CN115175359A

CN115175359A - Scheduling-free data transmission method and device of wireless time division duplex system

Info

Publication number: CN115175359A
Application number: CN202210974002.5A
Authority: CN
Inventors: 倪浩; 毛敏; 孙涛; 聂聪
Original assignee: Beijing Neuron Network Technology Co ltd
Current assignee: Beijing Neuron Network Technology Co ltd
Priority date: 2022-08-15
Filing date: 2022-08-15
Publication date: 2022-10-11

Abstract

The embodiment of the application relates to the technical field of communication, in particular to a scheduling-free data transmission method and device of a wireless time division duplex system. The specific scheme is as follows: dividing user terminal groups aiming at a specific user terminal, wherein the specific user terminal is a user terminal with specific time delay and specific data flow demand service; uplink time-frequency resources used for scheduling-free uplink data transmission are configured for the user terminal groups; and sending indication information to a specific user terminal in the user terminal grouping based on a semi-static signaling mode, wherein the indication information is used for indicating the specific user terminal in the user terminal grouping to transmit uplink data by utilizing the uplink time-frequency resource. According to the embodiment of the application, the user terminals with smaller mutual interference share the time-frequency resources by grouping the user terminals, so that the transmission delay caused by a signaling process can be reduced, and the high utilization rate of system resources is kept while the high-delay sensitive service is served.

Description

Scheduling-free data transmission method and device of wireless time division duplex system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a scheduling-free data transmission method and apparatus for a wireless time division duplex system.

Background

The main duplex system in the wireless communication system mainly includes: time division duplex systems, frequency division duplex systems, etc. The wireless time division duplex system is characterized in that uplink transmission and downlink transmission respectively occupy non-overlapping time slices, thereby avoiding mutual interference of the uplink transmission and the downlink transmission. When the user terminal has data to transmit to the base station, scheduling Request (SR) information may be sent in an Uplink Control Channel (PUCCH), and an Uplink transmission process is triggered through the SR to request the base station to perform Uplink transmission scheduling. The process that the user terminal applies for the PUSCH resource through the SR brings the interactive process of the uplink and downlink signaling, resulting in larger transmission delay. The base station side can reduce the transmission delay caused by the signaling process by configuring the predefined semi-continuous time frequency resource for the user terminal. However, for a user terminal with burst characteristics or non-uniform time domain distribution of data, the manner of configuring the time-frequency resources for the user terminal usually results in a decrease in the utilization rate of system resources and a low communication efficiency.

Disclosure of Invention

In view of the above problems in the prior art, embodiments of the present application provide a scheduling-free data transmission method and apparatus for a wireless time division duplex system, so that user terminals with small mutual interference share time-frequency resources by grouping the user terminals, transmission delay caused by a signaling process can be reduced, and a high utilization rate of system resources is maintained while a high delay sensitive service is served.

In order to achieve the above object, a first aspect of the present application provides a scheduling-free data transmission method for a wireless time division duplex system, including:

dividing user terminal groups aiming at a specific user terminal, wherein the specific user terminal is a user terminal with specific time delay and specific data flow demand service;

uplink time-frequency resources used for scheduling-free uplink data transmission are configured for the user terminal groups;

and sending indication information to a specific user terminal in the user terminal grouping based on a semi-static signaling mode, wherein the indication information is used for indicating the specific user terminal in the user terminal grouping to transmit uplink data by utilizing the uplink time-frequency resource.

As a possible implementation manner of the first aspect, the specific ue further includes at least one of:

a user terminal having a logical channel with a specific identification number;

a user terminal having a logical channel group with a specific identification number;

wherein the logical channels and logical channel groups indicated by the specific identification number correspond to services with specific time delay and specific data traffic requirements.

As a possible implementation manner of the first aspect, the specific delay includes that the data delay is lower than a first set threshold; the specific data traffic requirement comprises that the maximum data burst amount is lower than a second set threshold.

As a possible implementation manner of the first aspect, the dividing the user terminal groups for a specific user terminal includes:

measuring uplink channel characteristics from each specific user terminal to the base station by using an uplink sounding reference signal and/or an uplink demodulation reference signal;

calculating a correlation value between any two specific user terminals according to the uplink channel characteristics;

and dividing the specific user terminal into at least one user terminal group according to the correlation value.

As a possible implementation manner of the first aspect, the dividing the specific ue into at least one ue group according to the correlation value includes:

selecting a minimum correlation value from correlation values between the specific user terminals which are not grouped, and dividing two specific user terminals corresponding to the minimum correlation value into a set current group;

selecting specific user terminals meeting preset conditions from the specific user terminals which are not grouped and dividing the specific user terminals into the current groups; wherein the preset conditions include: the square sum of the correlation values of the selected specific user terminal and all the specific user terminals in the current group is minimum, and the correlation values of the selected specific user terminal and all the specific user terminals in the current group are not more than a third set threshold value;

under the condition that the number of the specific user terminals in the current grouping is smaller than a fourth set threshold and the specific user terminals which meet preset conditions exist in the specific user terminals which are not grouped, repeatedly executing the step of selecting the specific user terminals which meet the preset conditions and dividing the specific user terminals into the current grouping;

and under the condition that the number of the specific user terminals in the current grouping reaches a fourth set threshold value or no specific user terminals meeting preset conditions exist in the specific user terminals which are not grouped, turning to the step of selecting the minimum correlation value from the correlation values among the specific user terminals which are not grouped, and dividing the specific user terminals which are not grouped into the newly-established current grouping.

As a possible implementation manner of the first aspect, the method further includes:

and notifying all the specific user terminals in each user terminal group of the user terminals of the group identification number based on a dynamic mode of a downlink control channel or a semi-static mode based on high-level signaling.

As a possible implementation manner of the first aspect, the indication information includes: taking time slots with set number as a set period, taking each uplink time slot in the set period as the uplink time-frequency resource, and indicating the allocation condition of the resource blocks of the uplink time-frequency resource in a bitmap or resource block sequence number mode; and/or the presence of a gas in the gas,

the indication information includes: indicating the Qos level identification of a service with a specific delay and a specific data traffic demand, or the identification of said logical channel or group of logical channels.

As a possible implementation manner of the first aspect, the indication information includes:

indicating the spreading sequence used for transmission for all specific user terminals in each of said user terminal groups.

and under the condition that the uplink time-frequency resources are idle, scheduling other user terminals except the specific user terminal to multiplex the uplink time-frequency resources.

A second aspect of the present application provides a scheduling-free data transmission apparatus of a wireless time division duplex system, including:

a grouping unit to: dividing user terminal groups aiming at a specific user terminal, wherein the specific user terminal is a user terminal with specific time delay and specific data flow demand service;

a configuration unit for: uplink time-frequency resources used for scheduling-free uplink data transmission are configured for the user terminal groups;

an indication unit for: and sending indication information to a specific user terminal in the user terminal grouping based on a semi-static signaling mode, wherein the indication information is used for indicating the specific user terminal in the user terminal grouping to transmit uplink data by utilizing the uplink time-frequency resource.

As a possible implementation manner of the second aspect, the specific ue further includes at least one of:

a user terminal having a logical channel with a specific identification number;

As a possible implementation manner of the second aspect, the specific delay includes that the data delay is lower than a first set threshold; the specific data traffic requirement comprises that the maximum data burst amount is lower than a second set threshold.

As a possible implementation manner of the second aspect, the grouping unit includes:

a measurement subunit to: measuring uplink channel characteristics from each specific user terminal to the base station by using an uplink sounding reference signal and/or an uplink demodulation reference signal;

a calculation subunit for: calculating a correlation value between any two specific user terminals according to the uplink channel characteristics;

a partition subunit to: and dividing the specific user terminal into at least one user terminal group according to the correlation value.

As a possible implementation manner of the second aspect, the molecular dividing unit is configured to:

As a possible implementation manner of the second aspect, the indication unit is further configured to:

As a possible implementation manner of the second aspect, the indication information includes: taking time slots with set number as a set period, taking each uplink time slot in the set period as the uplink time-frequency resource, and indicating the allocation condition of the resource blocks of the uplink time-frequency resource in a bitmap or resource block sequence number mode; and/or the presence of a gas in the gas,

the indication information includes: indicating the Qos level identification of the service with a specific delay and a specific data traffic demand, or the identification of the logical channel or logical channel group.

As a possible implementation manner of the second aspect, the indication information includes:

As a possible implementation manner of the second aspect, the apparatus further includes a scheduling unit, where the scheduling unit is configured to:

and under the condition that the uplink time-frequency resource is idle, scheduling other user terminals except the specific user terminal to multiplex the uplink time-frequency resource.

A third aspect of the present application provides a computing device comprising:

a communication interface;

at least one processor coupled with the communication interface; and

at least one memory coupled to the processor and storing program instructions that, when executed by the at least one processor, cause the at least one processor to perform the method of any of the first aspects.

A fourth aspect of the present application provides a computer readable storage medium having stored thereon program instructions that, when executed by a computer, cause the computer to perform the method of any of the first aspects described above.

These and other aspects of the invention will be apparent from and elucidated with reference to the embodiment(s) described hereinafter.

Drawings

The various features and the connections between the various features of the present invention are further described below with reference to the attached figures. The figures are exemplary, some features are not shown to scale, and some of the figures may omit features that are conventional in the art to which the application relates and are not essential to the application, or show additional features that are not essential to the application, and the combination of features shown in the figures is not intended to limit the application. In addition, the same reference numerals are used throughout the specification to designate the same components. The specific drawings are illustrated as follows:

fig. 1 is a schematic diagram of uplink transmission timing;

fig. 2 is a schematic diagram illustrating an embodiment of a scheduling-free data transmission method of a wireless time division duplex system according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of an embodiment of a scheduling-free data transmission apparatus of a wireless time division duplex system according to the present application;

fig. 4 is a schematic diagram of an embodiment of a scheduling-free data transmission apparatus of a wireless time division duplex system according to the present application;

fig. 5 is a schematic diagram of an embodiment of a scheduling-free data transmission apparatus of a wireless time division duplex system according to the present application;

fig. 6 is a schematic diagram of a computing device provided in an embodiment of the present application.

Detailed Description

The terms "first, second, third, etc. in the description and in the claims, or the like, may be used solely to distinguish one from another and are not intended to imply a particular order to the objects, but rather are to be construed in a manner that permits interchanging particular sequences or orderings where permissible such that embodiments of the present application may be practiced otherwise than as specifically illustrated or described herein.

In the following description, reference numbers indicating steps, such as S110, S120 … …, etc., do not necessarily indicate that the steps are executed in this order, and the order of the preceding and following steps may be interchanged or executed simultaneously, if permitted.

The term "comprising" as used in the specification and claims should not be construed as being limited to the contents listed thereafter; it does not exclude other elements or steps. It should therefore be interpreted as specifying the presence of the stated features, integers, steps or components as referred to, but does not preclude the presence or addition of one or more other features, integers, steps or components, and groups thereof. Thus, the expression "an apparatus comprising the devices a and B" should not be limited to an apparatus consisting of only the components a and B.

Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment, but may. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments, as would be apparent to one of ordinary skill in the art from this disclosure.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In the case of inconsistency, the meaning described in the present specification or the meaning derived from the content described in the present specification shall control. In addition, the terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the present application. To accurately describe the technical content in the present application and to accurately understand the present invention, terms used in the present specification are given the following explanation or definition before describing the specific embodiments:

1) Qos (Quality of Service): the network can provide better service capability for specified network communication by utilizing various basic technologies, is a safety mechanism of the network, and is a technology for solving the problems of network delay, network congestion and the like. QoS guarantees are important for capacity-limited networks, especially for streaming multimedia applications, which often require fixed transmission rates and are sensitive to delay.

2) QCI (QoS Class Identifier, qoS Class identity): is a scale value used to measure the packet forwarding behavior (e.g., packet loss rate, packet delay budget) of a particular Service Data Flow (SDF). The method is simultaneously applied to GBR (Guaranteed Bit Rate) and Non-GBR (Non-Guaranteed Bit Rate) bearers, and is used for specifying a control bearer level packet forwarding mode defined in an access node, such as scheduling weight, admission threshold, queue management threshold, link layer protocol configuration and the like. These are pre-configured into the access network node by the operator.

3) bitmap (bitmap): storing a certain state with each bit is suitable for large-scale data, but the data state is not much. Generally, it is used to determine whether there is any data.

4) Air interface: is commonly known as the air interface. Among wireless communication technologies, the "air interface" defines the technical specification of an electric wave link between a terminal device and a network device, making wireless communication as reliable as wire communication. In mobile transmissions, the air interface is a connection between a mobile subscriber and a base station via wireless communications. In a mobile phone, the air interface represents a radio transmission specification between a base station and a mobile phone, which defines the frequency and bandwidth of use of each radio channel, or defines the coding method employed. In 5G and LTE (Long Term Evolution), air interface transmission is an interface between a terminal and an access network, which is called an air interface for short, for example, a wireless interface between a mobile phone and a base station.

5) FR (Frequency Range): the 5G spectrum is divided into two regions FR1 and FR2. The frequency range of FR1 is 450MHz to 6GHz, also known as: sub 6GHz (band below 6 GHz). The frequency range of FR2 is 24.25GHz to 52.6GHz, also known as: millimeter wave (mmWave).

6) And (3) spreading frequency: spread spectrum communication is a process of information transmission by using a pseudo random code independent of information to spread the spectrum width of a modulated signal much wider than the bandwidth of the original modulated signal. The spreading of the frequency band is accomplished by a separate code sequence, which is implemented by means of coding and modulation, independent of the information data being transmitted. And at the receiving end, the same code is used for carrying out related synchronous receiving, despreading and recovering the transmitted information data. Spreading uses a spreading code sequence, which is a binary sequence of spreading codes, and is a very narrow pulse code sequence, and the code rate is very high.

The prior art method is described first, and then the technical solution of the present application is described in detail.

The main duplex system in the wireless communication system includes: time division duplex systems, frequency division duplex systems, etc. Taking a wireless cellular communication system as an example, a 2G communication system is a time division duplex system; a WCDMA (Wideband Code Division Multiple Access) communication system is a frequency Division duplex system; both the 4G LTE (Long Term Evolution) communication system and the 5G communication system include time division duplex and frequency division duplex.

The wireless time division duplex system is characterized in that uplink transmission and downlink transmission respectively occupy non-overlapping time slices, thereby avoiding mutual interference of the uplink transmission and the downlink transmission.

When the base station has data to transmit to the terminal, the base station sends Downlink scheduling information to the terminal in a Downlink Control Channel (PDCCH), configures Downlink Shared Channel (PDSCH) time-frequency resources occupied by transmission, modulation and coding modes, beam information, redundancy versions, hybrid automatic repeat process, and the like for Downlink data transmission, and performs Downlink data transmission in a mode indicated by the Downlink Control information on the PDSCH time-frequency resources indicated by the Downlink Control information.

When the user terminal has data to transmit to the base station, scheduling Request (SR) information may be sent in an Uplink Control Channel (PUCCH), and the SR triggers an Uplink transmission process to request the base station to perform Uplink transmission scheduling. After receiving the SR information, the base station sends Uplink scheduling grant (UL grant) information in the PDCCH Channel, and configures Uplink Shared Channel (PUSCH) time-frequency resources occupied by transmission, modulation and coding scheme, redundancy version, hybrid automatic repeat process, and the like for Uplink data transmission. And after receiving the UL grant information in the PDCCH, the terminal transmits uplink data in an indicated manner on the PUSCH time-frequency resource indicated by the UL grant information. Fig. 1 shows a process of triggering uplink transmission through SR.

As shown in fig. 1, in the SR-triggered uplink transmission process, after data arrives at a user terminal buffer, first, a PUCCH resource available to the user needs to be waited to send an SR, where a waiting time delay d1 is an uncertain value and is related to a PUCCH resource period available to the user. After receiving the SR, the base station side needs to transmit UL grant information to the terminal after a processing delay d 2. And after receiving the UL grant information, the terminal sends uplink data on the PUSCH resource after the processing delay d 3. In the process, the SR transmission occupation duration tau 1, the UL grant transmission occupation duration tau 2, and the PUSCH transmission occupation duration tau 3. In summary, the total transmission delay τ of data transmission over the air interface can be expressed by the following equation (1):

τ＝d1+τ1+d2+τ2+d3+τ3 (1)

in the LTE communication system, the minimum cycle of SR transmission is 1ms. The time slice of the uplink transmission in LTE is a subframe (1 ms), and the interval is also 1ms at minimum. The interval of the partial allocation downlink and uplink subframes may be 5ms to 9ms. The processing delay d2 is typically around 3ms. The processing delay d3 is 3ms to 6ms. The transmission delay of SR, UL grant, PUSCH is all 1ms. According to the formula (1), under different TDD (Time Division duplex) uplink and downlink configurations, even if a transmission configuration that reduces the delay as much as possible is adopted, the uplink air interface transmission delay of LTE is about 10ms at the minimum and about 23ms at the maximum.

In the 5G communication system, for example, FR1 and a subcarrier spacing of 30kHz are used, and when Mini-slots (minislots) are not used, the unit of resource scheduling is a slot (slot) having a length of 0.5ms. The minimum processing delay d1 is 0.5ms, the minimum processing delay d2 is about 1ms, and the minimum processing delay d3 is 0. The transmission delay of SR, UL grant and PUSCH are all 0.5ms. According to the formula (1), under the best condition, the uplink air interface transmission delay of the LTE is about 3ms at minimum.

In the prior art, the following method is generally adopted to reduce the air interface transmission delay:

1) Mini-slot (micro slot)

In order to reduce the air interface transmission delay, mini-slot is introduced into 4G and 5G systems. The Mini-slot realizes the faster conversion of uplink and downlink resources in time by reducing the time unit of uplink and downlink scheduling. In combination with the uplink transmission process described in fig. 1, when the uplink and downlink resource conversion interval becomes smaller, each processing delay and transmission delay are correspondingly reduced, so as to achieve the purpose of reducing the transmission delay of the air interface.

2) Semi-persistent scheduling

Semi-persistent (SPS) scheduling techniques have been introduced in 4G and 5G systems to reduce air-interface transmission delay. The technique semi-statically configures periodic transmission resources for the user terminal over a period of time through higher layer signaling and triggers in a semi-static or dynamic manner. And the user terminal receives downlink data on the configured periodic PDSCH time frequency resource or sends uplink data on the configured periodic PUSCH time frequency resource within the configured time range. For uplink transmission, because the base station configures time-frequency resources for the terminal, resource scheduling does not need to be applied through an SR, and UL grant information is also not needed, air interface delay caused by a signaling process is reduced.

The prior art has the following defects:

(1) The Mini-slot technique has the following problems in practical applications:

I. in order to avoid the interference of the downlink signal to the uplink signal, a guard time interval needs to be added to switch from the downlink time slice to the uplink time slice in the TDD system. Frequent switching of uplink and downlink time slices can cause a large amount of guard time intervals to be inserted, so that the utilization rate of system resources is reduced;

smaller uplink and downlink time slice switching time intervals provide greater challenges for the processing capacities of the base station and the terminal, and simultaneously increase the power consumption of the terminal and the base station equipment;

and III, in order to improve the uplink and downlink switching speed and inhibit the reduction of the system resource utilization rate as much as possible, the protection time interval needs to be configured to be as small as possible. However, the small guard interval may limit the coverage of the cell.

(2) Semi-persistent scheduling

The semi-persistent scheduling has the problem that the time delay and the utilization rate of system resources are difficult to balance. Unless the base station knows the service data throughput of the user terminal, the base station is difficult to configure a proper time-frequency resource period so as to meet the service delay requirement and not configure too many resources to influence the overall resource utilization rate of the system.

In summary, the process of the user terminal applying for the PUSCH resource through the SR brings an uplink and downlink signaling interaction process, resulting in a larger transmission delay. The base station side can reduce the transmission delay caused by the signaling process by configuring the predefined semi-continuous time frequency resource for the user terminal. However, for a user terminal with burst characteristics or non-uniform time domain distribution of data, the manner of configuring the time-frequency resources for the user terminal usually results in a decrease in the utilization rate of system resources and a low communication efficiency.

Based on the technical problems in the prior art, the present application provides a scheduling-free data transmission method for a wireless time division duplex system. The method enables the user terminals with small mutual interference to share the time frequency resources by grouping the user terminals, can reduce the transmission time delay caused by a signaling process, and keeps higher utilization rate of system resources while serving high time delay sensitive services.

On one hand, the method does not need to configure smaller uplink and downlink time slices, thereby avoiding the technical problems of reduced utilization rate of system resources caused by frequent switching of the uplink and downlink time slices, increased power consumption of the terminal and the base station equipment caused by smaller switching of the uplink and downlink time slices, limited coverage area of a cell caused by small configuration of a protection time interval and the like caused by the Mini-slot technology.

On the other hand, the method groups the user terminals, so that the user terminals with smaller mutual interference share the time-frequency resources. The user terminal group is composed of a plurality of related user terminals, so that compared with a single user terminal, the service data volume of the user terminal group is relatively stable, and the uneven data time domain distribution can be obviously weakened. The user terminals with delay sensitive service and low data burst are grouped, and the user terminal groups share time frequency resources, so that the technical problems of low utilization rate of system resources and low communication efficiency caused by semi-persistent scheduling in the prior art can be solved.

Fig. 2 is a schematic diagram of an embodiment of a scheduling-free data transmission method of a wireless time division duplex system according to the present application. The data transmission method can be applied to the base station side. As shown in fig. 2, the method may include:

step S110, dividing user terminal groups aiming at specific user terminals, wherein the specific user terminals are user terminals with specific time delay and specific data flow demand services;

step S120, configuring uplink time-frequency resources for scheduling-free uplink data transmission for the user terminal groups;

step S130, sending indication information to a specific user terminal in the user terminal grouping based on a semi-static signaling mode, wherein the indication information is used for indicating the specific user terminal in the user terminal grouping to transmit uplink data by using the uplink time-frequency resource.

In order to reduce data transmission delay, user terminal groups can be divided for user terminals with delay-sensitive services, so that the user terminals in the groups share time-frequency resources, uplink time-frequency resources for scheduling-free uplink data transmission are configured for the user terminal groups, and transmission delay caused by signaling processes such as scheduling requests and scheduling grants can be reduced. In addition, due to uncertainty of the bursty data traffic, appropriate resources are difficult to configure, grouping is performed for user terminals with services sensitive to time delay and low in data burst, uncertainty of the bursty data traffic can be avoided, and an appropriate time-frequency resource cycle can be better configured, so that the service time delay requirement can be met, and the overall resource utilization rate of the system cannot be influenced by configuration of too many resources.

In step S110, a specific ue with a specific delay and a specific data traffic demand service is divided into at least one ue group at the base station.

In step S120, uplink time-frequency resources for scheduling-free uplink data transmission are configured for the ue groups on the base station side. For example, an uplink PUSCH time-frequency resource for scheduling-free uplink data transmission in each uplink subframe, or each uplink timeslot, or each uplink minislot is defined.

In step S130, the base station side sends the indication information related to the uplink time-frequency resource configured in step S120 to each specific user terminal in the user terminal group. When the specific user terminal has data to be transmitted to the base station, the specific user terminal can transmit the uplink data by utilizing the uplink time-frequency resource which is configured at the base station side and used for scheduling-free uplink data transmission according to the indication information.

According to the embodiment of the application, the user terminals in the same group with smaller mutual interference share the time-frequency resource by grouping the user terminals, so that the transmission delay caused by a signaling process can be reduced. And the base station side can configure appropriate uplink time-frequency resources for the user terminal grouping according to the actual service requirement condition of each user terminal grouping, and maintain higher system resource utilization rate while serving the high-delay sensitive service.

In one embodiment, the specific user terminal further comprises at least one of:

a user terminal having a logical channel with a specific identification number;

In a possible implementation manner, the base station side may divide the user terminal groups by means of dynamic signaling or semi-static signaling for the user terminals with activated services having specific delay sensitivity and data traffic QoS requirements, or the user terminals with activated logical channels having specific identification numbers, or the user terminals with activated logical channel groups having specific identification numbers according to the mutual interference condition of uplink signals of the user terminals at the base station receiver.

In yet another possible implementation manner, a semi-static signaling manner may be utilized on the base station side to define, for each group of services with specific delay sensitivity and low data traffic QoS requirements, or a logical channel with a specific identifier, or a logical channel group with a specific identifier, an uplink PUSCH time-frequency resource for scheduling-free uplink data transmission in each uplink subframe, or each uplink timeslot, or each uplink minislot.

In one embodiment, the specific delay includes that the data delay is lower than a first set threshold; the specific data traffic requirement comprises that the maximum data burst amount is lower than a second set threshold.

In one example, the first set threshold is set to 50ms; the second set threshold is set to 128bytes. The traffic having the specific delay sensitivity and data traffic QoS requirements may include traffic having the following characteristics: the packet delay budget is below 50ms and the maximum data burst size is below 128bytes.

In the embodiment of the application, the user terminal groups are divided aiming at the user terminals with the delay sensitive service, so that the user terminals in the groups share the time-frequency resources, and the transmission delay can be effectively reduced. In addition, for a user terminal with a service with a high data burst, more resources need to be allocated to the user terminal to meet the transmission requirement of the data burst. However, allocating more resources for data with burst characteristics will result in high resource idle rate and reduced system resource utilization rate. Therefore, for the user terminal with the service with high data burst amount, the user terminal is not suitable to be divided into the user terminal groups sharing the time-frequency resource. In the embodiment of the application, the user terminals with delay sensitivity and low data burst are grouped, so that the transmission delay can be effectively reduced, and the higher utilization rate of system resources can be kept.

In one embodiment, the dividing the user terminal group for a specific user terminal includes:

At the base station side, at least one of an uplink sounding reference signal and an uplink demodulation reference signal can be used to measure the uplink channel characteristics from each specific user terminal to the base station. The uplink channel characteristics may include an uplink channel matrix or uplink channel vector, or an uplink channel autocorrelation matrix.

After the uplink channel characteristics are obtained through measurement, the uplink channel matrix or channel vector from each user terminal to the base station, or the characteristic vector of the uplink channel matrix, or the normalized correlation value between every two characteristic vectors of the uplink channel autocorrelation matrix, which are obtained through measurement, can be calculated at the base station side. In one example, the calculation method is as follows:

taking the uplink channel vector of the user a as an example:

H _a ＝[h _1，1，a ，h _2，1，a ，…，h _M，1，a ] ^T

wherein H _a Representing the uplink channel vector of the user a; h is a total of _m，1，a Representing the channel parameter from the 1 st antenna port of the user terminal a for channel measurement to the mth receiving radio frequency channel of the base station; t denotes the transpose of the matrix.

Taking the uplink channel vector of the user b as an example:

H _b ＝[h _1，1，b ，h _2，1，b ，…，h _M，1，b ] ^T

wherein H _b Representing the uplink channel vector of the user b; h is _m，1，b Representing the channel parameter from the 1 st antenna port of the user terminal b for channel measurement to the mth receiving radio frequency channel of the base station; t denotes the transpose of the matrix.

The normalized correlation value between user a and user b can be calculated using the following equation (2):

wherein, c _a，b Representing a normalized correlation value between user a and user b; h _a Representing the uplink channel vector of the user a; h _b Representing the uplink channel vector of the user b; t denotes the transpose of the matrix.

And (3) calculating a correlation value between any two specific user terminals according to the formula (2), and dividing the specific user terminals into at least one user terminal group according to the correlation. In general, the mutual interference between the user terminals with high correlation degree is small when the data is transmitted by the shared resource. Therefore, by grouping the user terminals, the user terminals with smaller mutual interference share the time-frequency resource, so that the transmission delay can be effectively reduced, and the communication efficiency can be improved.

In one embodiment, the dividing the specific ue into at least one ue group according to the correlation value comprises:

In the embodiment of the application, the specific user terminals are divided into a plurality of groups according to the calculated correlation value between any two specific user terminals. In one example, the grouping method comprises the steps of:

a. a user terminal group is set up as the current group. The smallest correlation value is found out of all the remaining correlations between the specific user terminals that have not been grouped. Dividing the two specific user terminals corresponding to the minimum correlation value into current groups;

b. setting a third set threshold to a specific value η. Selecting one user terminal which has the minimum sum of squares of correlation values with all the user terminals in the current group and has correlation values with all the user terminals in the current group not larger than a specific value eta from residual specific user terminals which are not selected into any group at present, and dividing the user terminal into the current group;

c. a fourth set threshold is set to a particular value N. The above process b is repeatedly performed until the number of the ues in the current packet reaches a specific value N, or until a specific ue meeting the condition in b cannot be selected from the remaining specific ues which do not select any packet. If the repeated execution process is terminated, the current grouping user terminal is selected to be ended, the step a is switched to be executed, the next user terminal grouping is set up again, the newly set grouping is used as a new current grouping, and the steps a to c are repeatedly executed. If there are no more remaining specific user terminals that have not selected any packets, the grouping process ends.

In one embodiment, the method further comprises:

After dividing user terminal groups for specific user terminals, a dynamic mode based on a downlink control channel or a semi-static mode based on high-level signaling can be used at a base station side to inform group identification numbers to all specific user terminals in each user terminal group. In one example, the packet identification number may be a 16-ary number corresponding to the packet sequence number.

In one embodiment, the indication information includes: taking time slots with set number as a set period, taking each uplink time slot in the set period as the uplink time-frequency resource, and indicating the allocation condition of the resource blocks of the uplink time-frequency resource in a bitmap or resource block sequence number mode; and/or the presence of a gas in the gas,

In the embodiment of the application, the indication information is sent to the specific user terminal in the group based on a semi-static signaling mode. In the indication information, the base station may indicate an identification number of a packet configured for a specific user terminal. Meanwhile, the base station may set a setting data K, for example, K may be an integer value such as 5, 10, 20, 40, etc. And taking K time slots as a period, sending a notice to all specific user terminals in each user terminal group, and informing each uplink time slot in the K time slots of the period of the resource blocks allocated for scheduling-free multiplexing transmission of the user terminals in the group.

In the resource block notification method, a bitmap (bitmap) mode may be adopted to indicate the allocation condition of each resource block in a bandwidth or a bandwidth part (BWP, bandwidth part). In addition, in the resource block notification method, the resource block allocation condition of the uplink time-frequency resource may also be indicated in a manner of notifying the starting or ending resource block numbers and the number of allocated resource blocks of consecutive resource blocks in the bandwidth or BWP.

In the indication information, the base station may further indicate a QCI (QoS class identity) parameter of a service having a specific delay sensitivity and a low data traffic QoS requirement for a specific user terminal. The QCI parameter is used to measure the packet forwarding behavior, such as packet loss rate and packet delay budget, of a particular service data flow. The QCI is applied to both GBR (guaranteed bit rate) and Non-GBR (Non-guaranteed bit rate) bearers, and is used to specify a control bearer level packet forwarding manner defined in the access node, such as scheduling weight, admission threshold, queue management threshold, link layer protocol configuration, and the like.

Alternatively, in the indication information, the base station may further indicate an ID (identity) of a logical channel with a specific identification number that the specific user terminal to be notified has, or an ID of a logical channel group with a specific identification number that the specific user terminal to be notified has.

In one embodiment, the indication information includes:

In the embodiment of the present application, the indication information sent by the base station side to the specific ue based on the semi-static signaling may further include a spreading sequence used by the base station to indicate transmission to all specific ues in each ue group. The spreading sequence may be a pseudo-random sequence such as a Gold sequence or a Chu sequence.

For example, the formula for spread spectrum transmission using a 31 long Gold sequence is as follows:

c(n)＝(x ₁ (n+N _c )+x ₂ (n+N _c ))mod2

x ₁ (n+31)＝(x ₁ (n+3)+x ₁ (n))mod2

x ₂ (n+31)＝(x ₂ (n+3)+x ₂ (n+2)+x ₂ (n+1)+x ₂ (n))mod2

wherein c and x represent spreading code sequences; n is a radical of _c ＝1600；x ₁ (n) initialization to x ₁ (0)＝1，x ₁ (n)＝0，n＝1，2，…，30；x ₂ (n) initialise to:

c in the above formula _init Can be used as a grouping identification number allocated by the base station for each user terminal grouping.

In the embodiment of the application, the spread spectrum technology is combined, so that the interference among the user terminals in the user terminal group can be further reduced.

In one embodiment, the method further comprises:

In the embodiment of the application, other services except the service with specific time delay sensitivity and data flow QoS requirements in the cell can be scheduled at the base station side, and the uplink transmission resources which are allocated by adopting the semi-static signaling mode can be multiplexed. Or, in the base station side scheduling cell, other logical channels except the logical channel with the specific identification number or other logical channel groups except the logical channel group with the specific identification number are multiplexed, and the uplink transmission resources which are allocated by the semi-static signaling mode are multiplexed. The uplink time-frequency resources are multiplexed by other user terminals except the specific user terminal, so that the delay sensitive service and the non-delay sensitive service share the resources, and the utilization rate of the system resources is further improved.

In the above embodiment, the base station side allocates uplink time-frequency resources for scheduling-free uplink data transmission to the user terminal in a semi-static signaling manner; and notifying all specific user terminals in each user terminal group of the group identification numbers based on a dynamic or semi-static manner; and the base station side indicates the QCI parameters of the service with specific time delay and specific data flow demand or the ID of the logical channel or the logical channel group with specific identification number for a specific user terminal. And the user terminal side receives the grouping identification number indicated by the base station, the time-frequency resource indication which is used for uplink scheduling-free transmission and corresponds to the grouping identification number, and QCI parameters or IDs of the logic channels or the logic channel groups, and transmits corresponding service data on the uplink time-frequency resource indicated by the base station according to the service data condition.

As shown in fig. 3, the present application further provides a corresponding embodiment of a scheduling-free data transmission apparatus of a wireless time division duplex system, and for beneficial effects or technical problems to be solved by the apparatus, reference may be made to descriptions in methods respectively corresponding to the apparatuses, or to descriptions in the summary of the invention, and details are not repeated here.

In an embodiment of the data transmission device, the device comprises:

a grouping unit 100 for: dividing user terminal groups aiming at a specific user terminal, wherein the specific user terminal is a user terminal with specific time delay and specific data flow demand service;

a configuration unit 200 for: uplink time-frequency resources used for scheduling-free uplink data transmission are configured for the user terminal groups;

an indication unit 300 for: and sending indication information to a specific user terminal in the user terminal grouping based on a semi-static signaling mode, wherein the indication information is used for indicating the specific user terminal in the user terminal grouping to transmit uplink data by utilizing the uplink time-frequency resource.

a user terminal having a logical channel with a specific identification number;

In one embodiment, the specific delay comprises a data delay below a first set threshold; the specific data traffic requirement comprises that the maximum data burst amount is lower than a second set threshold.

As shown in fig. 4, in one embodiment, the grouping unit 100 includes:

a measurement subunit 110 for: measuring uplink channel characteristics from each specific user terminal to the base station by using an uplink sounding reference signal and/or an uplink demodulation reference signal;

a computing subunit 120 for: calculating a correlation value between any two specific user terminals according to the uplink channel characteristics;

a molecular marking unit 130 for: and dividing the specific user terminal into at least one user terminal group according to the correlation value.

In one embodiment, the dividing subunit 130 is configured to:

In one embodiment, the indication unit 300 is further configured to:

In one embodiment, the indication information includes:

As shown in fig. 5, in an embodiment, the apparatus further includes a scheduling unit 400, where the scheduling unit 400 is configured to:

Fig. 6 is a schematic structural diagram of a computing device 900 provided in an embodiment of the present application. The computing device 900 includes: a processor 910, a memory 920, and a communication interface 930.

It is to be appreciated that the communication interface 930 in the computing device 900 shown in fig. 6 may be utilized to communicate with other devices.

The processor 910 may be connected to the memory 920. The memory 920 may be used to store the program codes and data. Accordingly, the memory 920 may be a storage unit inside the processor 910, an external storage unit independent of the processor 910, or a component including a storage unit inside the processor 910 and an external storage unit independent of the processor 910.

Optionally, computing device 900 may also include a bus. The memory 920 and the communication interface 930 may be connected to the processor 910 through a bus. The bus may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc.

It should be understood that, in the embodiment of the present application, the processor 910 may adopt a Central Processing Unit (CPU). The processor may also be other general purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. Or the processor 910 may employ one or more integrated circuits for executing related programs to implement the technical solutions provided in the embodiments of the present application.

The memory 920 may include a read-only memory and a random access memory, and provides instructions and data to the processor 910. A portion of the processor 910 may also include non-volatile random access memory. For example, the processor 910 may also store information of the device type.

When the computing device 900 is running, the processor 910 executes the computer-executable instructions in the memory 920 to perform the operational steps of the above-described method.

It should be understood that the computing device 900 according to the embodiment of the present application may correspond to a corresponding main body for executing the method according to the embodiments of the present application, and the above and other operations and/or functions of each module in the computing device 900 are respectively for implementing corresponding flows of each method of the embodiment, and are not described herein again for brevity.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. 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 application.

It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The present embodiments also provide a computer-readable storage medium, on which a computer program is stored, the program being used for executing a diversification problem generation method when executed by a processor, the method including at least one of the solutions described in the above embodiments.

The computer storage media of the embodiments of the present application may take any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Computer program code for carrying out operations for aspects of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C + +, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).

It is noted that the foregoing is only illustrative of the preferred embodiments of the present application and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention.

Claims

1. A scheduling-free data transmission method of a wireless time division duplex system is characterized by comprising the following steps:

and sending indication information to a specific user terminal in the user terminal group based on a semi-static signaling mode, wherein the indication information is used for indicating the specific user terminal in the user terminal group to transmit uplink data by utilizing the uplink time-frequency resource.

2. The method of claim 1, wherein the specific ue further comprises at least one of:

a user terminal having a logical channel with a specific identification number;

3. The method of claim 2, wherein the specific delay comprises a data delay below a first set threshold; the specific data traffic requirement comprises that the maximum data burst amount is lower than a second set threshold.

4. The method according to any of claims 1 to 3, wherein the dividing of user terminal groups for a particular user terminal comprises:

5. The method of claim 4, wherein the dividing the specific UE into at least one UE group according to the correlation value comprises:

in the case where the number of specific user terminals in the current group reaches a fourth set threshold or there is no specific user terminal satisfying a preset condition among the specific user terminals not yet grouped, the specific user terminals not yet grouped are classified into a newly set current group by performing the step of selecting a minimum correlation value from among correlation values among the specific user terminals not yet grouped.

6. The method according to any one of claims 1 to 3, further comprising:

7. The method according to any one of claims 2 or 3,

the indication information includes: taking a set number of time slots as a set period, taking each uplink time slot in the set period as the uplink time-frequency resource, and indicating the allocation condition of a resource block of the uplink time-frequency resource in a bitmap or resource block sequence number mode; and/or the presence of a gas in the gas,

8. The method according to any one of claims 1 to 3, wherein the indication information comprises:

9. The method according to any one of claims 1 to 3, further comprising:

10. A scheduling-free data transmission apparatus for a wireless time division duplex system, comprising:

a grouping unit for: dividing user terminal groups aiming at a specific user terminal, wherein the specific user terminal is a user terminal with specific time delay and specific data flow demand service;