CN110611547A - Full-duplex relay channel access method - Google Patents
Full-duplex relay channel access method Download PDFInfo
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- CN110611547A CN110611547A CN201810617194.8A CN201810617194A CN110611547A CN 110611547 A CN110611547 A CN 110611547A CN 201810617194 A CN201810617194 A CN 201810617194A CN 110611547 A CN110611547 A CN 110611547A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The application provides a full-duplex relay channel access method, which comprises the following steps: a source node sends an RTS signal to surrounding nodes; when the relay node receives the RTS signal sent by the source node, a CTS signal is sent to the surrounding nodes at an interval time T1; if the destination node receives the RTS signal sent by the source node, the interval time T1 feeds back the same CTS signal sent by the relay node to the source node when the RTS signal sent by the source node is received; when the source node receives the CTS signal, a timer is started, and the timing duration is T2; when the timer is up, sending data to the destination node; when the relay node receives the data sent to the destination node by the source node, the data is forwarded to the destination node while being received. The method can avoid receiving collision between the relay node and the destination node side.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a full-duplex relay channel access method.
Background
Two transmission steps are required for data transmission in conventional relay communication: the first step is that the source node sends data to the relay node, and the second step is that the relay node forwards the data to the destination node.
When the relay applies full duplex technology to send and receive data simultaneously, i.e. to forward the data to the destination node while receiving data from the source node. The full-duplex relay can enable data to reach a destination node from a source node through a relay node only by one step, and the time overhead of transmission is saved to a great extent.
When the full-duplex relay communication is applied to a wireless local area network and a carrier sense mode is adopted for channel access, the problem of interference from hidden nodes around a relay node and a target node can be encountered. The traditional method for avoiding the hidden node interference problem comprises the following two steps:
first, CTS-to-self: the source node sends a CTS-to-self signal to the surrounding nodes indicating that the channel is occupied, informing the surrounding nodes to re-access the channel after a specified time.
Second, Request To Send (RTS)/Clear To Send (CTS): the source node firstly sends an RTS information request to occupy the channel, the destination node receives the information and feeds back a CTS information, and the nodes (except the source node) which receive the CTS information around the destination node access the channel after the appointed time.
In full-duplex relay communication, on one hand, a source node and a relay node simultaneously occupy the same channel to transmit data, and on the other hand, the relay node and a destination node simultaneously utilize the same channel to receive data. The two mechanisms are designed for only one node occupying a channel to transmit data at the same time, and cannot be directly applied to full-duplex relay communication.
Disclosure of Invention
In view of this, the present application provides a full-duplex relay channel access method, which can avoid receiving collision between a relay node and a destination node side.
In order to solve the technical problem, the technical scheme of the application is realized as follows:
a full duplex relay channel access method comprises the following steps:
a source node requests to send an RTS signal to surrounding nodes;
when the relay node receives the RTS signal sent by the source node, a CTS signal is sent to the surrounding nodes at an interval time T1;
if the destination node receives the RTS signal sent by the source node, the interval time T1 feeds back the same CTS signal sent by the relay node to the source node when the RTS signal sent by the source node is received;
when the source node receives the CTS signal, a timer is started, and the timing duration is T2; when the timer is up, sending data to the destination node;
when the relay node receives the data sent to the destination node by the source node, the data is forwarded to the destination node while being received.
According to the technical scheme, the source node sends the RTS signal, the destination node responds to the CTS signal, the time for waiting for sending the data is set, the hidden nodes around the relay node and the destination node can be removed simultaneously, and the receiving collision between the relay node and the destination node side can be avoided.
Drawings
Fig. 1 is a schematic process flow diagram of a procedure for implementing full duplex relay channel access in an embodiment of the present application;
fig. 2 is a schematic diagram of a scenario in which a destination node may receive an RTS signal sent by a source node in an embodiment of the present application;
fig. 3 is a schematic process flow diagram of a second implementation of full duplex relay channel access in an embodiment of the present application;
fig. 4 is a schematic diagram of a scenario in which a destination node cannot receive an RTS signal sent by a source node in this embodiment of the application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings and examples.
The embodiment of the application provides a full-duplex relay channel access method, which is characterized in that a source node sends an RTS signal, and a destination node responds to the time of a CTS signal to set the time for waiting for sending data, so that hidden nodes around a relay node and the destination node can be removed simultaneously, and the receiving collision between the relay node and the destination node side can be avoided.
The following describes in detail a procedure for implementing full-duplex relay channel access in the embodiment of the present application with reference to the accompanying drawings.
Example one
The method aims at the scene that the destination node can receive the RTS signal sent by the source node.
Referring to fig. 1, fig. 1 is a schematic process flow diagram of a process for implementing full-duplex relay channel access in the embodiment of the present application. The method comprises the following specific steps:
and step 101, the source node sends an RTS signal to surrounding nodes.
Referring to fig. 2, fig. 2 is a schematic diagram of a scenario in which a destination node may receive an RTS signal sent by a source node in this embodiment of the present application.
As shown in fig. 2, the RTS signal sent by the source node is received by the relay node and the destination node.
And step 102, when the relay node receives the RTS signal sent by the source node, the relay node sends a CTS signal to the surrounding nodes at an interval time T1.
Step 103, if the destination node receives the RTS signal sent by the source node, the interval time T1 feeds back the same CTS signal sent by the relay node to the source node when receiving the RTS signal sent by the source node.
As shown in fig. 2, when the relay node and the destination node receive the RTS signal, the same CTS signal is fed back to the source node at an interval T1.
104, when the source node receives the CTS signal, starting a timer, wherein the timing duration is T2; when the timer is up, the data is sent to the destination node.
Wherein T2 is greater than T1.
And 105, when the relay node receives the data sent to the destination node by the source node, the data is transmitted to the destination node while being received.
After receiving the CTS signal, the relay node and the peripheral nodes (other nodes) of the destination node both perform channel back-off, start Network Allocation Vector (NAV) timing, and restart channel contention after waiting for completion of data transmission.
In the scenario shown in fig. 2, after the source node starts the timer with the timing T2, the source node does not receive the CTS signal transmitted by the destination node any more, and therefore, the source node may wait for T2 time directly and perform data transmission.
Example two
Aiming at the scene that the destination node can not receive the RTS signal sent by the source node.
Referring to fig. 3, fig. 3 is a schematic process flow diagram of a second implementation of full duplex relay channel access in the embodiment of the present application. The method comprises the following specific steps:
in step 301, the source node sends an RTS signal to surrounding nodes.
Referring to fig. 4, fig. 4 is a schematic diagram of a scenario in which a destination node cannot receive an RTS signal sent by a source node in the embodiment of the present application.
As shown in fig. 4, the RTS signal sent by the source node is only received by the relay node.
Step 302, when the relay node receives the RTS signal sent by the source node, it sends a CTS signal to the surrounding nodes at an interval T1.
In step 303, if the destination node does not receive the RTS signal sent by the source node, the interval time T1 sends a CTS signal to the surrounding nodes when receiving the CTS signal sent by the relay node.
Step 304, when the source node receives the CTS signal sent by the relay node, starting a timer, and timing for a time period of T2; when a CTS signal sent by a destination node is received in the timing process of the timer, closing the currently started timer, and restarting the timer with the timing duration of T1; when the timer is up, the data is sent to the destination node.
When the source node receives a CTS signal of the relay node, starting a timer with the timing duration of T2; in the timer timing process, when a CTS signal sent by the destination node is received, the timer is closed, and then the timer with the timing duration of T1 is started. And when the timer is timed out, data transmission is carried out.
The source node receives the CTS sent by the destination node, i.e., a relaystts equivalent to an RTS to the STA.
In step 305, when the relay node receives the data sent by the source node to the destination node, the data is forwarded to the destination node while being received.
After receiving the CTS signal, the relay node and the peripheral nodes (other nodes) of the destination node both perform channel backoff, start NAV timing, and restart channel contention after data transmission is completed. Therefore, the receiving collision between the relay node and the destination node can be avoided.
In the scenario shown in fig. 4, the source node starts the timer with the timing T2 and then receives the CTS signal sent by the destination node, so that the source node may wait for T1 time before transmitting data when receiving the CTS signal sent by the destination node.
The time lengths in fig. 2 and 4 are merely illustrative and do not represent the time lengths, i.e., the ratio of T1 to T2.
For the first and second embodiments, the following relationships exist between T2 and T1:
t2 is more than or equal to 2 XT 1+ A; a is the time from the transmission of the CTS signal by the destination node to the correct reception of the CTS signal by the source node, so as to avoid the collision between the data transmitted by the source node and the CTS signal transmitted by the destination node and forwarded by the relay node. T2 is a long frame and T1 is a short time duration.
When the wireless local area network AP sends data to the STA through the full-duplex relay, or the STA sends data to the AP through the full-duplex relay, the technical scheme provided by the embodiment of the application can be used for channel access.
To sum up, the source node sends the RTS signal, and the destination node responds to the CTS signal to set the time for waiting for data transmission, so that the hidden nodes around the relay node and the destination node can be removed, and the receiving collision between the relay node and the destination node can be avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A full duplex relay channel access method is characterized in that the method comprises the following steps:
a source node sends a request to send RTS signal to surrounding nodes;
when the relay node receives an RTS signal sent by a source node, a clear-to-send (CTS) signal is sent to surrounding nodes at an interval T1;
if the destination node receives the RTS signal sent by the source node, the interval time T1 feeds back the same CTS signal sent by the relay node to the source node when the RTS signal sent by the source node is received;
when the source node receives the CTS signal, a timer is started, and the timing duration is T2; when the timer is up, sending data to the destination node;
when the relay node receives the data sent to the destination node by the source node, the data is forwarded to the destination node while being received.
2. The method of claim 1, further comprising:
if the destination node does not receive the RTS signal sent by the source node, when receiving the CTS signal sent by the relay node, the interval time T1 sends the CTS signal to the surrounding nodes;
when the source node receives a CTS signal sent by the relay node, starting a timer, wherein the timing duration is T2; when a CTS signal sent by a destination node is received in the timing process of the timer, closing the currently started timer, and restarting the timer with the timing duration of T1; when the timer is up, sending data to the destination node;
when the relay node receives the data sent to the destination node by the source node, the data is forwarded to the destination node while being received.
3. The method of claim 1,
t2 is more than or equal to 2 XT 1+ A; where a is the time from when the CTS signal is sent from the destination node to when the CTS signal is correctly received by the source node.
4. The method according to any one of claims 1-3, wherein the method further comprises:
after receiving the CTS signal, the relay node and the peripheral nodes of the target node both carry out channel backoff, start network allocation vector NAV timing, and restart channel contention after data transmission is finished.
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| CN201810617194.8A CN110611547B (en) | 2018-06-15 | 2018-06-15 | Full-duplex relay channel access method |
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| CN201810617194.8A CN110611547B (en) | 2018-06-15 | 2018-06-15 | Full-duplex relay channel access method |
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| CN110611547B CN110611547B (en) | 2022-03-29 |
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Patent Citations (6)
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| WO2005022775A1 (en) * | 2003-09-02 | 2005-03-10 | Koninklijke Philips Electronics N.V. | An adaptive power control mechanism in wlan |
| CN101754263A (en) * | 2008-12-15 | 2010-06-23 | 华为技术有限公司 | Method for selecting cooperative relay node, cooperative relay transmission method and system |
| CN102571305A (en) * | 2012-01-13 | 2012-07-11 | 中国人民解放军理工大学 | Implementation method for automatic repeat request (ARQ) in cooperative communication |
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