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CN-122002604-A - Channel access method and communication device

CN122002604ACN 122002604 ACN122002604 ACN 122002604ACN-122002604-A

Abstract

The application provides a channel access method and a communication device, wherein the method comprises the steps of determining back-off time information based on the length of a first time unit, wherein the back-off time information indicates a first duration of back-off executed by first equipment, the length of the first time unit is larger or smaller than the length of a time slot, and executing a back-off process according to the channel state of a first channel and the back-off time information, and the first channel is used for transmitting data of the first equipment after the back-off is finished. By determining the length of the second device for backoff based on the length of the time unit having a length greater than or less than one time slot, the probability of the first device colliding with other devices in the network over the air can be reduced, and thus the data transmission delay can be reduced.

Inventors

  • LI YANCHUN
  • ZENG YAN
  • DAI WENLEI

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260508
Application Date
20241102

Claims (16)

  1. 1. A method of channel access, for use with a first device, the method comprising: Determining back-off time information based on a length of a first time unit, the back-off time information indicating a first duration of back-off performed by the first device, the length of the first time unit being greater than a length of one slot; And executing a back-off process according to the channel state of a first channel and the back-off time information, wherein the first channel is used for transmitting data of the first device after the back-off is finished.
  2. 2. The method of claim 1, wherein the first time unit has a length N times a length of one slot, N being an integer greater than or equal to 2.
  3. 3. The method according to claim 1 or 2, wherein said performing a backoff procedure based on the channel state of the first channel and the backoff time information comprises: If the channel state is currently occupied, after a second duration of the first channel occupied ending time, executing a first back-off, wherein the duration of executing the first back-off is smaller than or equal to the first duration; wherein the backoff procedure includes the first backoff.
  4. 4. A method according to claim 3, wherein the second time period is determined based on the length of the first time unit.
  5. 5. The method of claim 4, wherein the second time period is a sum of a product of a length of the first time unit and an arbitration frame gap number AIFSN and a length of a short interframe space.
  6. 6. The method according to any one of claims 1 to 5, further comprising: And determining the length of the first time unit according to configuration information, wherein the configuration information configures the length of the first time unit.
  7. 7. A communication device, characterized by a device processing unit for: Determining back-off time information based on a length of a first time unit, the back-off time information indicating a first duration of back-off performed by the apparatus, the length of the first time unit being greater than a length of one slot; And executing a back-off process according to the channel state of a first channel and the back-off time information, wherein the first channel is used for transmitting data of the device after the back-off is finished.
  8. 8. The apparatus of claim 7, wherein the first time unit has a length N times a length of one slot, N being an integer greater than or equal to 2.
  9. 9. The device according to claim 7 or 8, characterized in that the processing unit is specifically configured to: If the channel state is currently occupied, after a second duration of the first channel occupied ending time, executing a first back-off, wherein the duration of executing the first back-off is smaller than or equal to the first duration; wherein the backoff procedure includes the first backoff.
  10. 10. The apparatus of claim 9, wherein the second time period is determined based on a length of the first time unit.
  11. 11. The apparatus of claim 10, wherein the second time period is a sum of a product of a length of the first time unit and an arbitration frame gap number AIFSN and a length of a short inter-frame space.
  12. 12. The apparatus according to any one of claims 7 to 11, wherein the processing unit is further configured to: And determining the length of the first time unit according to configuration information, wherein the configuration information configures the length of the first time unit.
  13. 13. A communication device comprising means for performing the method according to any one of claims 1 to 6.
  14. 14. A communication device comprising a transceiver for receiving signals and transmitting the signals to the processor or to other communication devices than the communication device, and a processor for performing the method of any of claims 1 to 6.
  15. 15. A computer readable storage medium, characterized in that the storage medium has stored therein a computer program or instructions which, when executed by a communication device, implement the method of any of claims 1 to 6.
  16. 16. A computer program product comprising a computer program which, when run, implements the method according to any one of claims 1 to 6.

Description

Channel access method and communication device Technical Field The present application relates to the field of communications, and more particularly, to a method and a communication device for channel access. Background With the development of communication technology, optical fiber transmission is increasingly being used in communication systems, where optical fiber to the room (fiber to the room, FTTR) is an important ring in optical networks. The FTTR system comprises a master device (MAIN DEVICE) and a slave device (sub device), wherein the master device and the slave device are connected through optical fibers. The master device is an optical network terminal (optical network terminal, ONT), also called an optical network unit (optical network unit, ONU), in a passive optical network (passive optical network, PON) and is connected to an optical line terminal (optical LINE TERMINAL, OLT) at the operator's office by an optical fiber. In FTTR systems, each device may contend for the channel independently. For example, the back-off, preempting the channel occurs through an enhanced distributed channel access (enhanced distributed CHANNEL ACCESS, EDCA) mechanism, and the data is sent after the preemption of the channel is successful. When one device seizes the channel, other devices can judge busy/idle state of the channel according to the channel interception condition, and can complete back-off and access the channel under the condition that the channel is in idle state. Under the channel access mechanism, the two devices may collide with each other when transmitting the data frame, that is, the channel interception of the two devices cannot timely sense the opening of the data frame transmitted by the other device, so that the data packets of the two devices interfere with each other, the data cannot be transmitted in time, and the data transmission delay is further increased. Therefore, how to reduce the data transmission delay is a problem to be considered. Disclosure of Invention The application provides a channel access method and a communication device, which can reduce the probability of air interface collision, thereby reducing data transmission delay. In a first aspect, a method of channel access is provided, which may be performed by a first device, or by a component of the first device (e.g., a chip or circuit or chip system). The following describes an example of execution by the first device. The method includes determining back-off time information based on a length of a first time unit indicating a first duration of back-off performed by the first device, the length of the first time unit being greater than or less than a length of one slot, and performing a back-off procedure according to a channel state of a first channel and the back-off time information, wherein the first channel is used for transmitting data of the first device after the back-off is ended. Based on the scheme, the time length of the second device for carrying out back-off is determined based on the time unit length which is larger or smaller than one time slot, so that the probability of air interface collision between the first device and other devices in the network can be reduced, and the data transmission delay can be reduced. In certain implementations of the first aspect, where the length of the first time unit is greater than the length of one slot, the length of the first time unit is N times the length of one slot, N being an integer greater than or equal to 2. In some implementations of the first aspect, the performing a backoff procedure according to the channel state of the first channel and the backoff time information includes performing a first backoff after a second duration of an end time when the first channel is occupied if the channel state is currently occupied, the duration of performing the first backoff being less than or equal to the first duration, wherein the backoff procedure includes the first backoff. In certain implementations of the first aspect, the second time period is determined based on a length of the first time unit. In certain implementations of the first aspect, the second time period is a sum of a product of a length of the first time unit and an arbitration frame gap number AIFSN and a length of a short inter-frame gap. In certain implementations of the first aspect, the length of the first time unit is determined according to configuration information that configures the length of the first time unit to be greater than the length of one slot or that configures the length of the first time unit to be less than the length of one slot. In a second aspect, a communication apparatus is provided, where the apparatus may be a first device, or may be a component (such as a chip or a circuit or a chip system) of the first device, where the apparatus may have a function of implementing the first aspect, for example, the apparatus includes a module or a unit or means (means) correspondi