WO2016142593A1

WO2016142593A1 - Increase in the capacity of telecommunication systems by causation and cancellation of interference and application to cellular radio communication

Info

Publication number: WO2016142593A1
Application number: PCT/FR2016/000042
Authority: WO
Inventors: François ASSROUR
Original assignee: Assrour François
Priority date: 2015-03-10
Filing date: 2016-03-10
Publication date: 2016-09-15
Also published as: FR3033676A1

Abstract

The invention relates to a method and to a device which are intended to increase the capacity of telecommunication systems or networks by channel re-use and interference cancellation, the information necessary for cancellation being transmitted by a support network to the suitable means. This amounts to transferring a portion of the communication capacity of the support network to the service. Applying the method to a cellular radio-communication system makes it possible to illustrate the steps in the method: an uplink channel (downlink channel, respectively) of a call in progress in a cell of the downlink channel (uplink channel, respectively) is assigned to an additional call supported by the same cell or by a cell of the same cellular pattern; the information necessary for generating the cancellation signals is sent over an extension of the internal network; chains for transmitting or receiving the cancellation signals are fed in at intermediate frequency and the derived signals are processed normally. The device makes it possible to carry out the steps in the method. One embodiment applied to cellular systems comprises modules for detecting and selecting the channels, modules for measuring channel transfer functions, modules for generating the cancellation signals, modules for synchronization, modules for adaptive filtering prediction and a support network, the function of which is to send the commands, the parameters and the information necessary for the smooth running of the operations.

Description

Title of the invention

Increasing the capacity of telecommunication systems by provoking and canceling interference, application to cellular radiocommunications.

Technical area

The technical field of the present invention is located in the

telecommunications in the broad sense, the purpose of the invention being to increase the communication capacity of telecommunication systems including those of cellular radiocommunications.

Prior art

Advances in electronic components, multiplexing, coding, modulations, antennas and signal processing have led to improved signal quality and spectral efficiency; Exploitation of the properties of signals in propagation, control of their powers, dynamic allocation of channels and frequencies have allowed and improved the reuse of frequencies in cellular networks; Interference cancellation techniques have improved coverage and quality of service. All these techniques and solutions contributed directly or indirectly to

the dramatic increase in the capacity of these networks over the last thirty years.

The problem is that these techniques and solutions now come up against physical and regulatory limits, so that it will be technically difficult to respond adequately to the growing demand for telecommunications services in the next twenty years. Regarding the cancellation of interference, this is limited today to improve compatibility

electromagnetic and the quality of communication service.

Presentation of the invention

The present invention consists of a method and a device for increasing the communication capability of telecommunication systems.

A telecommunication system comprises on the one hand an access network which makes it possible to connect the terminals of the users to the access points to the proposed telecommunication services, and on the other hand an internal network which makes it possible to communicate the internal components. of the system other than terminals.

Network access points include transmitters and receivers that communicate with transmitters and receivers in each user terminal. It should be clarified that communication capacity here refers to the maximum number of communications that a network or

telecommunication can simultaneously provide or aggregate maximum basic information rate per unit of time that it can make available to the users or both.

The method according to the invention aims to increase the capacity of telecommunication systems or networks characterized in that it comprises the following steps:

- Reuse already occupied channels,

- Cancel or mitigate the damage caused to the information transmitted in these channels due to interference,

- Route to the means intended for the cancellation or reduction of said alterations the information required by a telecommunication network.

The reused channels are additional channels that increase the capacity of the telecommunication systems, through the routing by another network of information necessary for the cancellation or reduction of alterations.

In this application channel assignment is dynamically reiterated to increase system capacity while meeting QoS objectives.

Thus, the method according to the invention is characterized in that it allows to transfer all or part of the capacity of one or more networks to one or more other networks.

As an example, a portion of the capacity of the internal fiber network of a cellular system can be transferred to the access network, enabling more simultaneous communications to be supported or offering users a higher digital bit rate. important.

The best way to realize the invention and apply it to cellular radio systems.

In this case, the method according to the invention applied to cellular systems is characterized in that the reuse of channels of the access network consists in assigning a frequency channel used for a rising link (respectively downlink), a communication already in progress in a first cell, downlink (respectively amount) of a new communication supported by the same cell or another cell of the same cell pattern. This reuse of the channels is dynamically reiterated so as to increase the capacity of the system while meeting quality of service objectives.

The repetition of these operations can lead to the limit where all the available frequencies are assigned to each cell, which tends to multiply the capacity by seven in the case where the cellular motifs considered is of order seven.

The device allowing the execution of the steps of the method applied to cellular radio communication systems is characterized in that it comprises at least one or more of the following elements and which are intended to equip existing or to be created systems:

- A module whose function is to detect and select the channels to be reused or to release them after reuse; he is designated in the following by "breeder",

- A module whose function is to measure the transfer functions of the channels of the upstream and downstream links; he is hereinafter referred to as "measurer",

- A module whose function is to generate the signals necessary for

cancellation or reduction of interference in the receivers; it is hereinafter referred to as "generator",

A module whose function is to synchronize these signals and the other elements of the device in coherence with the core clock; it is hereinafter referred to as "synchronizer",

- A module whose function is to determine the parameters for

generating the signals to be opposed to the interfering signals at a given time using predictive adaptive filtering; he is designated in what follows by "preacher",

- At least one support network whose function is to route the

information and signals necessary for the cancellation or reduction of interference and to allow the aforementioned modules and the core network; It is referred to in the following as "support network".

The selector determines which channels to reuse. In a variant of

- Realization of the device, a list of these channels is established in advance and managed by the core network.

The measurer regularly determines the parameters of the transfer function of each channel and communicates them to the generator. In an alternative embodiment of the device, these parameters can be established in advance in particular according to the geographical positions of the user terminals and the access points, and stored in a table.

The preacher is based on a predictive adaptive filtering, it receives as input the information exchanged in the channels concerned and which are delayed by the propagation delays, determines the parameters necessary to generate the nearest signals at a given time of the interfering signals and communicate these parameters to the generator; In an alternative embodiment of the device, the information may be presented to the generator shifted in time, but nevertheless synchronized, to generate the interfering signals if the result of the cancellation is considered acceptable.

The synchronizer synchronizes the elements of the device including the generator and the preacher and synchronizes with the system clock.

The generator regenerates the interfering signals from the above-mentioned parameters and the destination information of the terminals and access points, and inserts these signals into the transmission and reception channels of the access points so as to attenuate as much as possible or even cancel the interference in the receivers of access points and user terminals.

In a preferred embodiment of the embodiment, the generated signal is adjusted in amplitude and also in phase through synchronization, and then added in intermediate frequency so that it is in phase opposition with the interfering signal that we want to cancel.

In an embodiment of the device according to the invention, one or more of the aforementioned modules can be integrated directly into the access points to the network.

Description of the drawing

The drawing of FIG. 1 illustrates the device according to the invention in the case of a cellular radio communication system exploiting inter-cellular interference. The right arrows represent radiofrequency channels and the curved arrows represent interfering signals.

Detailed presentation of the best way to achieve

With reference to the drawing of Figure 1, a better way to achieve the invention and exploit inter-cell interference according to the following description.

Two access points (27) and (28) of two neighboring cells are selected by the selector (40) and each connected to a user terminal by pooling the communication channels, so that the radiofrequency channel ascending the first communication reuses the descending radiofrequency channel in the second and vice versa.

The first access point (27) sends by a network (9) the information (29) conveyed by the interfering signal (23) transmitted by its transmitter (11) in the upstream channel (21) and which disturbs the downstream channel reused (21). The generator (8) of the second access point (28) receives the information (29) and the parameters provided by the meters (31) and (15) and the preachers (5) and (1), and inserts the signal into the receiver (19) of said second access point for reducing or canceling the signal interferes. The signal deduced by this receiver (19) is processed normally. Symmetrically and simultaneously, an identical operation is implemented in the first access point (27) to reduce or cancel the interfering signal (24) and to derive the desired signal in the receiver (10). In this way, the inter-cell interferences that affect the two receivers of the two access points are reduced or even canceled.

Furthermore, the second access point (28) sends the network (9) to the first access point (27) the information (30) of the signal deduced by the previous process by its receiver (19). A generator (4) located in the first access point (27) regenerates the signal using its information (30) and the parameters communicated by the meters (31) and (15) and the preachers (5) and (1). This time, a generator (3) generates the cancellation signal and inserts it into the transmitting channel of the transmitter (11) of the first access point (27) calibrated in amplitude, synchronized and whose phase is set so that it is in the receiver (14) of the first user terminal (12) in phase opposition with the interfering signal (25) transmitted by the transmitter (18) of the user terminal (16). ). Said interfering signal (25) is thus reduced or canceled in said receiver (14) which normally processes the deduced signal. Symmetrically, in an identical operation in the access bridge (28) which results in its transmitter (20) transmitting a composite signal which reduces or cancels the interfering signal (26) in the receiver (17).

It should be specified that the information (29) communicated by the first access point (27) to the access point (28) includes the information exchanged between this access point and the first user terminal (12). Similarly, the information (30) communicated by the second access point (28) to the first access point (27) comprises the information exchanged between said second access point (28) and the second terminal of user (16). Thus, the aforementioned generators (3) and (8) generate the signals necessary to reduce or cancel the aforementioned interfering signals (25) and (26) and the aforementioned interfering signals (23) and (24) which are composite signals comprising the signals intended for user terminals and signals that oppose the interfering signals (25) and (26).

Thus, the two communications use two frequency channels

instead of four.

The reiteration of these operations as many times as possible, in a situation where the information (29) and (30) comprise all the information exchanged in all the cells of the same pattern and that the signals inserted by the generators are composed so as to to oppose in the receivers to all the interfering signals, can lead to the limit to use in each cell all the spectrum allocated to the system. In this situation, each cell shares the upstream and downstream channels of these communications with all the neighboring cells.

This resulted in a controlled interference ecosystem that increases the capacity of cellular radio systems.

Possibilities of industrial application

The method and the device are particularly intended for the infrastructures of the cellular radiocommunication networks. They are to be implemented in the components of these networks, components that are manufactured by industries in the field of telecommunications. The possibility of an industrial application lies at least in the fact that the implementation of the invention involves the manufacture on an industrial scale of the modules that make up the device according to the invention.

Claims

claims

1) Process for increasing the capacity of systems or networks of

telecommunication characterized in that it comprises the following steps:

- Reuse already occupied channels,

- Route to the means intended for the cancellation or reduction of said alterations the information required by a telecommunications network,

2) Method according to claim 1 characterized in that it allows to transfer all or part of the capacity of one or more networks to one or more other networks,

3) Method according to claim 1 applied to cellular systems characterized in that the reuse of channels of the access network consists in assigning a frequency channel used for a rising link (respectively downlink), a communication already in progress in a first cell, downlink (respectively amount) of a new communication supported by the same cell or another cell of the same cell pattern,

4) Process according to claim 3 characterized in that the reuse of the channels is dynamically reiterated so as to increase the capacity of the system while respecting quality of service objectives.

5) Device for performing the steps of the method applied to cellular radio communication systems characterized in that it comprises at least one or more of the following elements and which are intended to equip existing systems or to create:

- A module whose function is to detect and select the channels to be reused or to release them after reuse; he is referred to in the following as "coach"

- A module whose function is to measure the transfer functions of the channels of the upstream and downstream links; he is referred to in the following as "measurer"

- A module whose function is to generate the signals necessary for the cancellation of interference in the receivers; he is designated in the following by

"generator".

A module whose function is to synchronize these signals and the other elements of the device in coherence with the core clock; it is referred to in the following as "synchronizer". A module whose function is to determine the parameters for generating the signals to be opposed to the interfering signals at a given moment by means of a predictive adaptive filtering; he is designated in what follows by "preacher",

- At least one support network whose function is to route the commands parameters and information and to allow the aforementioned modules and the core network to communicate with each other; It is referred to in the following as "support network"

6) Device according to claim 5 characterized in that the support network is different from the access network,

7) Device according to claim 5 characterized in that the support network is a part or an extension of the internal network,

8) Device according to claim 5 characterized in that a list of channels to be reused is established in advance and managed by the core network.

9) Device according to claim 5 characterized in that the meter regularly determines the parameters of the transfer function of each channel and communicates to the generator,

10) Device according to claim 9 characterized in that the parameters of the transfer function can be established in advance, in particular according to the geographical positions of the user terminals and access points, and stored in a table.

11) Device according to claim 5 characterized in that the preacher is based on a predictive adaptive filtering, it receives as input the information exchanged in the channels concerned and which are delayed by propagation delays, determines the parameters necessary to generate the signals the closest to a given moment of interfering signals and communicates these parameters to the generator,

12) Device according to claim 11 characterized in that the information presented to the generator are shifted in time and synchronized to generate the interfering signals,

13) Device according to claim 5 characterized in that the synchronizer synchronizes the elements of the device including the generator and the preacher and synchronizes with the system clock,

14) Device according to claim 5 characterized in that the generator regenerates the interfering signals from signals and information destined terminals and access points, and inserts these signals in the transmission and reception channels of access points to minimize or even eliminate interference in the receivers of access points and user terminals.

15) Device according to claim 5 characterized in that the generated signal is adjusted in amplitude and also in phase through the synchronization, then added in intermediate frequency so that it is in phase opposition with the signal interfere we want to cancel.

16) Device according to at least one of claims 5 characterized in that one or more aforementioned modules can be integrated directly into the access points to the network.