BACKGROUND

Technical Field

The present disclosure relates to a transmission scheme in a wireless communication system, and in particular to a method and device related to uplink transmission.

Related Art

The application scenarios of future wireless communication systems are increasingly diversified, and different application scenarios impose different performance requirements on the system. In order to meet the different performance requirements of various application scenarios, Wireless Access Network (RAN) #72 plenary meeting of the 3rd Generation Partner Project (3GPP) decided to conduct a search for the new air interface technology (New Wireless, NR).

In existing cellular wireless communication systems (such as Long Term Evolution (LTE)), uplink and downlink data transmissions are based on central scheduling. That is, the wireless resources occupied by the downlink transmission from each base station to a user equipment (UE) and the modulation and coding schemes are allocated by the base station. The wireless resources occupied by the uplink transmission from each user equipment to the base station and the modulation and coding schemes are also pre-allocated by the base station. These uplink and downlink scheduling information is carried in Downlink Control Information (DCI). The uplink and downlink transmission modes by way of allocating resources through the center (base station) may be collectively referred to as Grant-based uplink and downlink transmission.

In the next generation of wireless cellular networks (such as 5G NR, further evolution of LTE, further evolution of Narrow Band Internet of Things (NB-IoT)), the data transmission that only supports Grant-based transmission is unable to meet the increasingly diverse needs of the application. Especially for uplink transmission, in the scenario with high requirement for low latency or capacity, for example, Ultra Reliable Low Latency Communication (URLLC) has very strict delay requirements, Machine Type Communication (mMTC) or NB-IoT, or the application scenario of enhanced Machine Type Communication (eMTC) has high requirement for the system capacity, the grant-based approach cannot meet the requirements of the scenario due to the scheduling delay and the limitation of the overhead of the transmission-initiated overhead. Therefore, in contrast to the grant-based approach, uplink transmissions can be completed by a Grant-free manner. The Grant-free uplink transmissions does not require the wireless resources occupied by the transmission and/or modulation and coding scheme dynamically allocated by the base station before starting the uplink transmission. Therefore, this reduces the overhead required for transmission and for initiating transmissions.

SUMMARY

In the process of Grant-free uplink transmission, collision may occur due to lack of centralized dynamic scheduling and resource coordination. When a Grant-free uplink transmission also includes a preamble transmission, the transmission of the preamble may also collide. However, since the preamble is generally generated by sequences having a very low correlation with each other, even if a collision occurs, as long as the time at which the preamble arrives at the receiver is different, the receiver can still distinguish the transmission of the different user equipment from the preamble. If the associated Grant-free data transmission still collides, eventually it may result in the uplink transmission not being successfully received and decoded.

On the other hand, even if the Grant-free uplink transmission does not include the preamble transmission, when there are multiple receivers (such as multiple TRPs), it is likely that the uplink transmission may be received by a non-target receiver, resulting in link performance degradation or false alarms, or also increasing the complexity of the receiver.

The present disclosure provides a solution to the above-described problem of performance degradation due to collisions in the Grant-free uplink transmission. The solution achieves the purpose of reducing collision and/or reducing receiver complexity by distinguishing uplink synchronization time for the wireless resources of the uplink transmission. It should be noted that, in the case of no conflict, the embodiments in the user equipment (UE) and the features in the embodiments of the present disclosure can be applied to the base station, and vice versa. Further, in case of no conflicts, the embodiments of the present disclosure and the features of the embodiments may be arbitrarily combined with each other.

The present disclosure provides method for wireless communication in a user equipment (UE), comprising:

transmitting a first wireless signal; and

transmitting a second wireless signal;

wherein the first wireless signal is generated by a first sequence; the first wireless signal is used to determine a first time interval; the first time interval is a time interval between a first time instant and a second time instant; the first time instant is a starting time instant at which a transmitter of the first wireless signal transmits the first wireless signal; the second time instant is a starting time instant at which a transmitter of the second wireless signal transmits the second wireless signal; the first time instant is earlier than the second time instant; the second wireless signal occupies a first wireless resource; the first wireless resource is one of J candidate wireless resources; the J is a positive integer; the first time interval is used to determine the first wireless resource out of the J candidate wireless resources.

In one embodiment of the method for wireless communication in a user equipment, the first wireless resource in the J candidate wireless resource(s) is determined based on the first time interval (or TA value) such that the uplink transmission in different uplink synchronization time range may use different wireless resources. Therefore, the possibility of collision of the second wireless signals can be reduced in the case where the first wireless signal collides, and system performance can be improved.

In one embodiment, distinguishing different wireless resources for the second wireless signal by using the uplink synchronization time range may ensure that the second wireless signal is received by a target receiver, thereby improving link performance and reducing false alarm probability.

In one embodiment, the first sequence is a Zadoff-Chu (ZC) sequence.

In one embodiment, the first sequence is part of a ZC sequence.

In one embodiment, the first sequence is a sequence that is extended based on a ZC sequence.

In one embodiment, the first sequence is a sequence obtained by transforming based on a ZC sequence.

In one embodiment, the first sequence is a pseudo-random sequence or the first sequence is part of a pseudo-random sequence.

In one embodiment, the first sequence is an m sequence.

In one embodiment, the first sequence is a sequence in which all elements are the same.

In one embodiment, the transmission channel corresponding to the first wireless signal is a Random Access Channel (RACH).

In one embodiment, the transmission channel corresponding to the first wireless signal is a Physical Random Access Channel (PRACH).

In one embodiment, the transmission channel corresponding to the first wireless signal is a Narrow band Physical Random Access Channel (NPRACH).

In one embodiment, the first wireless signal is a signal generated based on a preamble.

In one embodiment, the first wireless signal is used by a base station to determine the first time interval.

In one embodiment, the first wireless signal is used by a Transmission Reception Point (TRP) to determine the first time interval.

In one embodiment, the first time interval is determined by a base station performing correlation on the first wireless signal.

In one embodiment, a transmission channel corresponding to the second wireless signal is an Uplink Shared Channel (UL-SCH).

In one embodiment, a physical channel corresponding to the second wireless signal is a Physical Uplink Shared Channel (PUSCH).

In one embodiment, a physical channel corresponding to the second wireless signal is a Narrow band Physical Uplink Shared Channel (NPUSCH).

In one embodiment, the second wireless signal carries Scheduling Request (SR) information.

In one embodiment, the first time interval is a positive number.

In one embodiment, the first time interval is a negative number.

In one embodiment, the unit of the first time interval is microsecond.

In one embodiment, the first time interval is represented by the number of unit time intervals.

In one embodiment, the first time interval comprises a difference between a positive integer number of Orthogonal Frequency Division Multiplexing (OFDM) symbols and a Timing Advance (TA).

In one embodiment, the receiver of the first wireless signal and the receiver of the second wireless signal are the same.

In one embodiment, the receiver of the first wireless signal and the receiver of the second wireless signal are different.

In one embodiment, the first wireless resource comprises at least one of time domain resource, frequency domain resource, code domain resource, and airspace resource.

In one embodiment, any two candidate wireless resources of the J candidate wireless resources are orthogonal, meaning that no resource element belongs to two wireless resources at the same time. The resource element is the smallest component of the wireless resource.

In one embodiment, any two candidate wireless resources of the J candidate wireless resources are orthogonal, meaning that no RU belongs to two wireless resources at the same time. The wireless resource refers to a time-frequency resource. The RU occupies one subcarrier in frequency domain, and the RU occupies one OFDM symbol in time domain.

In one embodiment, any two candidate wireless resources of the J candidate wireless resources are orthogonal, meaning that no code is used for two wireless resources at the same time. The wireless resource refers to a code domain resource.

In one embodiment, two candidate wireless resources of the J candidate wireless resources are non-orthogonal.

In one embodiment, the number of the resource elements in any two candidate wireless resources of the J candidate wireless resources is the same.

In one embodiment, the number of the resource elements in two candidate wireless resources of the J candidate wireless resources is different.

In one embodiment, the first time interval is used by the UE to determine the first wireless resource out of the J candidate wireless resources.

In one embodiment, the first time interval is used by a base station to determine the first wireless resource out of the J candidate wireless resources.

In one embodiment, the first time interval is used by the TRP to determine the first wireless resource out of the J candidate wireless resources.

In one embodiment, the first time interval determines the first wireless resource out of the J candidate wireless resources by using a pre-determined mapping relationship.

In one embodiment of the method for wireless communication in a user equipment, the J candidate wireless resource(s) correspond(s) to P time interval range(s); any two time interval ranges of the P time interval ranges do not overlap; the P is a positive integer; the first time interval belongs to a target time interval range; the target time interval range is a time interval range of the P time interval ranges; the target time interval range corresponds to K candidate wireless resource(s) out of the J candidate wireless resources; the first wireless resource is one of the K candidate wireless resource(s); the K is a positive integer smaller than or equal to the J.

In one embodiment, one time interval range refers to a continuous range of one time interval.

In one embodiment, the phrase that any two time interval ranges of the P time interval ranges do not overlap refers to no time interval belongs to two the time interval ranges.

In one embodiment, the J candidate wireless resources correspond to the P time interval ranges based on a pre-determined mapping relationship.

In one embodiment, two candidate wireless resources in the J candidate wireless resources correspond to one same time interval range of the P time interval ranges.

In one embodiment, any two candidate wireless resources in the J candidate wireless resources correspond to two different time interval ranges of the P time interval ranges.

In one embodiment, the J is equal to the P.

In one embodiment, the J is equal to the P, and the J candidate wireless resources are in one-to-one correspondence to the P time interval intervals.

In one embodiment, the interval lengths of any two time interval ranges of the P time interval ranges are the same.

In one embodiment, the interval lengths of two time interval ranges of the P time interval ranges are different.

In one embodiment, the P is equal to 2.

In one embodiment, the P is a positive integer greater than 2.

In one embodiment, the P is predefined.

In one embodiment, the P is configured through a network.

In one embodiment, the K is equal to 1.

In one embodiment, the K is a positive integer greater than 1.

In one embodiment, the method for wireless communication in a user equipment further comprises:

receiving a first signaling;

wherein the first wireless signaling is used to determine Q wireless resource pool(s); the Q is a positive integer; each candidate wireless resource of the J candidate wireless resources belongs to one of the Q wireless resource pool(s); the K candidate wireless resource(s) belongs (belong) to a first wireless resource pool the first wireless resource pool is one of the Q wireless resource pool(s); the first time interval is used to determine the first wireless resource pool out of the Q wireless resource pool(s).

In one embodiment, the wireless resource pool includes a positive integer number of Physical Resource Blocks (PRB) in frequency domain.

In one embodiment, the wireless resource pool includes a positive integer number of Resource Block Groups (RBG) in frequency domain.

In one embodiment, the number of the wireless resource elements in any two wireless resource pools of the Q wireless resource pools is the same.

In one embodiment, the number of the wireless resource elements in two wireless resource pools of the Q wireless resource pools is different.

In one embodiment, the J is greater than the Q.

In one embodiment, the J is less than the Q.

In one embodiment, the J is equal to the Q.

In one embodiment, the J is equal to the Q, and the J candidate wireless resources belong to the Q wireless resource pools.

In one embodiment, the J is equal to the Q, and the J candidate wireless resources belong to the Q wireless resource pools. The J candidate wireless resources are the Q wireless resource pools.

In one embodiment, the first wireless signaling is used by the UE to determine the Q wireless resource pool(s).

In one embodiment, the first wireless signaling explicitly indicates the Q wireless resource pool(s).

In one embodiment, the first wireless signaling implicitly indicates the Q wireless resource pool(s).

In one embodiment, the first wireless signaling includes default value(s) of the Q wireless resource pool(s).

In one embodiment, the first wireless signaling is a higher layer signaling.

In one embodiment, the first wireless signaling is a physical layer signaling.

In one embodiment, the first wireless signaling is a Wireless Resource Control (RRC) signaling.

In one embodiment, the first wireless signaling is Downlink Control Information (DCI).

In one embodiment, the K candidate wireless resource(s) belongs (belong) to a first wireless resource pool the first wireless resource pool is one wireless resource pool of the Q wireless resource pool(s); the first time interval is used to determine the first wireless resource pool in the Q wireless resource pool(s).

In one embodiment, the first time interval is used by the UE to determine the first resource pool in the Q wireless resource pool(s).

In one embodiment, the first time interval is used by the base station to determine the first resource pool in the Q wireless resource pool(s).

In one embodiment, the first time interval is used by the TRP to determine the first resource pool in the Q wireless resource pool(s).

In one embodiment, the K is equal to 1.

In one embodiment, the K is a positive integer greater than 1.

In one embodiment, the first time interval determines the first resource pool in the Q wireless resource pool(s) by using the specific mapping relationship.

In one embodiment, the method for wireless communication in a user equipment further comprises:

receiving a second wireless signaling;

wherein the second wireless signaling is used to determine the first time interval.

In one embodiment, the second wireless signaling indicates a portion of the first time interval.

In one embodiment, the first time interval is equal to a sum of a known time interval and an offset value. The offset value is positive; or the offset value is negative. The second wireless signaling indicates the offset value.

In one embodiment, the second wireless signaling explicitly indicates the first time interval.

In one embodiment, the second wireless signaling implicitly indicates the first time interval.

In one embodiment, the second wireless signaling includes a default value of the first time interval.

In one embodiment, the second wireless signaling is a high layer signaling.

In one embodiment, the second wireless signaling is a physical layer signaling.

In one embodiment, the second wireless signaling is a Medium Access Control (MAC) signaling.

In one embodiment, the second wireless signaling is a Wireless Resource Control (RRC) signaling.

In one embodiment, the second wireless signaling is a Downlink Control Information (DCI).

In one embodiment, the second wireless signaling is transmitted through a Downlink Shared Channel (DL-SCH).

In one embodiment of the method for wireless communication in a user equipment, the first wireless signal is used to determine whether the second wireless signal is transmitted or not.

In one embodiment, the first wireless signal is used by a Transmission Reception Point (TRP) to determine whether the second wireless signal is transmitted or not.

In one embodiment, the first wireless signal is used by a Transmission Reception Point (TRP) to determine whether the second wireless signal is transmitted or not.

In one embodiment, whether the second wireless signal is transmitted or not is determined by a base station performing correlation on the first wireless signal.

In one embodiment, when the associated peak of the first wireless signal after performing correlation exceeds a given threshold, the base station determines that the second wireless signal is transmitted.

In one embodiment of the method for wireless communication in a user equipment, the first sequence belongs to a target sequence set; the first wireless signal occupies a target time-frequency resource; at least one of an index of the first sequence in the target sequence set, a location of the target time-frequency resource in time domain, a location of the target time-frequency resource in frequency domain, or a correspondence relationship between the location of the target time-frequency resource in time domain and the location of the target time-frequency resource in frequency domain is used to determine the first wireless resource out of the J candidate wireless resources.

In one embodiment, the target sequence set only includes the first sequence.

In one embodiment, the target sequence set includes the first sequence and a sequence other than the first sequence.

In one embodiment, any one of the target sequence sets is a ZC sequence.

In one embodiment, the target time-frequency resource is continuous in time domain.

In one embodiment, the target time-frequency resource is discrete in time domain.

In one embodiment, the target time-frequency resource is continuous in frequency domain.

In one embodiment, the target time-frequency resource is discrete in frequency domain.

In one embodiment, the target time-frequency resource is packet hopping in frequency domain.

In one embodiment, the target time-frequency resource is two-stage packet hopping in frequency domain.

In one embodiment, the index of the first sequence in the target sequence set is an index for which the sequences in the target sequence set are sorted by a specific order.

In one embodiment, the location of the target time-frequency resource in time domain refers to a subframe number occupied by the target time-frequency resource.

In one embodiment, the location of the target time-frequency resource in time domain refers to a wireless frame number occupied by the target time-frequency resource.

In one embodiment, the location of the target time-frequency resource in time domain refers to a slot number occupied by the target time-frequency resource.

In one embodiment, the location of the target time-frequency resource in frequency domain refers to an index of a PRB occupied by the target time-frequency resource.

In one embodiment, the location of the target time-frequency resource in frequency domain refers to an absolute frequency of the target time-frequency resource.

In one embodiment, the corresponding relationship between the location of the target time-frequency resource in time domain and the location of the target time-frequency resource in frequency domain refers to a frequency hopping pattern in the target time-frequency resource.

In one embodiment, at least one of an index of the first sequence in the target sequence set, a location of the target time-frequency resource in time domain, a location of the target time-frequency resource in frequency domain, or a correspondence relationship between the location of the target time-frequency resource in time domain and the location of the target time-frequency resource in frequency domain is used by the UE to determine the first wireless resource out of the J candidate wireless resources.

In one embodiment, at least one of an index of the first sequence in the target sequence set, a location of the target time-frequency resource in time domain, a location of the target time-frequency resource in frequency domain, or a correspondence relationship between the location of the target time-frequency resource in time domain and the location of the target time-frequency resource in frequency domain is used by the base station to determine the first wireless resource out of the J candidate wireless resources.

In one embodiment, at least one of an index of the first sequence in the target sequence set, a location of the target time-frequency resource in time domain, a location of the target time-frequency resource in frequency domain, or a correspondence relationship between the location of the target time-frequency resource in time domain and the location of the target time-frequency resource in frequency domain is used to determine the first wireless resource out of the J candidate wireless resources through a pre-determined mapping relationship

In one embodiment, the first wireless resource is determined by using the following formula in the J candidate wireless resources:
Iresource=(Ipreamble+ITA)mod Nresource

wherein, Iresource is an index of the first wireless resource in the J candidate wireless resources, Nresource=J is the quantity of the candidate wireless resources, Ipreamble represents an index of the first sequence, and ITA representative an index of the target time interval range in the P time interval ranges.

The present disclosure provides a method for wireless communication in a base station, comprising:

receiving a first wireless signal; and

receiving a second wireless signal;

wherein the first wireless signal is generated by a first sequence; the first wireless signal is used to determine a first time interval; the first time interval is a time interval between a first time instant and a second time instant; the first time instant is a starting time instant at which a transmitter of the first wireless signal transmits the first wireless signal; the second time instant is a starting time instant at which a transmitter of the second wireless signal transmits the second wireless signal; the first time instant is earlier than the second time instant; the second wireless signal occupies a first wireless resource; the first wireless resource is one of J candidate wireless resources; the J is a positive integer; the first time interval is used to determine the first wireless resource out of the J candidate wireless resources.

In one embodiment of the method for wireless communication in a base station, the J candidate wireless resource(s) correspond(s) to P time interval range(s); any two time interval ranges of the P time interval ranges do not overlap; the P is a positive integer; the first time interval belongs to a target time interval range; the target time interval range is a time interval range of the P time interval ranges; the target time interval range corresponds to K candidate wireless resource(s) out of the J candidate wireless resources; the first wireless resource is one of the K candidate wireless resource(s); the K is a positive integer smaller than or equal to the J.

In one embodiment of the method for wireless communication in a base station, the method further comprises:

transmitting a first signaling;

wherein the first wireless signaling is used to determine Q wireless resource pool(s); the Q is a positive integer; each candidate wireless resource of the J candidate wireless resources belongs to one of the Q wireless resource pool(s).

In one embodiment of the method for wireless communication in a base station, the K candidate wireless resource(s) belongs (belong) to a first wireless resource pool the first wireless resource pool is one of the Q wireless resource pool(s); the first time interval is used to determine the first wireless resource pool out of the Q wireless resource pool(s).

In one embodiment of the method for wireless communication in a base station, the method further comprises:

transmitting a second wireless signaling;

wherein the second wireless signaling is used to determine the first time interval.

In one embodiment of the method for wireless communication in a base station, the first wireless signal is used to determine whether the second wireless signal is transmitted or not.

In one embodiment of the method for wireless communication in a base station, the first sequence belongs to a target sequence set; the first wireless signal occupies a target time-frequency resource; at least one of an index of the first sequence in the target sequence set, a location of the target time-frequency resource in time domain, a location of the target time-frequency resource in frequency domain, or a correspondence relationship between the location of the target time-frequency resource in time domain and the location of the target time-frequency resource in frequency domain is used to determine the first wireless resource out of the J candidate wireless resources.

The present disclosure provides a user equipment for wireless communication, comprising:

a first processor transmitting a first wireless signal; and

a first transmitter transmitting a second wireless signal;

wherein the first wireless signal is generated by a first sequence; the first wireless signal is used to determine a first time interval; the first time interval is a time interval between a first time instant and a second time instant; the first time instant is a starting time instant at which a transmitter of the first wireless signal transmits the first wireless signal; the second time instant is a starting time instant at which a transmitter of the second wireless signal transmits the second wireless signal; the first time instant is earlier than the second time instant; the second wireless signal occupies a first wireless resource; the first wireless resource is one of J candidate wireless resources; the J is a positive integer; the first time interval is used to determine the first wireless resource out of the J candidate wireless resources.

In one embodiment of the user equipment for wireless communication, the J candidate wireless resource(s) correspond(s) to P time interval range(s); any two time interval ranges of the P time interval ranges do not overlap; the P is a positive integer; the first time interval belongs to a target time interval range; the target time interval range is a time interval range of the P time interval ranges; the target time interval range corresponds to K candidate wireless resource(s) out of the J candidate wireless resources; the first wireless resource is one of the K candidate wireless resource(s); the K is a positive integer smaller than or equal to the J.

In one embodiment of the user equipment for wireless communication, the first processor receives a first signaling; wherein the first wireless signaling is used to determine Q wireless resource pool(s); the Q is a positive integer; each candidate wireless resource of the J candidate wireless resources belongs to one of the Q wireless resource pool(s).

In one embodiment of the user equipment for wireless communication, the K candidate wireless resource(s) belongs (belong) to a first wireless resource pool the first wireless resource pool is one of the Q wireless resource pool(s); the first time interval is used to determine the first wireless resource pool out of the Q wireless resource pool(s).

In one embodiment of the user equipment for wireless communication, the first processor further receives a second wireless signaling; wherein the second wireless signaling is used to determine the first time interval.

In one embodiment of the user equipment for wireless communication, the first wireless signal is used to determine whether the second wireless signal is transmitted or not.

In one embodiment of the user equipment for wireless communication, the first sequence belongs to a target sequence set; the first wireless signal occupies a target time-frequency resource; at least one of an index of the first sequence in the target sequence set, a location of the target time-frequency resource in time domain, a location of the target time-frequency resource in frequency domain, or a correspondence relationship between the location of the target time-frequency resource in time domain and the location of the target time-frequency resource in frequency domain is used to determine the first wireless resource out of the J candidate wireless resources.

The present disclosure provides a base station for wireless communication, comprising:

a second processor transmitting a first wireless signal; and

a first receiver transmitting a second wireless signal;

wherein the first wireless signal is generated by a first sequence; the first wireless signal is used to determine a first time interval; the first time interval is a time interval between a first time instant and a second time instant; the first time instant is a starting time instant at which a transmitter of the first wireless signal transmits the first wireless signal; the second time instant is a starting time instant at which a transmitter of the second wireless signal transmits the second wireless signal; the first time instant is earlier than the second time instant; the second wireless signal occupies a first wireless resource; the first wireless resource is one of J candidate wireless resources; the J is a positive integer; the first time interval is used to determine the first wireless resource out of the J candidate wireless resources.

In one embodiment of the base station for wireless communication, the J candidate wireless resource(s) correspond(s) to P time interval range(s); any two time interval ranges of the P time interval ranges do not overlap; the P is a positive integer; the first time interval belongs to a target time interval range; the target time interval range is a time interval range of the P time interval ranges; the target time interval range corresponds to K candidate wireless resource(s) out of the J candidate wireless resources; the first wireless resource is one of the K candidate wireless resource(s); the K is a positive integer smaller than or equal to the J.

In one embodiment of the base station for wireless communication, the second processor transmits a first signaling; wherein the first wireless signaling is used to determine Q wireless resource pool(s); the Q is a positive integer; each candidate wireless resource of the J candidate wireless resources belongs to one of the Q wireless resource pool(s).

In one embodiment of the base station for wireless communication, the K candidate wireless resource(s) belongs (belong) to a first wireless resource pool the first wireless resource pool is one of the Q wireless resource pool(s); the first time interval is used to determine the first wireless resource pool out of the Q wireless resource pool(s).

In one embodiment of the base station for wireless communication, the second processor further transmits a second wireless signaling; wherein the second wireless signaling is used to determine the first time interval.

In one embodiment of the base station for wireless communication, the first wireless signal is used to determine whether the second wireless signal is transmitted or not.

In one embodiment of the base station for wireless communication, the first sequence belongs to a target sequence set; the first wireless signal occupies a target time-frequency resource; at least one of an index of the first sequence in the target sequence set, a location of the target time-frequency resource in time domain, a location of the target time-frequency resource in frequency domain, or a correspondence relationship between the location of the target time-frequency resource in time domain and the location of the target time-frequency resource in frequency domain is used to determine the first wireless resource out of the J candidate wireless resources.

Compared with the prior art, the present disclosure has the following technical advantages.

In the case of a preamble transmission collision, it is possible that the base station side can still correctly receive and decode the uplink data, thereby improving the capacity of the entire system.

The ambiguity of uplink transmission between multiple uplink receiving nodes is avoided, thereby improving link performance, reducing false alarm probability, and reducing receiver complexity.

