Electronic device in wireless communication system and wireless communication method with multiple channel access determination
Disclosed are an electronic device in a wireless communication system, and a wireless communication method. The wireless communication system comprises multiple unlicensed carriers. The electronic device comprises: one or more processing circuits configured to: configure each of a plurality of unlicensed carriers to be a primary channel or a secondary channel, so as to obtain at least two primary channels and at least one secondary channel; perform a first channel detection process over each of the primary channels to detect whether each of the primary channels is idle, and perform a second channel detection process over each of the secondary channels to detect whether each of the secondary channels is idle; and perform downlink data transmission over the primary channel determined to be idle by means of the channel detection or over the primary and secondary channels determined to be idle by means of the channel detection. By utilizing the electronic device and the wireless communication method, the probability of access to an unlicensed carrier is improved.
1. An electronic device in a wireless communication system, the wireless communication system comprising a plurality of unlicensed carriers, and the electronic device comprising:
one or more processing circuits configured to perform operations of:
acquiring information on channel detection parameters from a base station;
based on the acquired information, configuring the channel detection parameters for an uplink transmission on a plurality of first unlicensed carriers of the plurality of unlicensed carriers and a plurality of second unlicensed carriers of the plurality of unlicensed carriers;
based on the configured channel detection parameters, performing a first channel access process on the plurality of first unlicensed carriers and a second channel access process on the plurality of second unlicensed carriers,
wherein, based on the configured channel detection parameters:
the first channel access process comprises a first channel energy detection process that includes a random backoff, a variable contention window size and a self-deferral period, the first channel energy detection being individually configured for each of the plurality of first channels, and
the second channel access process is a second channel energy detection process that excludes random backoff and that is uniformly configured for each of the plurality of second channels, and
wherein ending times of the first and second channel access processes are aligned, with each of the plurality of first unlicensed carriers being aligned with the plurality of second unlicensed carriers based on the corresponding self-deferral periods of the plurality of first unlicensed carriers;
based on the first channel access process, detecting that a first unlicensed carrier of the plurality of first unlicensed carriers which has finished the first channel access process firstly is initially idle;
based on the first unlicensed carrier of the plurality of first unlicensed carriers which has finished the first channel access process firstly being initially idle, starting the second channel access process on the plurality of second unlicensed carriers while continuing to perform the first channel access process on the plurality of first unlicensed carriers;
subsequently detecting that the first unlicensed carrier of the plurality of first unlicensed carriers which has finished the first channel access process firstly is no longer idle but is occupied, and stopping the second channel access process while continuing to perform the first channel access process on the plurality of first unlicensed carriers;
after stopping the second channel access process, detecting that a first unlicensed carrier of the plurality of first unlicensed carriers which has finished the first channel access process secondly is idle;
based on detecting that the first of the plurality of first unlicensed carriers which has finished the first channel access process secondly is idle, triggering the second channel access process to restart while continuing to perform the first channel access process on the plurality of first unlicensed carriers; and
at a predetermined time, upon determining that the first of the plurality of first unlicensed carriers which has finished the first channel access process secondly remains idle, performing an uplink data transmission on:
the first of the plurality of first unlicensed carriers which has finished the first channel access process secondly, and
any of the plurality of second unlicensed carriers which are detected to be idle by the restarted second channel access process.
2. The electronic device of claim 1 , wherein the uplink data transmission is also performed on any other of the plurality of first unlicensed carriers which are determined to be idle at the predetermined time.
3. A method, implemented in circuitry of an electronic device, for performing wireless communication in a wireless communication system, the wireless communication system comprising a plurality of unlicensed carriers, and the method comprising:
acquiring information on channel detection parameters from a base station;
based on the acquired information, configuring the channel detection parameters for an uplink transmission on a plurality of first unlicensed carriers of the plurality of unlicensed carriers and a plurality of second unlicensed carriers of the plurality of unlicensed carriers;
based on the configured channel detection parameters, performing a first channel access process on the plurality of first unlicensed carriers and a second channel access process on the plurality of second unlicensed carriers,
wherein, based on the configured channel detection parameters:
the first channel access system comprises a first channel energy detection process that includes a random backoff, a variable contention window size and a self-deferral period, the first channel energy detection being individually configured for each of the plurality of first channels, and
the second channel access process is a second channel energy detection process that excludes random backoff and that is uniformly configured for each of the plurality of second channels, and
wherein ending times of the first and second channel access processes are aligned, with each of the plurality of first unlicensed carriers being aligned with the plurality of second unlicensed carriers based on the corresponding self-deferral periods of the plurality of first unlicensed carriers;
based on the first channel access process, detecting that a first unlicensed carrier of the plurality of first unlicensed carriers which has finished the first channel access process firstly is initially idle;
based on the first unlicensed carrier of the plurality of first unlicensed carriers which has finished the first channel access process firstly being initially idle, starting the second channel access process on the plurality of second unlicensed carriers while continuing to perform the first channel access process on the plurality of first unlicensed carriers;
subsequently detecting that the first unlicensed carrier of the plurality of first unlicensed carriers which has finished the first channel access process firstly is no longer idle but is occupied, and stopping the second channel access process while continuing to perform the first channel access process on the plurality of first unlicensed carriers;
after stopping the second channel access process, detecting that a first unlicensed carrier of the plurality of first unlicensed carriers which has finished the first channel access process secondly is idle;
based on detecting that the first of the plurality of first unlicensed carriers which has finished the first channel access process secondly is idle, triggering the second channel access process to restart while continuing to perform the first channel access process on the plurality of first unlicensed carriers; and
at a predetermined time, upon determining that the first of the plurality of first unlicensed carriers which has finished the first channel access process secondly remains idle, performing an uplink data transmission on:
the first of the plurality of first unlicensed carriers which has finished the first channel access process secondly, and
any of the plurality of second unlicensed carriers which are detected to be idle by the restarted second channel access process.
4. The method of claim 3 , wherein the uplink data transmission is also performed on any other of the plurality of first unlicensed carriers which are determined to be idle at the predetermined time.