TWI604748B - Multi-system coexistence wireless access method - Google Patents

Description

Wireless access method for multi-system coexistence

The present invention relates to a wireless access method for wireless channels, and more particularly to a wireless access method for coexistence of multiple systems.

The Global System for Mobile Communications Systems surveyed the number of LTE users worldwide in 2014. The number of LTE users is about 400 million, and 3G users are accelerating toward LTE, making rapid changes in the ICT industry, especially with the advancement of the times. Mobile video services have greatly increased the growth of wireless network data traffic, such as You Tube, Netflix and other audio and video services to promote the growth of video and audio streaming, while the screen is facing a large scale, high resolution, and more load on the wireless network, making Wireless channel resources have gradually become less popular.

Therefore, European and American countries have begun to introduce LTE (incoming LTE-U), Licensed Assisted Access (LAA), and Licensed Shared Access (LSA) to take advantage of Unlicensed channels (eg 5 GHz) to increase the available wireless channel resources.

At present, the 5GHz unlicensed bands have different bandwidths depending on the national plan, which is about 600MHz~1+GHz. It is not easy to find such a large available bandwidth in the licensed bands. In addition to the advantages of large bandwidth, 5GHz Unlicensed bands also provide low cost of network construction (especially on the wireless side), which can significantly reduce the cost of wireless communication for users; however, there are currently two systems operating at 5 GHz unlicensed bands (IEEE 802.11a/ac, weather radar) In the future, there will be next-generation WiFi (IEEE 802.11ax) operation. The simultaneous existence of these multiple systems will cause interference. In the past, the 3G/4G network was designed to operate on licensed bands, and there is no uncontrollable interference problem. However, in multi-system channels, interference and conflict will be foreseeable issues.

Therefore, at present, the industry needs to develop a wireless access method with multiple systems coexisting, which can eliminate interference and conflict. In this way, efficiency and transmission quality can be simultaneously combined, and the wireless channel resources coexisting in multiple systems are selected. An efficient wireless access method to complete the transmission of data.

In view of the above-mentioned shortcomings of the prior art, the main purpose of the present invention is to provide a wireless access method for coexistence of multiple systems, integrating a first communication terminal, a second communication terminal, a channel condition estimation, a interference probability value, and a Threshold value, etc., to determine that in the spectrum of multi-system coexistence, an efficient wireless access method is selected to complete the data transmission.

In order to achieve the above object, according to one aspect of the present invention, a wireless access method for coexistence of multiple systems is provided, the steps comprising: (A) performing a complex channel condition estimation on a first communication terminal; (B) The multi-channel condition estimation obtains a interference probability value; (C) if the interference probability value is greater than a threshold value, the first communication end notifies a second communication end to perform a random access type wireless connection And adopting the random access wireless access method to transmit a data to the second communication end; (D) if the interference probability value is less than the critical value, the first communication end notifies the second communication end Performing a wireless access mode for resource allocation scheduling, and transmitting the data to the second communication end by using the wireless access mode of the resource allocation schedule.

The first communication terminal may be a base station, and the second communication terminal may be a mobile station, such as a mobile phone, a tablet computer or other mobile device; in step (A), the plurality of channel status estimation is a clean channel evaluation. (clear channel assessment, CCA), the first communication end (base station) must perform channel detection on the radio resources (multiple wireless channels) to be transmitted before transmission to identify whether there is interference, and the channel estimation method can Is to use simple energy detection (detecting energy on wireless resources), or to receive signals and interpret whether the received signal is an interference signal, etc., to determine the interference probability value of the complex channel condition. The interference probability value can be combined with the threshold value to perform multi-system coexistence in the channel, and the selection method is selected, wherein the threshold value can be set to , M represents the number of values of the complex channel.

The radio resource in the present invention may be a radio resource in time (the transmitting end may transmit in a certain period of time), or a radio resource in the frequency (the transmitting end may transmit in a certain frequency band), and the radio resource allocation scheduling may be based on interference. The probability value is greater than or less than the threshold value to determine the access method (the way of receiving or accessing data); in the invention of the present invention, the wireless access method of the resource allocation schedule Means that a base station of a communication system allocates certain specific radio resources to be transmitted by a specific transmitting end, and these radio resources are only designed to be used by the specific transmitting end, and other transmitting ends belonging to the communication system are not used and are not allocated to themselves. Radio access; random access wireless access means that a communication system does not allocate certain radio resources to a specific transmission end for dedicated transmission, and any transmission terminal belonging to the communication system can independently select radio resources for transmission. Or, some specific radio resources are allocated to more than one transmitting end, and the transmitting end can independently select a part of these specific radio resources for transmission; the foregoing transmission may be downlink data transmission by the base station to transmit data to the mobile station.

In order to achieve the above object, according to another aspect of the present invention, a wireless access method for coexistence of multiple systems is provided, the steps comprising: (A) a first communication terminal performing a plurality of channel condition estimation; (B) The multi-channel condition estimation obtains a jam probability value; (C) if the jam probability value is greater than a threshold value, the first communication end notifies a second communication end to perform a random access type wireless access mode, the second The communication terminal transmits the data to the first communication end by using the random access wireless access method; (D) if the interference probability value is less than the threshold value, the first communication end notifies the second communication end to perform a The wireless access mode of the resource allocation schedule, the second communication end transmits the data to the first communication end by using the wireless access mode of the resource allocation schedule.

The first communication terminal may be a base station, and the second communication terminal may be a mobile station, such as a mobile phone, a tablet computer or other mobile device; in step (A), the plurality of channel status estimation is a clean channel evaluation. (clear Channel assessment, CCA); The wireless resource of the present invention may be a radio resource in time (the transmitting end may transmit in a certain period of time), or a radio resource in the frequency (the transmitting end may transmit in a certain frequency band), and the radio resources are used. The allocation schedule may determine the access method (the manner of receiving or accessing data) according to the interference probability value being greater or less than the threshold value; in the invention, the wireless access method of the resource allocation schedule means a base station of a communication system. Allocating certain specific radio resources to be transmitted with a specific transmitting end, and these radio resources are only designed to be used by the specific transmitting end, and other transmitting terminals belonging to the communication system do not use radio resources that are not allocated to themselves; random access type The wireless access method means that a communication system does not allocate certain radio resources for dedicated transmission to a specific transmitting end, and any transmitting end belonging to the communication system can independently select a wireless resource for transmission, or some specific radio resources. Assigned to more than one transmitter, and these transmitters can independently select some of these specific Resource transfer; the transfer, a mobile station may transmit data to the base station uplink data transmission.

The above summary and the following detailed description and drawings are intended to further illustrate the manner, means and effects of the present invention in achieving its intended purpose. Other purposes and advantages of this creation will be explained in the following description and drawings.

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The first figure is a flowchart of a wireless access method for coexistence of multiple systems according to the present invention; The second figure is a flow chart of another wireless access method for coexistence of multiple systems according to the present invention.

The embodiments of the present invention are described by way of specific examples, and those skilled in the art can readily understand the advantages and effects of the present invention from the disclosure of the present disclosure.

The wireless communication system is a multi-channel system comprising at least one base station and a plurality of mobile stations (such as mobile phones, tablets or other mobile devices), and the data transmission between the base station and the mobile station is transmitted in the form of a packet; The 5GHz unlicensed bands have a bandwidth of about 600MHz~1+GHz, which is an unlicensed band. Currently, two systems operate on 5GHz unlicensed bands (IEEE 802.11a/ac, weather radar), and there will be next generation WiFi (IEEE). 802.11ax) operates, so the 5 GHz band is a state in which multiple systems coexist, and collisions or collisions are prone to occur, and multiple systems interfere with each other. To solve the above problems, the method proposed by the present invention is based on LBT (Listen before Talk). LBT has multiple implementation forms, and its common concept includes two-stage actions: 1. Clear channel assessment (CCA) - The transmitting end must perform channel detection on the radio resources to be transmitted before transmitting to distinguish whether There is interference, the action to distinguish whether there is interference is collectively called CCA, channel detection can be pure energy detection (detecting wireless resources Energy), or the received signal and interpret the received signal is a signal interference, etc., 2. Data Transmission - After passing through the CCA, if the radio resource is determined to be free of interference, the transmitting end may start data transmission, but if the radio resource is determined to have interference, data transmission is not possible.

Please refer to the first figure, which is a flowchart of a wireless access method for coexistence of multiple systems according to the present invention. As shown in the figure, the present invention provides a multi-system coexistence wireless access method, the steps comprising: (A) a first communication terminal performing a complex channel condition estimation S101; (B) estimating the complex channel condition Obtaining a interference probability value S102; (C) if the interference probability value is greater than a threshold value, the first communication end notifies a second communication terminal to perform a random access wireless access mode, and utilizes the random access type The wireless access mode transmits a data to the second communication terminal S103; (D) if the interference probability value is less than the threshold value, the first communication terminal notifies the second communication terminal to perform a resource allocation scheduling wireless connection The data is transmitted to the second communication terminal S104 by using the wireless access mode of the resource allocation schedule; wherein the data is a downlink data (the base station transmits to the mobile station).

The multi-communication system of the present invention determines the wireless access mode based on the radio resource allocation schedule or the random access type wireless access method according to the probability of interference (or poor fading channel). If the probability of interference (or the channel condition is too low for communication) is greater than a certain threshold, then the random access wireless access method is adopted. If the interference (or the channel condition is too poor to communicate), the probability is less than a certain probability. The threshold value is based on the wireless resource allocation schedule based on the wireless access method.

When the probability of occurrence of interference in a certain channel condition (radio resource) is p, the number of all radio resources (channels) is M. If the radio access method based on radio resource allocation scheduling is used, the use of each radio resource is used. The benefit (no chance of interference) is 1-p. If random access wireless access is used, the benefit of each wireless resource is Where N is the number of transmitting ends using these M radio resources (channels), so the benefit of using each radio resource is a function of N and p; when using random access type radio access, each radio resource The maximum benefit of using (channel) is The best number of transmitters to achieve this maximum benefit is From this result, we can observe that if there is only one radio resource, the optimal number of transmitting ends using this radio resource is If there are M radio resources, the optimal number of transmitting ends using this radio resource is The use of the random access type of wireless access method can achieve a higher efficiency per wireless resource than the wireless access allocation based on the wireless resource allocation schedule. This condition is further streamlined to If the above condition is met, the wireless access method is adopted, and the wireless resource use efficiency is better; otherwise, the wireless resource allocation schedule-based wireless access method is used, and the wireless resource use benefit is better; In the embodiment, the wireless access mode of the resource allocation schedule can be used by: (1) single channel, (2) fixed (FDMA, TDMA, CDMA,), (3) frequency division multiple access, and the like. Access (access), and random access wireless access method can be accessed (accessed) using one of Aloha, slot aloha, CSMA, CSMA/CA.

Please refer to the second figure, which is a flowchart of another multi-system coexistence wireless access method according to the present invention. As shown in the figure, the present invention provides a multi-system coexistence wireless access method, the steps comprising: (A) a first communication terminal performing a complex channel condition estimation S201; (B) estimating the complex channel condition Obtaining a jamming probability value S202; (C) if the jamming probability value is greater than a threshold value, the first communications end notifies a second communications terminal to perform a random access wireless access mode, and the second communications terminal utilizes the The random access wireless access mode transmits a data to the first communication terminal S203; (D) if the interference probability value is less than the threshold value, the first communication terminal notifies the second communication terminal to perform a resource allocation row Wireless In the receiving mode, the second communication end transmits the data to the first communication terminal S204 by using the wireless access mode of the resource allocation schedule; wherein the data is an uplink data (the mobile station transmits to the base station).

The invention can be applied to 3GPP LTE Licensed-Assisted Access (LAA), IEEE 802.11ax and subsequent communication systems, and can also be used for cloud radio access networks (CRAN) and fog terminal access networks. Fog radio access networks (FRAN); the cloud access network routes multiple base stations and user devices or consists of user devices. Each base station can extend multiple remote radio heads (RRHs) and baseband units (BBUs). The RRHs/BBUs can be connected to the base station through a wired interface (such as a fiber-optic cable). Therefore, the RRHs/BBUs can be deployed in a wide range of high-density, and the user interface can be connected to the RRHs through the wireless interface. The BBUs transmit and receive data. The radio resource allocation of all RRHs/BBUs and user equipment uplink and downlink data transmission is performed by the base station. Therefore, the cloud wireless access network usually adopts the wireless access method based on the allocation schedule. The fog end access network allows multiple user devices to directly exchange data without transceiving the base station, or allows the small cell to not be used. In the case of forwarding to the core networks, multiple user devices are assisted in data exchange. Therefore, no one is responsible for the wireless resource allocation of all small base stations and user devices under the mist terminal network architecture. The role of the program, therefore usually adopts the random access wireless access method, the method proposed by the invention can be used to determine the use of the cloud access network architecture or fog end Access the network architecture to maximize the benefits of using each unit of wireless resources.

The above-described embodiments are merely illustrative of the features and functions of the present invention and are not intended to limit the scope of the technical content of the present invention. Any person skilled in the art can modify and change the above embodiments without departing from the spirit and scope of the creation. Therefore, the scope of protection of this creation should be as listed in the scope of the patent application described later.

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Claims (8)

A multi-system coexistence wireless access method includes the steps of: (A) performing a complex channel condition estimation by a first communication terminal; (B) obtaining a interference probability value by the complex channel condition estimation; (C) The interference probability value is greater than a threshold value, and the first communication end notifies a second communication terminal to perform a random access wireless access mode, and uses the random access wireless access method to transmit a data to the a second communication end; (D) if the interference probability value is less than the threshold value, the first communication end notifies the second communication end to perform a wireless access mode of resource allocation scheduling, and uses the resource to allocate scheduled wireless Receiving the data to the second communication end; wherein the threshold is M: Number of complex channels. The wireless access method for multi-system coexistence as described in claim 1, wherein the first communication end is a base station. The wireless access method for multi-system coexistence as described in claim 1, wherein the second communication terminal is a mobile station. For example, the wireless access method for multi-system coexistence described in claim 1 is the following data. A multi-system coexistence wireless access method includes the steps of: (A) performing a complex channel condition estimation by a first communication terminal; (B) obtaining a interference probability value by the complex channel condition estimation; (C) The interference probability value is greater than a threshold value, and the first communication end notifies a second communication terminal to perform a random access wireless access mode, and the second communication terminal uses the random access wireless access mode to The data is transmitted to the first communication end; (D) if the interference probability value is less than the threshold value, the first communication end notifies the second communication end to perform a resource allocation scheduling wireless access mode, and the second communication end Transmitting the data to the first communication end by using the wireless access mode of the resource allocation schedule; wherein the threshold is M: Number of complex channels. The wireless access method for multi-system coexistence as described in claim 5, wherein the first communication end is a base station. The wireless access method of multi-system coexistence as described in claim 5, wherein the second communication end is a mobile station. For example, the wireless access method for multi-system coexistence described in claim 5, wherein the data is an uplink data.