CN108574983B

CN108574983B - Uplink transmission method and device

Info

Publication number: CN108574983B
Application number: CN201710155161.1A
Authority: CN
Inventors: 黄曲芳; 徐小英
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-03-14
Filing date: 2017-03-14
Publication date: 2020-04-03
Anticipated expiration: 2037-03-14
Also published as: WO2018166471A1; CN108574983A

Abstract

The embodiment of the invention provides an uplink transmission method and device, relates to the technical field of communication, and aims to improve the probability of correctly receiving uplink data by wireless access equipment under various air interface formats so as to improve the uplink transmission efficiency in an NR system. The method comprises the following steps: the UE determines the starting time of an uplink transmission time unit for uplink transmission according to the used TA quantity; the UE at least determines a target air interface format required by the uplink transmission from a first air interface format and a second air interface format, wherein the length of a symbol in the first air interface format is greater than that of a symbol in the second air interface format, and the first TA effective duration of the TA quantity in the first air interface format is greater than the second TA effective duration of the TA quantity in the second air interface format; and when the starting time of the uplink transmission time unit arrives, if the effective time length of the TA corresponding to the target air interface format is not finished, the UE executes the uplink transmission by using the target air interface format.

Description

Uplink transmission method and device

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to an uplink transmission method and device.

Background

In a Long Term Evolution (LTE) system, each User Equipment (UE) in a cell may synchronize with a radio access device (e.g., a base station) by a Timing Advance (TA) amount, so as to determine a time when the UE transmits an uplink subframe during uplink transmission. As shown in fig. 1, the UE determines that the time of the downlink subframe 1 sent by the base station is T1, the UE forwards offsets according to the TA amount to determine the start time T2 of sending the uplink subframe 2 to the base station, and then, when the time T2 arrives, the UE may uplink transmit with the base station through the uplink subframe 2. However, a certain transmission delay exists between the base station and the UE, and if the base station does not receive the uplink subframe 2 within a certain time, the uplink data sent by the UE through the uplink subframe 2 cannot be correctly received.

Since the distance between the UE and the base station is changed in real time, in order to ensure that the base station can correctly receive the uplink subframe 2 sent by the UE as much as possible, an effective duration of a TA amount may be set in each uplink transmission process, for example, each time the UE updates the TA amount used by the UE, a Timing Advance Timer (TAT) is started, as shown in fig. 1, so that when the time T2 arrives, the UE is allowed to uplink transmit with the base station through the uplink subframe 2 only in a state that the TAT is not yet overtime, that is, the TA amount currently used is effective.

In a New Radio (NR) defined in the fifth generation mobile communication system, a cell may have configuration parameters of various air interface formats, such as a numerology parameter (numerology). By setting these configuration parameters, the length of symbols (symbols) in different air interface formats can be different. For example, as shown in fig. 2, the length of one symbol in the air interface format 1 is the length of 4 symbols in the air interface format 2. Since the configuration parameters under different air interface formats may be different, how to use the different air interface formats for effective uplink transmission becomes an urgent problem to be solved.

Disclosure of Invention

Embodiments of the present invention provide an uplink transmission method and apparatus, which can improve the probability of correctly receiving uplink data by a wireless access device under multiple air interface formats, so as to improve uplink transmission efficiency in an air interface of a fifth generation mobile communication system.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

in a first aspect, an embodiment of the present invention provides an uplink transmission method, including: the UE determines the starting time of an uplink transmission time unit for uplink transmission according to the TA quantity used by the UE; furthermore, the UE may determine a target air interface format required for performing the uplink transmission at least from a first air interface format and a second air interface format (where a length of a symbol in the first air interface format is greater than a length of a symbol in the second air interface format), where a first TA valid duration of the TA amount in the first air interface format is greater than a second TA valid duration of the TA amount in the second air interface format; then, when the starting time of the uplink transmission time unit arrives, if the TA valid duration corresponding to the target air interface format is not finished, that is, the TA amount is still valid in the target air interface format, the UE may use the target air interface format to perform the current uplink transmission.

In the embodiment of the present invention, the effective time of the TA amount updated each time in the second air interface format is set to be shorter, and the effective time of the TA amount updated each time in the first air interface format is set to be longer. This is because the CP time window in the second air interface format with a shorter symbol length is smaller than the CP time window in the first air interface format with a longer symbol length, and when the second TA effective duration corresponding to the second air interface format is shorter, the UE transmits the uplink transmission time unit using the second air interface format, which can improve the probability that the uplink transmission time unit received by the wireless access device falls into its CP time window. And the CP time window in the first air interface format is larger, so that when the first TA valid duration corresponding to the first air interface format is longer, the probability that the uplink transmission time unit received by the wireless access device falls into the CP time window is still higher. Therefore, the probability that the wireless access equipment correctly receives the uplink transmission time unit can be improved while the TA quantity is not updated frequently, and the uplink transmission efficiency in the NR system is improved.

Based on the first aspect, in a first possible implementation manner of the first aspect, when the starting time of the uplink transmission time unit arrives, the method further includes: if the TA valid duration corresponding to the target air interface format is finished, that is, the TA amount is invalid in the target air interface format, the UE may cancel the uplink transmission.

Based on the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, when the first TA validity duration is not ended and the second TA validity duration is ended, the UE releases the uplink configuration resource configured on the second air interface format, where the uplink configuration resource includes at least one of a PUCCH resource, an SRS resource, a HARQ feedback resource, and a PUSCH resource. Therefore, after the effective time duration of the second TA is over, the UE can be prevented from using the uplink configuration resources to execute uplink transmission, and the risk that the uplink transmission time unit received by the wireless access equipment falls outside the CP time window is reduced.

Based on any one implementation manner of the first aspect to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the target air interface format is a second air interface format, and a TA valid duration corresponding to the target air interface format is a second TA valid duration, where when the first TA valid duration is not ended and the second TA valid duration is ended, the method further includes: and the UE sends first indication information to the wireless access equipment by using the first air interface format, wherein the first indication information is used for informing the wireless access equipment that the effective time length of the second TA is finished. Then, after receiving the first indication information, the radio access device may send a command for updating the TA amount used by the UE to the UE again, so as to trigger the UE to re-determine the starting time of the uplink transmission time unit and start timing, at this time, the second TA valid duration must not end, and the UE may use the second air interface format (i.e., the target air interface format) to perform a new uplink transmission.

Based on any one of the first aspect to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, when the first TA validity duration ends and the second TA validity duration ends, the UE releases the uplink configuration resource configured on the first air interface format, where the uplink configuration resource includes at least one of a PUCCH resource, an SRS resource, a HARQ feedback resource, and a PUSCH resource. Therefore, after the effective time length of the first TA is over, the UE still uses the uplink configuration resources to perform uplink transmission with the wireless access equipment, and the risk that the uplink transmission time unit received by the wireless access equipment falls outside the CP time window is reduced.

Based on any one of the first aspect to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, when the first TA validity period ends, and the second TA validity period ends, the method further includes: the UE initiates random access to the wireless access device in a third air interface format (the third air interface format is any one of air interface format sets to which an LCH of the uplink data to be transmitted belongs), so as to establish a connection relationship between the UE and the wireless access device.

Based on the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the UE determines, according to the priority of the LCH on each air interface format in the air interface format set, one air interface format from the air interface format set as the third air interface format.

Based on the fifth or sixth possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the UE receives second indication information sent by the wireless access device, where the second indication information includes an index of at least one fourth air interface format, and the fourth air interface format is any air interface format except the third air interface format; the UE initiates random access to the wireless access device on the at least one fourth air interface format. Therefore, the random access initiated by the UE can be dispersed into other multiple air interface formats, so that the collision phenomenon caused by the fact that multiple UEs simultaneously send the random access in the same air interface format is reduced.

Based on the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, the initiating, by the UE, random access to the wireless access device on the at least one fourth air interface format includes: the UE determines, from the at least one fourth air interface format, an air interface format that meets a random access condition, where the random access condition includes at least one of the at least one air interface format supported by the UE and a bandwidth range supported by the UE; and the UE initiates random access to the wireless access equipment on an air interface format meeting the random access condition.

Based on any one implementation manner of the first aspect to the eighth possible implementation manner of the first aspect, in a ninth possible implementation manner of the first aspect, when an instruction for updating the amount of TA used by the UE is obtained, the UE starts a first time advance timer TAT corresponding to a first air interface format and a second TAT corresponding to a second air interface format, where a timing duration of the first TAT is a first TA valid duration, and a timing duration of the second TAT is a second TA valid duration.

Based on any one of the first aspect to the ninth possible implementation manner of the first aspect, in a tenth possible implementation manner of the first aspect, the UE receives configuration information sent by the radio access device, where the configuration information includes a correspondence between a first air interface format and a first TA valid duration, and a correspondence between a second air interface format and a second TA valid duration.

In a second aspect, an embodiment of the present invention provides a random access method, including: the UE initiates random access to the wireless access equipment on a first air interface format; the UE receives indication information sent by the wireless access equipment, wherein the indication information comprises an index of at least one candidate air interface format, and the candidate air interface format is any air interface format except the first air interface format; and then, the UE initiates random access to the wireless access equipment on at least one candidate air interface format.

Based on the second aspect, in a first possible implementation manner of the second aspect, the initiating, by the UE, random access to the radio access device on at least one candidate air interface format includes: the UE determines an air interface format meeting random access conditions from at least one candidate air interface format, wherein the random access conditions comprise at least one air interface format supported by the UE and at least one bandwidth range supported by the UE; and the UE initiates random access to the wireless access equipment on the air interface format meeting the random access condition.

In a third aspect, an embodiment of the present invention provides an uplink transmission method, including: the method comprises the steps that the wireless access equipment determines a first TA effective duration of a TA amount under a first air interface format and a second TA effective duration of the TA amount under a second air interface format for UE, wherein the length of a symbol in the first air interface format is larger than that of a symbol in the second air interface format, and the first TA effective duration is larger than that of the second TA effective duration; the wireless access equipment sends configuration information to the UE, wherein the configuration information carries a corresponding relation between the first air interface format and the first TA effective duration and a corresponding relation between the second air interface format and the second TA effective duration.

Based on the third aspect, in a first possible implementation manner of the third aspect, when the first TA valid duration is not ended and the second TA valid duration is ended, the method further includes: the wireless access device receives first indication information sent by the UE, where the first indication information is used to notify the wireless access device that the second TA validity duration has ended.

Based on the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, when the first TA validity period ends and the second TA validity period ends, the method further includes: the wireless access device establishes a connection with the UE through random access over a first air interface format.

Based on the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the method further includes: and the wireless access equipment sends second indication information to the UE, wherein the second indication information comprises an index of at least one candidate air interface format, and the candidate air interface format is any air interface format except the first air interface format.

In a fourth aspect, an embodiment of the present invention provides a UE, including: a determination unit configured to: determining the starting time of an uplink transmission time unit for uplink transmission according to the used TA amount; determining a target air interface format required by the uplink transmission at least from a first air interface format and a second air interface format, wherein the length of a symbol in the first air interface format is greater than that of a symbol in the second air interface format, and the first TA effective duration of the TA quantity in the first air interface format is greater than the second TA effective duration of the TA quantity in the second air interface format; an execution unit to: and when the starting time of the uplink transmission time unit arrives, if the TA effective duration corresponding to the target air interface format is not finished, executing the uplink transmission by using the target air interface format.

Based on the fourth aspect, in a first possible implementation manner of the fourth aspect, the execution unit is further configured to: and when the starting time of the uplink transmission time unit arrives, if the TA effective duration corresponding to the target air interface format is ended, cancelling the uplink transmission.

Based on the fourth aspect or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the execution unit is further configured to: and when the first TA effective duration is not finished and the second TA effective duration is finished, releasing the configured uplink configuration resources on the second air interface format, wherein the uplink configuration resources comprise at least one of PUCCH resources, SRS resources, HARQ feedback resources and PUSCH resources.

Based on any one implementation manner of the second possible implementation manner of the fourth aspect to the fourth aspect, in a third possible implementation manner of the fourth aspect, the target air interface format is a second air interface format, a TA valid duration corresponding to the target air interface format is a second TA valid duration, and the UE further includes: a transmitting unit configured to: and when the first TA effective duration is not finished and the second TA effective duration is finished, sending first indication information to the wireless access equipment by using a first air interface format, wherein the first indication information is used for informing the wireless access equipment that the second TA effective duration is finished.

Based on any one implementation manner of the fourth aspect to the third possible implementation manner of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the execution unit is further configured to: and when the first TA effective duration is finished and the second TA effective duration is finished, releasing the configured uplink configuration resources on the first air interface format, wherein the uplink configuration resources comprise at least one of PUCCH resources, SRS resources, HARQ feedback resources and PUSCH resources.

In a fifth possible implementation manner of the fourth aspect, based on any one of the fourth possible implementation manners of the fourth aspect to the fourth aspect, the UE further includes: a random access unit configured to: and when the first TA effective duration is finished and the second TA effective duration is finished, initiating random access to the wireless access equipment in a third air interface format, wherein the third air interface format is any one of air interface format sets to which a Logic Channel (LCH) of the uplink data to be transmitted belongs.

Based on the fifth possible implementation manner of the fourth aspect, in a sixth possible implementation manner of the fourth aspect, the determining unit is further configured to: and determining one of the air interface format sets as the third air interface format according to the priority of the LCH on each air interface format in the air interface format set.

Based on the fifth or sixth possible implementation manner of the fourth aspect, in a seventh possible implementation manner of the fourth aspect, the UE further includes an obtaining unit, where the obtaining unit is configured to receive second indication information sent by the wireless access device, where the second indication information includes an index of at least one fourth air interface format, and the fourth air interface format is any air interface format except the third air interface format; the random access unit is further configured to: initiating random access to the wireless access device on the at least one fourth air interface format.

Based on the seventh possible implementation manner of the fourth aspect, in an eighth possible implementation manner of the fourth aspect, the determining unit is further configured to: determining an air interface format meeting random access conditions from the at least one fourth air interface format, wherein the random access conditions comprise at least one air interface format supported by the UE and at least one bandwidth range supported by the UE; the random access unit is specifically configured to: and initiating random access to the wireless access equipment on the air interface format meeting the random access condition.

Based on any one of the eighth possible implementation manners of the fourth aspect to the fourth aspect, in a ninth possible implementation manner of the fourth aspect, when the instruction for updating the TA amount used by the UE is acquired, the execution unit is further configured to: and starting a first time advance timer TAT corresponding to the first air interface format and a second TAT corresponding to the second air interface format, wherein the timing duration of the first TAT is the effective duration of the first TA, and the timing duration of the second TAT is the effective duration of the second TA.

Based on any one implementation manner of the ninth possible implementation manner of the fourth aspect to the fourth aspect, in a tenth possible implementation manner of the fourth aspect, the obtaining unit is further configured to: and receiving configuration information sent by the wireless access equipment, wherein the configuration information comprises a corresponding relation between a first air interface format and the first TA effective duration and a corresponding relation between a second air interface format and the second TA effective duration.

In a fifth aspect, an embodiment of the present invention provides a wireless access device, including: a determining unit, configured to determine, for the UE, a first TA valid duration of a TA amount in a first air interface format and a second TA valid duration of the TA amount in a second air interface format, where a length of a symbol in the first air interface format is greater than a length of a symbol in the second air interface format, and the first TA valid duration is greater than the second TA valid duration; a transmission unit, configured to send configuration information to the UE, where the configuration information carries a correspondence between the first air interface format and the first TA valid duration, and a correspondence between the second air interface format and the second TA valid duration.

Based on the fifth aspect, in a first possible implementation manner of the fifth aspect, the transmission unit is further configured to: and when the first TA valid duration is not finished and the second TA valid duration is finished, receiving first indication information sent by the UE, wherein the first indication information is used for informing the wireless access equipment that the second TA valid duration is finished.

Based on the fifth aspect or the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, the transmission unit is further configured to: and when the first TA effective duration is finished and the second TA effective duration is finished, establishing connection with the UE through random access on a first air interface format.

Based on the second possible implementation manner of the fifth aspect, in a third possible implementation manner of the fifth aspect, the transmission unit is further configured to: and sending second indication information to the UE, wherein the second indication information comprises an index of at least one candidate air interface format, and the candidate air interface format is any air interface format except the first air interface format.

In a sixth aspect, an embodiment of the present invention provides a UE, including: a processor, a memory, a bus, and a communication interface; the memory is used for storing computer execution instructions, the processor is connected with the memory through the bus, and when the UE runs, the processor executes the computer execution instructions stored in the memory so as to enable the UE to execute any uplink transmission method.

In a seventh aspect, an embodiment of the present invention provides a wireless access device, including: a processor, a memory, a bus, and a communication interface; the memory is used for storing computer execution instructions, the processor is connected with the memory through the bus, and when the wireless access device runs, the processor executes the computer execution instructions stored in the memory, so that the wireless access device executes any one of the uplink transmission methods.

In an eighth aspect, an embodiment of the present invention provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on any one of the UEs, the instructions cause the UE to perform any one of the uplink transmission methods.

In a ninth aspect, an embodiment of the present invention provides a computer-readable storage medium, where the computer-readable storage medium stores instructions that, when executed on any one of the foregoing wireless access apparatuses, cause the wireless access apparatus to execute any one of the foregoing uplink transmission methods.

In a tenth aspect, an embodiment of the present invention provides a computer program product including instructions, which, when run on any one of the above UEs, causes the UE to perform any one of the above uplink transmission methods.

In an eleventh aspect, an embodiment of the present invention provides a computer program product containing instructions, which when run on any one of the above wireless access apparatuses, causes the wireless access apparatus to execute any one of the above uplink transmission methods.

In the embodiment of the present invention, the names of the UE and the radio access device described above do not limit the devices themselves, and in practical implementation, the devices may appear by other names. Provided that the functions of the respective devices are similar to those of the embodiments of the present invention, they are within the scope of the claims of the present invention and their equivalents.

In addition, the technical effects brought by any one of the design methods of the second aspect to the eleventh aspect can be referred to the technical effects brought by the different design methods of the first aspect, and are not described herein again.

Drawings

FIG. 1 is a diagram illustrating a scenario of TA usage in the prior art;

fig. 2 is a schematic diagram of different air interface formats in an NR system;

fig. 3 is a schematic system architecture diagram of an uplink transmission system according to an embodiment of the present invention;

fig. 4 is a schematic view of a usage scenario of TA amounts under different air interface formats in the prior art;

fig. 5 is a schematic view of an application scenario of an uplink transmission method according to an embodiment of the present invention;

fig. 6 is a first schematic structural diagram of a UE according to an embodiment of the present invention;

fig. 7 is a first schematic structural diagram of a wireless access device according to an embodiment of the present invention;

fig. 8 is a flowchart illustrating an uplink transmission method according to an embodiment of the present invention;

fig. 9 is a flowchart illustrating a random access method according to an embodiment of the present invention;

fig. 10 is a second schematic structural diagram of a UE according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a wireless access device according to an embodiment of the present invention;

fig. 12 is a third schematic structural diagram of a UE according to an embodiment of the present invention.

Detailed Description

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless otherwise specified.

An embodiment of the present invention provides an uplink transmission method, which may be applied to an uplink transmission system shown in fig. 3, where the system includes a wireless access device 11 and at least one user equipment 12.

The User Equipment (UE) 12 may also be referred to as a terminal, and specifically may be a mobile phone, a tablet Computer, a notebook Computer, an UMPC (Ultra-mobile Personal Computer), a netbook, a PDA (Personal Digital Assistant), a vehicle-mounted terminal in a vehicle networking, a radio frequency identifier in an internet of things, and the like.

The wireless Access device 11 may be an AP (Access Point), a base station (for example, a macro base station, a micro base station, a repeater, and the like), and the embodiment of the present invention does not limit this.

In addition, the transmission time unit related in the embodiment of the present invention may specifically include an uplink transmission time unit and a downlink transmission time unit. The uplink transmission time unit refers to a time granularity for uplink transmission, and the downlink transmission time unit refers to a time granularity for downlink transmission. The transmission time unit may be a subframe, a symbol (symbol), a slot (slot), a mini-slot, a converged slot or a converged minislot. Taking the subframe as an example, in an LTE system, the time length of one subframe is generally 1ms, and in an NR of 5G (5th-Generation, fifth Generation mobile communication system), the time length of one subframe may be set by a radio access device, which is not limited in this embodiment of the present invention.

In addition, in the NR system, a plurality of air interface formats may be configured in one cell by means of a numerology (numerology) parameter. For any two air interface formats, when at least one of the parameters, such as the subcarrier spacing, the symbol length, and the size of the Cyclic Prefix (CP) time window, of the two air interface formats is different, the two air interface formats are different air interface formats.

Then, under different air interface formats, taking a first air interface format with a longer symbol length and a second air interface format with a shorter symbol length as examples, the UE may determine the starting time of the uplink transmission time unit for uplink transmission according to the same TA amount, where the starting time of the uplink transmission time unit is the same in the first air interface format and the second air interface format. However, in an aspect of the present invention, different TA valid durations may be set for the first air interface format and the second air interface format, respectively. For example, the TA effective duration of the TA amount in the first air interface format (i.e., the first TA effective duration) is set to be greater than the TA effective duration of the TA amount in the second air interface format (i.e., the second TA effective duration).

If the UE determines to execute the uplink transmission by using the first air interface format, when the starting time of the uplink transmission time unit arrives, if the effective time length of the first TA is not finished, the UE can execute the uplink transmission, otherwise, the UE cancels the uplink transmission. Correspondingly, if the UE determines to execute uplink transmission using the second air interface format, when the start time of the uplink transmission time unit arrives, if the second TA valid duration has not ended, the UE may execute the uplink transmission, otherwise, the UE cancels the uplink transmission. Thus, the UE can manage uplink transmission processes in different air interface formats through the TA valid durations in different air interface formats, thereby improving uplink transmission efficiency in multiple air interface formats.

Further, the CP time window refers to a time range within which the radio access device can correctly receive the uplink transmission time unit sent by the UE. When the time when the wireless access equipment receives the uplink transmission time unit is located in the CP time window, the uplink data in the uplink transmission time unit can be correctly received by the wireless access equipment, otherwise, the wireless access equipment can not correctly receive the uplink data sent by the UE.

As shown in fig. 4, taking an air interface format 1 and an air interface format 2 as examples, a CP time window in the air interface format 1 with a larger symbol length is longer, and a CP time window in the air interface format 2 with a smaller symbol length is shorter. At this time, as shown in fig. 4, for any air interface format, the UE may determine the time T3 for sending the uplink transmission time unit according to the currently used TA amount. When T3 arrives, if the TAT is not timed out, the UE may complete uplink transmission using air interface format 1 or air interface format 2.

However, if the timing duration of the TAT is longer, that is, the effective time of the TA is longer, for the air interface format 2, as shown in fig. 4, when the time T3 arrives, the TAT is still not overtime, and at this time, because the CP time window of the UE is shorter, the uplink subframe sent by the UE using the air interface format 2 is likely to fall outside the CP time window of the UE. However, if the timing duration of the TAT is short, that is, the effective time of the TA is short, the UE needs to frequently update the TA amount used by the UE, which increases the uplink transmission cost. Moreover, the UE may need to use the air interface format 2 for uplink transmission in a few cases, and frequent updating of the TA amount used by the UE undoubtedly wastes a lot of transmission resources.

In this regard, in the uplink transmission method provided in the embodiment of the present invention, multiple air interface formats in a cell may be divided into multiple air interface formats, for example, the multiple air interface formats at least include a first air interface format and a second air interface format. The length of a symbol in any one of the first air interface formats is greater than the length of a symbol in each of the second air interface formats. Moreover, since the length of the symbol in the first air interface format is greater than the length of the symbol in the second air interface format, the CP time window in the first air interface format may be set to be correspondingly larger, and the CP time window in the second air interface format may be set to be correspondingly smaller.

Correspondingly, the radio access device may set a corresponding TA valid duration for each air interface format, for example, set a first TA valid duration corresponding to the first air interface format, set a second TA valid duration corresponding to the second air interface format, and the first TA valid duration is greater than the second TA valid duration.

Then, as shown in fig. 5, in the uplink transmission process, the UE may update the TA amount used by itself according to an instruction, for example, a TA command (TA command), received from the radio access equipment for updating the TA amount used by the UE. Furthermore, the UE may calculate the starting time T of the uplink transmission time unit for uplink transmission according to the TA amount and the starting time of the downlink transmission time unit, where the uplink transmission time unit in the first air interface format is the uplink transmission time unit a in fig. 5, and the uplink transmission time unit in the second air interface format is the uplink transmission time unit B in fig. 5, that is, the same TA amount is applicable to each air interface format before being updated. And simultaneously, after receiving the instruction for updating the TA quantity used by the UE, the UE is triggered to start timing, wherein the TA quantity is only effective to the first air interface format within the first TA effective duration, and the TA quantity is only effective to the second air interface format within the second TA effective duration.

The UE may determine a target air interface format required for performing the uplink transmission from the first air interface format and the second air interface format, for example, the determined target air interface format is the second air interface format. Then, when the starting time T of the uplink transmission time unit B arrives, if the TA valid duration corresponding to the second air interface format (i.e., the second TA valid duration) has ended, the UE may determine that the second air interface format cannot be used for uplink transmission, thereby canceling the uplink transmission this time; if the second TA valid duration is not yet finished, the UE may determine that the second air interface format can be used for uplink transmission, so as to perform the uplink transmission using the second air interface format.

It can be seen that, in the embodiment of the present invention, the same TA amount is set for all types of air interface formats in a cell, but different TA valid durations are set for different types of air interface formats, that is, the valid time of the TA amount updated each time set in the second air interface format is shorter, and the valid time of the TA amount updated each time set in the first air interface format is longer. This is because the CP time window in the second air interface format is smaller than the CP time window in the first air interface format, and when the second TA valid duration corresponding to the second air interface format is shorter, the UE transmits the uplink transmission time unit using the second air interface format, which can improve the probability that the uplink transmission time unit received by the wireless access device falls into the CP time window of the UE. And the CP time window in the first air interface format is larger, so that when the first TA valid duration corresponding to the first air interface format is longer, the probability that the uplink transmission time unit received by the radio access equipment falls into the CP time window is still higher.

For example, the radio access device may determine, according to the size of the CP time window in different air interface formats and the speed of the UE, the effective duration of the TA amount in different air interface formats for the UE, for example, the radio access device may generate, according to the size of the CP time window in the first air interface format and the speed of the UE, a first TAT configuration parameter for indicating the effective duration of the first TA in the first air interface format for the UE, and the radio access device may further generate, according to the size of the CP time window in the second air interface format and the speed of the UE, a second TAT configuration parameter for indicating the effective duration of the second TA in the second air interface format for the UE. And further, the wireless access device sends the first TAT configuration parameter and the second TAT configuration parameter to the UE, and when receiving the TA command, the UE starts a first TAT corresponding to the first TAT configuration parameter and a second TAT corresponding to the second TAT configuration parameter at the same time.

Compared with the prior art in which a uniform TA effective duration is set for all air interface formats, the TA effective duration adapted to the size of the CP time window can be set for different types of air interface formats in the embodiment of the present invention. Specifically, when the length of a symbol in an air interface format is long, the corresponding CP time window is large, and therefore, even if the effective duration of the TA (i.e., the effective duration of the first TA) set in the air interface format is long, the probability that the uplink transmission time unit received by the wireless access device falls into the CP time window is still high; correspondingly, when the length of the symbol in the air interface format is shorter, the corresponding CP time window is smaller, and then the effective duration of the TA (the second TA effective duration) in the air interface format is set to be shorter, so as to reduce the probability that the uplink transmission time unit received by the radio access equipment falls outside the CP time window. It can be seen that by setting TA valid durations adapted to the CP time window sizes for different types of air interface formats, the probability that the wireless access device correctly receives the uplink transmission time unit can be increased while the TA amount is not frequently updated, thereby increasing the uplink transmission efficiency in the air interface of the fifth generation mobile communication system.

It should be noted that, in the embodiment of the present invention, only two air interface formats, namely, a first air interface format and a second air interface format, are illustrated as an example, it may be understood that N (N > 1) air interface formats may be included in one cell, and each air interface format may include one or more air interface formats, which is not limited in this embodiment of the present invention.

The hardware structure of the UE in the embodiment of the present invention may refer to the constituent elements of the UE shown in fig. 6.

As shown in fig. 6, the UE may specifically include: radio frequency (RF radio frequency) circuitry 320, memory 330, input unit 340, display unit 350, gravity sensor 360, audio circuitry 370, processor 380, and power supply 390. Those skilled in the art will appreciate that the UE architecture shown in fig. 6 does not constitute a limitation of the UE, and may include more or fewer components than shown, or combine certain components, or a different arrangement of components.

The following specifically describes each constituent component of the UE with reference to fig. 6:

the RF circuit 320 may be used for receiving and transmitting signals during information transmission and reception or during a call, and in particular, receives downlink information of the wireless access device and then processes the downlink information to the processor 380; in addition, the uplink data is transmitted to the wireless access device. Typically, the RF circuitry includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, RF circuit 320 may also communicate with networks and other devices via wireless communications.

The memory 330 may be used to store software programs and modules, and the processor 380 executes various functional applications of the UE and data processing by operating the software programs and modules stored in the memory 330.

The input unit 340 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the UE. Specifically, the input unit 340 may include a touch panel 341 and other input devices 342.

The display unit 350 may be used to display information input by the user or information provided to the user and various menus of the UE. The display unit 350 may include a display panel 351, and optionally, the display panel 351 may be configured in the form of a Liquid Crystal Display (LCD), an organic light-emitting diode (OLED), or the like.

The UE may further include a gravity sensor 360 and other sensors, such as a light sensor, a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, etc., which are not described in detail herein.

The audio circuitry 370, speaker 371, microphone 372 may provide an audio interface between the user and the UE. The audio circuit 370 may transmit the received electrical signal converted from the audio data to the speaker 371, and the audio signal is converted from the speaker 371 to be output; on the other hand, the microphone 372 converts the collected sound signals into electrical signals, which are received by the audio circuitry 370 and converted into audio data, which are output to the RF circuitry 320 for transmission to, for example, another UE, or to the memory 330 for further processing.

The processor 380 is a control center of the UE, connects various parts of the entire UE using various interfaces and lines, and performs various functions of the UE and processes data by running or executing software programs and/or modules stored in the memory 330 and calling data stored in the memory 330, thereby performing overall monitoring of the UE. Optionally, processor 380 may include one or more processing units.

Although not shown, the UE may further include a power supply, a WiFi (wireless fidelity) module, a bluetooth module, and the like, which are not described in detail herein.

The hardware structure of the wireless access device in the embodiment of the present invention may be as shown in fig. 7.

As shown in fig. 7, the wireless access apparatus includes: the radio remote unit comprises a Base Band Unit (BBU), a Radio Remote Unit (RRU) and an antenna, wherein the BBU and the RRU can be connected by optical fibers, the RRU is connected to the antenna by a coaxial cable and a power divider (coupler), and generally one BBU can be connected with a plurality of RRUs.

The RRU may include 4 modules: the digital intermediate frequency module, the transceiver module, the power amplifier module and the filter module. The digital intermediate frequency module is used for modulation and demodulation, digital up-down frequency conversion, digital-to-analog conversion and the like of optical transmission; the transceiver module completes the conversion from the intermediate frequency signal to the radio frequency signal; and after the radio frequency signal is amplified by the power amplification module and filtered by the filtering module, the radio frequency signal is transmitted out through an antenna.

The BBU is used to perform baseband processing functions (coding, multiplexing, modulation, spreading, etc.) of an air interface (i.e., an interface between the UE and the radio access device), interface functions of a logical interface between a Radio Network Controller (RNC) and the radio access device, signaling processing, local and remote operation maintenance functions, and functions of monitoring a working state of the radio access device and reporting alarm information.

Hereinafter, an uplink transmission method provided by the embodiment of the present invention will be described in detail with reference to specific embodiments, as shown in fig. 8, including:

700. the UE receives configuration information sent by the wireless access equipment, wherein the configuration information comprises a corresponding relation between a first air interface format and a first TAT and a corresponding relation between a second air interface format and a second TAT.

The length of the symbol in the first air interface format is greater than that of the symbol in the second air interface format, and the CP time window in the first air interface format is greater than that in the second air interface format; the timing duration of the first TAT is longer than that of the second TAT.

Before the UE performs uplink transmission, the radio access device may pre-divide N air interface formats in a cell in which the UE is located, for example, divide the N air interface formats into a first air interface format and a second air interface format according to a CP time window size, where the CP time window in the first air interface format is greater than the CP time window in the second air interface format. And the wireless access equipment sets a TAT for each air interface format to realize the timing of the effective duration of the same TA quantity under each air interface format. For example, a first TAT is set for a first air interface format, a second TAT is set for a second air interface format, and the timing duration of the first TAT is longer than the timing duration of the second TAT.

In step 700, the radio access device carries the determined correspondence between the first air interface format and the first TAT, and the correspondence between the second air interface format and the second TAT in the configuration information, and sends the configuration information to the UE. Thus, the UE can determine the effective duration of the TA amount under different air interface formats according to the corresponding relationship between the different air interface formats and the TAT in the configuration information.

In addition, after receiving the configuration information, the UE may send a response to the radio access device, that is, notify the radio access device to: the UE has received the configuration information.

701. And the UE receives a TA instruction sent by the wireless access equipment, wherein the TA instruction is used for updating the TA amount used by the UE.

702. And the UE determines the starting time of the uplink transmission time unit for uplink transmission according to the updated TA quantity.

The starting time of the uplink tti determined by the UE using the updated TA amount may be a time point, i.e., the starting time of the uplink tti, or a time range, for example, the starting time of the uplink tti is T4-T5, and at this time, the starting time of the uplink tti may be any time from T4 to T5.

For example, the UE may use the time obtained by shifting the determined starting position of the downlink tti forward by the updated TA amount as the starting time of the uplink tti.

The specific value of the TA amount is changed in real time according to the distance between the UE and the radio access device, so that the TA amount stored by the UE is invalid if the radio access device does not adjust the TA amount for a long time. If the UE determines the starting position of the uplink tti using the failed TA amount, the UE may not correctly receive the uplink tti sent by the UE.

Accordingly, the radio access equipment may periodically or aperiodically send a TA command, e.g., a TA command, to the UE for updating its TA amount. The TA instruction may directly carry a specific value of the TA amount that the UE needs to update, and at this time, the UE may directly update the currently used TA amount to the specific value of the TA amount carried in the first indication information. Or, the TA instruction may also carry a TA offset, and the UE subsequently adjusts the TA amount according to the TA offset based on the currently used TA amount to obtain an updated TA amount.

In step 701-702, after receiving the TA command, the UE can determine the updated TA amount according to the method. Furthermore, the UE may forward shift by the amount of TA based on the determined start time of the downlink tti, thereby obtaining the start time of the uplink tti.

Subsequently, when the UE needs to send uplink data to the radio access device, the UE may send the uplink data to the radio access device by using the corresponding uplink transmission resource when the uplink transmission time unit arrives.

703. The UE starts a first TAT corresponding to the first air interface format and a second TAT corresponding to the second air interface format.

After the UE performs step 701, that is, receives the first indication information, the UE may be triggered to perform step 703, that is, a first TAT corresponding to the first air interface format and a second TAT corresponding to the second air interface format are started. In addition, in the implementation of the present invention, starting a TAT, for example, starting a first TAT means: and if the first TAT is not started yet, triggering the first TAT to start timing, and if the first TAT is running currently, triggering the first TAT to restart timing.

It should be noted that, the embodiment of the present invention does not limit the sequence between step 702 and step 703, and after step 701 is executed, the UE may execute steps 702 and 703 at the same time.

704. And the UE determines a target air interface format required by the current uplink transmission from the first air interface format and the second air interface format.

In step 704, when the UE needs to send uplink data to the radio access device, the radio access device may allocate uplink transmission resources for uplink transmission to the UE, where each uplink transmission resource uniquely corresponds to one air interface format, and therefore, after the UE acquires the uplink transmission resource, it may determine an air interface format, for example, air interface format a, corresponding to the uplink transmission resource when performing the current uplink transmission. If the air interface format A belongs to the first air interface format, the UE can determine that the target air interface format is the first air interface format, and if the air interface format A belongs to the second air interface format, the UE can determine that the target air interface format is the second air interface format.

705. When the starting time of the uplink transmission time unit arrives, if the TAT corresponding to the target air interface format is finished, the UE determines that the target air interface format cannot be used for uplink transmission, and if the TAT corresponding to the target air interface format is not finished, the UE determines that the target air interface format can be used for uplink transmission.

In step 705, when the start time of the uplink transmission time unit determined in step 702 arrives, the UE determines whether the TAT corresponding to the target air interface format is ended. Taking the second air interface format as a target air interface format for example, at this time, the TAT corresponding to the target air interface format is the second TAT, and if the second TAT is ended at this time, that is, the state of the second TAT is an overtime state, it indicates that the effective duration of the TA amount is ended in the second air interface format, and at this time, the uplink transmission is completed without using the second air interface format; correspondingly, if the second TAT is not finished yet, that is, the state of the second TAT is a timing state, it indicates that the current TA amount is valid in the second air interface format, then the UE may determine that the second air interface format is available for uplink transmission, and subsequently, the UE may use the second air interface format to complete the current uplink transmission resource.

In this embodiment of the present invention, the timing duration of the first TAT is longer than the timing duration of the second TAT, that is, the effective duration of the TA amount in the first air interface format is longer than the effective duration of the TA amount in the second air interface format.

Thus, for the second air interface format, because the CP time window is smaller, the risk that the uplink transmission time unit received by the radio access equipment falls outside the CP time window is higher, therefore, when the effective duration of the TA amount corresponding to the second air interface format is also shorter, the probability that the uplink transmission time unit received by the radio access equipment falls inside the CP time window is higher within the effective duration of the TA amount, and when the timing duration of the second TAT is exceeded, the UE cannot perform uplink transmission by using the second air interface format, thereby reducing the risk that the uplink transmission time unit received by the radio access equipment falls outside the CP time window.

Correspondingly, for the first air interface format, because the CP time window is large, the risk that the uplink transmission time unit received by the radio access equipment falls outside the CP time window is small, and therefore, even if the effective duration of the TA amount corresponding to the first air interface format is also long, the probability that the uplink transmission time unit received by the radio access equipment falls inside the CP time window is higher within the effective duration of the TA amount, so that the radio access equipment does not need to frequently instruct the UE to update the TA amount.

It can be seen that, in the embodiment of the present invention, by setting TA valid durations adapted to sizes of CP time windows of different types of air interface formats, the probability that the wireless access device correctly receives the uplink transmission time unit can be increased while the TA amount is not frequently updated, thereby increasing the uplink transmission efficiency in the NR system.

Further, in the embodiment of the present invention, different TA valid durations are set for different types of air interface formats, that is, a first TAT corresponding to a first air interface format and a second TAT corresponding to a second air interface format. Moreover, the timing duration of the first TAT is greater than the timing duration of the second TAT, so that when the UE starts the first TAT and the second TAT at the same time, three timing states occur. According to the time sequence, the three timing states are as follows: the first TAT is not timed out and the second TAT is not timed out (timing state 1); the first TAT has not timed out and the second TAT has timed out (timer state 2); and the first TAT times out and the second TAT times out (timer state 3).

For timing state 1, that is, the first TAT is not overtime, and the second TAT is not overtime, at this time, the TA amount is valid in both the first air interface format and the second air interface format, and then, no matter which air interface format the UE determines in step 704 is, the UE may directly perform the uplink transmission using the target air interface format.

Because the timing duration of the second TAT is less than that of the first TAT, when the second TAT times out, the first TAT does not time out, and at this time, the UE releases the uplink configuration resource configured on the second air interface format corresponding to the second TAT.

Specifically, the uplink configuration resource may specifically include: at least one of a Physical Uplink Control Channel (PUCCH) resource, a Sounding Reference Signal (SRS) resource, a resource for transmitting hybrid automatic repeat request (HARQ) feedback, and a Physical Uplink Shared Channel (PUSCH) resource, which are configured on the second air interface format. Therefore, the UE can be prevented from still using the uplink configuration resources to execute uplink transmission after the second TAT is overtime, and the risk that the uplink transmission time unit received by the wireless access equipment falls outside the CP time window is reduced.

In addition, some uplink configuration resources may be shared by the second air interface format and the first air interface format at the same time, for example, the radio access device configures radio resource a for the UE, and the radio resource a may be used in the second air interface format or the first air interface format. Then, when the UE performs uplink transmission, it may be determined to complete the uplink transmission using the second air interface format or the first air interface format according to the service type of the data to be transmitted.

When the second TAT is overtime but the first TAT is not overtime, since the TA amount is still valid in the first air interface format at this time, that is, the first air interface format is still available for uplink transmission, once the UE releases the portion of the uplink configuration resource, the UE may not use the portion of the uplink configuration resource to complete the uplink transmission, and therefore, the UE may not process the portion of the uplink configuration resource temporarily.

And if the second air interface format has the HARQ process, the UE may empty the buffer corresponding to the HARQ process, because in the application scenario of the synchronous uplink non-adaptive retransmission, there is data in the buffer corresponding to the HARQ process, and the UE may automatically retransmit the data, so that after the UE empties the buffer corresponding to the HARQ process, it may be avoided that the UE automatically retransmits the data in the HARQ buffer using the TA amount that has failed in the second air interface format.

When the second TAT times out, it enters the timing state 2, i.e. the first TAT does not time out, but the second TAT times out, at this time, the TA amount is valid in the first gap format, but invalid in the second gap format. Then, when the target air interface format is the first air interface format, the UE may use the first air interface format (i.e., the target air interface format) to perform the uplink transmission.

When the target air interface format is the second air interface format, because the TA amount is invalid in the second air interface format at this time, the UE may send first indication information to the radio access device using the first air interface format in which the TA amount is still valid, where the first indication information is used to notify the radio access device: the second TAT has timed out.

Specifically, the first indication information may specifically be a Scheduling Request (SR) indication or a Buffer Status Report (BSR) indication, and the like, but the embodiment of the present invention is not limited to this, and for example, the UE may carry the second indication information in a Media Access Control (MAC) subheader or a MAC CE (MAC Control Element) and send the MAC Control subheader or the MAC CE to the radio access device.

After receiving the first indication information, the radio access device may send a TA command to the UE again to trigger the UE to re-determine the starting time of the uplink transmission time unit, and restart the first TAT and the second TAT. Thus, the second TAT just started is not overtime, and at this time, the UE may use the second air interface format (i.e., the target air interface format) to perform a new uplink transmission.

Further, when the first TAT also times out and the second TAT with a shorter timing time has timed out, at this time, the UE may further release the uplink configuration resource configured on the first air interface format.

Similarly, the uplink configuration resource may specifically include: at least one of a PUCCH resource, a resource for transmitting SRS, a resource for transmitting HARQ feedback, and a PUSCH resource configured on the first air interface format. Therefore, after the first TAT is overtime, the UE still uses the uplink configuration resources to carry out uplink transmission with the wireless access equipment, and the risk that the uplink transmission time unit received by the wireless access equipment falls outside the CP time window is reduced.

In addition, for the uplink configuration resources corresponding to the second air interface format and the first air interface format at the same time, since the TA amount is invalid in both the first air interface format and the second air interface format, that is, both the first air interface format and the second air interface format cannot be used for uplink transmission, the UE may release the uplink configuration resources.

Further, when the first TAT times out, the timer state 3 is entered, that is, the first TAT times out, and the second TAT also times out. At this time, no matter whether the target air interface format is the first air interface format or the second air interface format, the UE cannot use the target air interface format for the uplink transmission, and then the UE needs to initiate random access to the wireless access device to establish a connection relationship between the UE and the wireless access device.

The specific method for the UE to initiate the random access to the radio access device may refer to step 801 and step 804 in the following embodiments, and therefore, the detailed description is omitted here.

Further, in order to meet the transmission requirements of large capacity and high rate of the mobile communication system, a high frequency band greater than 6GHz is introduced for communication, so as to utilize the transmission characteristics of large bandwidth and high rate. Since the path loss of high frequency communication (i.e., attenuation generated during transmission of wireless signals between the UE and the wireless access device) is high, the UE can perform uplink transmission with the wireless access device through a beam (beam), so as to ensure a propagation distance and a high beam gain. The beam refers to a spatial resource having energy transmission directivity, and correspondingly, the beam group refers to a group of spatial resources having energy transmission directivity.

At this time, the radio access equipment may configure TA amounts corresponding to different beams (or beam groups) for the UE under each air interface format. For example, if the second air interface format includes 3 beam groups, that is, beam group 1, beam group 2, and beam group 3, each beam group may be configured to correspond to one TA amount. The multiple beams (or beam groups) in the same air interface format may share the same TA valid duration, or may set a corresponding TA valid duration for each beam (or beam group).

Generally, when performing communication in a high frequency band, a CP time window set by the radio access device is generally smaller, and therefore, when the UE performs uplink transmission with the radio access device through a beam (or a beam group) in any air interface format, a TA effective duration of the UE is generally smaller than a TA effective duration when performing communication in a low frequency band.

At this time, the UE may still adjust the TA amount according to the TA instruction sent by the radio access equipment for updating the TA amount, except that the UE may determine which beam (or beam group) corresponds to the TA amount that needs to be updated.

In a possible implementation manner, the radio access device may directly carry, in the TA instruction, an identifier of a target beam (or a target beam group) corresponding to the TA amount to be updated, for example, an index of the beam group 1, so that the UE may determine to update the TA amount corresponding to the beam group 1 directly according to the index.

In another possible implementation manner, the UE may use the beam (or the beam group) used when the wireless receiving device sends the TA instruction as a target beam (or a target beam group) corresponding to the TA amount to be updated, and further determine to update the TA amount corresponding to the target beam (or the target beam group).

Optionally, the UE starts the TAT corresponding to the target beam (or the target beam group) after receiving the TA instruction, and when the TAT is overtime, the UE only releases the uplink configuration resource corresponding to the target beam (or the target beam group), or may release the uplink configuration resources corresponding to all beams (or the beam groups) in the target air interface format to which the target beam (or the target beam group) belongs.

In addition, if the TATs corresponding to all beams (or beam groups) in a cell are overtime, the UE may release the data in the HARQ buffer corresponding to the cell in the UE, in addition to releasing the uplink configuration resources corresponding to all beams (or beam groups) in the target air interface format.

Further, after the first TAT and the second TAT enter the timing state 3, no matter whether the target air interface format is the first air interface format or the second air interface format, the UE cannot use the target air interface format for the uplink transmission, and therefore the UE needs to initiate random access to the wireless access device to establish a connection between the UE and the wireless access device.

Specifically, the embodiment of the present invention provides a random access method, as shown in fig. 9, the method includes the following

steps

801 and 804.

It should be noted that the random access method shown in the following step 801-.

801. And the UE initiates random access to the wireless access equipment on the third air interface format.

Specifically, the UE may determine an air interface format set to which an uplink data to be sent belongs according to a Logical Channel (LCH) in which the LCH is located.

For example, the LCH of the logical channel in which the uplink data to be transmitted is located is LCH 1, and the air interface format corresponding to LCH 1 is the first air interface format, then, a set of all air interface formats in the first air interface format may be used as the air interface format set, that is, the air interface format set to which LCH 1 belongs is determined.

Subsequently, the UE may arbitrarily select a third air interface format from the air interface format set, for example, the LCH 1 has the highest priority in the air interface format a, that is, the priority of the air interface format a is the highest at this time, and then the UE may use the air interface format a as the third air interface format and initiate random access to the radio access device on the third air interface format.

802. And the UE receives second indication information sent by the wireless access equipment, wherein the second indication information comprises at least one index of a fourth air interface format, and the fourth air interface format is any air interface format except the third air interface format.

At the same time, multiple UEs may initiate random access to the radio access device on the same air interface format, and if the number of UEs is too large, it may be possible to respond that some UEs cannot successfully complete random access. In this case, the wireless access device may send second indication information, which is referred to as a back-off indication (back off) for convenience of description (other names may be used as well) for instructing the UE to wait for a certain time period and then initiate random access again to the UE. For example, the back-off indication includes a time range of 200 milliseconds (ms) -700ms, then the UE may select a value from 200ms-700ms, for example, 500ms, and then, after receiving the back-off indication, the UE waits 500ms and then initiates random access again.

In the embodiment of the present invention, when the number of UEs initiating random access at the same time is greater than a certain threshold, the wireless access device may send second indication information to one or more UEs failing to successfully access, where the second indication information includes at least one index of a fourth air interface format, that is, indicates that the UE may continue to initiate random access on the fourth air interface format.

For example, an air interface format list may be defined in the protocol, and is used to indicate a corresponding relationship between different air interface formats and indexes of the air interface formats. Thus, when the wireless access device sends the back-off indication, the available index of the air interface format can be selected for the UE according to the air interface format list and carried in the back-off indication to be sent to the UE. And the UE searches the air interface format list for the air interface format corresponding to the index of the air interface format in the fallback indication, which is the fourth air interface format.

Or, an air interface format list may be broadcasted by the system information of the cell in which the UE is located, and is also used to indicate a corresponding relationship between different air interface formats and indexes of the air interface formats, so that after the wireless access device sends a fallback indication carrying an index of a fourth air interface format to the UE, the UE determines, according to the air interface format list acquired from the system information, that an air interface format corresponding to the index of the air interface format in the fallback indication is the fourth air interface format.

It should be noted that there may be one or more fourth empty port formats, and the embodiment of the present invention does not limit this. When only one fourth air interface format is included, the UE may directly initiate random access to the wireless access device on the fourth air interface format; when a plurality of fourth empty formats are included, the following steps 803-804 can be performed continuously.

803. And the UE determines an air interface format meeting the random access condition from at least one fourth air interface format.

Illustratively, the random access condition may specifically be a bandwidth range supported by the UE. For example, if the bandwidth range supported by the UE is 3.5GHz-4.0GHz, if an air interface format that does not satisfy the bandwidth limitation of 3.5GHz-4.0GHz exists in the fourth air interface formats indicated by the fallback indication, the UE determines that the random access condition is not satisfied; otherwise, the UE determines that the UE meets the random access condition. For another example, the random access condition may specifically be at least one air interface format supported by the UE, and if an air interface format supported by the UE exists in the fourth air interface formats indicated by the fallback indication, the UE determines that the random access condition is satisfied; otherwise, if there is no air interface format supported by the UE in the fourth air interface formats indicated by the fallback indication, the UE determines that it meets the random access condition, and at this time, the UE may continue to initiate random access to the wireless access device again in the third air interface format. Of course, if there are multiple air interface formats satisfying the random access condition, the UE may select one air interface format at random.

Or, the radio access device may also send the random access condition to the UE in advance, so that the UE may also determine an air interface format that satisfies the random access condition obtained in advance according to the random access condition obtained from the radio access device.

For example, the random access condition may specifically be: and when the path loss is larger than a first preset value, the UE selects a first air interface format indicated in the rollback instruction, otherwise, the UE selects a second air interface format indicated in the rollback instruction. For another example, the random access condition may specifically be: and when the reason for triggering the random access is that the first TAT and the second TAT are overtime, the UE selects a first air interface format indicated in the rollback indication, otherwise, the UE selects a second air interface format indicated in the rollback indication.

Therefore, the UE can disperse the random access initiated by the UE into other multiple air interface formats according to the conditions of the self limiting conditions, the reason for triggering the random access and the like, thereby reducing the collision phenomenon caused by the fact that multiple UEs simultaneously send the random access in the same air interface format.

It should be understood that the foregoing merely illustrates some possible implementations of the random access condition, and those skilled in the art may set the specific random access condition according to practical experience, and the embodiment of the present invention does not limit this.

804. And the UE initiates random access to the wireless access equipment on the air interface format meeting the random access condition.

The above-mentioned scheme provided by the embodiment of the present invention is introduced mainly from the perspective of interaction between network elements. It is to be understood that the UE, the wireless access device, and the like, for implementing the above functions, include corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present embodiments.

In the embodiment of the present invention, the UE, the wireless access device, and the like may be divided into functional modules according to the method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the embodiment of the present invention is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

In the case of adopting the functional modules divided for the respective functions, fig. 10 shows a possible structural diagram of the UE involved in the above embodiment, where the UE includes: an acquiring unit 91, a determining unit 92, a transmitting unit 93, an executing unit 94 and a random access unit 95.

The obtaining unit 91 is configured to support the UE to perform the

process

700 and 701 in fig. 8 and 802 in fig. 9; the determining unit 92 is configured to support the UE to perform the procedures 702, 704 and 705 in fig. 8 and 803 in fig. 9; the performing unit 94 is configured to support the UE to perform the process 703 in fig. 8; the sending unit 93 is configured to support the UE to send first indication information to the radio access device, where the first indication information is used to notify the radio access device that the second TA valid duration has ended; the random access unit 95 is used to support the UE to perform the

procedures

801 and 804 in fig. 9. All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and may refer to the foregoing method embodiment, which is not described herein again.

In the case of dividing each functional module by corresponding functions, fig. 11 shows a possible structural diagram of the wireless access device according to the above embodiment, where the wireless access device includes: a determination unit 101, and a transmission unit 102.

The determining unit 101 is configured to determine, for the UE, a first TA valid duration of a time advanced TA amount in a first air interface format and a second TA valid duration of a TA amount in a second air interface format, where a length of a symbol in the first air interface format is greater than a length of a symbol in the second air interface format, and the first TA valid duration is greater than the second TA valid duration; a transmitting unit 102, configured to send configuration information to the UE, where the configuration information carries a correspondence between a first air interface format and a first TA valid duration, and a correspondence between a second air interface format and a second TA valid duration.

Further, the transmission unit 102 is further configured to: and when the first TA effective duration is not finished and the second TA effective duration is finished, receiving first indication information sent by the UE, wherein the first indication information is used for informing the wireless access equipment that the second TA effective duration is finished.

Further, the transmission unit 102 is further configured to: and when the first TA effective duration is finished and the second TA effective duration is finished, establishing connection with the UE through random access on the first air interface format.

Further, the transmission unit 102 is further configured to: and sending second indication information to the UE, wherein the second indication information comprises an index of at least one candidate air interface format, and the candidate air interface format is any air interface format except the first air interface format.

In case of using integrated units, fig. 12 shows a possible structure diagram of the UE (or radio access equipment) involved in the above embodiments. The UE (or wireless access device) includes: a processing module 1302 and a communication module 1303. The processing module 1302 is configured to control and manage actions of the UE. The communication module 1303 is used for supporting communication between the UE and other network entities. The UE may also include a memory module 1301 for storing program codes and data for the UE (or wireless access device).

The processing module 1302 may be a Processor or a controller, such as a Central Processing Unit (CPU), a general purpose Processor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The communication module 1303 may be a transceiver, a transceiver circuit, a communication interface, or the like. The storage module 1301 may be a memory.

When the processing module 1302 is a processor, the communication module 1303 is an RF transceiver circuit, and the storage module 1301 is a memory, the UE according to the embodiment of the present invention may be the UE shown in fig. 6.

When the processing module 1302 is a processor, the communication module 1303 is an RF transceiver circuit, and the storage module 1301 is a memory, the radio access device according to the embodiment of the present invention may be the radio access device shown in fig. 7.

In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware or any combination thereof. When implemented using a software program, may take the form of a computer program product, either entirely or partially. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An uplink transmission method, comprising:

the method comprises the steps that User Equipment (UE) determines the starting time of an uplink transmission time unit for uplink transmission according to the used time advance TA quantity;

the UE at least determines a target air interface format required by the uplink transmission from a first air interface format and a second air interface format, wherein the length of a symbol in the first air interface format is greater than that of a symbol in the second air interface format, and the first TA effective duration of the TA quantity in the first air interface format is greater than the second TA effective duration of the TA quantity in the second air interface format;

and when the starting time of the uplink transmission time unit arrives, if the effective time length of the TA corresponding to the target air interface format is not finished, the UE executes the uplink transmission by using the target air interface format.

2. The method of claim 1, wherein when the start time of the uplink tti arrives, the method further comprises:

and if the TA effective duration corresponding to the target air interface format is finished, the UE cancels the uplink transmission.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

and when the first TA effective duration is not finished and the second TA effective duration is finished, the UE releases the configured uplink configuration resources on the second air interface format, wherein the uplink configuration resources comprise at least one of Physical Uplink Control Channel (PUCCH) resources, Sounding Reference Signal (SRS) resources, hybrid automatic repeat request (HARQ) feedback resources and Physical Uplink Shared Channel (PUSCH) resources.

4. The method according to claim 1 or 2, wherein the target air interface format is the second air interface format, the TA validity duration corresponding to the target air interface format is the second TA validity duration,

wherein, when the first TA valid duration is not ended and the second TA valid duration is ended, the method further comprises:

and the UE sends first indication information to the wireless access equipment by using the first air interface format, wherein the first indication information is used for informing the wireless access equipment that the second TA effective duration is finished.

5. The method according to claim 1 or 2, characterized in that the method further comprises:

and when the first TA effective duration is finished and the second TA effective duration is finished, the UE releases the configured uplink configuration resource on the first air interface format, wherein the uplink configuration resource comprises at least one of PUCCH resource, SRS resource, HARQ feedback resource and PUSCH resource.

6. The method according to claim 1 or 2, wherein when the first TA-validity period ends and the second TA-validity period ends, the method further comprises:

and the UE initiates random access to the wireless access equipment in a third air interface format, wherein the third air interface format is any one of air interface format sets to which a Logic Channel (LCH) of the uplink data to be transmitted belongs.

7. The method of claim 6, further comprising:

and the UE determines one of the air interface format sets as the third air interface format according to the priority of the LCH on each air interface format in the air interface format set.

8. The method of claim 6, further comprising:

the UE receives second indication information sent by the wireless access equipment, wherein the second indication information comprises an index of at least one fourth air interface format, and the fourth air interface format is any air interface format except the third air interface format;

the UE initiates random access to the wireless access device on the at least one fourth air interface format.

9. The method of claim 8, wherein the UE initiates random access to the wireless access device on the at least one fourth air interface format, comprising:

the UE determines an air interface format meeting random access conditions from the at least one fourth air interface format, wherein the random access conditions comprise at least one air interface format supported by the UE and at least one bandwidth range supported by the UE;

and the UE initiates random access to the wireless access equipment on an air interface format meeting the random access condition.

10. The method according to claim 1 or 2, characterized in that the method further comprises:

when an instruction for updating the TA amount used by the UE is acquired, the UE starts a first time advance timer TAT corresponding to the first air interface format and a second TAT corresponding to the second air interface format, wherein the timing duration of the first TAT is the effective duration of the first TA, and the timing duration of the second TAT is the effective duration of the second TA.

11. The method of claim 8, further comprising:

and the UE receives configuration information sent by the wireless access equipment, wherein the configuration information comprises a corresponding relation between the first air interface format and the first TA effective duration and a corresponding relation between the second air interface format and the second TA effective duration.

12. An uplink transmission method, comprising:

the method comprises the steps that wireless access equipment determines a first TA effective duration of a TA amount in advance of time in a first air interface format and a second TA effective duration of the TA amount in a second air interface format for User Equipment (UE), wherein the length of a symbol in the first air interface format is greater than that of a symbol in the second air interface format, and the first TA effective duration is greater than the second TA effective duration;

and the wireless access equipment sends configuration information to the UE, wherein the configuration information carries the corresponding relation between the first air interface format and the first TA effective duration and the corresponding relation between the second air interface format and the second TA effective duration.

13. The method of claim 12, wherein when the first TA validity period does not end and the second TA validity period ends, the method further comprises:

and the wireless access equipment receives first indication information sent by the UE, wherein the first indication information is used for informing the wireless access equipment that the second TA effective duration is finished.

14. The method according to claim 12 or 13, wherein when the first TA-validity period ends and the second TA-validity period ends, the method further comprises:

the wireless access device establishes a connection with the UE through random access on a first air interface format.

15. The method of claim 14, further comprising:

and the wireless access equipment sends second indication information to the UE, wherein the second indication information comprises an index of at least one candidate air interface format, and the candidate air interface format is any air interface format except the first air interface format.

16. A User Equipment (UE), comprising:

a determination unit configured to: determining the starting time of an uplink transmission time unit for uplink transmission according to the used TA amount; determining a target air interface format required by the uplink transmission at least from a first air interface format and a second air interface format, wherein the length of a symbol in the first air interface format is greater than that of a symbol in the second air interface format, and the first TA effective duration of the TA quantity in the first air interface format is greater than the second TA effective duration of the TA quantity in the second air interface format;

an execution unit to: and when the starting time of the uplink transmission time unit arrives, if the TA effective duration corresponding to the target air interface format is not finished, executing the uplink transmission by using the target air interface format.

17. The UE of claim 16,

the execution unit is further configured to: and when the starting time of the uplink transmission time unit arrives, if the TA effective duration corresponding to the target air interface format is finished, cancelling the uplink transmission.

18. The UE of claim 16 or 17,

the execution unit is further configured to: and when the first TA effective duration is not finished and the second TA effective duration is finished, releasing the configured uplink configuration resources on the second air interface format, wherein the uplink configuration resources comprise at least one of Physical Uplink Control Channel (PUCCH) resources, Sounding Reference Signal (SRS) resources, hybrid automatic repeat request (HARQ) feedback resources and Physical Uplink Shared Channel (PUSCH) resources.

19. The UE according to claim 16 or 17, wherein the target air interface format is the second air interface format, and a TA valid duration corresponding to the target air interface format is the second TA valid duration, the UE further comprising:

a transmitting unit configured to: and when the first TA effective duration is not finished and the second TA effective duration is finished, sending first indication information to the wireless access equipment by using the first air interface format, wherein the first indication information is used for informing the wireless access equipment that the second TA effective duration is finished.

20. The UE of claim 16 or 17,

the execution unit is further configured to: and when the first TA effective duration is finished and the second TA effective duration is finished, releasing the configured uplink configuration resources on the first air interface format, wherein the uplink configuration resources comprise at least one of PUCCH resources, SRS resources, HARQ feedback resources and PUSCH resources.

21. The UE of claim 16 or 17, wherein the UE further comprises:

a random access unit configured to: and when the first TA effective duration is finished and the second TA effective duration is finished, initiating random access to the wireless access equipment on a third air interface format, wherein the third air interface format is any one of air interface format sets to which a Logic Channel (LCH) of the uplink data to be transmitted belongs.

22. The UE of claim 21,

the determining unit is further configured to: and determining one of the air interface format sets as the third air interface format according to the priority of the LCH on each air interface format in the air interface format set.

23. The UE of claim 21, wherein the UE further comprises an acquisition unit,

the acquiring unit is configured to receive second indication information sent by the wireless access device, where the second indication information includes an index of at least one fourth air interface format, and the fourth air interface format is any air interface format except the third air interface format;

the random access unit is further configured to: initiating random access to the wireless access device on the at least one fourth air interface format.

24. The UE of claim 23,

the determining unit is further configured to: determining an air interface format meeting a random access condition from the at least one fourth air interface format, where the random access condition includes at least one of the at least one air interface format supported by the UE and a bandwidth range supported by the UE;

the random access unit is specifically configured to: and initiating random access to the wireless access equipment on the air interface format meeting the random access condition.

25. The UE of claim 16 or 17, wherein when an instruction to update the amount of TA used by the UE is obtained,

the execution unit is further configured to: starting a first time advance timer TAT corresponding to the first air interface format and a second TAT corresponding to the second air interface format, wherein the timing duration of the first TAT is the effective duration of the first TA, and the timing duration of the second TAT is the effective duration of the second TA.

26. The UE of claim 23,

the obtaining unit is further configured to: receiving configuration information sent by the wireless access device, where the configuration information includes a correspondence between the first air interface format and the first TA valid duration, and a correspondence between the second air interface format and the second TA valid duration.

27. A wireless access device, comprising:

a determining unit, configured to determine, for a user equipment UE, a first TA valid duration of a time advanced TA amount in a first air interface format and a second TA valid duration of the TA amount in a second air interface format, where a length of a symbol in the first air interface format is greater than a length of a symbol in the second air interface format, and the first TA valid duration is greater than the second TA valid duration;

a transmission unit, configured to send configuration information to the UE, where the configuration information carries a correspondence between the first air interface format and the first TA valid duration, and a correspondence between the second air interface format and the second TA valid duration.

28. The wireless access device of claim 27,

the transmission unit is further configured to: and when the first TA effective duration is not finished and the second TA effective duration is finished, receiving first indication information sent by the UE, wherein the first indication information is used for informing the wireless access equipment that the second TA effective duration is finished.

29. The wireless access device of claim 27 or 28,

the transmission unit is further configured to: and when the first TA effective duration is finished and the second TA effective duration is finished, establishing connection with the UE through random access on a first air interface format.

30. The wireless access device of claim 29,

the transmission unit is further configured to: and sending second indication information to the UE, wherein the second indication information comprises an index of at least one candidate air interface format, and the candidate air interface format is any air interface format except the first air interface format.