CN113498167A - Method and system for transmitting small data packet by group broadcasting mode - Google Patents

Abstract

The invention provides a method and a system for transmitting small data packets by using a group broadcast mode, relates to a wireless communication system, and particularly relates to a method and a system for transmitting small data packets by using an LTE/NR physical downlink shared transmission channel. In the 4G era, the service mainly considered is the internet service, the large data volume service bearer is optimized, the support of small and miniature data packets is not considered too much, at least 1 PRB is used for transmission, and certain resource waste is caused. In the invention, the invention designs a data transmission scheme that the eNB collects small micro data packets to be transmitted as a whole, and the UE extracts the relevant part of the eNB after decoding, and tries to achieve the improvement of the resource utilization rate and the improvement of the transmission performance at the same time.

Description

Method and system for transmitting small data packet by group broadcasting mode

Technical Field

The invention relates to the field of communication, in particular to a method and a system for transmitting small data packets by utilizing an LTE/NR physical downlink shared transmission channel.

Background

The LTE (Long Term Evolution) project is the Evolution of 3G, improves and enhances the 3G over-the-air access technology, and is the most successful 4G standard system developed by the 3GPP standard organization. LTE adopts OFDM (Orthogonal Frequency Division Multiplexing) and MIMO (Multiple-Input Multiple-output) as the only standards for its wireless network evolution. LTE can provide peak rates of 100Mbit/s downlink and 50Mbit/s uplink under the frequency spectrum bandwidth of 20MHz, so that the performance of cell edge users is improved, the cell capacity is improved, and the system delay is reduced.

The 5G NR (New Radio) is a New generation standard system developed by 3GPP, the core Network adopts technologies such as NFV (Network function Virtualization) and SDN (Software Defined Network), and the access Network adopts technologies such as 100MHz basic bandwidth, large-scale antenna array and millimeter wave, so as to provide three types of basic service capabilities for New service types, and can reach Gbps-level enhanced mobile broadband, end-to-end 10ms transmission delay (access Network 1ms) URLLC (Ultra-reliable and low latency communication), and massive mtc massive internet of things (massive communication) for one million devices per square kilometer.

Since the 3GPP 4G/5G standard system is pulse-bearing, many technical contents are similar in principle, and for convenience, except for special description, the present invention is described using LTE terms, for example, the base station uses eNB, the terminal uses UE, and the evolution technology thereof is extended similarly, and the LTE system described in the present invention includes a subsequent evolution version of 3GPP, such as LTE-a/5G NR.

The downlink direction of LTE adopts Orthogonal Frequency Division Multiplexing (OFDM), wherein 1 radio frame of LTE includes 10 subframes (subframes) and 20 slots (slots), each downlink slot is divided into a plurality of OFDM symbols, and the number of included OFDM symbols is different according to the length of CP. When the normal CP is used, one downlink slot contains 7 OFDM symbols; when the extended CP is used, one downlink slot contains 6 OFDM symbols. In the time-frequency Resource Block, one Resource Element (RE) is a Resource defined by one symbol and one subcarrier, and one Resource Block (RB/PRB/physical Resource Block) is a time-frequency Resource occupied by 12 subcarriers and one downlink slot. The frame structure and the resource block definition included in LTE may vary according to different scenarios and configurations, and one possible example is described in fig. 1, and the method described in the present invention is applicable to various other possible configuration, and is not limited to the description of fig. 1.

Various physical channels defined by LTE to perform different functions are mapped onto a set of resource elements within a frame structure in a conventional manner.

The LTE function definitions mainly used in the present invention mainly include:

1) DCI (Downlink Control Information),

in the LTE system, in order to adapt to different transmission environments and requirements, a plurality of DCI formats are designed to configure a suitable transmission scheme for a corresponding UE, and transmission parameters selected for the UE, such as resource allocation, modulation/coding scheme selection, and the like of the UE, are explicitly or implicitly included in DCI information.

Under different transmission modes and bandwidths, DCI has different bit numbers, and table 1 lists partial information of DCI format 1A as an example, and complete information can be found in 3GPP TS 36.212:

TABLE 1

2) PDCCH (Physical Downlink control channel):

carried in the PDCCH is DCI, which contains resource allocation and other control information on one or more UEs. In LTE, uplink and downlink resource scheduling information such as MCS (Modulation and coding scheme) and resource allocation information are carried by PDCCH. In general, there may be a plurality of PDCCHs within one subframe.

In the LTE system, in order to configure PDCCH and other downlink Control channels effectively, two dedicated Control Channel resource units, resource Element groups (REGs, RE groups) and Control Channel Elements (CCEs) are defined; wherein, one REG consists of four adjacent 4 subcarriers in the frequency domain, one CCE consists of several REGs, one PDCCH consists of several CCEs, there are several different PDCCH format options mapped to CCE/REGs, and the parameters of PDCCH formats 0-3 are listed in table 2.

PDCCH format	Number of CCEs involved	Number of included REGs	Included PDCCH bits
				0	1	9	72
1	2	18	144
				2	4	36	288
3	8	72	576

TABLE 2

With the same DCI, different transmission reliabilities may be achieved by selecting different PDCCH formats, which are referred to as different aggregation levels.

The DCI transmission has a built-in RNTI-based CRC check code, which may be carried on different PDCCH candidates (PDCCH candidates have different CCE/REG positions or different aggregation degrees), a set of PDCCH candidates selected according to a predetermined rule of eNB and UE form a search space (search space), and a UE may be configured with a plurality of search spaces for different purposes. When the UE receives downlink data, it needs to perform DCI reception detection on all possible candidate PDCCHs in a predetermined search space, and no matter whether the candidate PDCCHs actually include DCI, if DCI meeting the CRC check rule is obtained, the PDSCH is further decoded according to the DCI information. This procedure for the terminal to detect DCI is called PDCCH blind detection.

3) PDSCH (Physical Downlink shared channel)

For carrying data of the UE, control information required for decoding thereof is carried by DCI. The PDSCH transmission also has CRC check rules built in to check whether the decoding is successful.

4) A PUCCH (Physical Uplink Control channel) is mainly used for transmitting UCI (Uplink Control Information) to support Uplink and downlink data transmission, and the main Control Information of the UCI includes:

an sr (scheduling request) for requesting an uplink channel resource to the eNB;

HARQ ACK/NACK, which confirms a downlink data decoding result transmitted on the PDSCH;

the csi (Channel State information) includes information such as CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (rank indication), and the like, and is used for informing the eNB of the Quality of a downlink Channel and the like to assist the eNB in downlink scheduling.

5) RNTI (Radio Network temporary Identity),

the RNTI is used to distinguish the purpose of information carried on the PDCCH,

a series of RNTI values are defined in the standard,

(1) SI-RNTI: a system message; (2) P-RNTI: paging; (3) RA-RNTI: marking a resource block used by a user for sending a random access preamble; (4) C-RNTI: a user service; (5) TPC-PUCCH-RNTI: PUCCH uplink power control information; (6) TPC-PUSCH-RNTI: PUSCH uplink power control information; (7) the usage of SPS C-RNTI is the same as C-RNTI, only when semi-persistent scheduling is used.

Allocation of RNTI values by the 3GPP system is described in Table 3, from section 3GPP TS36.3217.1

TABLE 3

An RNTI is well defined in the standard, all UEs need to monitor, for example, P-RNTI is FFFE, SI-RNTI is FFFF, when the two RNTI values are detected, the UE knows that the Information carried on the RNTI is signaling for paging or higher-layer SIB (System Information Block) signaling, and the other is dynamic allocation, for example, each UE is allocated a unique C-RNTI in the access process, (Cell Radio Network Temporary Identifier ) when the UE detects a matching RNTI value with itself, the UE knows that the Information on the RNTI belongs to itself.

Different functions can be formed by performing derivative calculation based on different RNTI values, for example, different UE scrambling code sequences can be generated, or different PDCCH positions can be positioned in a search space, and different data block functions can be effectively distinguished or UE data can be distinguished.

There are various transmission modes of lte (nr), however, the basic principle of the transmission process of downlink dynamic allocation resource remains unchanged, as shown in fig. 2,

step 201: the eNB puts DCI (Downlink Control Information) into a PDCCH channel,

step 202: the eNB puts the data of the UE into the PDSCH channel according to the information of the DCI,

the formed data is processed by a physical layer, sent by an air interface and received by the UE,

step 203: the UE obtains DCI information through PDCCH blind detection,

step 204: the UE decodes the corresponding PDSCH through the DCI information and checks it,

step 205: and the UE feeds back whether the PDSCH is successfully decoded or not through the PUCCH.

Step 206: the eNB detects the PUCCH to obtain an ACK/NACK signal which is used for determining whether the PDSCH transmission is successful or not and deciding whether to retransmit the current data or transmit new data.

In fig. 3, a downlink user data processing procedure with channel coding as a core is described,

the transmission data block is added with CRC check codes, then is divided into blocks suitable for being made into channel coding code length, is added with block CRC check codes, is subjected to channel coding and rate adaptation, and then is linked and sent to a physical layer to be sent by a PDSCH.

In fig. 4, a process of LTE PDSCH is described,

the UE data is composed of 1-2 code words, and the following processes are sequentially carried out:

1. bit level scrambling (scrambling code is Golden sequence with register length 31, initial state is related to identification number Cell _ id of Cell, C-RNTI and time slot number of user)

2. Modulation (using QPSK, 16QAM, 64QAM)

3. Layer mapping and precoding processing

a. Layer mapping: i.e. the data string of 1 or 2 transport blocks TB is transformed into M parallel data streams, where M is the number of layers. M must be equal to or less than the number of transmit antennas.

b. And carrying out corresponding precoding processing on the data of each layer. In LTE, all MIMO schemes can be represented as multiplication of one precoding matrix and the original signal, and different MIMO schemes have different precoding matrices.

4. Mapping of resource block (including sub-carrier mapping of data, and making same sub-carrier mapping to pilot signal, pilot and data satisfying time division relation)

IFFT transformation

And forming antenna port data and transmitting.

In the 4G era, because the service mainly considered is the internet service, the large data volume service bearer is optimized, the support of small micro data packets is not considered too much, and the data volume of the URLLC and mtc services facing the industrial control and the internet of things is filled in 1 PRB for transmission, which causes a certain waste of resources, and entering the 5G era, the data volume of the URLLC and mtc services facing the industrial control and the internet of things may be mainly small micro data packets, in the ITU-issued "Minimum requirements related to technical performance for IMT-2020 radio interface(s)", a typical URLLC test data packet length is 20bytes plus redundancy, a larger test data packet length is also only 100bytes, as indicated in the 3GPP conference documents R1-1910073 "enhanced on multimedia-TRP/multimedia transmission," a typical TB (Transport Block ) of the URLLC is usually very small, for example, 32bytes are more extensive for the internet of service types, mtc may support smaller data packets, such as industrial control commands. If a large number of small packets occur, the resource waste due to the limitation of the minimum scheduling resource may be more serious.

On the other hand, for common channel coding techniques, such as PDSCH channel coding technique TURBO used in 4G LTE and PDSCH channel coding technique LDPC (Low Density Parity Check Code) used in 5G NR, within a certain number of bits, the transmission performance will gradually increase as the length of the data packet increases ("bit error rate limit of finite length coding", proceedings of communications, 8 months 2001, vol. 22, No. 8).

In view of the above reasons, the present invention designs a data transmission scheme in which the eNB collects small mini-packets for transmission as a whole and the UE decodes the small mini-packets and extracts the relevant portions of the UE itself, so as to attempt to achieve both the improvement of the resource utilization and the improvement of the transmission performance.

Disclosure of Invention

The invention provides a method and a system for transmitting small data packets by using a group broadcast mode.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the invention discloses a method for transmitting small data packets by using a group broadcast mode, which comprises the following steps of:

step 501, an eNB collects small user data packets of a plurality of UEs according to a preset rule to form a large collected data packet;

the UE can find the data position in the aggregated data packet according to the preset rule, successfully decode and verify the successful reception, namely different UEs can obtain respective data from the transmission of one aggregated data packet;

step 502, the eNB uses a common preset RNTI to perform PDCCH transmission and PDSCH transmission on the converged data packet formed in step 501;

the eNB can configure a common RNTI (different from the RNTI of each UE) for a group of UEs, and the eNB completes normal PDCCH transmission and PDSCH transmission on the aggregated data packet by using the set common RNTI, which is equivalent to the process of completing data transmission by one UE; in the process, the group of UEs specified by the eNB all need to support the adopted transmission mode parameters, the eNB is equivalent to complete group broadcasting of the group of UEs, except for adopting a PDCCH of a common preset RNTI to perform PDSCH dynamic scheduling, a mode of configuring a common PDSCH transmission region and transmission parameters by a high layer can also be adopted to perform transmission of aggregated data packets, and is equivalent to transmission of a semi-statically configured PDSCH;

step 503, the UE performs PDCCH detection and PDSCH detection using the common preset RNTI;

the UE configured with the common RNTI performs corresponding PDCCH detection and PDSCH detection to obtain transmission data;

step 504, the UE extracts self-related data from the detected PDSCH data according to a predetermined rule;

when the real-time service which has higher requirement on real-time property and has no high requirement on the data transmission success rate is carried, the method can only use the 4 steps;

when a retransmission mechanism is needed to increase the success rate of data transmission, the retransmission may also be performed according to step 505/506/507,

step 505, if the UE successfully receives the signal, the ACK signal may be fed back on a predetermined PUCCH resource;

the UE in each group is configured with PUCCH resources for feedback, and if a plurality of UEs multiplex the same PUCCH resources, the UE cannot exist in the same summarized data packet to prevent resource conflict;

step 506, the eNB detects an ACK signal in a preset PUCCH resource;

if the eNB detects a successful ACK signal, step 507 is performed to complete the data transmission of the user,

otherwise, step 501 is required to be entered, and the user data is remitted into a new converged data packet for retransmission;

in order to distinguish a retransmission data packet from a new data packet, the UE data needs to add an index bit to index different data packets, which may be a loop counting manner, the simplest manner is 1-bit NDI (new data indication), the eNB needs to flip the NDI bit when transmitting a new data block, 0 becomes 1, 1 becomes 0, and the UE distinguishes whether the new data or the retransmission data is by comparing the received index bit with the index bit when the new data block is successfully received last time.

The present invention also discloses a system for transmitting small data packets by using a group broadcast method, as shown in fig. 6, the system comprises:

a terminal, a base station;

the base station includes:

a module 601, a UE data multiplexing and summarizing module, configured to summarize small data of multiple UEs into a summarized data packet according to a predetermined rule; when receiving an ACK signal of UE, the UE data transmission is successful, otherwise, the UE data needs to be multiplexed and summarized to a new summarized data packet for retransmission;

the UE can find the data position in the summarized data packet according to the preset rule, successfully decode and verify the successful reception.

A module 602, a PDCCH/PDSCH transmission module, configured to perform PDCCH/PDSCH transmission on the summarized data packet formed by the module 601 according to the configured group RNTI;

a module 603, a PUCCH detection module, which exists in a method using a retransmission function, receives a feedback signal on a designated PUCCH resource of each UE, and sends the feedback signal to the module 601,

if a plurality of UEs multiplex the same PUCCH resource, the same summarized data packet cannot exist;

the terminal includes:

a module 604, a PDCCH/PDSCH receiving module, for receiving the air interface signal of the module 602, and receiving the PDCCH/PDSCH according to the configured group RNTI; and sends the received data to block 605;

a module 605, a UE data demultiplexing extraction module, which extracts the UE data from the received data of the module 604 according to a predetermined rule, and if the UE data is successfully received, notifies the module 606 to send an ACK signal;

a module 606 and a PUCCH sending module, where when the module 605 successfully receives the UE data, the ACK signal is sent over an air interface and received by the module 603 of the eNB.

Drawings

Fig. 1 is a frame structure diagram of LTE;

fig. 2 is a diagram of LTE PDSCH transmission;

fig. 3 is a schematic diagram of an LTE channel coding process;

fig. 4 is a diagram of an LTE PDSCH transmission process;

FIG. 5 is a flow chart of the present invention for implementing group broadcasting by converging multiplexed small packets;

FIG. 6 is a system diagram of group broadcasting implemented by aggregation multiplexing small data packets according to the present invention;

figure 7 is an embodiment of a fixed-length multi-user data aggregation multiplexing transport of the present invention.

FIG. 8 is an embodiment of the present invention incorporating multi-user multiplexing of one small packet location;

FIG. 9 is an embodiment of a multi-user flexible multiplexing small packet locations formed by exploiting the PDCCH search space concept

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

FIG. 7 is a fixed-length multi-user data aggregation multiplexing transport embodiment of the present invention; as will be described in relation to figure 7,

assuming that N is 100 fixed-length 20-byte (including 18-byte data, 4-bit cycle count data packet sequence number and CRC check code generated by 12-bit UE C-RNTI), UE are sequentially arranged and multiplexed into a 2000-byte data packet, eNB configures a common independent RNTI M and a corresponding uplink subframe (such as a delayed 3-subframe) PUCCH feedback resource of each UE independent and the PDCCH/PDSCH transmission subframe for the UE, and informs each UE of the starting position of each data packet in advance;

the eNB generates a search space, a scrambling code, a CRC (cyclic redundancy check) code and the like for the converged data packet by using the RNTI M, and sends the search space, the scrambling code, the CRC code and the like according to the normal PDCCH/PDSCH steps;

each UE receives normal PDCCH/PDSCH by using the RNTI M, so that the received data packet is shared by multiple UEs, and feedback does not need to be generated for the whole data packet;

each UE extracts fixed-length 20-byte data according to a preset initial position, checks according to the C-RNTI of the UE, if the fixed-length 20-byte data pass the check, the data are regarded as successfully received, if the bit sequence number in the received data is increased by 1 compared with the bit sequence number successfully received last time (the initial state without transmission is regarded as increased by 1), data packets are sent to a high layer, ACK signals are fed back through PUCCH resources, and if the bit sequence number is unchanged, the ACK signals are directly fed back through the PUCCH resources (repeated packets are received);

after receiving the ACK signal of the UE, the eNB considers that the data of the UE is successfully received, may schedule the next data transmission of the UE, and increase the corresponding cycle bit count by 1, otherwise, schedule data retransmission, and maintain the cycle bit count unchanged, for example, if receiving ACK signals of other 99 UEs except UE1, it maintains the transmission data of UE1 (the count value is inconvenient), and combines with the new data (the count value is increased by 1) from UE2 to UE99 to form a new data packet for transmission.

It can be seen that 100 UE data transmissions originally requiring 100 independent PRB transmissions can now be performed using fewer PRB resources for overall transmission, saving resources for other purposes.

Since the service of the small data packet user is often highly random, if the UE at a fixed location does not generate a service requirement in the example shown in fig. 7, the resource waste is also caused, so that the concept of multiplexing the position of one small data packet by multiple users can be introduced, the resource utilization rate can be improved by using the average stability concept of a large number of statistical properties,

FIG. 8 is a diagram illustrating an embodiment of the present invention based on FIG. 7, wherein multiple users multiplex a small data packet; as illustrated in fig. 8, every K UEs may be allocated the same small packet resource location and the same PUCCH resource, e.g., UE 1/UE 1+ N/UE 1+ 2N/UE 1+ KN,

when the eNB forms an aggregated data packet, any UE in a group generates data, and may occupy a corresponding position of the group, for example, UE1+ N generates small packet data, and may occupy a small packet transmission position of UE1 in the example of fig. 7, and feeds back an ACK signal using a PUCCH resource of UE 1. Because the CRC generated by the C-RNTI of each UE is different, the UEs in the same group cannot pass false detection.

There are various ways for mapping the small data packets into the summarized data packets, for example, fig. 9 is an embodiment of flexibly multiplexing the positions of the small data packets by multiple users, which is formed by using the PDCCH search space concept for reference; as shown in figure 9 of the drawings,

the UE can have 3 different data length sizes, the total length is 20/40/80 bytes respectively, the last 2bytes of each length are CRC check codes generated by 4-bit cycle count data packet sequence numbers and 12-bit UE C-RNTI, a summarized data packet consists of 16 continuous search spaces, each search space has 80 bytes, 4 20-byte UE data (position 0/1/2/3) or 2 40-byte UE data (position 0/2) or 1 80-byte UE data (position 0) can be sequentially carried, the eNB can send the UE data at the possible positions of the corresponding search spaces according to the residual value modulo 16 by the UE C-RNTI value, the UE can perform trial detection on all possible UE data positions in the corresponding search spaces according to the residual value modulo 16 by the C-RNTI value to obtain the data packet passing through the C-RNTI CRC check codes of the UE, feeding back ACK at the position corresponding to the PUCCH resource, wherein the PUCCH resource and PDCCH/PDSCH transmission have a determined time delay relationship, the frequency domain initial position is defined by a high layer, and the frequency domain resource position corresponds to the initial position with the minimum data packet length in one summarized data packet every time 1 is increased;

as an example, an 80byte UE (C-RNTI ═ 16) transmits at position 0 in the search space, occupies position 0, and feeds back PUCCH resources corresponding to PUCCH resource starting position +0, a 20byte UE (C-RNTI ═ 65) transmits at position 0 in the search space, feeds back PUCCH resources corresponding to PUCCH resource starting position +4, a 20byte UE (C-RNTI ═ 129) transmits at position 1 in the search space, feeds back PUCCH resources corresponding to PUCCH resource starting position +5, a 40byte UE (C-RNTI ═ 241) transmits at position 2 in the search space, and feeds back PUCCH resources corresponding to PUCCH resource starting position + 6;

in a summarized data packet, the feedback position of the PUCCH is calculated based on the position of the minimum transmission data packet, so that the problem of feedback resource conflict cannot be caused, but the problem of resource conflict among different converged resource packets is avoided due to the configuration of the initial positions of the different converged resource packets;

the above description mainly uses PUCCH resources with explicit delay relationship with PDCCH/PDSCH for feedback, if the service requirement can tolerate larger delay, UE can also use higher layer data (such as MAC/RRC control signaling) mode to perform successful feedback of data reception, eNB can schedule data transmission (including retransmission) at correspondingly larger time interval;

the invention mainly uses the C-RNTI to distinguish the users in the aggregated data packet, does not lose generality, and can utilize other characteristic values with UE uniqueness to complete the same function.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (9)

1. A method for transmitting small packets using a group broadcast, comprising the steps of:

step 501, an eNB collects small user data packets of a plurality of UEs according to a preset rule to form a large collected data packet;

the UE can find the data position in the summarized data packet according to the preset rule, successfully decode and verify the successful reception;

step 502, the eNB uses a common preset RNTI to perform PDCCH transmission and PDSCH transmission on the converged data packet formed in step 501;

step 503, the UE performs PDCCH/PDSCH detection by using the public preset RNTI;

step 504, the UE extracts self data from the detected PDSCH data according to a preset rule;

if the feedback retransmission mechanism is supported, there can be steps 505 to 507;

step 505, if the UE successfully receives the signal, the ACK signal may be fed back on a predetermined PUCCH resource;

step 506, the eNB detects an ACK signal in a preset PUCCH resource;

if the eNB detects a successful ACK signal, step 507 is performed to complete the data transmission of the user, otherwise step 501 needs to be performed to perform data retransmission.

2. The method of claim 1, wherein data of multiple UEs are multiplexed into one aggregated data packet and transmitted in one PDSCH (group broadcast).

3. The method of claim 1, wherein the plurality of UEs, while having their respective RNTIs, also have a group common RNTI for detecting a group broadcast PDSCH.

4. The method of claim 1, wherein the small data packet of each UE may contain a bit cycle count of a data block number, and when the eNB receives the feedback ACK message, the eNB needs to increase a bit count (in a simplest manner, a 1-bit flip manner) for transmitting each new data packet, and the eNB schedules data retransmission, and the bit count of the retransmitted data packet is not changed.

5. The method of claim 1, wherein the small data packet for each UE comprises parity bits formed by UE-specific information.

6. The method of claim 1, wherein the ACK information is fed back through configured PUCCH resources after the UE extracts self data from the summarized data packet.

7. The method according to claim 1, wherein the time-frequency location of the PUCCH resource may be set with respect to the time-frequency location of the PDCCH transmitting user data, or may be a corresponding location setting of a fixed mapping, or may be a configurable setting that a higher layer signaling may change.

8. The method of claim 1, wherein for delay insensitive services, the terminal detects data sent to itself and can replace PUCCH feedback with higher layer signaling feedback.

9. A system for transmitting small packets using group broadcasting, the system comprising:

a terminal, a base station;

the base station includes:

a module 601, a UE data multiplexing and summarizing module, configured to summarize small data of multiple UEs into a summarized data packet system according to a predetermined rule, where the system includes:

a module 602, a PDCCH/PDSCH transmission module, configured to perform PDCCH/PDSCH transmission on the summarized data packet formed by the module 601 according to the configured group RNTI;

a module 603, a PUCCH detection module, which exists in a method of using a retransmission function, receives a feedback signal on a designated PUCCH resource of each UE, and sends the feedback signal to the module 601; if a plurality of UEs multiplex the same PUCCH resource, the same summarized data packet cannot exist;

the terminal includes:

a module 604, a PDCCH/PDSCH receiving module, for receiving the air interface signal of the module 602, and receiving the PDCCH/PDSCH according to the configured group RNTI; and sends the received data to block 605;

a module 605, a UE data demultiplexing extraction module, which extracts the UE data from the received data of the module 604 according to a predetermined rule, and if the UE data is successfully received, notifies the module 606 to send an ACK signal;

a module 606 and a PUCCH sending module, where when the module 605 successfully receives the UE data, the ACK signal is sent over an air interface and received by the module 603 of the eNB.

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