CN110958670A

CN110958670A - Uplink data transmission method, user terminal and network side equipment

Info

Publication number: CN110958670A
Application number: CN201811134275.9A
Authority: CN
Inventors: 刘敏; 马路娟; 刘宏举
Original assignee: Hisense Co Ltd
Current assignee: Hisense Group Co Ltd; Hisense Co Ltd
Priority date: 2018-09-27
Filing date: 2018-09-27
Publication date: 2020-04-03

Abstract

The invention discloses an uplink data transmission method, a user terminal and network side equipment, wherein the method applied to the user terminal comprises the following steps: determining uplink resources transmitted by pre-configuration, timing advance TA transmitted by the pre-configuration resources and a time alignment timer for ensuring the validity of the timing advance; and before the time alignment timer expires, transmitting uplink data on the configured uplink resource by using the configured TA. The invention provides a scheduling-free uplink transmission mechanism, and utilizes TA saved by a user and an effective time alignment timer to solve the TA acquisition problem in the uplink pre-configuration resource transmission process and further reduce the random access and scheduling processes.

Description

Uplink data transmission method, user terminal and network side equipment

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to an uplink data transmission method, a user terminal, and a network device.

Background

The cellular-based narrowband Internet of Things (NB-IoT) is an important branch of the Internet of everything. NB-IoT is constructed in a cellular network, consumes only about 180KHz bandwidth, and can be directly deployed in a GSM (Global System for Mobile Communication), UMTS (Universal Mobile Telecommunications System), or LTE (long term Evolution) network, so as to reduce the deployment cost and achieve smooth upgrade.

NB-IoT is focused on the low power wide coverage (LPWA) internet of things (IoT) market, an emerging technology that is widely applicable worldwide. The method has the characteristics of wide coverage, multiple connections, low speed, low cost, low power consumption, excellent architecture and the like. The NB-IoT uses the License frequency band, can adopt three deployment modes of in-band, guard band or independent carrier, and coexists with the existing network. Because of the advantages of low power consumption, wide coverage, low cost, large capacity and the like of the NB-IoT, the NB-IoT can be widely applied to various vertical industries, such as remote meter reading, asset tracking, intelligent parking, intelligent agriculture and the like.

In the conventional NB-IoT communication process, a UE needs to communicate with a base station, and a random access process has to be completed regardless of the size of transmitted data, and the random access is a basic and important process in the LTE system, and the main purpose of the random access is as follows: 1) establishing uplink synchronization; 2) and establishing a unique terminal identifier C-RNTI (Cell Radio Network temporary identity) for requesting a Network to allocate uplink resources to the terminal. Therefore, the random access is not only used for initiating access, but also used for new cell access in a switching process, access after radio link failure, uplink synchronization recovery when uplink/downlink data are transmitted, uplink shared channel UL-SCH resource request and the like.

The random access process of the uplink of the LTE system adopts an asynchronous access mode, namely when a terminal does not obtain uplink time synchronization or loses synchronization, the random access process is used for the eNodeB to estimate and adjust the uplink transmission clock of the UE, and the process is also used for the UE to request resource allocation to the eNodeB. The eNodeB responds to the UE's non-synchronized random access attempt by transmitting time information to the UE to adjust uplink transmission timing and allocate uplink resources for transmitted data or control signaling, and the timing information and uplink data resource allocation may also be transmitted to the UE in combination. The random access procedure has two modes:

1) contention-based random access

In the LTE system, there are 64 available preamble sequences in each cell, and for a contention-based random access procedure, a UE randomly selects one preamble sequence to initiate a random access procedure to a network side device, so that if multiple UEs use the same preamble sequence to initiate a random access procedure at the same time, a collision occurs, which may result in an access failure.

In LTE, contention-based random access is mainly divided into 4 steps.

UE randomly selects a leader sequence and sends the leader sequence on an RACH (random Access channel) channel;

after detecting that the preamble sequence is sent, the enodeb sends a random access response in a downlink, where the random access response at least includes the following information: the number of the received preamble sequence; timing adjustment information; uplink resource location indication information allocated to the UE; C-RNTI temporarily allocated;

after receiving the random access response, the UE sends an uplink message on the allocated uplink resource according to the indication;

and d, the eNodeB receives the uplink message of the UE and returns a conflict resolution message to the UE which is successfully accessed.

2) Contention-free random access

The contention-free random access uses the leader sequence allocated by the eNodeB to initiate the random access process, so the access success rate is higher. However, considering that the eNodeB can know in advance that the UE needs to initiate the random access process only in two scenarios, i.e., handover or downlink data transmission, the eNodeB can use contention-free random access only in the two scenarios, and can only use contention-based random access for other application scenarios.

Compared with the contention-based random access process, the contention-free random access process implementation flow increases the process of allocating and sending a specific preamble sequence by the eNodeB, and reduces the process of conflict resolution, and the specific process is as follows:

a. in the downlink direction, the eNodeB assigns a dedicated random access preamble by dedicated signaling.

The ue sends the eNodeB assigned random access preamble on the RACH channel.

c, after detecting that the preamble sequence is sent, the enodeb sends a random access response in a downlink, wherein the random access response at least comprises the following information: numbering of leader sequences: timing adjustment information; and uplink resource location indication information allocated to the UE.

In the conventional NB-IoT communication process, after the random access process is completed, identity authentication is performed through signaling, and thus, the NB-IoT communication can be performed only after entering an RRC (Radio Resource Control) connection state, and at least 5 signaling interaction flows are required.

In order to reduce the power consumption of the terminal, 3GPP Release15 sets out an Early Data Transmission (EDT) mechanism, that is, a part of uplink data is carried in the Msg3 message of the random access procedure, but the EDT procedure still depends on the random access procedure.

Disclosure of Invention

The invention provides an uplink data transmission method, a user terminal and network side equipment, which are used for solving the problems that in the prior art, when uplink data are transmitted by UE, the UE needs to pass through a random access process and needs to perform processes such as resource allocation and scheduling, and the signaling interaction steps are multiple, so that the power consumption is high and the communication is not timely enough.

In a first aspect, the present invention provides an uplink data transmission method, applied to a user equipment UE, including:

determining a pre-configured resource for uplink transmission, and acquiring a timing advance TA (timing advance) for the uplink transmission of the pre-configured resource and a time alignment timer for ensuring the effectiveness of the timing advance TA;

and before the time alignment timer expires, utilizing the saved TA to perform uplink data transmission on the pre-configured resource.

In a second aspect, the present invention provides an uplink data transmission method, applied to a network side device, including:

pre-configuring resources for uplink data transmission for User Equipment (UE);

and receiving uplink data transmitted by the UE by utilizing the saved TA on the pre-configured resource before the time alignment timer expires according to the saved TA.

In a third aspect, an embodiment of the present invention provides a user equipment, including a processor and a memory, where the memory stores program codes, and when the program codes are executed by the processor, the processor is enabled to execute the steps of the uplink data transmission method applied to the user equipment.

In a fourth aspect, an embodiment of the present invention provides a network-side device, including a processor and a memory, where the memory stores program codes, and when the program codes are executed by the processor, the processor is caused to perform the following steps:

pre-configuring resources for uplink data transmission for User Equipment (UE);

In a fifth aspect, an embodiment of the present invention provides a user terminal, including:

a configuration determining unit, configured to determine a pre-configured resource for uplink transmission, and obtain a timing advance TA for the uplink transmission of the pre-configured resource and a time alignment timer for ensuring the validity of the timing advance TA;

and a data transmission unit, configured to perform uplink data transmission on a preconfigured resource by using the saved timing advance TA before the time alignment timer expires.

In a sixth aspect, the present invention provides a network side device, including:

a configuration unit, configured to pre-configure a resource for uplink data transmission for a user equipment UE;

and the data transmission unit is used for receiving uplink data transmitted by the UE according to the saved time alignment timer by utilizing the saved TA on the pre-configured resource before the time alignment timer expires.

The uplink data transmission method, the user terminal and the network side equipment provided by the invention have the following steps

Has the advantages that:

when the uplink data transmission is triggered, RRC connection does not need to be established through a random access process every time, the uplink data transmission is directly carried out by using the preconfigured resources, and the timing advance of the transmitted data is determined by using the stored TA, so that the synchronization of the data transmission at the eNB side is realized, the data transmission does not conflict with other UE (user equipment), the power consumption of equipment can be saved and the communication efficiency is improved because the signaling interaction in the random access process is not needed.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a flowchart illustrating an uplink data transmission method applied to a UE according to an embodiment of the present invention;

fig. 2 is a schematic flowchart of an uplink data transmission method for an application network side device according to an embodiment of the present invention;

fig. 3 is a structural diagram of a user terminal according to an embodiment of the present invention;

fig. 4 is a diagram of a network-side device structure according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides an uplink data transmission method which is applied to User Equipment (UE), and another uplink data transmission method which is applied to network side equipment.

The UE applied by the implementation method belongs to the NB-IoT terminal, and the NB-IoT terminal has higher requirements on the battery and the power consumption, and comprises meter equipment, an alarm, a tracker and other equipment.

The network side equipment applied by the implementation method can be a gNB, a macro base station, a micro base station and the like in an NB-IoT network.

The application scenario of the embodiment of the invention is an NB-IoT network scenario.

The application scenario described in the embodiment of the present invention is for more clearly illustrating the technical solution of the embodiment of the present invention, and does not form a limitation on the technical solution provided in the embodiment of the present invention, and it can be known by a person skilled in the art that with the occurrence of a new application scenario, the technical solution provided in the embodiment of the present invention is also applicable to similar technical problems.

The present embodiment provides an uplink data transmission method, which is applied to a user equipment UE, and as shown in fig. 1, the method includes:

step 101, determining a pre-configured transmitted uplink resource, a pre-configured resource transmitted Timing Advance (TA) and a time alignment timer for ensuring the validity of the TA;

and 102, before the time alignment timer expires, transmitting uplink data on a pre-configured resource by using the saved timing advance TA.

When the uplink data transmission is triggered by utilizing the uplink number provided by the embodiment of the invention, RRC connection does not need to be established through a random access process every time, the uplink data transmission is directly carried out by utilizing the preconfigured resources, and the timing advance of the transmitted data is determined by utilizing the stored TA, so that the synchronization of the data transmission at the eNB side is realized, the conflict with other UE is avoided, the power consumption of equipment can be saved and the communication efficiency is improved because the signaling interaction in the random access process is not needed.

Optionally, the triggering of uplink data transmission may be a scenario as follows:

the UE is in a radio resource control IDLE RRC _ IDLE state and needs to establish an RRC connection with the network side device to transmit data.

Optionally, the preconfigured resource, specifically, the uplink time-frequency resource, may be information such as a modulation and coding scheme MCS, a transport block size TBS, and a time-frequency resource location required for uplink data transmission;

an important feature of uplink transmission is that different UEs have orthogonal multiple access (orthogonal multiple access) in time and frequency, i.e. uplink transmissions from different UEs in the same cell do not interfere with each other.

In the embodiment of the invention, when the uplink data transmission is triggered in any scene, whether the uplink TA is stored or not is judged firstly, if so, the stored TA is directly used for realizing data transmission, and the data synchronization with the eNB is realized.

As a possible implementation manner, determining the preconfigured resource for uplink data transmission may be implemented in any manner of:

the method comprises the steps that firstly, pre-configured resources used for uplink data transmission are determined through system messages broadcasted by a network side;

before triggering the uplink data transmission, the network side device will continuously broadcast the system message.

In this embodiment, the eNB may carry the uplink resource allocated to the UE through the broadcasted system message, so as to pre-configure the resource for uplink data transmission for the UE.

When the system message is adopted to pre-configure the resource for the UE, the UE identifier can be carried or not carried.

Secondly, when RRC connection is established with the network side equipment, the network side equipment determines pre-configured resources for uplink transmission through uplink resources indicated by RRC signaling;

before triggering uplink data transmission, the UE establishes RRC connection with the network side equipment, and the network side equipment pre-configures resources for the UE for uplink data transmission through RRC signaling.

After that, the RRC connection is released, but the resource pre-configured for the UE for uplink data transmission is not released, and is used as the pre-configured resource for the next uplink data transmission.

The network side device may pre-configure the resource for the UE through the RRC signaling in each RRC connection procedure, or not in each RRC connection procedure according to the requirement, and the UE saves the resource when receiving the pre-configured resource.

Before triggering uplink data transmission, a random access procedure RACH or an EDT procedure for data advanced transmission is performed between the UE and the network side device, that is, an RRC connection is established before, according to an existing RACH or EDT interaction manner, the network side determines an uplink timing advance TA for the terminal UE according to uplink transmission, in this embodiment, an uplink resource allocated to the UE by the network side device in the RACH or EDT is used as a configured uplink resource (TA) and a TA timer to be stored, and when the RRC connection is released, the configured uplink resource (TA) and the TA timer are not released.

As a possible implementation, the method further comprises:

and when the uplink data transmission by using the pre-configured resources fails, initiating a random access process/an EDT process for data transmission in advance.

And if the pre-configuration resource is determined by adopting the second mode, performing RRC connection at least once through the existing random access process.

As an optional implementation manner, the saved timing advance TA may be obtained by adopting any one of the following manners:

in the first mode, the network side equipment configures the TA through the random access process/the EDT process, and the user terminal determines and stores the configured TA.

In order to ensure orthogonality of uplink transmissions and avoid intra-cell (intra-cell) interference, the network side equipment eNodeB requires that the times of arrival at the eNodeB of signals from different UEs in the same subframe but in different frequency domain resources (different RBs) are substantially aligned. The eNodeB can correctly decode the uplink data as long as it receives the uplink data sent by the UE within the CP (cyclic prefix), so that the uplink synchronization requires that the time of arrival of signals from different UEs in the same subframe to the eNodeB all fall within the CP.

In order to ensure time synchronization on the receiving side (eNodeB side), LTE proposes an uplink timing Advance (uplink timing Advance) mechanism.

From the UE side, the timing advance TA is essentially a negative offset (negative offset) between the starting time of receiving the downlink subframe and the time of transmitting the uplink subframe. The eNodeB can control the arrival time of uplink signals from different UEs at the eNodeB by appropriately controlling the offset of each UE. For a UE farther from the eNodeB, due to a larger transmission delay, the UE closer to the eNodeB is required to transmit uplink data earlier.

In this embodiment, if the UE and the network side device execute a random access process, in the random access process, the eNodeB determines the TA value by measuring the received preamble, and sends the TA value to the UE through the Timing Advance Command field (total 11 bits, and the range of the corresponding TA index value is 0 to 1282) of the RAR. The present embodiment saves this TA as the configured TA.

Optionally, when it is determined that there is no configured TA, initiating a random access procedure/EDT, and determining the configured TA through the random access procedure/EDT.

In the second mode, the network side equipment configures the TA in the RRC connection state, and the user terminal determines and stores the configured TA;

if the UE is in RRC _ CONNECTED state, i.e. the UE has performed the random access procedure/EDT procedure to enter RRC _ CONNECTED state, the eNodeB needs to maintain TA information.

Although the UE and the eNodeB are synchronized uplink during the random access procedure, the timing of the uplink signal arriving at the eNodeB may change over time due to several reasons:

UEs moving at high speed, such as UEs on high-speed rails in operation, have varying transmission delays with the eNodeB;

the current transmission path disappears and the new transmission path is switched to. This is likely to happen, for example, in cities with dense buildings, when walking to corners of the building;

the crystal oscillator offset and long-time offset accumulation of the UE can cause uplink timing errors;

doppler shift due to UE movement, etc.

Therefore, the UE needs to continuously update its uplink TA to maintain uplink synchronization. In RRC _ CONNECTED state, the eNodeB uses a closed-loop mechanism to adjust the uplink timing advance.

The eNodeB determines the TA value for each UE based on measuring uplink transmissions for the corresponding UE. Thus, the eNodeB can be used to estimate the TA value as long as the UE has uplink transmissions. In theory, any signal transmitted by the UE (SRS/DMRS/CQI/ACK/NACK/PUSCH, etc.) can be used to measure the TA.

This embodiment saves the eNodeB updated TA as the configured TA, which will not be released even if the RRC connection is released.

For the UE transmitting data on the uplink configuration resource, since the UE does not perform the random access procedure and cannot obtain the timing advance before transmitting the uplink data, the present embodiment proposes to store the TA value in the RRC _ CONNECTED state for uplink transmission of the uplink configuration resource in the RRC _ IDLE state.

Further, when the synchronization of the uplink data transmission fails by using the saved TA, a random access process/data advanced transmission EDT is initiated.

As a possible implementation, determining a configured time alignment timer includes:

the configured time alignment timer is determined through a random access procedure/data advance transmission (EDT) procedure or the configured time alignment timer in an RRC connection state.

After the time alignment timer is overtime, if the UE does not receive an updated TA from the eNB, the TA is considered to be an invalid TA, and the UE is considered to be out of synchronization.

And when the time alignment timer is overtime, initiating a random access process/data advanced transmission EDT, and acquiring the configured uplink resource, TA and the time alignment timer again through the random access process/data advanced transmission EDT.

In the RRC connected state, the eNodeB configures a time alignment timer through the RRC signaling sent to the UE, and the UE uses the time alignment timer to determine whether uplink transmission is synchronized in the MAC layer. When the UE receives the timing advance command, the UE will start or restart the timer. If the timer expires, the UE is considered to be out of synchronization in the uplink, and if the UE needs to continue to transmit UL data, a random access procedure RACH/EDT will be triggered.

In a conventional system, when leaving the RRC _ CONNECTED state and entering the RRC _ IDLE state, the UE releases the TA value and the time alignment timer, and in this embodiment, the indicated TA value and the time alignment timer are used as the configured TA and time alignment timer, and are not released.

As mentioned above, the main factors affecting TA include changes in transmission delay due to UE mobility, doppler shift, link switching, and drift of UE crystal oscillation, all three of which are due to UE motion. Therefore, the parameter value of the timeAlignmentTimer can be designed according to the mobility of the UE.

As an optional implementation manner, when establishing an RRC connection with a network side device, determining a configured time alignment timer according to a time alignment timer indicated by the network side device includes:

when RRC connection is established with network side equipment, the network side equipment determines a configured time alignment timer according to the time alignment timer indicated by the mobility of the user terminal;

the network side equipment determines the timing duration of the time alignment timer according to the mobility of the user terminal, wherein the lower the mobility of the user terminal is, the longer the determined timing duration of the time alignment timer is, the higher the mobility of the user terminal is, and the shorter the determined timing duration of the time alignment timer is.

In implementation, the mobility of the mobile terminal is determined according to the moving speed of the user terminal, the faster the moving speed is, the higher the mobility is, the slower the moving speed is, and the lower the mobility is, specifically, when the moving speed is zero, the mobility is zero, and when the moving speed is not zero but is less than a certain set moving speed, the mobile terminal is moving at a low speed, otherwise, the mobile terminal is moving at a high speed. When the mobility of the user is determined to be zero, the timing duration of the indicated time alignment timer is greater than a first set value, when the mobility of the user terminal is determined to be low-speed movement, the timing duration of the indicated time alignment timer is greater than a second set value and smaller than the first set value, and when the mobility of the user terminal is determined to be high-speed movement, the timing duration of the indicated time alignment timer is smaller than the second set value. The first set value is larger than the second set value.

Specifically, for the UE with a fixed and unchangeable position, the mobility is zero, the UE may be a water, electricity, gas meter or the like, TA is basically unchanged, a timeAlignmentTimer parameter can be configured to be very long time, even to be "infinite", the time validity is very long, and the uplink data resource transmission of the UE can be basically satisfied; for the UE moving at a low speed, such as warehouse object tracking, the TA changes infrequently, the timeAlignmentTimer parameter setting may be set according to the time interval at which the TA changes, and the larger the time interval, the longer the timing duration of the set time alignment timer.

For a UE moving at a high speed, such as logistics tracking, the TA changes frequently, and therefore it is not suitable to store the TA in a connected state, which requires a conventional random access procedure or EDT procedure.

In the conventional system, the UE releases the TA value and the time alignment timer when leaving the RRC _ CONNECTED state and entering the RRC _ IDLE state, but the embodiment proposes to store the RRC _ CONNECTED lower time alignment timer for uplink transmission of the uplink pre-configured resource in the RRC _ IDLE state.

Based on the uplink data transmission method provided in the foregoing embodiment, an embodiment of the present invention further provides a retransmission mechanism for data transmission in UL preconfigured resources based on eNB feedback, and specifically, the method further includes:

receiving an Acknowledgement (ACK) message sent by a network side device through a Narrowband Physical Downlink Control Channel (NPDCCH) after successfully detecting and decoding uplink data;

receiving a Negative Acknowledgement (NACK) message sent by an NPDCCH after network side equipment unsuccessfully decodes uplink data;

and after receiving the uplink data which is not successfully detected by the network side equipment, initiating a random access process/an EDT process for data transmission in advance.

The network side device may feed back the ACK message/NACK message in the downlink control information format DCI N0 through NPDCCH.

As a possible implementation, the method further comprises:

after receiving the uplink data which is not successfully decoded by the network side equipment, the network side equipment feeds back the reallocated preconfigured resources through the NPDCCH, that is, the network side equipment feeds back the NACK message and feeds back the reallocated preconfigured resources at the same time, and specifically, the network side equipment may feed back the reallocated preconfigured resources in a downlink control information format DCI N0;

and carrying out uplink data retransmission on the reallocated pre-configured resources.

As an optional implementation, the method further comprises:

and when the uplink data is determined to be sent and the NACK/ACK message fed back by the network side equipment is not received after the set time is exceeded, initiating a random access process or an EDT process for data transmission in advance.

The specific HARQ process is as follows:

according to the uplink data transmission mode provided by the embodiment, the UE sends data to the eNB on the pre-configured resource;

after receiving the data, the eNB sends downlink control information DCI to the UE through the NPDCCH, and according to the receiving condition of the data, the eNB has the following three processing modes:

case1, eNB decodes data successfully, sends ACK message in DCI N0 through NPDCCH;

case2: eNB fails to decode data, which may be due to multiple UEs colliding, eNB sends NACK message in DCIN0 over NPDCCH and carries the reallocated pre-configured resources in DCI N0.

The reallocated pre-configured resource may be information such as a Modulation and Coding Scheme (MCS) and a Transport Block Size (TBS) required for the UE to retransmit data, and the UE may transmit the new pre-configured resource.

Or the uplink data is not successfully detected, conventional random access procedure RACH is performed on DCI N1 through NPDCCH.

case3 the eNB does not detect data, and as for what is not sent, the UE initiates a RACH (Random Access CHannel) or EDT procedure after monitoring NPDCCH for a period of time.

According to another embodiment of the present invention, an uplink data transmission method is provided, which is applied to a network side device, as shown in fig. 2, and includes:

step 201, pre-configuring resources for uplink data transmission for User Equipment (UE);

step 202, receiving uplink data transmitted by the UE using the saved timing advance TA on the preconfigured resource before the time alignment timer expires according to the saved time alignment timer.

Optionally, pre-configuring resources for uplink data transmission for the UE includes:

pre-configuring resources for uplink data transmission for the UE through the broadcasted system message; or

When establishing RRC connection with the UE, pre-configuring resources for uplink data transmission for the UE through the sent RRC signaling.

Optionally, the step of configuring, by the network side device, the timing advance TA for the UE includes:

and configuring a timing advance TA for the UE in an EDT (enhanced data transport) or RRC (radio resource control) connection state in a random access process/data advance transmission (EDT).

Optionally, the step of configuring, by the network side device, the time alignment timer stored by the UE for the UE, where the network side device configures the time alignment timer for the UE, includes:

configuring a time alignment timer for the UE through an EDT (enhanced data transport) process of random access process/data advance transmission or in an RRC (radio resource control) connection state.

Optionally, the time alignment timer configured in the RRC connected state is a time alignment timer configured according to the mobility of the UE, and the lower the mobility of the UE is, the longer the timing duration of the configured time alignment timer is.

Optionally, the method further comprises:

after successfully detecting and decoding the uplink data, sending an ACK (acknowledgement) message to the UE through a narrowband physical downlink control channel NPDCCH (network physical downlink control channel); or

After the uplink data is not successfully decoded, a Negative Acknowledgement (NACK) message is sent to the UE through an NPDCCH; or

And starting to initiate a random access process/an EDT process for data transmission in advance after the uplink data is not successfully detected.

Optionally, the method further comprises:

after the uplink data is not successfully decoded, pre-configured resources reallocated for the UE are sent through the NPDCCH;

and receiving uplink data retransmitted by the UE on the reallocated pre-configured resources.

In the uplink pre-configured resource transmission, because a random access process and an uplink resource scheduling process are not carried out, and the Timing Advance (TA) can not be obtained immediately before data transmission, the embodiment of the invention solves the TA acquisition problem and the retransmission (HARQ) problem in the uplink pre-configured resource transmission process according to the scheme of TA validity judgment and retransmission (HARQ) process.

Example two

Based on the same inventive concept, embodiments of the present invention provide a user terminal, where the user terminal is a sending device for performing uplink data transmission in embodiments of the present invention, and a principle of the user terminal for solving the problem is similar to that of the uplink data transmission method, so that the implementation of the user terminal may refer to the implementation of the method, and repeated details are not repeated.

The UE comprises a processor and a memory, wherein the memory stores program codes, and when the program codes are executed by the processor, the processor is enabled to execute the steps of the uplink data transmission method applied to the UE in the above embodiments.

In particular, the processor is configured to: determining a pre-configured resource for uplink transmission, and acquiring a timing advance TA (timing advance) for the uplink transmission of the pre-configured resource and a time alignment timer for ensuring the effectiveness of the timing advance TA;

Optionally, the processor is specifically configured to:

determining a pre-configured resource for uplink transmission through a system message broadcasted by network side equipment; or

When RRC connection is established with the network side equipment, the network side equipment determines the pre-configured resource for uplink transmission through the uplink resource indicated by RRC signaling.

Optionally, the processor is further configured to:

and when the pre-configured resource fails to transmit uplink data, initiating a random access process/an EDT process for transmitting data in advance.

Optionally, the processor is specifically configured to:

the user terminal determines and stores the configured TA by configuring the TA in the random access process/data advance transmission EDT process or the RRC connection state.

Optionally, the processor is further configured to:

when the stored TA is not acquired, initiating a random access process/data early transmission (EDT); or

When the time alignment timer is overtime, initiating a random access process/data advanced transmission (EDT); or

And when the uplink data transmission fails by utilizing the stored TA, initiating a random access process/data early transmission (EDT).

Optionally, the processor is specifically configured to:

the user terminal determines and saves the configured time alignment timer through a random access procedure/data advance transmission EDT procedure or configuring the time alignment timer in an RRC connected state.

Optionally, the time alignment timer configured in the RRC connected state is a time alignment timer configured by the network side device according to the mobility of the user equipment UE, and the lower the mobility of the user equipment UE is, the longer the timing duration of the configured time alignment timer is.

Optionally, the processor is further configured to:

receiving an Acknowledgement (ACK) message sent by a network side device through a Narrowband Physical Downlink Control Channel (NPDCCH) after successfully detecting and decoding uplink data; or

Optionally, the processor is further configured to:

receiving the reallocated uplink resource sent by the NPDCCH after the network side equipment unsuccessfully decodes the uplink data;

and retransmitting the uplink data on the reallocated configured uplink resources.

Optionally, the processor is further configured to:

Based on the same inventive concept, embodiments of the present invention provide a network side device, where the network side device is a receiving device for performing uplink data transmission in embodiments of the present invention, and a principle of the device for solving the problem is similar to that of the uplink data transmission method, so that reference may be made to implementation of the method for implementing the device, and repeated details are not described here.

The network side device includes a processor and a memory, where the memory stores a program code, and when the program code is executed by the processor, the processor is caused to apply the steps of the uplink data transmission method applied to the network side device in the above embodiment.

In particular, the processor is configured to: pre-configuring resources for uplink data transmission for User Equipment (UE); and receiving uplink data transmitted by the UE by utilizing the saved TA on the pre-configured resource before the time alignment timer expires according to the saved TA.

Optionally, the processor is specifically configured to:

The configured time alignment timer in the RRC connected state is a time alignment timer configured according to the mobility of the UE, and the lower the mobility of the UE is, the longer the timing duration of the configured time alignment timer is.

Optionally, the processor is further configured to:

And starting to initiate a random access process/an EDT process for data transmission in advance after the uplink data is not successfully detected. .

Optionally, the processor is further configured to:

and receiving uplink data retransmitted by the UE on the reallocated pre-configured uplink resources.

An embodiment of the present invention further provides a user terminal, as shown in fig. 3, including:

a configuration determining unit 301, configured to determine a preconfigured resource for uplink transmission, and obtain a timing advance TA for uplink transmission of the preconfigured resource and a time alignment timer for ensuring validity of the timing advance TA;

a data transmission unit 302, configured to perform uplink data transmission on the pre-configured resource by using the saved timing advance TA before the time alignment timer expires.

Optionally, the configuration determining unit 301 determines the preconfigured resource, specifically to:

Optionally, the data transmission unit is further configured to:

Optionally, the acquiring, by the configuration determining unit, the saved timing advance TA includes:

Optionally, the data transmission unit is further configured to:

Optionally, the configuration determining unit obtains the saved time alignment timer, and includes:

Optionally, the user terminal further includes:

a feedback receiving unit 303, configured to receive an ACK message sent by a network side device through a narrowband physical downlink control channel NPDCCH after successfully detecting and decoding uplink data; or

Optionally, the feedback receiving unit is further configured to:

receiving the reallocated pre-configured uplink resources sent by the NPDCCH after the network side equipment unsuccessfully decodes the uplink data;

and the data retransmission unit is used for carrying out uplink data retransmission on the reallocated preconfigured uplink resources.

Optionally, the data transmission unit is further configured to initiate a random access procedure or an EDT procedure for data early transmission when it is determined that the uplink data is sent and NACK/ACK messages fed back by the network side device are not received after the set time.

According to another embodiment of the present invention, there is also provided a network side device, as shown in fig. 4, including:

a configuration unit 401, which pre-configures resources for uplink data transmission for a user equipment UE;

a data transmission unit 402, configured to receive uplink data transmitted by the UE according to the saved time alignment timer by using the saved timing advance TA on the preconfigured resource before the time alignment timer expires.

Optionally, the configuring unit pre-configures, for the UE, resources for uplink data transmission, including:

Optionally, the configuration unit is further configured to:

Optionally, the network side device further includes:

a feedback unit 403, configured to send an ACK message to the UE through a narrowband physical downlink control channel NPDCCH after successfully detecting and decoding the uplink data; or

Optionally, the feedback unit is further configured to:

and the data transmission unit is used for receiving the uplink data retransmitted by the UE on the reallocated pre-configured resources.

The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.

Accordingly, the subject application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. An uplink data transmission method is applied to a User Equipment (UE), and is characterized by comprising the following steps:

2. The method of claim 1, wherein determining pre-configured resources for uplink transmission comprises:

determining a pre-configured resource for uplink transmission through a system message broadcasted by network side equipment; or when the RRC connection is established with the network side equipment, the network side equipment determines the pre-configured resource for uplink transmission through the uplink resource indicated by the RRC signaling.

3. The method of claim 1, further comprising:

4. The method of claim 1, wherein obtaining a saved Timing Advance (TA) comprises:

5. The method of claim 4, further comprising:

When the time alignment timer is overtime, initiating a random access process/data advanced transmission (EDT); or when the uplink data transmission by using the stored TA fails, initiating a random access process/data early transmission (EDT).

6. The method of claim 1, wherein obtaining a saved time alignment timer comprises:

7. The method according to claim 6, wherein the configured time alignment timer in the RRC connected state is a time alignment timer configured by the network side device according to the mobility of the UE, and the lower the mobility of the UE is, the longer the timing duration of the configured time alignment timer is.

8. The method of any of claims 1 to 7, further comprising:

9. The method of claim 8, further comprising:

receiving the reallocated pre-configured resources sent by the NPDCCH after the network side equipment unsuccessfully decodes the uplink data;

10. The method of claim 8, further comprising:

11. An uplink data transmission method is applied to a network side device, and is characterized by comprising the following steps:

pre-configuring resources for uplink data transmission for User Equipment (UE);

12. A user terminal, UE, comprising a processor and a memory, the memory storing program code which, when executed by the processor, causes the processor to perform the steps of the method of any of claims 1 to 10.

13. A network-side device comprising a processor and a memory, the memory storing program code that, when executed by the processor, causes the processor to perform the steps of:

pre-configuring resources for uplink data transmission for User Equipment (UE);