector 3 are included in a new set of serving sectors as serving sectors for all subscriber stations for which they were included as serving sectors in the second intermediate set.

From figure 3 and figure 5 it is seen that after the transfer of service of subscriber stations from the current serving sectors to new for all subscriber stations for which the new serving sectors do not coincide with the current ones, the overload in sector 1 will be eliminated, and the load on sectors 2 and 3 will be balanced.

Let us explain the following operations of the procedure for selecting a new set of serving sectors for all subscriber stations of a wireless network:

- the operation of determining the value of the minimum fraction of the maximum power of the subscriber station consumed during maintenance in the urban network sector of only this subscriber station,

- the operation of verifying compliance with the quality of service requirements for each service flow of the subscriber station, when servicing in the local network sector, for optimal transmission parameters,

- the operation of selecting the first intermediate set of serving sectors,

- the operation of selecting the k-th intermediate set of serving sectors and

- the operation of selecting the (K-1) -th intermediate set of serving sectors.

The value of the minimum fraction of the maximum power of the subscriber station consumed during maintenance in the urban network sector of only this subscriber station is determined using

- values of the average size of the service flow data blocks transmitted in each frame for each service flow of the return channel of this subscriber station,

- types of coding and modulation and transmission power values selected for each service flow of the return channel of this subscriber station when determining the load value of this subscriber station in this sector,

- the optimal position of the boundary between the frames of the forward and reverse channels, selected when determining the load value of this subscriber station in this sector,

- the maximum value of the transmit power of this subscriber station.

Compliance with the quality of service requirements for each service flow of the subscriber station, when servicing in the local network sector, is checked for optimal transmission parameters using

- optimal transmission parameters for this sector for this subscriber station,

- requirements for the quality of service for each service flow of this subscriber station,

- reception conditions in the forward and reverse channels of this sector for this subscriber station,

- the number of active subscriber stations in this sector.

The first intermediate set of serving sectors is chosen so that

- include in the first intermediate set of service sectors all sectors from the initial set of service sectors,

- determine for each sector of the first intermediate set the value of the load on the sector,

- choose from the first intermediate set of sectors with the maximum value of the load on the sector,

- choose the next subscriber station in this sector with the maximum value of the load of the subscriber station in this sector,

- choose another sector for this subscriber station from its set of allowed sectors with a minimum load value of this subscriber station on a sector that does not match its current serving sector,

- determine the load on the sector for the selected sector for this subscriber station and for its current serving sector, provided it is served in the selected sector for this subscriber station,

- if each of these two values is less than the value of the load on the sector for the current serving sector of this subscriber station, provided it is serviced in it, then

- include the selected sector for this subscriber station in the first intermediate set as its serving sector,

- choose from the first intermediate set the sector with the maximum value of the load on the sector.

The algorithm for implementing the procedure for selecting the first intermediate set of serving sectors can conditionally be divided into five steps (Fig.6), each of which includes a certain sequence of actions of the method.

In the first step:

- include in the first intermediate set of service sectors all sectors from the initial set of service sectors,

- determine for each sector of the first intermediate set the value of the load on the sector.

After the first step, go to the second step.

In the second step:

- choose from the first intermediate set the sector with the maximum value of the load on the sector.

After the second step, condition A is checked:

- whether there is at least one subscriber station in this sector for which an operation has not yet been carried out to select from its set of permitted sectors of the sector that does not coincide with its current serving sector.

If there is at least one subscriber station in this sector for which an operation has not yet been performed to select from its set of allowed sectors of the sector that does not coincide with its current serving sector, then proceed to the third step.

If there is not a single subscriber station in this sector for which the operation of selecting from its set of permitted sectors of a sector that does not coincide with its current serving sector has been performed, the procedure for selecting the first intermediate set of serving sectors has been completed.

In the third step:

- choose the next subscriber station in this sector with the maximum value of the load of the subscriber station in this sector.

After the third step, condition B is checked:

- whether there is at least one sector from the set of allowed sectors of this subscriber station that does not coincide with its current serving sector, which has not yet been selected for this subscriber station. If there is at least one sector from the set of allowed sectors of this subscriber station that does not coincide with its current serving sector, which has not yet been selected for this subscriber station, then proceed to the fourth step.

If there is not one such sector left from the set of allowed sectors of this subscriber station that does not coincide with its current serving sector, which has not yet been selected for this subscriber station, then check condition A.

In the fourth step:

- choose another sector for this subscriber station from its set of allowed sectors with a minimum load value of this subscriber station on a sector that does not match its current serving sector,

- determine the load on the sector for the selected sector for this subscriber station and for its current serving sector, provided it is served in the selected sector for this subscriber station.

After the fourth step, condition B is checked:

- whether each of these two values is less than the load per sector for the current serving sector of this subscriber station, provided that it is served there. If each of these two values is less than the load on the sector for the current serving sector of this subscriber station, provided it is serviced in it, then go to the fifth step.

Otherwise, check condition B.

In the fifth step:

- include the sector selected for this subscriber station in the first intermediate set as its serving sector.

After the fifth step, go to the second step.

The kth intermediate set of serving sectors is chosen so that

- include in the k-th intermediate set of serving sectors all sectors from the (k-1) -th set of serving sectors,

- determine for each sector of the k-th intermediate set the value of the load on the sector,

- choose from the k-th intermediate set the sector with the maximum value of the load on the sector,

- choose the next subscriber station in this sector with the maximum value of the load of the subscriber station in this sector,

- choose another sector for this subscriber station from its set of allowed sectors with a minimum load value of this subscriber station on a sector included in the k-th intermediate set of serving sectors and not matching its current serving sector,

- determine the load on the sector for the selected sector for this subscriber station and for its current serving sector, provided it is served in the selected sector for this subscriber station,

- if each of these two values is less than the value of the load on the sector for the current serving sector of this subscriber station, provided it is serviced in it, then

- include the sector selected for this subscriber station in the k-th intermediate set as its serving sector,

- choose from the k-th intermediate set the sector with the maximum value of the load on the sector.

The algorithm for implementing the procedure for choosing the kth intermediate set of serving sectors is similar to the described algorithm for the first intermediate set.

The (K-1) th intermediate set of serving sectors is chosen so that

- include in the (K-1) -th intermediate set of serving sectors all sectors from the (K-2) -th set of serving sectors,

- determine for each sector (K-1) -th intermediate set the value of the load on the sector,

- choose from the (K-1) -th intermediate set sector with the maximum value of the load on the sector,

- choose the next subscriber station in this sector with the maximum value of the load of the subscriber station in this sector,

- choose another sector for this subscriber station from its set of allowed sectors with a minimum load value of this subscriber station on a sector included in the (K-1) -th intermediate set of serving sectors and not matching its current serving sector,

- determine the load on the sector for the selected sector for this subscriber station and for its current serving sector, provided it is served in the selected sector for this subscriber station,

- if each of these two values is less than the value of the load on the sector for the current serving sector of this subscriber station, provided it is serviced in it, then

- include the sector selected for this subscriber station in the (K-1) -th intermediate set as its serving sector,

- choose from the (K-1) -th intermediate set sector with the maximum value of the load on the sector.

The algorithm for implementing the procedure for selecting the (K-1) -th intermediate set of serving sectors is similar to the described algorithm for the first intermediate set.

Let us explain the operation of determining the value of the load on the cellular network sector.

The value of the load on the cellular network sector is determined in such a way that

- measure the value of the excess noise level over thermal noise in the direct channel of this sector,

- measure the value of the excess noise level over thermal noise in the return channel of this sector, using

- requirements for the quality of service for each service flow in this sector,

- reception conditions in the forward and reverse channels for each subscriber station in this sector,

- a limit on the maximum transmit power of this sector,

- restrictions on the maximum power of each subscriber station in this sector,

- the values of the excess noise level over thermal noise in the forward and reverse channels of this sector,

- the maximum permissible values of the excess noise level over thermal noise for the forward and reverse channels,

- the number of subscriber stations in this sector,

- the number of code channels available for transmission in the reverse channel of this sector,

- determine the value of the load on the sector.

Let us explain the operation of determining the value of the load on the local network sector.

The value of the load on the LAN sector is determined in such a way that

- for each subscriber station in this sector, the conditional value of the maximum capacity of this sector is determined, provided that the other subscriber stations in this sector are in the same reception conditions,

- determine the value of the maximum capacity of this sector as the arithmetic average of the conditional values of the maximum capacity of this sector for each subscriber station in this sector,

- determine the minimum capacity of the sector necessary to meet the requirements for quality of service for all service flows of this sector,

- determine the value of the load on this sector as the ratio of the minimum required bandwidth of the sector to the maximum bandwidth of this sector.

Let us explain the operation of determining the value of the load on the urban network sector.

The value of the load on the urban network sector is determined in such a way that

- determine the value of the load in the forward channel of the sector for the average position of the border between the frames of the forward and reverse channels,

- determine the value of the load in the reverse channel of the sector for the average position of the border between the frames of the forward and reverse channels,

- determine the optimal position of the boundary between the frames of the forward and reverse channels, using

- the value of the load in the forward channel of the sector for the average position of the border between the frames of the forward and reverse channels,

- the value of the load in the reverse channel of the sector for the average position of the boundary between the frames of the forward and reverse channels and

- frame duration using

- the optimal position of the border between the frames of the forward and reverse channels,

- the value of the load in the forward channel of the sector for the average position of the border between the frames of the forward and reverse channels,

- the value of the load in the reverse channel of the sector for the average position of the boundary between the frames of the forward and reverse channels and

- frame duration

- determine the value of the load on the sector.

Let us explain the operation of determining the load value in the forward channel of the urban network sector for a given position of the boundary between the frames of the forward and reverse channels.

The value of the load in the forward channel of the urban network sector for a given position of the boundary between the frames of the forward and reverse channels is determined in such a way that

- determine for each subscriber station in this sector the value of the minimum fraction of the resource of the direct channel frame consumed only by this subscriber station, so that

- choose the next service flow of the direct channel of this subscriber station with the maximum average size of the service flow data blocks transmitted in each frame,

- choose for this service stream the type of coding and modulation and the value of the transmit power so that

- minimize the resource share of the direct channel frame consumed by this service stream in conjunction with all the direct channel service streams of this subscriber station, for which the type of coding and modulation and the transmission power value are already selected, while

- choose as the value of the transmit power the minimum value of the transmit power of this service stream, at which its set of requirements for the quality of service is satisfied,

- determine the fraction of the resource of the direct channel frame consumed by this service stream in conjunction with all the service flows of the direct channel of this subscriber station, for which the type of coding and modulation and the transmission power value are already selected using

- the share of the resource of the direct channel frame consumed jointly by all the service flows of the direct channel of this subscriber station, for which the type of coding and modulation and the value of the transmit power have already been selected,

- the average size of the service flow data blocks transmitted in each frame,

- the type of coding and modulation and the value of the transmission power selected for this service stream,

- the specified position of the boundary between the frames of the forward and reverse channels,

- the number of frequency subchannels in the frame of the direct channel and

- the maximum value of the transmit power of this sector,

- take as the value of the minimum share of the resource of the direct channel frame consumed only by this subscriber station, the share of the resource of the direct channel frame consumed jointly by all the service flows of the direct channel of this subscriber station, determine the load value in the forward channel of the sector for a given position of the boundary between the frames of the direct and reverse channels in such a way that

- choose the next subscriber station of this sector with a minimum value of the minimum share of the resource of the frame of the direct channel consumed only by this subscriber station,

- choose the next service flow of the direct channel of this subscriber station with the maximum average size of the service flow data blocks transmitted in each frame,

- choose for this service stream the type of coding and modulation and the value of the transmit power so that

- minimize the resource share of the direct channel frame consumed by this service stream together with all direct channel service streams of all subscriber stations in this sector, for which the type of coding and modulation and the transmission power value have already been selected, while

- choose as the value of the transmit power the minimum value of the transmit power of this service stream, at which its set of requirements for service quality is fulfilled,

- determine the share of the direct channel frame resource consumed by this service stream together with all direct channel service streams of all subscriber stations in this sector, for which the type of coding and modulation and the transmission power value are already selected using

- the share of the resource of the direct channel frame consumed jointly by all the service channels of the direct channel of all subscriber stations in this sector, for which the type of coding and modulation and the transmission power value are already selected, and the average size of the service stream data blocks transmitted in each frame,

- the type of coding and modulation and the value of the transmission power selected for this service stream,

- the specified position of the boundary between the frames of the forward and reverse channels,

- the number of frequency subchannels in the frame of the direct channel,

- the maximum value of the transmit power of this sector,

- take as the value of the load in the forward channel of the sector for a given position of the border between the frames of the forward and reverse channels the share of the resource of the frame of the forward channel consumed jointly by all the service flows of the forward channel of all subscriber stations in this sector.

In this case, the minimum value of the transmit power of the service flow of the direct channel of the urban network sector is determined in such a way that

- once in Ω1 frames, where Ω1 is greater than or equal to one, for the subscriber station to which this service flow belongs, the reception conditions in the direct channel of this sector are measured,

- transmit the measured reception conditions from the subscriber station to the serving sector,

- using the transmitted measured reception conditions and the corresponding transmit power values, the reception conditions in the current frame of the forward channel of this sector are predicted using

- forecast of reception conditions,

- a set of requirements for the quality of service of this service flow,

- the type of coding and modulation assigned to this service flow and

- the average size of the data blocks of this service stream transmitted in each frame,

- determine the minimum value of the transmit power of this service stream, at which its set of requirements for service quality is fulfilled.

The algorithm for the operation of determining for a subscriber station in the sector the value of the minimum fraction of the resource of a direct channel frame consumed only by this subscriber station can be conditionally divided into the following two steps (Fig. 6 shows the sixth and seventh steps), each of which includes a certain sequence of actions of the method.

First check condition D:

- whether at least one service flow of the direct channel of this subscriber station has remained, for which the type of coding and modulation and the value of the transmission power have not yet been selected.

If at least one service flow of the direct channel of this subscriber station remains, for which the type of coding and modulation and the value of the transmit power have not been selected, then proceed to the sixth step.

If there is not a single service flow of the direct channel of this subscriber station for which the type of coding and modulation and the value of the transmission power have not been selected, then go to the seventh step.

In the sixth step:

- choose the next service flow of the direct channel of this subscriber station with the maximum average size of the service flow data blocks transmitted in each frame,

- choose the type of coding and modulation and the value of the transmit power for this service flow.

After the sixth step, condition G. is checked.

In the seventh step:

- take as the value of the minimum fraction of the resource of the direct channel frame consumed only by this subscriber station, the share of the resource of the direct channel frame consumed jointly by all the service flows of the direct channel of this subscriber station.

On this, the operation of determining for the subscriber station in the sector the value of the minimum fraction of the resource of the direct channel frame consumed only by this subscriber station is completed.

The algorithm for the operation of determining the load value in the forward channel of the sector for a given position of the boundary between the frames of the forward and reverse channels can be conditionally divided into the following three steps (Fig. 8 shows the eighth, ninth and tenth steps), each of which includes a certain sequence of actions of the method.

First check condition D:

- whether at least one subscriber station of this sector remains, for the service flows of which the types of coding and modulation and transmission power values have not yet been selected.

If at least one subscriber station of this sector remains, for the service flows of which the types of coding and modulation and the transmission power have not yet been selected, then we proceed to the eighth step.

If there is not a single subscriber station in this sector left for the service flows of which the types of coding and modulation and transmission power have not yet been selected, then we proceed to the tenth step.

In the eighth step:

- choose the next subscriber station in this sector with the minimum value of the minimum fraction of the resource of the direct channel frame consumed only by this subscriber station.

After the eighth step, condition E is checked:

- whether at least one service flow of the direct channel of this subscriber station has remained, for which the type of coding and modulation and the value of the transmission power have not yet been selected.

If at least one service flow of the direct channel of this subscriber station has remained, for which the type of coding and modulation and the value of the transmission power have not been selected, then go to the ninth step.

If there is not a single service flow of the direct channel of this subscriber station for which the type of coding and modulation and the value of the transmit power have not been selected, then check condition D.

In the ninth step:

- choose the next service flow of the direct channel of this subscriber station with the maximum average size of the service flow data blocks transmitted in each frame,

- choose the type of coding and modulation and the value of the transmit power for this service flow.

After the ninth step, go to the tenth step.

In the tenth step:

- take as the value of the load in the forward channel of the sector for a given position of the border between the frames of the forward and reverse channels the share of the resource of the frame of the forward channel consumed jointly by all the service flows of the forward channel of all subscriber stations in this sector.

On this, the operation of determining the load value in the forward channel of the urban network sector for a given position of the boundary between the frames of the forward and reverse channels is completed.

Let us explain the operation of determining the load value in the reverse channel of the urban network sector for a given position of the boundary between the frames of the forward and reverse channels.

The value of the load in the reverse channel of the urban network sector for a given position of the boundary between the frames of the forward and reverse channels is determined in such a way that

- choose for all service flows the reverse channel of this sector, the type of coding and modulation under the number Q,

- choose for each service stream the return channel of this sector as the value of the transmit power, the minimum value of the transmit power at which a set of requirements for the quality of service of this service stream is satisfied,

- determine for each subscriber station in this sector the value of the minimum fraction of the resource of the reverse channel frame consumed only by this subscriber station, so that

- determine, for each service flow of the return channel of this subscriber station, the value of the average fraction of the maximum power of this subscriber station consumed by this service flow using

- the average size of the data blocks of this service stream transmitted in each frame,

- the type of coding and modulation and the value of the transmission power selected for this service stream,

- a predetermined position of the boundary between the frames of the forward and reverse channels and

- the maximum value of the transmit power of this subscriber station,

- if the sum of the values of the average fraction of the maximum power of this subscriber station consumed by each service flow of the return channel of this subscriber station exceeds one, then

- if there is at least one service flow of the return channel of this subscriber station, for which the selected number of the type of coding and modulation is more than one, then

- choose the service flow of the return channel of this subscriber station with a maximum average fraction of the maximum power of this subscriber station consumed by the service flow, for which the selected number of encoding and modulation type is greater than one,

- reduce by one the number of the type of coding and modulation selected for this service flow,

- choose for this service stream as the value of the transmission power, the minimum value of the transmission power at which a set of requirements for the quality of service of this service stream is satisfied,

- determine, for each service flow of the return channel of this subscriber station, the value of the average fraction of the maximum power of this subscriber station consumed by this service flow,

- determine the value of the minimum resource share of the reverse channel frame consumed only by this subscriber station, using

- the average size of the service flow data blocks transmitted in each frame for each service flow of the return channel of this subscriber station,

- the type of coding and modulation and the transmission power value selected for each service flow of the reverse channel of this subscriber station,

- a predetermined position of the boundary between the frames of the forward and reverse channels and

- the number of frequency subchannels in the frame of the reverse channel,

- take as the value of the load in the reverse channel of the sector for a given position of the boundary between the frames of the forward and reverse channels the sum of the values of the minimum share of the resource of the frame of the reverse channel consumed by each subscriber station in this sector.

In this case, the minimum value of the transmit power of the service flow of the reverse channel of the urban network sector is determined in such a way that

- once in Ω2 frames, where Ω2 is greater than or equal to one, for the subscriber station to which this service flow belongs, the reception conditions in the return channel of this sector are measured,

- using the measured reception conditions and the corresponding transmit power values, the reception conditions in the current frame of the reverse channel of this sector are predicted using

- forecast of reception conditions,

- a set of requirements for the quality of service of this service flow,

- the type of coding and modulation assigned to this service flow and

- the average size of the data blocks of this service stream transmitted in each frame,

- determine the minimum value of the transmit power of this service stream, at which its set of requirements for service quality is fulfilled.

The algorithm for the operation of determining for each subscriber station in the sector the values of the minimum share of the resource of the reverse channel frame consumed only by this subscriber station can conditionally be divided into the following three steps (Fig. 11 shows the eleventh, twelfth and thirteenth steps), each of which includes a certain sequence action method.

In the eleventh step:

- determine, for each service flow of the return channel of this subscriber station, the value of the average fraction of the maximum power of this subscriber station consumed by this service flow.

After the eleventh step, condition K is checked:

- Does the unit exceed the sum of the values of the average fraction of the maximum power of this subscriber station consumed by each service flow of the return channel of this subscriber station.

If the sum of the values of the average fraction of the maximum power of this subscriber station consumed by each service flow of the return channel of this subscriber station does not exceed unity, then go to the thirteenth step.

If the sum of the values of the average fraction of the maximum power of this subscriber station consumed by each service flow of the return channel of this subscriber station exceeds one, then check condition A:

- whether at least one service flow of the return channel of this subscriber station remains for which the selected number of the type of coding and modulation is greater than one.

If there is not a single service flow of the return channel of this subscriber station for which the selected coding and modulation type number is greater than one, then go to the thirteenth step.

If at least one service flow of the return channel of this subscriber station is left, for which the selected number of the type of coding and modulation is greater than one, then go to the twelfth step.

In the twelfth step:

- choose the service flow of the return channel of this subscriber station with a maximum average fraction of the maximum power of this subscriber station consumed by the service flow, for which the selected number of encoding and modulation type is greater than one,

- reduce by one the number of the type of coding and modulation selected for this service flow,

- choose for this service stream as the value of the transmission power the minimum value of the transmission power at which a set of requirements for the quality of service of this service stream is satisfied.

After the twelfth step, go to the eleventh step.

In the thirteenth step:

- determine the value of the minimum share of the resource of the reverse channel frame consumed only by this subscriber station.

On this, the operation of determining for each subscriber station in the sector the value of the minimum fraction of the resource of the reverse channel frame consumed only by this subscriber station is completed.

The inventive method of handover of subscriber stations in a hybrid wireless network according to the IEEE 802.16e OFDMA, IEEE 802.11b and cdma2000 1xEV-DO standards has the following significant advantages over the inventions known in the art.

Firstly, the inventive method allows for the provision of quality of service for all service flows of a hybrid wireless network when handing subscriber stations between sectors of a hybrid wireless network. This advantage is achieved by transferring service to the subscriber station only to sectors from the set of its allowed sectors, in which the quality of service requirements for all its service flows are met.

Secondly, the inventive method can significantly increase the maximum throughput of a hybrid wireless network and reduce the likelihood of congestion in its sectors. According to the simulation results of the proposed method, a significant increase in the maximum throughput of the hybrid wireless network (FIG. 10) and a decrease in the probability of congestion in the sectors of the hybrid wireless network (FIG. 11) in comparison with the known solutions were achieved. This advantage is achieved by minimizing the maximum load on the sector in each subset of the set of all sectors of the wireless network when choosing a new set of serving sectors.

Claims (14)

1. A method for handover of subscriber stations in a hybrid wireless network according to IEEE 802.16e OFDMA, IEEE 802.11b and cdma2000 1xEV-DO standards, wherein the hybrid wireless network includes urban network sectors according to IEEE 802.16e OFDMA, local network sectors according to IEEE 802.11 b and cdma2000 1xEV-DO cellular network sectors, the hybrid wireless network includes K sectors, where K is greater than or equal to two, and at least one subscriber station, each sector and each subscriber station have restrictions on the maximum transmit power, each subscriber The station has one or more service flows in the forward channel, or one or more service flows in the return channel, or one or more service flows in the forward channel and one or more service flows in the reverse channel, each service stream is given a set of requirements for the quality of service , in sectors of the city network, time duplex, time-frequency division multiple access, and a frame structure with frequency diversity are used, the frame includes a forward channel frame and a reverse channel frame, the animation between frames of the forward and reverse channels adaptively varies from frame to frame, during transmission, each service flow is assigned a type of coding and modulation and a value of transmission power, while the types of coding and modulation are numbered in ascending order of transmission speed, starting from one and ending with number Q, in the sectors of the local network, during transmission of each subscriber station, transmission parameters are assigned, including the transmission rate, the fragment size of the data block and the transmission mechanism, in the sectors of the cellular network during transmission in the forward channel, each service stream is assigned the transmission speed and maximum transmission power, when transmitting in the return channel of each subscriber station, the transmission speed is assigned, when transmitting in the return channel, each service stream is assigned the transmission power, the maximum allowable values for exceeding the noise level over thermal noise are set for forward and reverse channels, which consists in the fact that periodically, once in a time interval T, a new set of serving sectors is selected for all subscriber stations so that they select for each subscriber station a set of allowed sectors in which the quality of service requirements for all service flows of this subscriber station are satisfied, so that for sectors of the urban network, for each sector, the load value of this subscriber station per sector is determined as the load value to this sector, created during servicing in it only of this subscriber station, using the load values in the forward and reverse channels of this sector, created during servicing in only for this subscriber station, for an arbitrary position of the boundary between frames of the forward and reverse channels, optimal, when serving only this subscriber station in this sector, the position of the border between frames of the forward and reverse channels determines the value of the minimum fraction of the maximum power of this subscriber station for each sector consumed during servicing in this sector of this subscriber station only, each sector for which the load value of this subscriber is included in the set of permitted sectors stations per sector is less than or equal to one, and the value of the minimum fraction of the maximum power of this subscriber station consumed when serving only this subscriber station in this sector is less than or equal to unity, for each sector of the local network, the load value of this subscriber station per sector is determined as the value of the load on this sector created when serving only this subscriber station in it, using the quality of service requirements for each service flow of this subscriber station ii, the value of the maximum throughput of the sector when serving only this subscriber station in it, select the optimal transmission parameters for each subscriber station for each sector, check for each sector the quality of service requirements for each service flow of this subscriber station for the selected optimal transmission parameters, each sector is included in the set of allowed sectors for which the load value of this subscriber station per sector is less than or equal to one, and t Quality service requirements for each service flow of this subscriber station for the selected optimal transmission parameters, for sectors of the cellular network, for each sector, determine the load of this subscriber station per sector, using the quality of service requirements for each service flow of the direct channel of this subscriber station, reception conditions in the direct channel of this sector for this subscriber station, the restriction on the maximum transmit power of this sector, the number of code channels available for re cottages in the return channel of this sector, determine for each sector the value of the minimum share of resources of this subscriber station consumed during servicing in this sector, using the quality of service requirements for each service flow of the return channel of this subscriber station, the reception conditions in the return channel of this sector for this subscriber station, a limitation on the maximum transmit power of this subscriber station, include in the set of allowed sectors each sector for which the load value of this subscriber station station in this sector is less than or equal to one, and the value of the minimum fraction of the resources of this subscriber station consumed during servicing in this sector is less than or equal to one, and the minimum transmit power necessary to satisfy the quality of service requirements for each service flow of the direct channel of this subscriber station, does not exceed the limit on the maximum transmit power of this sector, form the initial set of serving sectors, including in it for each subscriber station the sector with the smallest among its allowed sectors, by the value of the load of this subscriber station per sector, in (K-1) steps a new set of serving sectors is selected so as to minimize the maximum load on the sector in each subset of the set of all sectors of the wireless network, provided that the new serving sector for each subscriber station is selected from its set of allowed sectors, while the load value on the urban network sector is determined using the load values in the forward and reverse channels of this sector for arbitrary about the position of the border between frames of the forward and reverse channels, the optimal position of the border between frames of the forward and reverse channels, the load on the local network sector is determined using the requirements for the quality of service for each service flow in this sector, the value of the maximum throughput of this sector, the load value on the cellular network sector is determined using the quality of service requirements for each service flow of this sector, the reception conditions in the forward and reverse channels for each subscriber station of this sector, restrictions on the maximum transmit power of this sector and each subscriber station, the values of the excess noise level over thermal noise in the forward and reverse channels of this sector, the maximum allowable values of the excess noise level over thermal noise for the forward and reverse channels, number of subscriber stations in this sector, the number of code channels available for transmission in the reverse channel of this sector, at the first stage select the first intermediate set of serving sectors using I am the initial set of service sectors, so as to minimize the maximum load on the sector in the set of all K sectors, if K is more than two, then include the sector with the maximum value of the load on the sector in a new set of service sectors as a service sector for all subscriber stations that it serves, exclude from further consideration this sector and all subscriber stations that it serves, otherwise include each of the two sectors of the selected intermediate set in a new set of serving sectors as serving sectors for all subscriber stations that they serve, if K is more than three, then at the intermediate k-th stage, where k changes from two to (K-2), choose the k-th intermediate set of serving sectors using ( k-1) -th intermediate set of serving sectors, so as to minimize the maximum load on the sector in the set of (K-k + 1) sectors, including all sectors except those excluded in the previous from the first to (k-1) -th stages , include the sector with the maximum load per sector in a new set of services living sectors as a serving sector for all subscriber stations that he serves exclude from further consideration this sector and all subscriber stations that he serves, if K> 2, then at the last (K-1) th stage, select (K- 1) the intermediate set of serving sectors, using the (K-2) -th intermediate set of serving sectors, so as to minimize the maximum load on the sector in the set of two sectors, including all sectors except those excluded from the previous from the first to (K- 2) stages include Each of the two sectors of the selected intermediate set to a new set of serving sectors as serving sectors for all subscriber stations that they serve transfer the service of the subscriber station from the current serving sector to a new serving sector for each subscriber station for which the new serving sector does not coincide with the current service sector. 2. The method according to claim 1, characterized in that the time interval T is selected using the rate of change of conditions affecting the value of the maximum load on the sector in the sectors of the hybrid wireless network, the overhead necessary to minimize the maximum load on the sector in the sectors of the hybrid wireless network and during handover of subscriber stations in a wireless network. 3. The method according to claim 1, characterized in that the value of the minimum fraction of the maximum power of the subscriber station consumed during servicing in the urban network sector of only this subscriber station is determined using the average size of service stream data blocks transmitted in each frame for of each service flow of the return channel of this subscriber station, the types of coding and modulation and transmission power values selected for each service flow of the return channel of this subscriber station when determining The values of the load of the subscriber station to the sector, the optimum position of the boundary between frames forward and reverse channel selected in determining the load values of the subscriber station to the sector, the maximum transmission power of the subscriber station. 4. The method according to claim 1, characterized in that the fulfillment of the quality of service requirements for each service flow of the subscriber station, when servicing in the local network sector, for optimal transmission parameters, is checked using the transmission parameters optimal for this sector for this subscriber station, requirements for the quality of service for each service flow of this subscriber station, reception conditions in the forward and reverse channels of this sector for this subscriber station, the number of active subscriber stations in this sector. 5. The method according to claim 1, characterized in that the first intermediate set of serving sectors is selected so that all sectors from the initial set of serving sectors are included in the first intermediate set of serving sectors, the sector load value is determined for each sector of the first intermediate set, the sector is selected from the first intermediate set of sectors with the maximum value of the load on the sector, select the next subscriber station in this sector with the maximum value of the load of the subscriber station for this sec OP, select another sector for this subscriber station from its set of allowed sectors with a minimum load of this subscriber station on a sector that does not match its current serving sector, determine the load on the sector for the selected sector for this subscriber station and for its current serving sector provided that it is served in the sector selected for this subscriber station, if each of these two values is less than the sector load for the current serving sector of this subscriber ntskoy station servicing provided in it, for this include the selected subscriber station sector in a first intermediate set as its serving sector is selected from a first set of the intermediate sector with a maximum load per sector. 6. The method according to claim 1, characterized in that the k-th intermediate set of serving sectors is selected so that all sectors from the (k-1) -th intermediate set of serving sectors are included in the k-th intermediate set of serving sectors, are determined for of each sector of the k-th intermediate set, the value of the load on the sector, choose from the k-th intermediate set the sector with the maximum value of the load on the sector, select the next subscriber station in this sector with the maximum value of the load of the subscriber station on this sector, select the next sector with the minimum value of the load of this subscriber station on a sector included in the k-th intermediate set of serving sectors and not coinciding with its current serving sector is scoured for this subscriber station from its set of allowed sectors, the values of the sector load for the selected for this subscriber are determined station of the sector and for its current serving sector, provided that it is served in the sector selected for this subscriber station, if each of these two values is less than the load value per second If the sector for the current serving sector of this subscriber station is subject to its service in it, then the sector selected for this subscriber station is included in the kth intermediate set as its serving sector, the sector with the maximum value of the sector load is selected from the kth intermediate set. 7. The method according to claim 1, characterized in that the (K-1) -th intermediate set of serving sectors is selected so that all sectors from (K-2) - are included in the (K-1) -th intermediate set of serving sectors th intermediate set of serving sectors, determine the sector load value for each sector of the (K-1) th intermediate set, select the sector with the maximum load per sector from the (K-1) th intermediate set, select the next subscriber station of this sector with the maximum load of the subscriber station in this se Ctor, choose another sector for this subscriber station from its set of allowed sectors with a minimum load of this subscriber station on a sector included in the (K-1) -th intermediate set of serving sectors and not matching its current serving sector, determine the load values on sector for the sector selected for this subscriber station and for its current serving sector, provided that it is served in the sector selected for this subscriber station, if each of these two values is less than the value loads per sector for the current serving sector of this subscriber station, subject to its service in it, then include the sector selected for this subscriber station in the (K-1) -th intermediate set as its serving sector, choose from (K-1) -th intermediate set sector with the maximum value of the load on the sector. 8. The method according to any one of claims 1, 5-7, characterized in that the load value on the cellular network sector is determined in such a way that the value of the excess noise level over thermal noise in the forward channel of this sector is measured, and the value of the excess noise level over the thermal is measured noise in the return channel of this sector, using quality of service requirements for each service flow in this sector, reception conditions in the forward and reverse channels for each subscriber station in this sector, limitation on the maximum transmission power of this sector a, restrictions on the maximum power of each subscriber station in this sector, the values of the excess noise level over thermal noise in the forward and reverse channels of this sector, the maximum allowable values for the excess noise level over thermal noise for the forward and reverse channels, the number of subscriber stations in this sector, the number code channels available for transmission in the reverse channel of this sector, determine the value of the load on the sector. 9. The method according to any one of claims 1, 5-7, characterized in that the load value on the local network sector is determined in such a way that for each subscriber station in this sector, the conditional value of the maximum throughput of this sector is determined, provided that the remaining subscriber stations this sector are in the same reception conditions, determine the value of the maximum throughput of this sector as the arithmetic mean of the conditional values of the maximum throughput of this sector for each subscriber Antium this sector, define minimum bandwidth sector, necessary to meet the requirements of quality of service for all service flows of the sector, determine the value of the load on the sector as a ratio of the minimum required bandwidth sector to the maximum capacity of the sector. 10. The method according to any one of claims 1, 5-7, characterized in that the load value on the urban network sector is determined in such a way that the load value in the forward channel of the sector is determined for the middle position of the boundary between the frames of the forward and reverse channels, the load value is determined in the sector back channel for the middle position of the boundary between the frames of the forward and reverse channels, determine the optimal border position between the frames of the forward and reverse channels using the load value in the forward channel of the sector for the middle position the boundary between frames of the forward and reverse channels, the value of the load in the reverse channel of the sector for the average position of the border between the frames of the forward and reverse channels, the duration of the frame, using the optimal position of the boundary between the frames of the forward and reverse channels, the value of the load in the forward channel of the sector for the average position of the boundary between frames of the forward and reverse channels, the load value in the reverse channel of the sector for the average position of the boundary between frames of the forward and reverse channels, the duration of the frame, determine starting load on the sector. 11. The method according to claim 10, characterized in that the load value in the forward channel of the urban network sector for a given position of the boundary between the frames of the forward and reverse channels is determined in such a way that the minimum share of the resource of the forward channel frame is determined for each subscriber station in this sector, consumed only by this subscriber station, in such a way that they select the next service flow of the direct channel of this subscriber station with the maximum average size of service stream data blocks transmitted to each frame, select the coding and modulation type and transmission power value for this service stream in such a way as to minimize the share of the forward channel frame resource consumed by this service stream together with all the direct channel service flows of this subscriber station, for which the coding and modulation type and power value transmissions have already been selected, and the minimum value of the transmission power of this service stream, at which its set of requirements for the quality of service, determine the share of the resource of the direct channel frame consumed by this service stream together with all the service flows of the direct channel of this subscriber station, for which the type of coding and modulation and the value of the transmit power are already selected using the share of the resource of the frame of the direct channel consumed jointly by all service flows direct channel of this subscriber station, for which the type of coding and modulation and the value of the transmit power have already been selected, the average size of the data blocks of the service stream, we transmit x in each frame, the type of coding and modulation and the value of the transmission power selected for this service stream, the specified position of the boundary between the frames of the forward and reverse channels, the number of frequency subchannels in the frame of the forward channel, the maximum value of the transmission power of this sector, is taken as the minimum value resource shares of the direct channel frame consumed only by this subscriber station, resource fraction of the direct channel frame consumed jointly by all service flows of the direct channel of this subscriber station , determine the value of the load in the forward channel of the sector for a given position of the boundary between the frames of the forward and reverse channels in such a way that they select the next subscriber station in this sector with a minimum value of the minimum share of the resource of the forward channel frame consumed only by this subscriber station, select the next service flow of the forward channel of this subscriber station with the maximum average size of service stream data blocks transmitted in each frame, select the encoding type for this service stream and modulation and the value of the transmission power in such a way as to minimize the fraction of the resource of the direct channel frame consumed by this service stream together with all the service channels of the direct channel of all subscriber stations in this sector, for which the type of coding and modulation and the value of the transmission power are already selected, choose the minimum value of the transmission power of this service stream as the value of the transmission power, at which its set of requirements for the quality of service is satisfied, determine the share of the resource direct channel hell consumed by this service stream together with all direct channel service flows of all subscriber stations in this sector for which the coding and modulation type and transmission power value have already been selected using the share of the direct channel frame resource consumed jointly by all direct channel service flows of all subscriber stations stations of this sector, for which the type of coding and modulation and the value of the transmission power have already been selected, the average size of service stream data blocks transmitted in each frame e, the type of coding and modulation and the transmission power value selected for this service stream, the specified position of the boundary between the frames of the forward and reverse channels, the number of frequency subchannels in the frame of the forward channel, the maximum value of the transmission power of this sector, is taken as the load value in the forward channel sectors for a given position of the boundary between the frames of the forward and reverse channels, the share of the resource of the frame of the forward channel consumed jointly by all service flows of the forward channel of all subscriber stations th sector. 12. The method according to claim 10, characterized in that the load value in the reverse channel of the urban network sector for a given position of the boundary between the frames of the forward and reverse channels is determined in such a way that for all service flows of the reverse channel of this sector the coding and modulation mode is selected under the number Q, for each service flow of the reverse channel of this sector, as the value of the transmit power, select the minimum value of the transmit power at which a set of requirements for the quality of service of this service current, determine for each subscriber station in this sector the value of the minimum fraction of the resource of the reverse channel frame consumed only by this subscriber station, so that for each service flow of the return channel of this subscriber station the average fraction of the maximum power of this subscriber station consumed by this service is determined by the stream, using the average size of the data blocks of this service stream transmitted in each frame, the type of coding and modulation and the value of the transmission power selected required for this service flow, the specified position of the boundary between the frames of the forward and reverse channels, the maximum value of the transmit power of this subscriber station, if the sum of the values of the average fraction of the maximum power of this subscriber station consumed by each service flow of the return channel of this subscriber station exceeds unity, then if there is at least one service flow of the return channel of this subscriber station, for which the selected number of the type of coding and modulation is greater than one, then select the service by ok, the return channel of this subscriber station with the maximum average share of the maximum power of this subscriber station consumed by the service stream, for which the selected coding and modulation type number is greater than one, reduce the coding and modulation type number selected for this service stream by one, choose this service flow as the value of the transmission power, the minimum value of the transmission power at which a set of requirements for the quality of service of this service flow is satisfied, determines for each service flow of the return channel of this subscriber station, the value of the average fraction of the maximum power of this subscriber station consumed by this service flow determines the value of the minimum fraction of the resource of the reverse channel frame consumed only by this subscriber station using the average size of service flow data blocks transmitted to each frame, for each service flow of the reverse channel of this subscriber station, the type of coding and modulation and the value of the transmit power selected for each of the service flow of the return channel of this subscriber station, the specified position of the boundary between the frames of the forward and reverse channels, the number of frequency subchannels in the frame of the reverse channel, is taken as the load value in the reverse channel of the sector for the specified position of the boundary between the frames of the forward and reverse channels the resource of the reverse channel frame consumed by each subscriber station in this sector. 13. The method according to claim 11, characterized in that the minimum value of the transmit power of the service stream of the direct channel of the urban network sector is determined in such a way that once in Ω1 frames, where Ω1 is greater than or equal to one, for the subscriber station to which this service stream belongs measure the reception conditions in the direct channel of this sector, transmit the measured reception conditions from the subscriber station to the serving sector, using the transmitted measured reception conditions and the corresponding transmit power values, predict the reception conditions and in the current frame of the direct channel of this sector, using the forecast of reception conditions, the set of requirements for the quality of service of this service stream, the type of coding and modulation assigned to this service stream, the average size of the data blocks of this service stream transmitted in each frame, determine the minimum power value transmission of this service flow, in which its set of requirements for service quality is fulfilled. 14. The method according to p. 12, characterized in that the minimum value of the transmit power of the service flow of the reverse channel of the urban network sector is determined in such a way that every Ω2 frames, where Ω2 is greater than or equal to one, for the subscriber station to which this service flow belongs , the reception conditions in the return channel of this sector are measured using the measured reception conditions and the corresponding transmit power values, the reception conditions in the current frame of the reverse channel of this sector are predicted using the forecast of the reception conditions, set Required for the quality of service of the service flow, type of coding and modulation, assigned to that service flow, average size of the data blocks of the service flow transmitted in each frame, determining a minimum transmission power value of this service stream, running it a set of requirements for quality of service.

Images