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US 11,638,300 B2Granted
Channel access mechanism for random access channel in unlicensed spectrum
AssigneeHuawei Technologies Co., Ltd.
InventorsJiayin Zhang, Mohamed Adel Salem, Liqing Zhang
Life of this patent
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Abstract
Method and devices are provided for a channel access mechanism for accessing a network on a random access channel (RACH). Methods involve defining a listen-before-talk (LBT) category to be used as part of a contention based procedure and how a contention window that is part of the LBT can be dynamically adjusted.
Claims18
A method for wireless communications occurring in an unlicensed spectrum for accessing a network, the method comprising:
- transmitting in a random access procedure, by an apparatus, a first message in a random access channel (RACH) resource using a contention window size (CWS), the first message including a random access preamble;
- maintaining in the random access procedure, by the apparatus, the CWS for a listen-before-talk (LBT) category 4 (CAT 4) contention procedure or type 1 UL channel access procedure for an uplink (UL) transmission subsequent to the first message, the UL transmission to be based on receipt of a second message to be received from a base station during a specified message reception time window;
- and
- transmitting, by the apparatus, the UL transmission using the CWS.
1 more element
A method for wireless communications occurring in an unlicensed spectrum for accessing a network comprising:
- transmitting, by an apparatus, a first message in a random access channel (RACH) resource, the first message including a random access preamble and using a category 4 (CAT 4) contention procedure having a contention window size (CWS);
- receiving, by the apparatus, a second message from a base station that includes an indication that a type of listen-before-talk (LBT) contention procedure to be used for a subsequent uplink (UL) transmission is CAT 4;
- maintaining, by the apparatus based on the second message, the CWS for a first UL transmission of the subsequent UL transmission;
- and
- transmitting, by the apparatus, the first UL transmission using the CWS.
2 more elements
An apparatus comprising:
- one or more processors;
- and
- a non-transitory computer readable storage medium storing programming for execution by the one or more processors, the programming including instructions to cause the apparatus to:
- transmit in a random access procedure a first message in a random access channel (RACH) resource using a contention window size (CWS), the first message including a random access preamble;
- maintain in the random access procedure the CWS for a listen-before-talk (LBT) category 4 (CAT 4) contention procedure or type 1 UL channel access procedure for an uplink (UL) transmission subsequent to the first message, the UL transmission to be based on receipt of a second message to be received from a base station during a specified message reception time window;
- and
- transmit the UL transmission using the CWS.
4 more elements
An apparatus comprising:
- one or more processors;
- and
- a non-transitory computer readable storage medium storing programming for execution by the one or more processors, the programming including instructions to cause the apparatus to:
- transmit a first message in a random access channel (RACH) resource, the first message including a random access preamble and using a category 4 (CAT 4) contention procedure having a contention window size (CWS);
- receive a second message from a base station that includes an indication that a type of listen-before-talk (LBT) contention procedure to be used for a subsequent uplink (UL) transmission is CAT 4;
- maintain, based on the second message, the CWS for a first UL transmission of the subsequent UL transmission;
- and
- transmit the first UL transmission using the CWS.
5 more elements
A non-transitory computer-readable storage medium comprising instructions which, when executed by an apparatus, cause the apparatus to perform operations comprising:
- transmitting in a random access procedure a first message in a random access channel (RACH) resource using a contention window size (CWS), the first message including a random access preamble;
- maintaining in the random access procedure the CWS for a listen-before-talk (LBT) category 4 (CAT 4) contention procedure or type 1 UL channel access procedure for an uplink (UL) transmission subsequent to the first message, the UL transmission to be based on receipt of a second message to be received from a base station during a specified message reception time window, wherein the CWS is a CWS used for the first message;
- and
- transmitting the UL transmission using the CWS.
1 more element
A non-transitory computer-readable storage medium comprising instructions which, when executed by an apparatus, cause the apparatus to perform operations comprising:
- transmitting a first message in a random access channel (RACH) resource, the first message including a random access preamble and using a category 4 (CAT 4) contention procedure having a contention window size (CWS);
- receiving a second message from a base station that includes an indication that a type of listen-before-talk (LBT) contention procedure to be used for a subsequent uplink (UL) transmission is CAT 4;
- maintaining the CWS for a first UL transmission of the subsequent UL transmission based on the second message;
- and
- transmit the first UL transmission using the CWS.
2 more elements
Dependencies are inferred from the claim text.