CN106535203A - Method of D2D and WLAN to share ISM spectrum - Google Patents

Abstract

The invention discloses a method for sharing ISM spectrum between D2D and WLAN. The method has six steps, including sending trial signaling, preparing competition channels, preparing related users, starting competition mechanism, sending preemption results, and sending occupation signaling. This method fully develops and utilizes the advantages of centralized control and better coordination of the LTE system. Based on the D2D technology of the converged cellular network, with the help of the centralized control advantages of the base station eNB, the sharing of ISM spectrum is realized to efficiently solve multi-system coexistence and resource competition. and other issues, effectively configure and optimize cellular spectrum and ISM spectrum resources, improve spectrum utilization, and achieve efficient and optimized spectrum resource allocation.

Description

A method for D2D and WLAN to share ISM spectrum

technical field

The present invention relates to the technical field of mobile communication, in particular to a method for sharing ISM frequency spectrum between D2D and WLAN.

Background technique

With the rapid development of mobile communication technology, the demand for mobile communication services is growing explosively, and the available cellular resources are becoming increasingly tight. The LTE system introduces key technologies such as OFDM and MIMO, which significantly increases spectrum efficiency and data transmission rate. The ISM frequency band is a free frequency band defined by the International Telecommunication Union (ITU) without authorization. Based on the IEEE 802.11 technical standard, WLAN uses radio frequency technology and uses electromagnetic waves to communicate in the air. It has become the most common and widely used wireless system in this frequency band, and will also become the main competitor of LTE system in this frequency band.

D2D communication aims to enable user communication devices within a certain range to communicate directly, so as to reduce the load on the serving base station. At present, D2D, as a supplementary technology of the cellular network, has become a key technology applied in the LTE-Advanced network. A technique in which D2D utilizes LTE may be referred to as LTE D2D. LTE D2D and WLAN systems occupy the same frequency band, so there is potential vicious competition between frequency band interference and geographical regions. Too many D2D pairs and WLAN stations competing for channels at the same time will cause large time delay and conflicts, which will greatly reduce channel utilization efficiency.

Contents of the invention

In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a method for D2D and WLAN to share ISM spectrum, so as to solve the problem of D2D clusters competing in ISM spectrum under the coexistence state of WLAN and cellular network.

In order to achieve the above object, the present invention provides a method for D2D and WLAN to share ISM spectrum, which is characterized in that it includes the following steps:

Step 1. Send trial signaling. The eNB first sends an ISM trial signaling to the cluster head CH, inviting the cluster head and its members to try to compete for the ISM frequency band for communication services;

Step 2: Prepare to compete for the channel. After receiving the ISM trial signaling from the eNB, the cluster head CH starts to search for WLAN signals and decides the ISM channel to compete for. Inner related D2D members prepare signaling for broadcast ISM channel competition;

Step 3: related user preparation, after the related users in the cluster receive the ISM channel competition preparation signaling:

1. If the MAC address flag is 1, the RTS sender UEi will retrieve the MAC address of the CTS sender UEj saved by itself, and then directly enter step 4;

2. If the MAC address flag is 0, the relevant D2D pair user UEs need to exchange each other's MAC addresses through the cluster head CH, and the UEs will store the received MAC addresses of other users locally;

Step 4, the competition mechanism is started, and the related user UEs preparing to compete for the ISM channel act as virtual WLAN users, and use the extended CSMA/CA mechanism to start the competition channel mechanism:

Step 5: Send the preemption result. If the RTS sender UEi successfully receives the CTS of its corresponding D2D user UEj, that is, the D2D will preempt the ISM channel for UEi/UEj, UEi will send the preemption result indication signaling to the cluster head CH; if If the preemption of the ISM channel fails, the cluster will maintain the initial configuration state of the cellular communication spectrum;

Step 6: Send occupancy signaling. If the cluster head CH receives the indication of successfully occupying the ISM channel from the RTS sender UEi, the cluster head CH will send signaling to the base station eNB that its cluster members successfully occupy the ISM channel, and the signaling contains the duration of using the ISM channel, so that the base station eNB can allocate the cellular spectrum resources previously allocated to the cluster to other cluster users during this period.

The above-mentioned method for sharing ISM spectrum between D2D and WLAN is characterized in that: the fourth step is specifically:

1. The RTS sender UEi first updates its own RTS frame information, fills its own MAC address into the TA bit of the RTS frame, and fills the corresponding MAC address of the CTS sender UEj into the RA bit, and fills in the service duration bit The communication service duration indicated in the ISM channel contention preparation signaling;

2. In channel competition for unicast services, when user UEj receives an RTS frame and detects that the MAC address in the RA bit is its own, it will feed back a CTS frame to the corresponding user UEj according to the WLAN contention channel process mechanism. The RA bit is filled with the MAC address corresponding to the RTS sender UEi.

The beneficial effects of the present invention are:

The present invention fully develops and utilizes the advantages of centralized control and better coordination of the LTE system. Based on the D2D technology of the integrated cellular network, with the help of the centralized control advantages of the base station eNB, the sharing of ISM spectrum is realized to efficiently solve multi-system coexistence and resource competition. and other issues, effectively configure and optimize cellular spectrum and ISM spectrum resources, improve spectrum utilization, and achieve efficient and optimized spectrum resource allocation.

The idea, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention.

Description of drawings

Fig. 1 is a flowchart of distributed spectrum competition in the present invention.

FIG. 2 is a scene diagram of coexistence of an LTE D2D system and a WLAN system according to the present invention.

detailed description

Figure 2 depicts the scenario model of a single-cell system. There are multiple mobile users in a cell. It is assumed that each user has a temporary cellular network identifier (C-RNTI), and some users can join the LAN for cellular communication. , can also form a D2D cluster for short-distance communication. The assumed capabilities for the user equipment are as follows:

1.LTE device has dual mode of LTE and WLAN.

2. Each user equipment has two radio frequency antenna systems, one for the cellular frequency band and the other for the ISM frequency band.

3. D2D users complete the pairing through the cellular frequency band. Like WLAN base stations, they use the CSMA/CA mechanism to monitor and compete for the ISM frequency band.

Among these users, a user equipment with the best channel quality can be selected as the cluster head CH, which is responsible for managing the cluster and knowing the communication requirements and service categories of the cluster members. In addition, the cluster head CH also specifies the RTS and CTS senders of the D2D member pairs, as well as their required communication duration. The cluster head CH also knows whether the relevant communication members in the cluster have exchanged MAC addresses with each other.

Among them, in the model in which the D2D communication system and the WLAN communication system share spectrum resources mentioned in the present invention, the relationship between the D2D device and the WLAN device is completely equal, and there is no concept of high-level users or low-level users.

According to the system scenario shown in FIG. 2 , the specific steps of the mechanism proposed in the present invention will be introduced in detail below.

As shown in Figure 1, a method for D2D and WLAN to share ISM spectrum is characterized in that it includes the following steps:

Step 1. Send trial signaling. The eNB first sends an ISM trial signaling to the cluster head CH, inviting the cluster head and its members to try to compete for the ISM frequency band for communication services;

Step 2: Prepare to compete for the channel. After receiving the ISM trial signaling from the eNB, the cluster head CH starts to search for WLAN signals and decides the ISM channel to compete for. Inner related D2D members prepare signaling for broadcast ISM channel competition, and the information contained in the signaling is shown in Table 1;

Table 1: Information bits of ISM channel contention preparation signaling

Step 3: related user preparation, after the related users in the cluster receive the ISM channel competition preparation signaling:

1. If the MAC address flag is 1, the RTS sender UEi will retrieve the MAC address of the CTS sender UEj saved by itself, and then directly enter step 4;

2. If the MAC address flag is 0, the relevant D2D pair user UEs need to exchange each other's MAC addresses through the cluster head CH, and the UEs will store the received MAC addresses of other users locally;

Step 4, the competition mechanism is started, and the related user UEs preparing to compete for the ISM channel act as virtual WLAN users, and use the extended CSMA/CA mechanism to start the competition channel mechanism:

Step 5: Send the preemption result. If the RTS sender UEi successfully receives the CTS of its corresponding D2D user UEj, that is, the D2D will preempt the ISM channel for UEi/UEj, UEi will send the preemption result indication signaling to the cluster head CH; if If the preemption of the ISM channel fails, the cluster will maintain the initial configuration state of the cellular communication spectrum;

Step 6: Send occupancy signaling. If the cluster head CH receives the indication of successfully occupying the ISM channel from the RTS sender UEi, the cluster head CH will send signaling to the base station eNB that its cluster members successfully occupy the ISM channel, and the signaling contains the duration of using the ISM channel, so that the base station eNB can allocate the cellular spectrum resources previously allocated to the cluster to other cluster users during this period.

In this embodiment, the step four is specifically:

1. The RTS sender UEi first updates its own RTS frame information, fills its own MAC address into the TA bit of the RTS frame, and fills the corresponding MAC address of the CTS sender UEj into the RA bit, and fills in the service duration bit The communication service duration marked in the ISM channel contention preparation signaling.

2. In channel competition for unicast services, when user UEj receives an RTS frame and detects that the MAC address in the RA bit is its own, it will feed back a CTS frame to the corresponding user UEj according to the WLAN contention channel process mechanism. The RA bit is filled with the MAC address corresponding to the RTS sender UEi.

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection defined by the claims.

Claims (6)

1. A method for D2D and WLAN sharing ISM frequency spectrum, is characterized in that, comprises the following steps: Step 1. Send trial signaling. The base station eNB first sends an ISM trial signaling to the cluster head CH, inviting the cluster head and its members to try to compete for the ISM frequency band for communication services; Step 2: Prepare to compete for the channel. After the cluster head CH receives the ISM attempt signaling from the base station eNB, it starts to search for WLAN signals and decides the ISM channel to compete for. Related D2D members in the cluster prepare signaling for broadcast ISM channel competition; Step 3: Preparation of relevant users. UEi and UEj are a pair of D2D users, and UEs is the general name of the internal users. After the relevant D2D users in the cluster receive the ISM channel competition preparation signaling, user UEi obtains user UEj through a certain method. MAC address; Step 4, the competition mechanism is started, and the related user UEs preparing to compete for the ISM channel act as virtual WLAN users, and use the extended CSMA/CA mechanism to start the competition channel mechanism: Step 5: Send the preemption result. If the D2D indicates that the user UEi and the user UEj successfully occupy the ISM channel, the cluster head sends a signaling to the base station that the cluster member successfully preempts the ISM channel; Step 6: Send an occupation signaling. After receiving the signaling that the user UEi successfully occupies the ISM channel, the cluster head sends the signaling to the eNB that its member successfully occupies the channel, and includes the usage time. 2. A method for sharing ISM spectrum between D2D and WLAN as claimed in claim 1, characterized in that: said step four is specifically: 1. The RTS sender UEi first updates its own RTS frame information, fills its own MAC address into the TA bit of the RTS frame, and fills the MAC address of the corresponding clear-to-send frame CTS sender UEj into the RA bit, and fills in the service duration bit Fill in the communication service duration marked in the ISM channel competition preparation signaling; 2. In channel competition for unicast services, when user UEj receives an RTS frame and detects that the MAC address in the RA bit is its own, it will feed back a CTS frame to the corresponding user UEj according to the WLAN contention channel process mechanism. The RA bit is filled with the MAC address corresponding to the RTS sender UEi. 3. A method for sharing ISM spectrum between D2D and WLAN as claimed in claim 1, characterized in that: in the step 3, the user UEi obtains the MAC address of the user UEj through a certain method, and the specific operation is as follows: 1. If the MAC address flag is 1, the sender UEi of the request to send frame RTS will retrieve the MAC address of the sender UEj of the clear to send frame CTS sent by itself, and then directly enter step 4; 2. If the flag bit of the MAC address is 0, all relevant D2D user UEs related to this need to exchange each other's MAC addresses through the cluster head CH, and the UEs store the received MAC addresses of other users locally. 4. A method for sharing ISM spectrum between D2D and WLAN according to claim 1, characterized in that, The step five is specifically: if the sender UEi of the request to send frame RTS successfully receives the clear-to-send frame CTS of its corresponding D2D user UEj, that is, D2D will preempt the ISM channel for UEi/UEj, UEi will send a preemption message to the cluster head CH The result indicates the signaling; if the preemption of the ISM channel fails, the cluster will maintain the initial configuration state of the cellular communication spectrum. 5. A method for sharing ISM spectrum between D2D and WLAN according to claim 1, characterized in that said step 6 is specifically: if the cluster head CH receives the successful occupation of the ISM spectrum from UEi, the sender of the request to send frame RTS After channel indication, the cluster head CH will send signaling to the base station eNB that its cluster members have successfully occupied the ISM channel, and the signaling includes the duration of using the ISM channel. During this period, the base station eNB will allocate the cellular spectrum previously allocated to the cluster Resources are allocated for use by other cluster users. 6. A method for sharing ISM spectrum between D2D and WLAN as claimed in claim 1, characterized in that in step 3, each user's equipment has two sets of radio frequency antenna systems, one set is used for cellular frequency band, and the other set is used for in the ISM band.