Transmitter device and method for controlling a transmitter device

Abstract

Provided is a first transmitter device applied to a wireless network and used for transmitting signals on a first channel. The first transmitter device includes a control unit configured to identify at least one second transmitter device that transmits on the first channel in the wireless network. The control unit is further configured to obtain location information related to the location of a first user terminal communicating with the second transmitter device, and suppress the transmission energy from the first transmitter device in at least a selected first direction to avoid interfering with the signals transmitted by the at least one second transmitter device.

Description

Technical Field

[0001] The present application generally relates to the field of wireless communication technologies, and more particularly, to a transmitter device and a method for controlling the transmitter device to transmit on a channel in a wireless network with multiple transmitter devices. Background Art

[0002] With the rapid growth in the number of communication devices, the concern for communication reliability in wireless networks has become increasingly prominent. The traditional carrier sense multiple access collision avoidance (CSMA / CA) access method can be used, so that in a wireless network, multiple transmitter devices can use the same communication channel. Using the CSMA / CA access method, multiple access points (APs) can use the same channel and space (shared media) when the number of available channels is less than the number of APs. However, the CSMA / CA access method only allows one user to transmit at a time, while other users are idle (when in the same frequency band and close to each other). In addition, the CSMA / CA access method increases the probability of collisions and hidden nodes, resulting in an increase in the packet error rate (PER) and the noise level. In high density (HD) and very high density (VHD) deployments, the distance between cells is small (usually 10 meters to 30 meters), which increases the unused time (or "sharing time") of Wi-Fi devices. As long as the devices detect a signal strength higher than the CCA threshold, they will defer from the media. Therefore, in many HD / VHD deployments, the throughput of each channel is almost fixed, and the throughput decreases as the number of APs per channel increases. Thus, adding APs during deployment usually does not significantly increase the network data rate.

[0003] Newly proposed wireless communication standards, such as IEEE 802.11TGax (sometimes referred to as the IEEE 802.11ax standard or simply 11ax, also known as the high-efficiency wireless (HEW) standard), focus on mechanisms to provide a consistent and reliable data stream (average throughput) for more users in the presence of many other users. To improve the system-level performance and efficiency of the CSMA / CA access method in HD / VHD scenarios, the 802.11ax standard implements spatial reuse (SR) technology. SR technology allows sharing of the medium between two or more transmitter devices using the same channel, time, and space. To enable receiver devices to select their transmitters in an SR environment, a station (STA) can adopt a basic service set (BSS) coloring mechanism to identify signals. When a station actively listening to the medium detects an 802.11ax frame, it checks the BSS coloring bit. If the BSS color in the detected physical layer convergence procedure (PLCP) protocol data unit (PPDU) is the same as the color announced by the associated AP, the STA considers the frame to be an in-BSS frame. However, if the detected frame has a different BSS color from its own, the STA considers the frame to be from an overlapping BSS, an inter-BSS frame. Only during the period when the STA verifies whether the frame is an inter-BSS frame does the 802.11ax device consider the medium to be CCA-BUSY, but this period does not exceed the specified frame payload time length. In this way, multiple devices use the medium (frequency, time, and space) through the SR technology in the 802.11ax standard, avoiding conflicts between packets from these devices. The SR concept enables multiple devices to share the same frequency, time, and space through different BSS colors and IDs.

[0004] As described above, the transmitter device can adopt the traditional SR method so that multiple transmitter devices can better use the same communication channel at the same time. The AP accessing the medium initiates an SR session, and this AP is called the "SR initiator AP" (IAP), indicating its willingness to share the medium with other APs. Other APs with data to transmit may start using the medium, and these APs are called participant APs (PAPs). The main challenge of SR is to adjust the CCA threshold and the transmit (Tx) power level to avoid interference between the IAP and the PAP. The main idea behind these adjustments is that the CCA threshold should be at the maximum level and the Tx power should be at the minimum level, that is, to work only with STAs in the close proximity. In the implementation of the known SR method, the PAP reduces its Tx power to reduce interference to the IAP. However, reducing the Tx power greatly reduces the cell coverage radius. Therefore, only a few users assigned to the PAP can take advantage of the SR method, while other users will not be covered. Using a low Tx power by the PAP may also require using a smaller modulation and coding scheme index value (MCS) in both the IAP and the PAP. This results in a decrease in the signal-to-interference-plus-noise ratio (SINR), an increase in retransmissions, and poor performance, thus reducing the overall efficiency of the wireless communication network. In summary, adaptive Tx power and CCA threshold can enable SR, but may reduce the efficiency of SR due to the low probability of adjacent APs joining the IAP SR opportunity and the use of smaller MCS values by the PAP / IAP.

[0005] In some scenarios, the transmitter device can use adaptive Tx power (usually to reduce Tx power), while using an adjustable sensitivity threshold at the receiver side to avoid interference between adjacent APs. However, reducing the Tx power of the PAP according to the 802.11TGax requirements does not prevent an increase in interference at the IAP receiver side (when more than one PAP may be involved in the SR). This in turn requires reducing the PHY rate of the PAP (including MCS, SS, BW, etc.) assuming the presence of IAP interference, thereby reducing the PAP cell size and the probability of the AP participating in the SR. In other scenarios, in the case where multiple transmitter devices use the same channel simultaneously, the transmitter device can use the traditional beam-forming (BF) method. This method controls the narrow beam of the Tx power and makes better use of the same communication channel compared to the SR method. However, the traditional BF method cannot guarantee a low interference level, especially when the beam is not narrow enough. In addition, to achieve a very narrow beam (for example, at a beam width of 30 degrees, the probability of achieving 100% interference is 8.3%), large and costly antennas are required, or a large number of antennas need to be used for digital beamforming. For example, when using uniform linear array digital beamforming, with an element spacing of half a wavelength and the target being diagonal to the antenna, at least 16 antennas may be required to achieve the first null at the ±14-degree position. Thus, the traditional beamforming method is unreliable and cost-inefficient.

[0006] Therefore, based on the above discussion, it is necessary to overcome the above deficiencies of the traditional systems and methods in the wireless communication network so that multiple transmitter devices can use the same communication channel more efficiently. Summary of the Invention

[0007] This application aims to provide methods, devices, and computer program products for implementation in a wireless communication network. This application aims to provide a solution to address the inefficiency and unreliability issues that occur when multiple transmitter devices use the same communication channel in a wireless communication network. The objective of this application is to provide a solution that at least partially overcomes the problems encountered in the prior art and provides improved methods and devices such that multiple transmitter devices can use the same communication channel efficiently and reliably.

[0008] The objective of this application is achieved by the solution provided in the appended independent claims. Advantageous embodiments of this application are further defined in the dependent claims.

[0009] In a first aspect, a first transmitter device is provided that is applied to a wireless network and is used to transmit signals on a first channel. The first transmitter device includes a control unit configured to identify at least one second transmitter device that transmits on the first channel in the wireless network. The control unit also obtains location information related to the location of a first user terminal that communicates with the second transmitter device. The control unit further suppresses the transmission energy from the first transmitter device in at least a selected first direction to avoid interfering with the signals transmitted by the at least one second transmitter device.

[0010] The control unit in the first transmitter device is capable of identifying the second transmitter device, and when the second transmitter device initiates a spatial multiplexing session on the first channel, the first transmitter device can join the spatial multiplexing session. The control unit obtains the location of the first user equipment terminal that communicates with the second transmitter device. Then, the control unit adjusts the direction and intensity of the transmission energy of the first transmitter device. For example, the control unit suppresses the energy in the direction of the first user equipment to reduce interference in the channel. Additionally, by obtaining the location of the first user terminal, the first transmitter can increase its transmission power in other directions even when transmitting at a high transmission power without the risk of interference, thereby improving the total throughput of the channel.

[0011] In a possible implementation, the control unit is configured to identify a non-interfering user terminal that is from the direction of the first transmitter and is located in a direction different from the first direction, and control the first transmitter to communicate with the non-interfering user terminal.

[0012] The control unit identifies user terminals located in directions other than the first direction, and these user terminals are non-interfering user terminals with respect to the second transmitter device. This allows the control unit to increase the transmission power of the first transmitter device by redirecting more energy to the direction of the non-interfering user terminals without causing excessive interference to the second transmitter device.

[0013] In another possible implementation, the first transmitter device is configured to identify the at least one second transmitter when the second transmitter initiates a spatial multiplexing session.

[0014] The first transmitter device identifies the second transmitter device such that when the second transmitter device initiates a spatial multiplexing session, the first transmitter device can join the spatial multiplexing session.

[0015] In another possible implementation, the first transmitter device is configured to adjust its transmission power to prevent interference.

[0016] The first transmitter is used to adjust its transmission power according to the positions of the first user terminal (communicating with the second transmitter device) and the non-interfering user terminal, so as to minimize interference. For example, the first transmitter increases its transmission power in the direction towards the non-interfering user terminal, thereby improving the coverage range and signal-to-interference-plus-noise ratio level of the first transmitter. Further, the first transmitter steers the beam towards the desired direction and suppresses the transmission power in other directions, specifically the transmission power towards the direction of the first user terminal, to avoid interfering with the second transmitter device.

[0017] In another possible implementation, the first transmitter device is used to obtain position information in the form of an access angle between the first user terminal and the second transmitter device.

[0018] This access angle determines the position and orientation of the first transmitter device relative to the second transmitter device and the first user terminal. The access angle helps to determine the possible interference area / volume and direction between the first transmitter device and the second transmitter device, so that the first transmitter device can determine in which direction to increase or decrease the transmission power to avoid interference. The position information of the first user terminal determined by the access angle here is also used to determine the transmission power of the first transmitter device to prevent interference. For example, if the position of the first user terminal is close to the user terminal of the first transmitter device, the first transmitter device uses beamforming to meet the needs of the corresponding user terminal while suppressing its transmission power in the direction of the first user terminal.

[0019] In another possible implementation, the first transmitter device is used to obtain position information in the form of the position of the first user terminal.

[0020] The first transmitter device obtains the position of the first user terminal, so that the first transmitter device can adjust the direction of its own transmission power according to the position of the first user terminal to prevent interference. Further, the first transmitter device can identify the non-interfering user terminal according to the obtained position of the first user terminal.

[0021] In another possible implementation, the first transmitter device is used to obtain the position information according to the information received from the second transmitter device and / or at least one third transmitter device in the wireless network.

[0022] The third transmitter device here is used as a reference when determining the location information of the user terminal of the second transmitter device. For example, techniques such as triangulation or trilateration are used for determination. The first transmitter device can use the obtained location information to adjust its own transmission power and direction, so as to minimize the interference in the channel.

[0023] In another possible implementation, the first transmitter device is used to receive the location information from the at least one user terminal.

[0024] In some scenarios, there may be more than one user terminal communicating with the second transmitter device. For example, there are three user terminals. Each user terminal will interfere with the first transmitter device when communicating with the second transmitter device. Therefore, the first transmitter device receives the location information from each user terminal to adjust its own transmission power and direction, so as to minimize the interference in the channel.

[0025] In another possible implementation, a device is provided, such as an access point device applied in a wireless network, and the device includes a first transmitter device.

[0026] The device includes the first transmitter device, including the control unit of the first transmitter device provided in the first aspect, thus realizing all the advantages and effects of the first transmitter device in the first aspect.

[0027] In a second aspect, a method for controlling a transmitter device to transmit on a first channel in a wireless network is provided. The method includes: identifying at least one second transmitter device transmitting on the first channel in the wireless network. The method further includes: obtaining location information related to the location of at least one user terminal communicating with the second transmitter device; suppressing the transmission energy from the first transmitter device in at least a selected first direction to avoid interfering with the signals transmitted by the at least one second transmitter device.

[0028] The method in the second aspect provides a means for the control unit of the first transmitter device to control the first transmitter device, thus realizing all the advantages and effects of the first transmitter device in the first aspect.

[0029] In a possible implementation, the method includes: identifying non-interfering user terminals from the direction of the first transmitter and located in a direction different from the first direction, and controlling the first transmitter to communicate with the non-interfering user terminals.

[0030] This implementation of the second aspect realizes all the advantages and effects of the first implementation of the first aspect.

[0031] In a third aspect, a computer program product for controlling a first transmitter device is provided. The computer program product includes computer-readable instructions that, when executed in a control unit for controlling the first transmitter device, cause the transmitter device to: identify at least one second transmitter device transmitting on a first channel in the wireless network; obtain location information related to the location of at least one user terminal communicating with the second transmitter device; suppress the transmission energy from the first transmitter device in at least a selected first direction to avoid interfering with the signals transmitted by the at least one second transmitter device.

[0032] The computer program product in the third aspect provides means for controlling the first transmitter device by the control unit of the first transmitter device, thereby achieving all the advantages and effects of the first transmitter device described in the first aspect.

[0033] In a possible implementation, the computer program product further includes instructions that, when executed in the control unit, cause the transmitter device to identify non-interfering user terminals coming from the direction of the first transmitter device and located in a direction different from the first direction, and communicate with the non-interfering user terminals.

[0034] This implementation of the third aspect achieves all the advantages and effects of the first implementation of the first aspect.

[0035] In another possible implementation, a non-transitory data memory is provided, and the computer program product is stored in the non-transitory data memory.

[0036] The non-transitory data memory stores computer-readable instructions executable in the control unit of the first transmitter device.

[0037] In another possible implementation, a device applied to a wireless network is provided, including a transmitter device, and further including: a processor for controlling the transmitter device; a program memory, the program memory including a computer program product executable in the processor for controlling the transmitter device.

[0038] The device includes the program memory, which includes the computer-readable instructions executed by the processor in the control unit. The control unit is used to control the first transmitter device. The control unit in the first transmitter device can identify the second transmitter device. When the second transmitter device initiates a spatial multiplexing session in the first channel, the first transmitter device can join the spatial multiplexing session. The control unit obtains the location of the first user equipment terminal communicating with the second transmitter device. Then, the control unit adjusts the direction and intensity of the transmission energy of the first transmitter device. For example, the control unit suppresses the energy in the direction of the first user equipment to reduce interference in the channel. Additionally, by obtaining the location of the first user terminal, the first transmitter can increase its transmission power in other directions even when transmitting at a high transmission power without the risk of interference, thereby improving the total throughput of the channel.

[0039] It should be noted that all devices, elements, circuits, units, and means described in this application can be implemented in software or hardware elements, or any combination thereof. All steps performed by various entities described in this application and the functions described to be performed by various entities are intended to indicate that each entity is suitable or used to perform its respective steps and functions. Although in the description of the following specific embodiments, the specific functions or steps performed by external entities are not reflected in the description of the specific elements of the entity performing the specific steps or functions, those skilled in the art should be clear that these methods and functions can be implemented in their respective hardware or software elements, or any combination thereof. It should be understood that the features of this application are easily combined in various forms without departing from the scope of this application defined by the appended claims.

[0040] Other aspects, advantages, features, and purposes of this application are obvious from the accompanying drawings and the detailed description of the illustrative embodiments explained in conjunction with the appended claims. Brief Description of the Drawings

[0041] The above-mentioned inventive content and the following detailed description of the illustrative embodiments can be better understood in conjunction with the accompanying drawings. To illustrate this application, an exemplary structure of this application is shown in the drawings. However, this application is not limited to the specific methods and means disclosed herein. In addition, those skilled in the art should understand that the drawings are not drawn to scale. Where possible, the same elements are denoted by the same numbers.

[0042] Here, only by way of example, embodiments of this application are described in conjunction with the accompanying drawings.

[0043] Figure 1A Schematic diagram of a traditional spatial multiplexing session;

[0044] Figure 1B Schematic diagram of a traditional spatial multiplexing session using traditional beamforming transmission technology;

[0045] Figure 2 Block diagram of a wireless network provided by an embodiment of the present application;

[0046] Figure 3 Schematic diagram of a spatial multiplexing session using intelligent beamforming transmission technology provided by an embodiment of the present application;

[0047] Figure 4A and Figure 4B Schematic diagram of identifying a non-user terminal from the direction of a first transmitter device provided by an embodiment of the present application;

[0048] Figure 5 Graphical representation of comparison results of different methods for controlling a first transmitter device to transmit on a first channel provided by an embodiment of the present application;

[0049] Figure 6 Flowchart of a method for controlling a transmitter device to transmit on a first channel in a wireless network provided by an embodiment of the present application;

[0050] Figure 7 Block diagram of a device applied to a wireless network provided by an embodiment of the present application.

[0051] In the drawings, underlined numbers are used to indicate the item where the underlined number is located or the item adjacent to the underlined number. Non-underlined numbers are related to the items connected to them by lines. When a number has no underline and is associated with an arrow, the non-underlined number is used to identify the general item pointed to by the arrow. Detailed implementation

[0052] Figure 1A Shows a schematic diagram of a system 100A that implements a traditional or standard spatial multiplexing session. The system 100A implements a traditional spatial multiplexing session for sharing a channel among multiple transmitting devices using the same channel. The traditional spatial multiplexing session of the system 100A includes two adjacent transmitter devices, namely a traditional first transmitter device 102 and a traditional second transmitter device 104. The traditional first transmitter device 102 includes assigned user terminals S 21 , S 22 , S 23 to S 27 , and the traditional second transmitter device 104 includes an assigned user terminal S 11 . The traditional second transmitter device 104 initiates a standard spatial multiplexing session, and the traditional first transmitter device 102 joins the standard spatial multiplexing session to transmit to the assigned user terminals S 21 , S 22 , S 23, ……, S 27 transmits. The traditional first transmitter device 102 adjusts its transmission power to avoid interfering with the ongoing communication between the traditional second transmitter device 104 and the user terminal S 11 However, the traditional first transmitter device 102 needs to significantly reduce its transmission power to avoid interference, but this reduces the coverage area of the traditional first transmitter device 102. Thus, when the transmission power is reduced, only the user terminals S 21 and S 22 are within the coverage area of the first transmitter device 102, while the user terminals S 23 , S 24 , ……, S 27 are outside the coverage area of the first transmitter device 102. Therefore, the standard spatial multiplexing session of the system 100A allows the traditional first transmitter device 102 to transmit on the same channel only to a few allocated user terminals.

[0053] Figure 1B FIG. shows a schematic diagram of a system 100B that uses a traditional or standard blind beamforming transmission session to implement spatial multiplexing technology. The components are described herein in conjunction with Figure 1A of Figure 1B In the traditional blind beamforming transmission session implemented by the system 100B, the traditional first transmitter device 102 does not have prior position information of the user terminals of the second transmitter device 104. Referring to Figure 1B , it shows that the traditional first transmitter device 102 joins the traditional blind beamforming transmission session and transmits to the allocated user terminals S 21 , S 22 , S 23 to S 27 . Thus, in the blind beamforming transmission session, only the user terminals S 21 , S 22 and S 26 are within the coverage area of the first transmitter device 102, while the user terminals S 23 , S 24 , S 25 and S 27 are outside the coverage area of the traditional first transmitter device 102. Since the first transmitter device 102 does not have prior position information of the user terminals of the traditional second transmitter device 104, the power cannot be steered to the user terminals S 23 , S 24 , S 25 and S 27 . Further, in the absence of prior position information of the user terminal S 11 of the traditional second transmitter device 104, the traditional first transmitter device 102 for the user terminal S11 There is a relatively high risk of interference.

[0054] Embodiments of the present invention and their implementation manners are described in detail below. Although some manners of implementing the present invention have been disclosed, those skilled in the art should recognize that other embodiments of implementing or practicing the present invention are also possible.

[0055] Figure 2 FIG. 200 is a block diagram of a system 200, which represents a wireless network, and these two terms are used interchangeably herein. This wireless network 200 relates to a set of interconnected programmable and / or non-programmable components that are available or known at the time of filing the application, or are developed later, for facilitating data communication between one or more electronic devices. The wireless network 200 may include, but is not limited to, cellular networks (e.g., 2G, 3G, long-term evolution (LTE) 4G, 5G, or 5G NR networks, such as sub 6GHz, cmWave, or mmWave communication networks), one or more peer-to-peer networks, hybrid peer-to-peer networks, local area networks (LANs), radio access networks (RANs), metropolitan area networks (MANs), wide area networks (WANs), all or part of a public network, such as the global computer network known as the Internet, private networks, cellular networks, and any other communication systems located at one or more locations. In addition, the wireless network 200 may be implemented based on any number of known protocols, including but not limited to Internet Protocol (IP), Wireless Access Protocol (WAP), Frame Relay, or Asynchronous Transfer Mode (ATM). In addition, any other suitable protocol using voice, video, data, or a combination thereof may also be employed. In addition, although the wireless network 200 described herein is often described as being implemented through the TCP / IP communication protocol, the wireless network 200 may also be implemented through IPX, Appletalk, IP-6, NetBIOS, OSI, any tunneling protocol (e.g., IPsec, SSH), or any number of existing or future protocols.

[0056] According to an embodiment of the present invention, the wireless network 200 includes a first transmitter device 202 for transmitting on a first channel 204. The wireless network 200 further includes a second transmitter device 206, which also transmits on the first channel 204. The first transmitter device 202 and the second transmitter device 206 relate to electronic devices associated with (or used by) a user and capable of enabling the user to perform specific tasks. In addition, the first transmitter device 202 and the second transmitter device 206 are intended to be construed broadly to include any electronic device that can be used for voice and / or data communication through a wireless communication network. Examples of the first transmitter device 202 and the second transmitter device 206 include, but are not limited to, routers, modems, smartphones, tablets, laptops, wireless network cards, cellular phones, personal digital assistants (PDAs), handheld devices, wireless modems, laptop computers, personal computers, etc. In addition, the first transmitter device 202 and the second transmitter device 206 may include a housing, a memory, a processor, a network interface card, a microphone, a speaker, a keyboard, and a display. In addition, the first transmitter device 202 and the second transmitter device 206 are construed broadly to cover various different types of mobile stations, user stations, or more general communication devices, including combinations such as a data card inserted into a laptop. These communication devices are also intended to cover devices commonly referred to as "access terminals".

[0057] The first transmitter device 202 and the second transmitter device 206 may transmit on the first channel 204 using wireless communication protocols, communication standards, and technologies, including but not limited to IEEE 802.11, 802.15, 802.16, 1609, Worldwide Interoperability for Microwave Access (WiMAX), Transmission Control Protocol and Internet Protocol (TCP / IP), User Datagram Protocol (UDP), Hypertext Transfer Protocol (HTTP), Long-Term Evolution (LTE), File Transfer Protocol (FTP), Enhanced Data GSM Environment (EDGE), Voice over Internet Protocol (VoIP), protocols for email, instant messaging, and / or Short Message Service (SMS), and / or other cellular or Internet of Things communication protocols.

[0058] The first transmitter device 202 includes a control unit 208 for identifying at least one second transmitter device 206 that transmits on the first channel 204 in the wireless network 200. Here, the control unit 208 refers to a structure and / or module including programmable and / or non-programmable components for storing, processing, and / or sharing information. Optionally, the control unit 208 includes any arrangement of physical or virtual computing entities capable of optimizing information to perform various computing tasks. Further, it should be understood that the control unit 208 can be a single hardware server and / or multiple hardware servers operating in a parallel or distributed architecture. In one example, the control unit 208 may include components such as a memory, a processor, a network adapter, etc. to store, process, and / or share information with other computing components such as user devices. Optionally, the control unit 208 is implemented as a computer program that provides various services (such as database services) to other devices, modules, or apparatuses. The control unit 208 identifies the at least one second transmitter device 206 that is transmitting in the first channel 206, so that in the case of multiple users, the first transmitter device 202 can share the first channel 206 with the second transmitter device 206, providing a consistent and reliable data stream for more users.

[0059] According to one embodiment, the first transmitter device 202 is configured to identify the at least one second transmitter device 206 when the second transmitter device 206 initiates a spatial multiplexing session. A spatial multiplexing session allows sharing of a channel between two or more transmitter devices using the 802.11 spatial multiplexing framework. The basic service set (BSS) coloring mechanism enables a user to distinguish transmissions in its channel or in the channel of the second transmitter device 206, i.e., the first channel 204. When a user actively listening to the channel detects a wireless frame, the user checks the initiator ID (e.g., the BSS coloring bit). If the initiator is the same as the associated transmitter device, e.g., the first transmitter device 202, the user considers the frame to be an in-BSS frame. However, if the detected frame has an initiator indication with a different BSS color from the user's, the user considers the frame to come from an overlapping BSS and is an inter-BSS frame. Thus, the coloring mechanism enables a user to distinguish transmissions in its channel or in the first channel 204 of the second transmitter device 206. Further, the control unit 208 of the first transmitter device 202 may verify the first channel 204 of the second transmitter device 206 before initiating a spatial multiplexing session. Optionally, more than one transmitter device may initiate a spatial multiplexing session. However, the control unit 208 identifies any transmitter device of the spatial multiplexing session.

[0060] The control unit 208 is further configured to obtain location information related to the location of the first user terminal communicating with the second transmitter device 206. The first user terminal may be a user device that communicates with the second transmitter device 206 via the first channel 204. Additionally, the first user terminal may also be referred to as a mobile station, mobile terminal, user station, remote station, terminal, user unit, etc. The control unit 208 obtains the location of the first user terminal so as to reduce interference between the first transmitter device 202 and the first user terminal when the first transmitter device 202 transmits a signal on the first channel 204 of the second transmitter device 206.

[0061] According to one embodiment, the first transmitter device 202 is configured to obtain the location information based on information received from the second transmitter device and / or at least one third transmitter device in the wireless network 200, where the third transmitter device serves as a reference when measuring the location of the first user terminal from the second transmitter device 206. For this purpose, the first transmitter device 202 may employ any known technique, such as: triangulation or trilateration. For example, in trilateration, the first transmitter device 202 measures the distance between the first user terminal and the second transmitter device 206 by simply finding the intersection point of three circles and / or three spheres.

[0062] According to one embodiment, the first transmitter device 202 is configured to obtain location information in the form of an angle of access between the first user terminal and the second transmitter device 206. The first transmitter device 202 obtains the location information between the first terminal and the second transmitter device 206 to reduce interference. Angle-of-access technology (also known as direction of arrival) determines the location information between the first user terminal and the second transmitter device 206 by determining the angle of access (also known as the angle of incidence) at which the signal arrives at the first user terminal. When estimating the location of the first user terminal, in addition to the second transmitter device 206, it may be necessary to rely on the third transmitter device to achieve higher accuracy. Techniques for determining the angle of access may be employed, and these techniques may include, but are not limited to, maximum likelihood techniques, Capon spectral beamforming, and multiple signal classification (MUSIC) techniques.

[0063] According to an embodiment, the first transmitter device 202 is configured to obtain location information in the form of the location of the first user terminal. The first transmitter device 202 obtains the location information of the first user terminal to reduce interference between the first transmitter device 202 and the first user terminal. The location of the first user terminal can be obtained in Cartesian coordinates. For example, the location information of the first user terminal is calculated in location coordinates defined by three axes (x-axis, y-axis, and z-axis). The location of the first user terminal can be determined by using the access angle through geometric relationships starting from the intersection point of two bearing lines respectively formed by the second transmitter device 206 and the third transmitter device.

[0064] Optionally, the location information of the first user terminal can be determined by received signal strength indicator (RSSI) information. RSSI helps estimate the power level degree received by the first user terminal from the second transmitter device 206. The greater the distance, the lower the power level estimated by RSSI; the smaller the distance, the higher the estimated power level. Therefore, the power level calculated by RSSI provides the location information of the first user terminal relative to the second transmitter device 206. Optionally, the location information of the first user terminal can be determined according to the fine timing measurement (FTM) protocol. The FTM protocol helps measure the distance between the first user terminal and the second transmitter device 206 based on the round-trip time (RTT) of wireless data packets. Optionally, the location information of the first user terminal can be determined by the difference in time of arrival (DTOA). The difference in time of arrival is an electronic technology for direction finding and navigation, which calculates the arrival time of signals from the second transmitter device 206 at the first user terminal with an accurate synchronous time reference and physically separated. Optionally, if the first transmitter device 202 is equipped with smart antennas (each antenna turns to another quarter area), the smart antennas can decide in which quarter area to schedule to determine the possible transmission direction. In this case, for simplicity, accurate calculations for the first user device can be avoided. Optionally, if there are more than two transmitter devices transmitting on the first channel 204, each transmitter device can share the location information of its respective user terminal with each other to ensure that the user terminals corresponding to each transmitter device do not cause interference to the first channel 204. It can be understood that the technologies discussed are well known in the art and are not described in detail here for the sake of brevity. In addition, it can be understood that other similar technologies can be implemented for the purpose without departing from the scope and spirit of the present application.

[0065] According to one embodiment, the first transmitter device 202 is configured to receive the location information from the at least one user terminal. It can be understood that each user terminal interferes with the first transmitter device 202 when communicating with the second transmitter device 206. Therefore, the first transmitter device 202 receives the location information from each user terminal to adjust its own transmission power and direction, so as to minimize the interference in the first channel 204. In an exemplary scenario, the second transmitter device 206 may have more than one user terminal transmitting on the first channel 204. For example, the second transmitter device 206 may have three user terminals transmitting on the first channel 204. Then, the first transmitter device 202 may receive the location information from the more than one user terminal to improve accuracy and reduce interference. Optionally, the first transmitter device 202 may share the location information of its corresponding user terminal with the second transmitter device 206 to further reduce the chance of interference.

[0066] The control unit 208 of the first transmitter device 202 is further configured to suppress the transmission energy from the first transmitter device 202 in at least a selected first direction to avoid interfering with the signals transmitted by the at least one second transmitter device 206. In combination with the present application, the "first direction" refers to the direction towards the first user terminal of the second transmitter device 206. Since the first transmitter device 202 has the prior location information of the first user terminal of the second transmitter device 206, the controller 208 can suppress the transmission energy from the first transmitter device 202 and towards the direction of the first user terminal to avoid interference between the first user terminal and the first transmitter device 202. The control unit 208 uses intelligent beamforming technology to suppress the transmission energy from the first transmitter device 202. The intelligent beamforming technology herein provides spatial selectivity, which allows the first transmitter device 202 to direct the transmission energy to the desired direction and uses multiple-input multiple-output antennas to suppress the transmission energy in other directions to prevent interference. This technology is well known in the art. For the sake of brevity, it is not described in detail here.

[0067] Optionally, there may be multiple user terminals associated with the second transmitter device 206. In this case, the first transmitter device 202 may suppress the transmission energy towards all user terminals associated with the second transmitter device 206 to reduce the likelihood of interference. Optionally, there may be multiple transmitter devices transmitting on the first channel 204. For example, it may be the fourth transmitter device communicating on the first channel 204 in the wireless network 100. At this time, in addition to suppressing the transmission energy towards the assigned user terminals of the second transmitter device 206 as described above, the first transmitter device 202 may also suppress the transmission energy towards the assigned user terminals of the fourth transmitter device.

[0068] Figure 3 FIG. 4 is a schematic diagram of the system 300 provided by an embodiment of the present application. This system represents a wireless network, and these two terms can be used interchangeably in this article. The system 300 uses the intelligent beamforming transmission session 300 to implement the spatial multiplexing technology. In the wireless network 300 that implements intelligent beamforming transmission, the first transmitter device 202 has the prior position information of the first user terminal of the second transmitter device 206. Refer to Figure 3 , according to an embodiment of the present application, the first transmitter device 202 joins the intelligent beamforming transmission session in the wireless network 300 to transmit to the assigned user terminals S 21 、S 22 、S 23 to S 27 . Here, the first transmitter device 202 suppresses the transmission energy in the directions of user terminals S 25 and S 27 to prevent interference to S 11 (assigned to the second transmitter device 206). Therefore, compared with the traditional blind spatial multiplexing session of system 100A and the traditional blind beamforming transmission session of system 100B, when using the intelligent beamforming transmission of system 300, the assigned user terminals of the first transmitter device 202 increase with the reduction of interference.

[0069] According to an embodiment, the control unit 208 is used to identify non-interfering user terminals coming from the direction of the first transmitter device 202 and located in a direction different from the first direction, and control the first transmitter device 202 to communicate with the non-interfering user terminals. Among them, the non-interfering user terminals are the assigned user terminals of the first transmitter device 202 and do not interfere with the communication between the first user terminal and the second transmitter device 206 on the first channel 204. Optionally, the control unit 208 may identify the non-interfering user terminals through the 802.11k protocol, 802.11r protocol, 802.11v protocol, or a combination thereof. Refer toFigure 3 , the non-interfering user terminal includes S 21 , S 22 , S 23 , S 24 and S 26 . Further, the control unit 208 suppresses the transmission energy towards the interfering user terminals S 25 and S 27 to avoid interference. Therefore, the control unit 208 can identify the non-interfering user terminals of the first transmitter device 202 and communicate with them to increase the user terminals associated with the first transmitter device 202 while minimizing the total interference in the first channel 204.

[0070] According to one embodiment, the first transmitter device 202 is used to adjust its own transmission power to prevent interference. As discussed above, since the first transmitter device 202 can identify the non-interfering user terminals according to the prior position information of the first user terminals of the second transmitter device 204, the first transmitter device 202 can adjust its own transmission power according to the positions of the non-interfering user terminals to minimize interference. For example, in Figure 3 's example, the first transmitter device 202 can direct a higher transmission power to the user terminals S 23 , S 24 and S 26 that are not located near the first transmitter device 202. The first transmitter device 202 can implement intelligent beamforming technology to direct the power to the non-interfering user terminals, which enables the first transmitter device 202 to increase its own transmission power without interfering with adjacent terminals associated with the second transmitter device 206. The higher transmission power from the first transmitter device 202 increases the signal-to-interference-plus-noise ratio of the non-interfering user terminals. In addition, adjusting the transmission power greatly increases the probability of discovering non-interfering user terminals, thereby increasing the user terminals allocated to the first transmitter device 202 and further increasing the cell radius of the first transmitter device 202. In one example, when the transmission power of the first transmitter device 202 is increased by 3 dB, the probability of discovering non-interfering user terminals can be doubled.

[0071] According to one embodiment, a device is provided, such as an access point device applied in a wireless network, and the device includes the first transmitter device 202. Examples of the device include, but are not limited to, internet-of-things (IoT) devices, smartphones, machine type communication (MTC) devices, computing devices, evolved universal mobile telecommunications system (UMTS) terrestrial radio access (E-UTRAN) NR-dualconnectivity (EN-DC) devices, servers, IoT controllers, drones, wireless communication custom hardware, transmitters, or any other portable or non-portable electronic devices. The device may include the first transmitter device 202 in the form of hardware such as a smart chip.

[0072] Figure 4A Schematic diagram of the wireless network 300 provided by the embodiment of the present application. The wireless network 300 is used to identify non-user terminals from the direction of the first transmitter device 202. Here, the second transmitter device 206 may initiate a spatial multiplexing session and transmit to the user terminal S 11 Further, the first transmitter device 202 joins the spatial multiplexing session initiated by the second transmitter device 206, selects non-interfering user terminals by adjusting the transmission direction, and minimizes the interference at the user terminal S 11 In order to identify non-user terminals from the direction of the first transmitter device 202, the control unit 208 acquires the access angle of the user terminal S 11 (denoted as θ 11 ) and calculates the access angle of the user terminal S 23 (denoted as θ 23 ). Further, the control unit 208 acquires the access angle accuracy of the second transmitter device 206 (denoted as Δθ1) to determine the coverage area of the user terminal S 11 . The coverage area of the user terminal S 11 is the area in the first channel 204 that may interfere with the user terminal S 23 . The coverage area of the user terminal S 11 is represented by the sector lines l 11 and l 12 . In addition, the control unit 208 calculates the access angle accuracy of the first transmitter device 202 (denoted as Δθ2) to determine the coverage area of the user terminal S 23 . The coverage area of the user terminal S23 The coverage area is the area in the first channel 204 that may interfere with the user terminal S 11 and other user terminals transmitting in the first channel 204. The coverage area of the user terminal S 23 is represented by the sector lines l 21 and l 23 The control unit 208 searches for the sector lines l 11 and l 11 of the user terminal S 12 and selects non-interfering user terminals S 11 outside the coverage area of the user terminal S 23 . Further, the control unit 208 calculates the transmission power of the first transmitter device 202 according to the coverage area with the least interference to the user terminal S 11 . Here, the first transmitter device 202 implements beamforming technology to transmit data to S 23 .

[0073] Figure 4B FIG. is a schematic diagram of the wireless network 300 provided by the embodiment of the present application. The wireless network 300 identifies non-user terminals from the direction of the first transmitter device 202 through smart antennas. Here, the user terminal S 23 is equipped with a smart antenna. In the example, the smart antenna is designed to select a beam for transmission according to a selected quarter area through a hardware switch. Therefore, for simplicity, the smart antenna calculates the desired transmission direction without the precise position information of the user terminal without the second transmitter device 206. Refer to Figure 4B , as shown in the figure, the quarter areas 402A and 402B are the areas in the first channel 204 that do not interfere with the user terminal S 11 . Further, the quarter area 404 is the area in the first channel 204 that interferes with the user terminal S 11 . This information can be determined by the smart antenna without knowing the precise position of the user terminal S 11 .

[0074] Figure 5 FIG. shows a simulation comparison curve graph 500 between the traditional spatial multiplexing technology, that is, the spatial multiplexing technology using traditional beamforming technology, and the spatial multiplexing technology using smart beamforming technology provided by the embodiment of the present application. Here, in combination with Figure 1A , Figure 1B and Figure 3 the elements in Figure 5 are described. As Figure 5 shown, here the first case represents that the traditional first transmitter device 102 passes through the traditional spatial multiplexing session 100A in Figure 1Atransmission is performed in the system 100A shown; the second case indicates that the conventional first transmitter device 102 performs transmission in the Figure 1B system 100B shown by adopting the spatial multiplexing technology of the conventional beamforming session. Further, the third case here indicates that the first transmitter device 202 performs transmission in the Figure 2 and Figure 3 system 200 and / or the wireless network 300 shown by adopting the spatial multiplexing technology of the intelligent beamforming transmission session 300 provided by one or more embodiments of the present application. Further, referring to Figure 5 , the X-axis 502A represents the number of user terminals involved when the first transmitter device 102 and the first transmitter device 202 perform transmission on the first channel 204 in each case (a total of 15 user terminals in each case); the Y-axis 502B represents the total throughput of the conventional first transmitter device 102 and the first transmitter device 202. It can be seen from the Figure 5 curve graph 500 that the curve 504 represents the total throughput of user terminals (unit: MBps) with respect to the number of user terminals involved when the first transmitter device 102 and the first transmitter device 202 perform transmission on the first channel 204 in each of the first case, the second case, and the third case.

[0075] Referring to the first case, the first transmitter device 102 involves a total of 3 user terminals sharing the channel, and the total throughput is 23 MBps. Further, referring to the second case, the first transmitter device 102 involves a total of 5 user terminals sharing the channel, and the total throughput is 24 MBps. Although in the second case, the number of user terminals of the conventional first transmitter device 102 performing transmission on the same channel slightly increases, the total throughput does not increase significantly. However, referring to the third case, the first transmitter device 202 involves a total of 8 user terminals sharing the channel, and the total throughput is about 27 MBps. For the third case, by adopting the spatial multiplexing technology of the intelligent beamforming transmission session, the number of user terminals of the first transmitting device 202 performing transmission on the first channel almost triples (from 3 user terminals in the first case to 8 user terminals in the third case), and the total throughput increases by about 20% (from 23 MBps in the first case to 27 MBps in the third case). Therefore, according to the embodiments of the present application, the intelligent beamforming transmission session helps to significantly increase the user terminals involved in the first transmitter device 202, and at the same time also improves the total throughput of the channels used.

[0076] Figure 6Flowchart of method 600 for controlling a transmitter device to transmit on a first channel in a wireless network provided by an embodiment of the present application. The above-described embodiments and their variants are applicable, with necessary modifications, to the method for controlling a transmitter device in the present application. In this embodiment, method 600 may be executed by a control unit (such as Figure 2 the control unit 208 described in

[0077] Step 602, identify at least one second transmitter. The control unit 208 of the first transmitter device 202 is configured to identify the at least one second transmitter 206 that transmits on the first channel 206 in the wireless network 200. Techniques and examples for identifying at least one second transmitter device 206 are described in detail in, for example Figure 2 , Figure 3 , Figure 4A and Figure 4B . For the sake of brevity, they are not repeated here.

[0078] Step 604, obtain location information related to the location of at least one user terminal communicating with the second transmitter device 206. Techniques and examples for obtaining location information related to the location of at least one user terminal communicating with the second transmitter device 206 are described in detail in, for example Figure 2 , Figure 3 , and Figure 4A . For the sake of brevity, they are not repeated here.

[0079] Step 606, suppress the transmission energy from the first transmitter device 202 in at least a selected first direction to avoid interfering with the signals transmitted by the at least one second transmitter device 206. Techniques and examples for suppressing the transmission energy from the first transmitter device 202 are described in detail in, for example Figure 2 , Figure 3 , and Figure 4A . For the sake of brevity, they are not repeated here.

[0080] According to one embodiment, method 600 further includes the following steps: identify non-interfering user terminals from the direction of the first transmitter and located in a direction different from the first direction, and control the first transmitter to communicate with the non-interfering user terminals. Techniques and examples for identifying non-interfering user terminals are described in detail in, for example Figure 3 , Figure 4A and Figure 4B . For the sake of brevity, they are not repeated here.

[0081] Steps 602 to 606 are merely exemplary, and other alternatives may be provided without departing from the scope of the claims of the present application, including adding one or more steps, removing one or more steps, or providing one or more steps in a different order.

[0082] A computer program product for controlling a first transmitter device 202 is provided. The computer program product includes computer-readable instructions that, when executed in a control unit 208 for controlling the first transmitter device 202, cause the transmitter device to: identify at least one second transmitter device 206 transmitting on a first channel 204 in a wireless network 200; obtain location information related to the location of at least one user terminal communicating with the second transmitter device 206; and suppress transmission energy from the first transmitter device 202 in at least a selected first direction to avoid interfering with signals transmitted by the at least one second transmitter device 206. The computer program product may include suitable logic, circuitry, and / or interfaces for storing machine code and / or instructions executable by the control circuitry 202 (e.g., a processor). Examples of implementations of the computer program product may include, but are not limited to, electrically erasable programmable read-only memory (EEPROM), random access memory (RAM), read-only memory (ROM), hard disk drive (HDD), flash memory, secure digital (SD) card, solid-state drive (SSD), computer-readable storage medium, and / or CPU cache. The computer program product may store an operating system and / or a computer program product to operate the first transmitter device 202. The computer-readable storage medium for providing the computer program product may include, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof.

[0083] According to an embodiment, the computer program product further includes instructions that, when executed in the control unit 208, cause the first transmitter device 202 to identify a non-interfering user terminal from the first transmitter direction and located in a direction different from the first direction, and to communicate with the non-interfering user terminal. Techniques and examples for identifying non-interfering user terminals, for example, Figure 3 , Figure 4A and Figure 4BIt has been described in detail in []. For the sake of brevity, it will not be repeated here.

[0084] According to one embodiment, a non-transitory data memory is provided, in which the computer program is stored. The data memory may include suitable logic, circuitry, and / or interfaces for storing machine code and / or instructions having at least one code segment executable by the control unit 208. Examples of implementations of the data memory may include, but are not limited to, electrically erasable programmable read-only memory (EEPROM), random access memory (RAM), read-only memory (ROM), hard disk drive (HDD), flash memory, secure digital (SD) card, solid-state drive (SSD), and / or CPU cache. The data memory may store an operating system and / or other program products to operate the first transmitter device 202. Computer-readable storage media for providing the non-transitory data memory may include, but are not limited to, electronic storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing.

[0085] Figure 7Block diagram of device 700 applied to a wireless network provided by an embodiment of the present application. According to one embodiment, the device 700 applied to a wireless network includes a transmitter device 702 (such as the first transmitter device 202). The device 700 refers to an input-output device that can receive input from a user and provide output to the user. The device 700 can be communicatively coupled to the control unit 208. Examples of input devices can include, but are not limited to, touchscreens, such as touchscreens of display devices, microphones, motion sensors, light sensors, dedicated hardware input units (such as buttons), and docking stations. Examples of output devices include display devices and speakers. Examples of the display device include, but are not limited to, in-vehicle displays (such as head-up displays (HUDs), augmented reality systems (AR-HUDs), display screens of driver information consoles (DICs), infotainment units, or head units (HUs)), non-vehicle displays, such as smart glass displays, display screens of portable devices, or other display screens. The device 700 includes the transmitter device 702, and examples of the transmitter device 702 are the same as those of the first transmitter device 202, and the transmitter device 702 is used to transmit a signal on the first channel 204. The device 700 further includes a processor 704 for controlling the transmitter device 702. Here, the processor 704 can generally be the same as the control unit 208 and perform similar functions. The device 700 further includes a program memory 706, which includes a computer program product 708 such that the computer program product 708 can be executed in the processor 704 to control the transmitter device 702. The program memory 706 can be the same as the above-mentioned non-transitory data memory. The techniques and examples for controlling the transmitter device 702 are similar to those of the first transmitter device 202 already described in detail in, for example Figure 2 , Figure 3 , Figure 4A and Figure 4B . Therefore, for the sake of brevity, they will not be elaborated here.

[0086] The above embodiments of the present application may be modified without departing from the scope of the present application as defined by the appended claims. Expressions such as "comprising", "including", "containing", "having", "being", etc. used to describe and claim the present application are intended to be interpreted in a non-exclusive manner, that is: the presence of items, components or elements not expressly described is permitted. References to the singular should also be construed as relating to the plural. The word "exemplary" used herein means "serving as an example, instance, or illustration". Any "exemplary" embodiment is not necessarily to be understood as being preferred over or superior to other embodiments, and / or does not exclude combinations of features of other embodiments. The word "optionally" used herein means "provided in some embodiments and not provided in other embodiments". A single embodiment may also provide combinations of certain features, which are briefly described in the context of the respective embodiments. Conversely, the various features of the invention described in the context of a single embodiment for the sake of brevity may also be provided individually or in any suitable combination or as any suitable other embodiment of the invention.

Claims

1. A first transmitter device (202), characterized in that, Applied in a wireless network (200) for transmitting a signal on a first channel (204), the first transmitter device (202) includes a control unit (208) for: · Identifying at least one second transmitter device (206) that transmits on the first channel (204) in the wireless network (200); · Obtaining position information in the form of an angle of access between a first user terminal and the second transmitter device (206); · Suppressing the transmission energy from the first transmitter device (202) in at least a selected first direction to avoid interfering with the signal transmitted by the at least one second transmitter device (206).

2. The first transmitter device (202) according to claim 1, characterized in that, The control unit (208) is used to identify a non-interfering user terminal in the direction from the first transmitter device (202) and located in a direction different from the first direction, and control the first transmitter device (202) to communicate with the non-interfering user terminal.

3. The first transmitter device (202) according to claim 1 or 2, characterized in that, For identifying the at least one second transmitter device (206) when the second transmitter device (206) initiates a spatial multiplexing session.

4. The first transmitter device (202) according to claim 1 or 2, characterized in that, For adjusting its transmission power to prevent interference.

5. The first transmitter device (202) according to claim 1 or 2, characterized in that, For obtaining position information in the form of the position of the first user terminal.

6. The first transmitter device (202) according to claim 1 or 2, characterized in that, For obtaining the position information according to the information received from the second transmitter device (206) and / or at least one third transmitter device in the wireless network (200).

7. The first transmitter device (202) according to claim 3, characterized in that, For receiving the position information from at least one user terminal.

8. An apparatus for an access point device in a wireless network (200), characterized in that, The device includes the first transmitter device (202) according to any one of claims 1-7.

9. A method (600) for controlling a first transmitter device (202) to transmit on a first channel (204) in a wireless network (200), characterized in that, The method includes the following steps: · Identifying at least one second transmitter device (206) that transmits on the first channel (204) in the wireless network (200); · Obtaining position information in the form of an angle of access between at least one user terminal and the second transmitter device (206); · Suppressing the transmission energy from the first transmitter device (202) in at least a selected first direction to avoid interfering with the signal transmitted by the at least one second transmitter device (206).

10. The method (600) according to claim 9, characterized in that, Including the steps of: identifying a non-interfering user terminal in the direction from the first transmitter device and located in a direction different from the first direction, and controlling the first transmitter device (202) to communicate with the non-interfering user terminal.

11. A computer program product (708) for controlling a first transmitter device (202), characterized in that, The computer program product (708) includes computer-readable instructions that, when executed in a control unit (208) for controlling the first transmitter device (202), cause the first transmitter device to: · Identify at least one second transmitter device (206) that transmits on a first channel (204) in a wireless network (200); · Obtain position information in the form of an angle of access between at least one user terminal and the second transmitter device (206); · Suppress the transmission energy from the first transmitter device (202) in at least a selected first direction to avoid interfering with the signal transmitted by the at least one second transmitter device (206).

12. The computer program product (708) according to claim 11, characterized in that, Further included is an instruction which, when executed in the control unit (208), causes the first transmitter device to identify a non-interfering user terminal coming from the direction of the first transmitter device (202) and located in a direction different from the first direction, and communicate with the non-interfering user terminal.

13. A non-transitory data memory, characterized in that, The non-transitory data memory stores the computer program product (708) as claimed in claim 11 or 12.

14. A device (700) applied to a wireless network (200), characterized in that, Comprising a transmitter device (702), further comprising a processor (704) for controlling the transmitter device (702), and a program memory (706), the program memory (706) comprising the computer program product (708) as claimed in claim 11 or 12, which can be executed in the processor (704) to control the transmitter device (702).

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