CN102833788B

CN102833788B - Uplink data sending method, device and system

Info

Publication number: CN102833788B
Application number: CN201210135618.XA
Authority: CN
Inventors: 韩玉楠; 李轶群; 李福昌; 郭省力; 杨剑键; 陈国利
Original assignee: China United Network Communications Group Co Ltd; China Information Technology Designing and Consulting Institute Co Ltd
Current assignee: China United Network Communications Group Co Ltd; China Information Technology Designing and Consulting Institute Co Ltd
Priority date: 2012-05-03
Filing date: 2012-05-03
Publication date: 2015-07-15
Anticipated expiration: 2032-05-03
Also published as: CN102833788A

Abstract

The invention discloses an uplink data sending method, an uplink data sending device and an uplink data sending system, wherein the uplink data sending method comprises the following steps: according to the request information sent by a limited mobile terminal limited by uplink transmission, sending back response message used for indicating the limited mobile terminal to perform uplink transmission to the limited mobile terminal, and sending assistance request to an assistance mobile terminal being in an idle state in a service area; after receiving confirmed assistance information returned by the assistance mobile terminal and the uplink data sent by the limited mobile terminal according to the response message, allocating the uplink data resource, indicating the limited mobile terminal to send data on the first resource, indicating the assistance mobile terminal to capture data on the first resource, and transmitting the data by utilizing a second resource; combining the data received from the first resource and the second resource after demodulation to acquire uplink data after signal strength reinforces. According to the uplink data sending method, the uplink data sending device and the uplink data sending system, the SINR (Signal-to-Interference and Noise Ratio) of receiving uplink data by a base station and the accuracy of demodulating the uplink data can be improved, and the effect of the base station uplink cover is strengthened.

Description

Uplink data sending method, device and system

Technical Field

The present invention relates to wireless communication technologies, and in particular, to an uplink data transmission method, apparatus, and system.

Background

With the development of wireless communication technology, the 3th Generation (3G) has become popular, and in response to the challenge of increasing high-speed data service demands, the mobile communication system needs to rapidly evolve to the next-Generation cellular mobile network, and gradually evolve to a Long Term Evolution (LTE) system.

Taking the LTE system as an example, a problem of uplink and downlink coverage imbalance commonly existing in various mobile communication systems will be described.

The LTE System is generally constructed based on an existing Global System for mobile communications (GSM) and/or Universal Mobile Telecommunications System (UMTS), and it is found through analysis and simulation comparison research on various radio channels in the LTE System that an uplink data traffic channel of LTE is the most severely covered channel.

Through simulation analysis and research, the coverage of the uplink data service is slightly influenced by the number of different allocated Resource Blocks (RBs) and other factors, and the main factor limiting the uplink coverage is the maximum power allocated to the uplink, that is, the maximum coverage distance of the uplink is most severely limited by the maximum transmission power of the uplink on the premise of meeting a certain data service rate.

Theoretically, the maximum transmission power of the terminal can be increased to improve uplink coverage, so as to achieve balanced coverage of uplink and downlink, data service and control signaling. However, increasing the power will greatly consume the energy consumption of the terminal, and due to the limiting factors such as the physical size of the terminal and the battery capacity, it is severely restricted to improve the coverage in a manner of increasing the maximum transmission power, and increasing the power will also cause great interference in the neighboring area, and accordingly, the coverage and capacity of the system will also be reduced. In the prior art, a Hybrid Automatic Repeat Request (HARQ) technology and an uplink frequency hopping technology are used, which may slightly improve coverage of uplink data services, but the effect is not significant.

Due to the limitation of energy consumption of the terminal, a problem that downlink transmission of a base station has a large coverage area, but the coverage area of uplink transmission of the base station is much smaller than that of downlink transmission, so that uplink and downlink coverage is unbalanced occurs in each mobile communication system, and the accuracy of uplink data demodulation of the base station is reduced due to the fact that a Signal to Interference plus Noise Ratio (SINR) of uplink data received by the base station is reduced.

Disclosure of Invention

Aiming at the defects in the prior art, the embodiment of the invention provides a method, a device and a system for sending uplink data.

The embodiment of the invention provides an uplink data sending method, which comprises the following steps:

according to received request information sent by a limited mobile terminal with limited uplink transmission, response information used for indicating the limited mobile terminal to carry out uplink transmission is returned to the limited mobile terminal, and an assistance request is sent to an assistance mobile terminal in an idle state in a service area;

after receiving the confirmation assistance information returned by the assistance mobile terminal according to the assistance request and the uplink data sent by the limited mobile terminal according to the response information, allocating uplink transmission resources, instructing the limited mobile terminal to send data on a first resource, instructing the assistance mobile terminal to capture data on the first resource and forwarding the data by using a second resource, wherein the first resource is orthogonal to the second resource;

and demodulating and combining the data received on the first resource and the second resource respectively to obtain the uplink data with enhanced signal strength.

The embodiment of the invention also provides an uplink data sending method, which comprises the following steps:

if the mobile terminal is judged to be a limited mobile terminal after detecting received reference signals periodically transmitted by base stations of a serving cell and an adjacent cell, transmitting request information for requesting assistance to the base station of the serving cell;

sending uplink data according to response information which is returned by the base station and indicates uplink transmission;

and sending uplink data according to the received indication information which is sent by the base station and indicates that the data is sent on the first resource.

returning confirmation assistance information according to the received assistance request sent by the base station;

and receiving and forwarding the data according to the received indication information which is sent by the base station and indicates to capture the data on the first resource and forward the data to the base station by using the second resource.

An embodiment of the present invention further provides a base station, including:

the first base station module is used for returning response information for indicating the limited mobile terminal to perform uplink transmission to the limited mobile terminal according to the received request information sent by the limited mobile terminal with limited uplink transmission, and sending an assistance request to an assistance mobile terminal in an idle state in a service area;

a second base station module, configured to allocate uplink transmission resources after receiving acknowledgement assistance information returned by the assisting mobile terminal according to the assistance request and uplink data sent by the limited mobile terminal according to the response information, instruct the limited mobile terminal to send data on a first resource, instruct the assisting mobile terminal to capture data on the first resource and forward the data by using a second resource, where the first resource is orthogonal to the second resource;

and the third base station module is used for demodulating and combining the data received on the first resource and the second resource respectively to obtain the uplink data with enhanced signal strength.

The embodiment of the invention also provides a limited mobile terminal, which comprises:

the first limited terminal module is used for detecting received reference signals periodically sent by base stations of a service cell and an adjacent cell, and sending request information for requesting assistance to the base station of the service cell after judging that the first limited terminal module is a limited mobile terminal;

the second limited terminal module is used for sending uplink data according to response information which is returned by the base station and indicates uplink transmission;

and the third limited terminal module is used for sending uplink data according to the received indication information which is sent by the base station and indicates that the data is sent on the first resource.

An embodiment of the present invention further provides an assistant mobile terminal, including:

the first assistance terminal module is used for returning the confirmation assistance information according to the received assistance request sent by the base station;

and the second assistant terminal module is used for receiving and forwarding the data according to the received indication information which is sent by the base station and indicates that the data is captured on the first resource and is forwarded to the base station by using the second resource.

The embodiment of the invention also provides a communication system which comprises the base station, the limited mobile terminal and the assistant mobile terminal.

In the embodiment of the invention, after receiving a request sent by a limited mobile terminal, a base station searches a mobile terminal capable of providing assistance in a service area of the base station as an assistance mobile terminal, and when the limited mobile terminal sends uplink data of the limited mobile terminal, the assistance mobile terminal actively acquires the data sent by the limited mobile terminal according to the indication of the base station and forwards the acquired data to the base station, so that the base station not only can receive the uplink data sent by the limited mobile terminal, but also can receive the uplink data forwarded by the assistance mobile terminal. Therefore, the signal strength of the uplink data sent by the limited mobile terminal received by the base station is enhanced, the SINR of the uplink data received by the base station can be improved, the accuracy of the uplink data demodulation of the base station is improved, the uplink communication quality of the limited mobile terminal is improved, the uplink coverage effect can be effectively enhanced, and the balance of uplink and downlink coverage ranges is facilitated.

Drawings

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

fig. 2 is a flowchart illustrating a second uplink data transmission method according to an embodiment of the present invention;

fig. 3 is a flowchart of another embodiment of a second uplink data transmission method according to the present invention;

fig. 4 is a flowchart illustrating a third uplink data transmission method according to an embodiment of the present invention;

fig. 5 is a flowchart of a third uplink data transmission method according to another embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a limited mobile terminal embodiment of the present invention;

FIG. 8 is a block diagram of an embodiment of an assisting mobile terminal according to the present invention;

fig. 9 is a schematic structural diagram of a communication system according to the present invention.

Detailed Description

Fig. 1 is a flowchart of a first embodiment of an uplink data transmission method according to the present invention, and as shown in fig. 1, the method includes:

step 100, according to the received request information sent by the limited mobile terminal with limited uplink transmission, returning response information for indicating the limited mobile terminal to perform uplink transmission to the limited mobile terminal, and sending an assistance request to an assistance mobile terminal in an idle state in a service area;

the base station and the mobile terminal in the service area carry out normal data communication, because of the limitation of the performance of the mobile terminal equipment and the consideration of the interference of the adjacent area and other problems, the uplink transmitting power of the base station can be limited within a certain range, so that the uplink coverage range of the base station is smaller than the downlink coverage range, and for the mobile terminal, when the mobile terminal moves to an area with the downlink coverage range larger than the uplink coverage range, the uplink transmission is limited, and the mobile terminal becomes a limited mobile terminal. For a restricted mobile terminal with limited uplink transmission, the SINR of the uplink data transmitted by the base station received by the base station may decrease, and the accuracy of the uplink data demodulated by the base station may decrease.

In the embodiment of the invention, the mobile terminal needs to send uplink data to the base station, and when the uplink transmission is limited, the base station is requested to provide assistance for the uplink transmission in a mode of sending request information to the base station. Specifically, when the mobile terminal needs to send uplink data to the base station, it needs to send random access preamble data to the base station first to Request access, so the Request information may be in the form of random access preamble data (preamble) sent by the limited mobile terminal to the base station, which is different from the prior art in that an assistance transmission Request (ATR-NB) signaling requesting assistance of the base station is added in the preamble data. However, the form of the request message is not limited to this, and the request message may be in a form including only ATR-NB signaling, and the random access preamble data may be transmitted to the base station in a normal signaling form.

Although the uplink transmission of the restricted mobile terminal is restricted, when the base station demodulates data of the non-essential communication content such as the preamble data and the request information, the amount of information of the data is small, the requirement on the transmission rate is low, and the demodulation level itself to be used is low, so that the base station can correctly receive and demodulate the request initiated by the restricted mobile terminal even if the uplink transmission is restricted. For the substantial communication content sent by the mobile terminal in the uplink data, the information amount of the part of data is large, and certain requirements are imposed on the transmission rate, and correspondingly, the base station needs to adopt a higher demodulation level to ensure the data transmission rate; however, when the mobile terminal moves to an area with limited uplink coverage, i.e. becomes a limited mobile terminal, the SINR of the uplink data transmitted by the base station is reduced, and the base station needs to reduce its demodulation level in order to demodulate the uplink data normally. When the base station reduces its demodulation level, it will affect the data transmission rate between the base station and the mobile terminal, and at the same time, it cannot be guaranteed that the uplink data can be demodulated correctly.

And after receiving the request information sent by the limited mobile terminal, the base station returns response information to the limited mobile terminal so as to indicate the limited mobile terminal to start uplink transmission. Specifically, the response information may be a random access response message returned by the base station to the mobile terminal, that is, a form of a response message for the received random access preamble data sent by the mobile terminal, which is different from the prior art that an assisted transmission request acknowledgement signaling for responding to the ATR-NB is added in the random access response message; the response information also carries information necessary for normal communication, such as a sequence Identity identification number (ID), a time advance, resource allocation information, and the like, so that the limited mobile terminal performs uplink transmission according to the information. And correspondingly, after receiving the response information, the limited mobile terminal sends uplink data according to the instruction of the base station.

And the base station returns response information to the limited mobile terminal, and simultaneously searches for a mobile terminal capable of providing assistance for the limited mobile terminal in the service area of the base station as an assistance mobile terminal. The current service state of the mobile terminal needs to be an idle state, namely, the communication service is not executed; different from the common mobile terminal in the prior art, the assisting mobile terminal needs to be able to capture data on the resource designated by the base station, that is, the assisting mobile terminal not only has normal communication capability, and is able to perform transceiving of communication data with the base station, but also can actively acquire uplink data sent by other mobile terminals on the designated resource according to the instruction of the base station.

If the communication system operates in a Time Division Duplex (TDD) mode, the mobile terminal receives and transmits data in different uplink and downlink timeslots, so that the assisting mobile terminal with the above capability can capture data in the timeslot designated by the base station accordingly.

If the communication system operates in a Frequency Division Duplex (FDD) mode, the mobile terminal transmits and receives data on different uplink and downlink communication frequencies, and therefore, the assisting mobile terminal having the above-described capability can transmit and receive data not only on the uplink communication Frequency, but also on the downlink communication Frequency. That is, the assisting mobile terminals having the above-described capability can not only forward data received from the base station to other mobile terminals using the downlink communication frequency, but also receive uplink data transmitted from other mobile terminals and forward the uplink data to the base station using the uplink communication frequency, and the mobile terminals can directly communicate with each other.

However, in order to reduce the load of the base station in receiving the communication signaling, the mobile terminal having the capability of capturing data on the resources specified by the base station does not report its state information having this capability to the base station. Therefore, after searching the mobile terminal in the idle state in the service area of the base station, the base station sends an assistance request to the searched mobile terminal to request the base station to provide assistance for the limited mobile terminal with limited uplink transmission. The number of the eligible assisting mobile terminals can be one or more.

Step 101, after receiving acknowledgement assistance information returned by the assistance mobile terminal according to the assistance request and uplink data sent by the limited mobile terminal according to the response information, allocating uplink transmission resources, instructing the limited mobile terminal to send data on a first resource, instructing the assistance mobile terminal to capture data on the first resource and forwarding the data by using a second resource, wherein the first resource is orthogonal to the second resource.

After receiving an assistance request sent by a base station, if the mobile terminal in an idle state is a common mobile terminal, that is, the mobile terminal does not have the capability of acquiring data on a resource designated by the base station, the mobile terminal can not feed back to the base station after receiving the assistance request; only the mobile terminal with the capability can return the confirmation assistance information to the base station after receiving the assistance request, and can receive the request of the base station to become the assistance mobile terminal.

And the assistant mobile terminal returns the confirmation assistant information to the base station after receiving the assistant request sent by the base station. And after receiving the response information sent by the base station, the limited mobile terminal sends uplink data according to the indication of the base station.

It should be noted that although the limited mobile terminal has limited uplink transmission, uplink data of the limited mobile terminal still needs to be transmitted after receiving the response information, and information contained in the uplink data is the same as that in the prior art. The reason for performing this operation step is that the uplink data sent by the mobile terminal to the base station at this time is used as a starting condition for the base station to allocate resources to the restricted mobile terminal and the assisting mobile terminal, that is, the base station receives the acknowledgement and assistance information returned by the assisting mobile terminal, and after receiving the uplink data sent by the restricted mobile terminal, allocates respective communication resources to the restricted mobile terminal and performs subsequent operations. Moreover, the same as in the prior art, the uplink data sent by the mobile terminal carries the current state information of the mobile terminal, so that the base station can timely know the working state of the mobile terminal.

The uplink data sent by the restricted mobile terminal before the base station allocates the first resource to the restricted mobile terminal may be the same as or different from the uplink data sent by the restricted mobile terminal on the first resource according to the instruction of the base station.

After receiving the acknowledgement assistance information returned by the assistance mobile terminal and the uplink data returned by the limited mobile terminal, the base station allocates resources again, allocates first resources required for the limited mobile terminal to perform uplink transmission for the limited mobile terminal, and allocates second resources required for the assistance mobile terminal to perform uplink transmission for the limited mobile terminal, wherein the first resources and the second resources are orthogonal, namely, the first resources and the second resources are not interfered with each other; after the resources are distributed, a communication instruction is sent to the limited mobile terminal to instruct the limited mobile terminal to send uplink data of the limited mobile terminal by using the first resources, the communication instruction is sent to the assistant mobile terminal to instruct the assistant mobile terminal to actively acquire data of the first resources, and the acquired data are forwarded to the base station by using the second resources.

Specifically, taking LTE system as an example, the resource allocated to the mobile terminal by the base station is one or more continuous RBs, and the one or more RBs allocated to the restricted mobile terminal have orthogonality in the time domain with the one or more RBs allocated to the assisting mobile terminal. When the embodiment of the invention is applied to other communication systems, the communication transmission resources allocated to the limited mobile terminal and the assistant mobile terminal also need to be mutually orthogonal so as to ensure that the communication transmission resources do not interfere with each other in the data receiving and transmitting process.

It is to be understood that the first resource and the second resource are only names of resources allocated to different mobile terminals, and are not related to the sequence.

And 102, demodulating and combining the data received from the first resource and the second resource respectively to obtain the uplink data with enhanced signal strength.

The base station instructs the restricted mobile terminal to transmit data on the first resource; and meanwhile, the indication assists the mobile terminal to actively acquire the data on the first resource, and after the data is forwarded to the base station on the second resource, the uplink data sent by the mobile terminal is received. And demodulating the data received on the first resource and the second resource respectively, and combining the data after being demodulated respectively so as to obtain final uplink data.

The uplink data sent by the limited mobile terminal not only reaches the base station through a space channel corresponding to a propagation path between the limited mobile terminal and the base station; the assisting mobile terminal is reached through a spatial channel corresponding to a propagation path between the assisting mobile terminal and the base station, and the assisting mobile terminal is reached through a spatial channel corresponding to a propagation path between the assisting mobile terminal and the base station. Therefore, the uplink data on the first resource and the second resource received by the base station are two paths of uplink data, and after the two paths of data signals are combined, the signal strength is enhanced compared with that of a single path of data signal.

According to the uplink data transmission method provided by the embodiment of the invention, after receiving the request sent by the limited mobile terminal, the base station searches the mobile terminal capable of providing assistance in the service area of the base station as the assistance mobile terminal, and when the limited mobile terminal sends uplink data of the limited mobile terminal, the assistance mobile terminal actively acquires the data sent by the limited mobile terminal according to the indication of the base station and forwards the acquired data to the base station, so that the base station not only can receive the uplink data sent by the limited mobile terminal, but also can receive the uplink data forwarded by the assistance mobile terminal. Therefore, the signal strength of the uplink data sent by the limited mobile terminal received by the base station is enhanced, that is, the method in the embodiment of the present invention can improve the SINR of the base station for receiving the uplink data, improve the accuracy of the base station for demodulating the uplink data, help to improve the uplink communication quality of the limited mobile terminal, and effectively enhance the uplink coverage effect, thereby facilitating the balance of the uplink and downlink coverage.

Further, on the basis of the above embodiment, the limited mobile terminal is a mobile terminal in which, within the trigger time, the Reference Signal Receiving Power (RSRP) of the neighboring cell is greater than the maximum value of the preset offset range of the RSRP of the serving cell, or the Reference Signal Receiving Quality (RSRQ) of the neighboring cell is greater than the maximum value of the preset offset range of the RSRQ of the serving cell.

Specifically, the assistance for uplink transmission is performed for a limited mobile terminal in the service area of the base station, and therefore it is necessary to determine whether the mobile terminal belongs to the limited mobile terminal, that is, whether uplink transmission is limited.

Each base station sends a reference signal to a mobile terminal in a service area of the base station periodically, the mobile terminal detects RSRP or RSRQ of a current service area and an adjacent area after receiving the reference signal, if the value of the RSRP or the RSRQ of the adjacent area meets an entering condition, the mobile terminal is judged to be a limited mobile terminal, if the value of the RSRP or the RSRQ of the adjacent area does not meet the entering condition, the mobile terminal does not belong to the limited mobile terminal, and the base station is communicated with the mobile terminal according to a normal communication flow.

The following describes the conditions for the determination using RSRP as an example.

Setting Ms as the value of RSRP of a service cell received by the mobile terminal; mn is the numerical value of RSRP of the adjacent cell received by the mobile terminal; off is a set threshold value, which is determined by network measurement, by setting off, Mn is not directly compared with the value of Ms, but is compared with the value of Ms + off, off is an adjustment value, so that Ms is reasonably reduced to a value range suitable for comparison with Mn; hys is the offset of the off threshold within a certain range. Thus, a predetermined offset range is formed, i.e., the offset range has a maximum value of Ms + off + hys and a minimum value of Ms + off-hys.

If the Mn of the mobile terminal is greater than Ms + off + hys in the triggering time, the entry condition is met, and the mobile terminal is judged to be a limited mobile terminal. The starting time point of the trigger time is the time when the mobile terminal receives the reference signal periodically sent by the base station, and the ending time after the time length preset by the continuous system is the ending time point of the trigger time.

Since the RSRQ and the RSRP have a mathematical operation relationship, the same principle applies when the determination is performed based on the RSRQ.

According to the uplink data transmission method provided by the embodiment of the invention, the reference signal periodically transmitted to the mobile terminal by the base station is used as a judgment basis, and the mobile terminal judges whether the mobile terminal meets the entry condition or not according to the received signal strength of the reference signals of the current service cell and the adjacent cell, namely whether the mobile terminal is a limited mobile terminal with the uplink coverage limited condition or not. If the mobile terminal judges that the mobile terminal is the limited mobile terminal currently, when the mobile terminal needs to transmit uplink data, the mobile terminal requests the base station to assist the uplink data transmission so as to improve the signal intensity of the uplink data received by the base station. The method provided by the embodiment of the invention can be used for actively initiating the request by the mobile terminal needing to be assisted in a targeted manner, so that the communication quality of the mobile terminal is enhanced under the assistance of the base station and the assisting mobile terminal, the SINR of the uplink data received by the base station can be effectively improved, the accuracy of the base station demodulating the uplink data is improved, the effect of the uplink coverage of the base station is enhanced, and the balance of the uplink and downlink coverage of the base station is facilitated.

Further, on the basis of the foregoing embodiments, in the next trigger time, if the RSRP of the neighboring cell is smaller than the minimum value of the preset offset range of the RSRP of the serving cell, or the RSRQ of the neighboring cell is smaller than the minimum value of the preset offset range of the RSRQ of the serving cell, the limited mobile terminal switches to the state of the non-limited mobile terminal.

Specifically, if the limited mobile terminal detects that the RSRP or RSRQ value of its neighboring cell meets the departure condition within the next trigger time, it is determined that the limited mobile terminal becomes an unrestricted mobile terminal, and can communicate with the base station according to a normal communication flow; and if the leaving condition is not met, the communication is still carried out with the base station according to the communication flow of the limited mobile terminal.

The departure condition will be described in detail by taking the RSRP determination as an example.

And if the Mn of the limited mobile terminal is less than Ms + off-hys in the trigger time, the departure condition is met, and the limited mobile terminal is judged to be the non-limited mobile terminal. The unrestricted mobile terminal will become the restricted mobile terminal again when it again satisfies the entry condition.

After the mobile terminal is started, when the RSRP or the RSRQ of a serving cell and an adjacent cell of the mobile terminal is detected for the first time, if the access condition is met, the mobile terminal is a limited mobile terminal, and if the access condition is not met, the mobile terminal does not belong to the limited mobile terminal; and under the condition except the first detection, if the detection result does not meet the entering condition or the leaving condition, maintaining the state judged in the last trigger time unchanged.

When determining whether the mobile terminal is a limited mobile terminal, the uplink data transmission method provided in the embodiment of the present invention sets an entry condition and a departure condition, that is, a maximum value and a minimum value of a preset value range are used as determination conditions. The restricted mobile terminal which has satisfied the entry condition is not determined as the non-restricted mobile terminal immediately because the entry condition is not satisfied within the next trigger time, but is determined as the non-restricted mobile terminal only when the exit condition needs to be satisfied. Therefore, when the mobile terminal is located in a critical area with limited uplink coverage, the method in the embodiment of the invention can avoid the problem that the mobile terminal is likely to switch too frequently between a limited state and a non-limited state.

Further, on the basis of the foregoing embodiments, the assisting mobile terminal is an unrestricted mobile terminal.

Specifically, when the base station searches for an assisting mobile terminal capable of providing assistance for the limited mobile terminal in the service area of the base station, the assisting mobile terminal needs to be in an idle state, and can capture data on a resource designated by the base station, and also needs to be an unlimited mobile terminal, that is, the mobile terminal does not meet an entry condition within a first trigger time; the mobile terminal that has satisfied the leaving condition, i.e., the non-restricted mobile terminal, does not satisfy the entering condition within the last trigger time, or the mobile terminal that has satisfied the entering condition, i.e., the restricted mobile terminal, satisfies the leaving condition within the last trigger time.

When the base station selects the assisting mobile terminal in the service area of the base station, the uplink data transmission method provided by the embodiment of the invention can enable the assisting mobile terminal to meet the requirements that the assisting mobile terminal is in an idle state at present and has the capability of capturing data on the resource designated by the base station, and also needs to meet the condition that the assisting mobile terminal does not belong to a limited mobile terminal. The mobile terminal without uplink transmission limitation is selected to provide assistance for the limited mobile terminal, so that the SINR of the base station for receiving the uplink data sent by the limited mobile terminal can be effectively improved, the accuracy of the base station for demodulating the uplink data is improved, the uplink communication effect of the limited mobile terminal is effectively improved, the uplink coverage effect of the base station is enhanced, and the balance of uplink and downlink coverage ranges is facilitated.

Further, on the basis of the foregoing embodiments, the assisting mobile terminal is located within a preset range between the restricted mobile terminal and the base station.

Specifically, when the base station searches for the assisting mobile terminal capable of providing assistance for the restricted mobile terminal in the service area of the base station, the assisting mobile terminal is also required to be located between the base station and the position of the restricted mobile terminal requesting assistance, and according to the system setting, the assisting mobile terminal can be located within a certain preset range between the base station and the position of the restricted mobile terminal.

The base station may obtain the location information of each mobile terminal in the service area through a Global Positioning System (GPS) or according to information reported by the mobile terminal when the mobile terminal performs normal communication with the base station.

According to the uplink data transmission method provided by the embodiment of the invention, when the base station selects the assistant mobile terminal in the service area of the base station, the assistant mobile terminal is required to be in an idle state, has the capability of capturing data on the resource designated by the base station, does not belong to the limited mobile terminal, and is required to be positioned between the base station and the limited mobile terminal. The selection of the assisting mobile terminal can make the attenuation of the signal in the propagation path as small as possible when the assisting mobile terminal receives and forwards the data, that is, because the distance between the assisting mobile terminal and the base station and the limited mobile terminal is limited within a certain range, the signal strength of the data forwarded to the base station by the assisting mobile terminal can be ensured as much as possible, and the signal strength of the data sent by the assisting mobile terminal and received by the base station can be ensured as much as possible, so that the uplink communication effect of the limited mobile terminal is improved, the SINR of the base station for receiving uplink data is improved, the accuracy of the base station for demodulating uplink data is improved, the uplink coverage effect of the base station is improved, and the balance of the uplink coverage range and the downlink coverage range of.

Fig. 2 is a flowchart of a second embodiment of an uplink data transmission method according to the present invention, as shown in fig. 2, the method includes:

step 200, if the reference signals received and periodically sent by the base stations of the serving cell and the adjacent cell are detected, and the mobile terminal is judged to be a limited mobile terminal, sending request information for requesting assistance to the base station of the serving cell.

Each base station periodically sends a reference signal to a mobile terminal in a service area of the base station, the mobile terminal compares the received signal strength of the reference signal sent by the base station of the current service cell with the signal strength of the reference signal sent by the base station of the adjacent cell, judges whether the mobile terminal is limited when the mobile terminal carries out uplink data transmission with the base station of the current service cell, if so, judges that the current state of the mobile terminal is a limited mobile terminal, and needs to request the base station to assist the uplink transmission.

When the mobile terminal needs to send uplink data to the base station but uplink transmission is limited, the base station is requested to provide assistance for the uplink transmission in a mode of sending request information to the base station. Specifically, when the mobile terminal needs to send uplink data to the base station, it needs to send random access preamble data to the base station first to request access, so the request information may be in the form of random access preamble data sent by the limited mobile terminal to the base station, which is different from the prior art in that ATR-NB signaling is added in the preamble data. However, the form of the request message is not limited to this, and the request message may be in a form including only ATR-NB signaling, and the random access preamble data may be transmitted to the base station in a normal signaling form.

Step 201, sending uplink data according to the response information which is returned by the base station and indicates to carry out uplink transmission.

And after receiving the request information sent by the limited mobile terminal, the base station correspondingly returns response information to indicate the limited mobile terminal to start uplink transmission. Specifically, the response information may be a random access response message returned by the base station to the mobile terminal, and the difference from the prior art is that an assistance transmission request acknowledgement signaling responding to the ATR-NB is added to the random access response message; the response information also carries information necessary for normal communication, such as sequence ID, time advance, resource allocation information, etc., so that the limited mobile terminal can perform uplink transmission according to the information. And after receiving the response information, the limited mobile terminal sends uplink data according to the indication of the base station.

After receiving the request information sent by the limited mobile terminal, the base station returns response information to the limited mobile terminal, and simultaneously searches for an assisting mobile terminal capable of providing assistance in the service area of the base station, and sends an assistance request to the searched assisting mobile terminal.

Step 202, sending uplink data according to the received indication information sent by the base station and indicating that data is sent on the first resource.

And the limited mobile terminal sends uplink data to the base station according to the response information sent by the base station. The base station receives uplink data returned by the limited mobile terminal according to the response information and receives confirmation assistance information returned by the assistance mobile terminal according to the assistance request, and then the base station allocates the first resource for the limited mobile terminal to perform uplink transmission, and then sends indication information to the limited mobile terminal to indicate the limited mobile terminal to send data on the first resource, and correspondingly, the limited mobile terminal sends uplink data according to the indication of the base station.

It should be noted that, when the restricted mobile terminal executes step 201 and step 202, the uplink data transmitted by the restricted mobile terminal may be the same or different.

According to the uplink data sending method provided by the embodiment of the invention, when the mobile terminal judges that the mobile terminal has the uplink transmission limitation condition and needs to perform uplink transmission, the mobile terminal actively initiates a request to the base station to request the base station for assistance based on the uplink transmission, and sends the uplink data on the allocated resources according to the indication of the base station. By adopting the method provided by the embodiment of the invention, only the limited mobile terminal is assisted, the influence on other mobile terminals in the communication system is small, the limited mobile terminal correspondingly sends uplink data according to the indication sent by the base station, the assisting operation is finished by the base station and the assisting mobile terminal, the higher requirement on the configuration of the limited mobile terminal is not met, and the influence on the performance of the limited mobile terminal is not caused. On the premise of not influencing the communication of the limited mobile terminal, the base station is matched with the assistant mobile terminal, so that the SINR of the received limited mobile uplink data can be effectively improved on the base station side, the accuracy of the base station for demodulating the uplink data is improved, the uplink coverage effect of the base station is effectively improved, and the balance of the uplink coverage range and the downlink coverage range of the base station is facilitated.

Further, on the basis of each of the above embodiments, the limited mobile terminal is a mobile terminal whose RSRP of the neighboring cell is greater than the maximum value of the preset offset range of the RSRP of the serving cell, or whose RSRQ of the neighboring cell is greater than the maximum value of the preset offset range of the RSRQ of the serving cell, within the trigger time.

After receiving the reference signals sent by the base stations of the serving cell and the adjacent cells, the mobile terminal detects the received RSRP or RSRQ of the reference signals sent by the base station of the serving cell and the RSRP or RSRQ of the reference signals sent by the base stations of the adjacent cells. If the value of the RSRP or the RSRQ of the adjacent cell meets the entry condition, the mobile terminal is judged to be a limited mobile terminal, if the value of the RSRP or the RSRQ of the adjacent cell does not meet the entry condition, the mobile terminal does not belong to the limited mobile terminal, and the mobile terminal communicates with the base station according to a normal communication flow.

According to the uplink data transmission method provided by the embodiment of the invention, the reference signal periodically transmitted to the mobile terminal by the base station is used as a judgment basis, and the mobile terminal judges whether the mobile terminal meets the entry condition or not according to the received signal strength of the reference signals of the current service cell and the adjacent cell, namely whether the mobile terminal is a limited mobile terminal with the uplink coverage limited condition or not. If the mobile terminal judges that the mobile terminal is the limited mobile terminal currently, when the mobile terminal needs to transmit uplink data, the mobile terminal requests the base station to assist the uplink data transmission so as to improve the signal intensity of the uplink data received by the base station. The method provided by the embodiment of the invention can be used for actively initiating the request by the mobile terminal needing to be assisted in a targeted manner, so that the communication quality of the mobile terminal is enhanced under the assistance of the base station and the assisting mobile terminal, the SINR of the uplink data received by the base station can be effectively improved, the accuracy of the base station for demodulating the uplink data is improved, the effect of uplink coverage is enhanced, and the balance of the uplink and downlink coverage ranges of the base station is facilitated.

When determining whether the mobile terminal is a limited mobile terminal, the uplink data transmission method provided in the embodiment of the present invention sets an entry condition and a departure condition, that is, a maximum value and a minimum value of a preset value range are used as determination conditions. The restricted mobile terminal which has satisfied the entry condition is not determined as the non-restricted mobile terminal immediately because the entry condition is not satisfied within the next trigger time, but is determined as the non-restricted mobile terminal only when the exit condition needs to be satisfied. Therefore, when the mobile terminal is located in the critical area with limited uplink coverage, the method in the embodiment of the invention avoids the problem that the mobile terminal is likely to switch too frequently between the limited state and the non-limited state.

Fig. 3 is a flowchart of another embodiment of a second uplink data transmission method according to the present invention, as shown in fig. 3, after step 202, the method further includes:

step 300, if the current state is idle and data can be captured on the resource designated by the base station, returning the confirmation assistance information according to the received assistance request sent by the base station.

When the mobile terminal needs to send uplink data to the base station but is in a condition of limited uplink transmission, the mobile terminal sends request information to the base station to request the base station to assist the uplink transmission; after receiving the request message, the base station searches for the mobile terminal currently in an idle state, i.e., not executing the communication service, in its service area.

When the base station selects to assist the mobile terminal, the base station sends an assistance request to the mobile terminal in an idle state in the service area, but the mobile terminal with the capability of capturing data on the designated resource of the base station can feed back to the base station. Therefore, even if the mobile terminal is determined to be a restricted mobile terminal within the last trigger time, the mobile terminal does not perform uplink data transmission, that is, is currently in an idle state, and can capture data on resources specified by the base station, which can also be used as an assisting mobile terminal. In such a case, if the restricted mobile terminal receives the assistance request sent by the base station and requests it to provide assistance for other restricted mobile in the service area of the base station, it correspondingly returns confirmation assistance information to the base station.

Step 301, receiving and forwarding data according to the received indication information which is sent by the base station and indicates to capture data on the first resource and forward to the base station by using the second resource.

After receiving the acknowledgement assistance information and receiving uplink data sent by the restricted mobile terminal requesting the assistance of the base station, the base station allocates resources for uplink transmission to the mobile terminal requesting the assistance and the mobile terminal providing the assistance respectively.

Accordingly, according to the instruction of the base station, the mobile terminal providing assistance, that is, the limited mobile terminal providing assistance in this embodiment, actively acquires the data on the first resource, and forwards the acquired data to the base station by using the second resource allocated to the mobile terminal by the base station.

When the mobile terminal determines that the uplink transmission of the mobile terminal is limited, if the mobile terminal does not currently execute the communication service and has the capability of acquiring data from the resource specified by the base station, the uplink data transmission method provided by the embodiment of the invention can also be used as an assistant mobile terminal. With the assistance of the assisting mobile terminal, even with the assistance of the limited mobile terminal with the assisting capability, the SINR of the uplink data received by the base station is enhanced, the accuracy of the base station demodulating the uplink data is improved, the uplink coverage effect of the base station is improved, and the balance of the uplink coverage range and the downlink coverage range of the base station is facilitated.

Further, in addition to the above embodiments, the step 301 may further include:

and amplifying the data captured on the first resource and then forwarding the data to the base station by using the second resource according to the received indication information which is sent by the base station and indicates that the data is captured on the first resource and is forwarded to the base station by using the second resource.

Specifically, when receiving and forwarding data according to the instruction of the base station, the mobile terminal providing assistance, that is, the restricted mobile terminal providing assistance in this embodiment, amplifies the signal strength of the data acquired on the first resource, and then forwards the data amplified by the signal strength to the base station by using the second resource.

According to the uplink data sending method provided by the embodiment of the invention, after the mobile terminal with assistance acquires the data according to the indication of the base station, the mobile terminal amplifies the signal intensity of the data and forwards the amplified signal intensity to the base station, so that the method is more favorable for improving the SINR of the uplink data received by the base station, improving the accuracy of uplink data demodulation of the base station, improving the uplink coverage effect of the base station and balancing the uplink and downlink coverage ranges of the base station.

Fig. 4 is a flowchart of a third embodiment of an uplink data transmission method according to the present invention, and as shown in fig. 4, the method includes:

step 401, according to the received assistance request sent by the base station, returning the confirmation assistance information.

In the embodiment of the invention, the mobile terminal which is currently in an idle state, namely does not execute the communication service and has the capability of capturing data on the resources specified by the base station can provide uplink transmission assistance for the limited mobile terminal which needs to perform uplink data transmission so as to enhance the strength of the base station receiving the uplink data transmitted by the limited mobile terminal.

When a mobile terminal sends a request message to the base station in the service area of the base station, the base station can correspondingly search the mobile terminal meeting the above conditions in the service area of the base station to serve as an assistant mobile terminal. Therefore, the assisting mobile terminal selected by the base station receives the assisting request sent by the base station, and returns the confirmation assisting information to the base station according to the assisting request.

Step 402, receiving and forwarding data according to the received indication information which is sent by the base station and indicates to capture data on the first resource and forward to the base station by using the second resource.

Correspondingly, the mobile terminal is assisted to actively acquire the data on the first resource according to the indication of the base station, and the acquired data is forwarded to the base station by using the second resource allocated to the mobile terminal by the base station.

According to the uplink data sending method provided by the embodiment of the invention, after the indication sent by the base station is received, the data is actively obtained according to the indication of the base station and forwarded to the base station, so that the SINR of the base station for receiving the uplink data can be effectively improved, the uplink coverage effect of the base station is improved, and the balance of the uplink coverage range and the downlink coverage range of the base station is facilitated.

Further, in addition to the above embodiments, the step 402 may further include:

and according to the received indication information which is sent by the base station and indicates that the data is captured on the first resource and is forwarded to the base station by using the second resource, amplifying the signal strength of the data captured on the first resource and then forwarding the data to the base station by using the second resource.

Fig. 5 is a flowchart of another embodiment of a third uplink data transmission method according to the present invention, as shown in fig. 4, before step 401 is executed, the method further includes:

step 400, detecting the received reference signals periodically sent by the base stations of the serving cell and the adjacent cell, and reporting the detection result to the base station of the serving cell, wherein the detection result includes whether the mobile terminal belongs to the limited mobile terminal.

Each base station periodically sends reference signals to mobile terminals in a service area of the base station, the mobile terminals detect and compare the received signal strength of the reference signals sent by the base station of the current service cell with the signal strength of the reference signals sent by the base stations of adjacent cells, and judge whether the mobile terminals are limited when the mobile terminals transmit uplink data with the base station of the current service cell, if so, the current state of the mobile terminals is judged to be limited, and if not, the current state of the mobile terminals is judged not to belong to the limited mobile terminals. And after the detection is finished, reporting the detection result of whether the mobile terminal belongs to the limited mobile terminal to the base station of the service cell.

The base station periodically sends the reference signal for detection to the mobile terminal, and accordingly, the mobile terminal periodically detects whether the mobile terminal belongs to the state of the limited mobile terminal, and reports the result to the base station after the detection is completed, so that the base station can periodically know the working state of each mobile terminal in the service area of the base station. Therefore, when the base station selects the assistant mobile terminal, whether the mobile terminal served by the base station is in an idle state or not and whether the mobile terminal is a limited mobile terminal can be known, and the assistant mobile terminal meeting the conditions is selected to provide uplink transmission assistance for the limited mobile terminal.

It can be understood that, in order to ensure normal communication between the base station and the mobile terminal, and the base station timely knows information such as the working state of the mobile terminal in its service area, for example, whether it is currently in an idle service state, and its location information, the mobile terminal will periodically report its state information to the base station. In this embodiment, the detection result of whether the mobile terminal belongs to the limited mobile terminal is reported to the base station, and the implementation manner of the detection result is consistent with the implementation manner when the mobile terminal reports other state information to the base station.

According to the uplink data transmission method provided by the embodiment of the invention, the mobile terminal correspondingly reports the periodically obtained checking result of whether the uplink transmission is limited to the base station, so that the base station can timely acquire the working state of the mobile terminal in the service area of the mobile terminal, the assistance can be provided for the limited mobile terminal, and the selection of the mobile terminal for assistance in the service area can be facilitated.

Further, on the basis of the foregoing embodiments, the limited mobile terminal is a mobile terminal whose RSRP of the neighboring cell is greater than the maximum value of the preset offset range of the RSRP of the serving cell, or whose RSRQ of the neighboring cell is greater than the maximum value of the preset offset range of the RSRQ of the serving cell, within the trigger time.

When the mobile terminal providing assistance for the restricted mobile terminal, that is, the assisting mobile terminal, becomes the restricted mobile terminal due to the movement of the position thereof, the communication method thereof is the same as the method for requesting uplink data enhancement described in the above embodiment, and details thereof are not repeated.

The uplink data transmission method provided by the invention uses the reference signal periodically transmitted to the mobile terminal by the base station as a judgment basis, and the mobile terminal judges whether the mobile terminal meets the entry condition or not according to the received signal strength of the reference signal of the current service cell and the reference signal of the adjacent cell, namely whether the mobile terminal is a limited mobile terminal with the uplink coverage limitation condition or not. If the mobile terminal judges that the mobile terminal is the limited mobile terminal currently, when the mobile terminal needs to transmit uplink data, the mobile terminal requests the base station to assist the uplink data transmission so as to improve the signal intensity of the uplink data received by the base station. The method provided by the embodiment of the invention can be used for actively initiating the request by the mobile terminal needing to be assisted in a targeted manner, so that the communication quality of the mobile terminal is enhanced under the assistance of the base station and the assisting mobile terminal, the SINR of the uplink data received by the base station can be effectively improved, the accuracy of the base station for demodulating the uplink data is improved, the effect of uplink coverage is enhanced, and the balance of the uplink and downlink coverage ranges of the base station is facilitated.

It can be understood that, the embodiments of the present invention are performed by combining uplink resource scheduling and a Hybrid Automatic Repeat Request (HARQ) mechanism, and the method is the same as the application method involved in the normal communication flow.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention, and as shown in fig. 6, the base station includes a first base station module 11, a second base station module 12, and a third base station module 13.

The first base station module 11 is configured to, according to received request information sent by a limited mobile terminal whose uplink transmission is limited, return response information indicating that the limited mobile terminal performs uplink transmission to the limited mobile terminal, and send an assistance request to an assistance mobile terminal in an idle state in a service area; the second base station module 12 is configured to allocate uplink transmission resources after receiving acknowledgement assistance information returned by the assisting mobile terminal according to the assistance request and uplink data sent by the limited mobile terminal according to the response information, instruct the limited mobile terminal to send data on a first resource, instruct the assisting mobile terminal to capture data on the first resource and forward the data by using a second resource, where the first resource is orthogonal to the second resource; the third base station module 13 is configured to demodulate and combine the data received on the first resource and the data received on the second resource, respectively, and obtain uplink data with enhanced signal strength.

Further, on the basis of the above embodiment, the limited mobile terminal includes a mobile terminal whose reference signal received power RSRP of the neighboring cell is greater than the maximum value of the preset offset range of the RSRP of the serving cell, or whose reference signal received quality RSRQ of the neighboring cell is greater than the maximum value of the preset offset range of the RSRQ of the serving cell, within the trigger time.

Specifically, the method for transmitting uplink data by the base station according to the embodiment of the present invention may refer to the processing steps described in the corresponding method embodiments, and details are not described here.

The base station provided by the embodiment of the invention searches the mobile terminal capable of providing assistance in the service area as the assisting mobile terminal after receiving the request sent by the limited mobile terminal, and when the limited mobile terminal sends uplink data of the limited mobile terminal, the assisting mobile terminal actively acquires the data sent by the limited mobile terminal according to the indication of the base station and forwards the acquired data to the base station, so that the base station not only can receive the uplink data sent by the limited mobile terminal, but also can receive the uplink data forwarded by the assisting mobile terminal. Therefore, the signal strength of the uplink data sent by the limited mobile terminal received by the base station is enhanced, the SINR of the uplink data received by the base station can be improved, the accuracy of the uplink data demodulation of the base station is improved, the uplink communication quality of the limited mobile terminal is improved, the uplink coverage effect can be effectively enhanced, and the balance of uplink and downlink coverage ranges is facilitated.

Fig. 7 is a schematic structural diagram of an embodiment of the limited mobile terminal of the present invention, and as shown in fig. 7, the limited mobile terminal includes a first limited terminal module 21, a second limited terminal module 22, and a third limited terminal module 23.

The first limited terminal module 21 is configured to detect a received reference signal periodically transmitted by a base station of a serving cell and an adjacent cell, and send request information for requesting assistance to the base station of the serving cell after determining that the first limited terminal module is a limited mobile terminal; the second limited terminal module 22 is configured to send uplink data according to response information indicating uplink transmission returned by the base station; the third limited terminal module 23 is configured to send uplink data according to the received indication information, which is sent by the base station and indicates that data is sent on the first resource.

Further, on the basis of the above embodiment, the limited mobile terminal includes a mobile terminal whose RSRP of the neighboring cell is greater than the maximum value of the preset offset range of the RSRP of the serving cell, or whose RSRQ of the neighboring cell is greater than the maximum value of the preset offset range of the RSRQ of the serving cell, within the trigger time.

Further, on the basis of the above embodiments, the restricted mobile terminal further includes a fourth restricted terminal module 24 and a fifth restricted terminal module 25.

The fourth limited terminal module 24 is configured to, when being in an idle state and being capable of capturing data on a resource designated by a base station at present, return an acknowledgment assistance information according to a received assistance request sent by the base station; the fifth limited terminal module 25 is configured to receive and forward data according to the received indication information, which is sent by the base station and indicates to capture data on the first resource and forward the data to the base station by using the second resource.

Further, on the basis of the foregoing embodiments, the fifth limited terminal module 25 is further configured to, according to the received indication information that is sent by the base station and indicates that data is captured on the first resource and is forwarded to the base station by using the second resource, perform signal strength amplification on the data captured on the first resource, and forward to the base station by using the second resource.

Specifically, the method for sending uplink data by the limited mobile terminal provided in the embodiment of the present invention may refer to the processing steps described in the corresponding method embodiments, and details are not described here.

According to the limited mobile terminal provided by the embodiment of the invention, when the mobile terminal judges that the mobile terminal has the uplink transmission limitation condition and needs to perform uplink transmission, the mobile terminal actively initiates a request to the base station to request the base station for assistance based on the uplink transmission, and transmits uplink data on the allocated resources according to the indication of the base station. By adopting the method provided by the embodiment of the invention, only the limited mobile terminal is assisted, the influence on other mobile terminals in the communication system is small, the limited mobile terminal correspondingly sends uplink data according to the indication sent by the base station, the assisting operation is finished by the base station and the assisting mobile terminal, the higher requirement on the configuration of the limited mobile terminal is not met, and the influence on the performance of the limited mobile terminal is not caused. Meanwhile, the limited mobile terminal in the idle state can also be used as an assistant mobile terminal to provide uplink transmission assistance for other limited mobile terminals. On the premise of not influencing the communication of the limited mobile terminal, the base station is matched with the assistant mobile terminal, so that the SINR of the received limited mobile uplink data can be effectively improved on the base station side, the accuracy of the base station for demodulating the uplink data is improved, the uplink coverage effect of the base station is effectively improved, and the balance of the uplink coverage range and the downlink coverage range of the base station is facilitated.

Fig. 8 is a schematic structural diagram of an assisting mobile terminal according to an embodiment of the present invention, and as shown in fig. 8, the assisting mobile terminal includes a first assisting terminal module 31 and a second assisting terminal module 32.

The first assisting terminal module 31 is configured to return an acknowledgement assistance message according to the received assistance request sent by the base station; the second assistant terminal module 32 is configured to receive and forward data according to the received indication information which is sent by the base station and indicates to capture data on the first resource and forward the data to the base station by using the second resource.

Further, on the basis of the foregoing embodiment, the second assisting terminal module 32 is further configured to, according to the received indication information that is sent by the base station and indicates that data is captured on the first resource and is forwarded to the base station by using the second resource, perform signal strength amplification on the data captured on the first resource, and forward to the base station by using the second resource.

Further, on the basis of the above embodiments, the assisting mobile terminal further includes a third assisting terminal module 33. The third assisting terminal module 33 is configured to detect a received reference signal periodically sent by the base stations of the serving cell and the neighboring cell, and report a detection result to the base station of the serving cell, where the detection result includes whether the terminal belongs to a limited mobile terminal.

Further, on the basis of the foregoing embodiments, the limited mobile terminal includes a mobile terminal whose RSRP of the neighboring cell is greater than the maximum value of the preset offset range of the RSRP of the serving cell, or whose RSRQ of the neighboring cell is greater than the maximum value of the preset offset range of the RSRQ of the serving cell, within the trigger time.

Specifically, the method for assisting the mobile terminal to transmit the uplink data provided in the embodiment of the present invention may refer to the processing steps described in the corresponding method embodiments, and details are not described here.

According to the mobile terminal assisting the base station in the embodiment of the invention, after the indication sent by the base station is received, the data is actively obtained according to the indication of the base station and forwarded to the base station, so that the SINR of the base station for receiving the uplink data can be effectively improved, the accuracy of the base station for demodulating the uplink data is improved, the uplink coverage effect of the base station is improved, and the balance of the uplink coverage range and the downlink coverage range of the base station is facilitated.

Fig. 9 is a schematic structural diagram of a communication system according to the present invention, as shown in fig. 9, the communication system includes a base station 1 in any one of the above embodiments, a restricted mobile terminal 2 in any one of the above embodiments, and at least one assisting mobile terminal 3 in any one of the above embodiments, and the base station 1, the restricted mobile terminal 2, and the at least one assisting mobile terminal 3 are communicatively connected.

Specifically, the base station 1 periodically transmits a reference signal to the mobile terminal in its service area, and the mobile terminal determines whether there is a situation that uplink transmission is limited according to the received strength of the reference signals of the service area and the neighboring area, and if so, it becomes the limited mobile terminal 2. When the limited mobile terminal 2 needs to transmit uplink data, request information for requesting assistance is sent to the base station 1; after receiving the request information sent by the limited mobile terminal 2, the base station 1 returns response information indicating that the base station carries out uplink data transmission to the limited mobile terminal, selects a mobile terminal meeting the conditions in the service area as an assisting mobile terminal 3, and sends an assisting request to the assisting mobile terminal 3; after receiving the assistance request, the assistance mobile terminal 3 returns the confirmation assistance information to the base station 1; after receiving the uplink data sent by the limited mobile terminal 2 and receiving the confirmation assistance information returned by the assistance mobile terminal 3, the base station 1 redistributes the transmission resources, instructs the limited mobile terminal 2 to send the uplink data on the first resource, instructs the assistance mobile terminal 3 to actively acquire the data on the first resource, and sends the acquired data to the base station 1 by using the second resource; and the base station 1 demodulates and combines the data received from the first resource and the second resource respectively to obtain the enhanced uplink data.

The base station, the limited mobile terminal and the assisting mobile terminal related to the communication system provided by the embodiment of the present invention may all adopt the base station, the limited mobile terminal and the assisting mobile terminal provided by the above embodiments, and details are not repeated herein.

In the communication system provided by the embodiment of the present invention, after receiving the request sent by the limited mobile terminal, the base station searches for a mobile terminal capable of providing assistance in its service area as an assistance mobile terminal, and when the limited mobile terminal sends uplink data of the limited mobile terminal, the assistance mobile terminal actively acquires data sent by the limited mobile terminal according to an instruction of the base station and forwards the acquired data to the base station, so that the base station can receive not only the uplink data sent by the limited mobile terminal but also the uplink data forwarded by the assistance mobile terminal. Therefore, the signal strength of the uplink data sent by the limited mobile terminal received by the base station is enhanced, the SINR of the uplink data received by the base station can be improved, the accuracy of the uplink data demodulation of the base station is improved, the uplink communication quality of the limited mobile terminal is improved, the uplink coverage effect can be effectively enhanced, and the balance of uplink and downlink coverage ranges is facilitated.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An uplink data transmission method, comprising:

2. The uplink data transmission method according to claim 1, wherein the restricted mobile terminal comprises:

and in the triggering time, the reference signal received power RSRP of the adjacent cell is larger than the maximum value of the preset offset range of the RSRP of the serving cell, or the reference signal received quality RSRQ of the adjacent cell is larger than the maximum value of the preset offset range of the RSRQ of the serving cell.

3. The uplink data transmission method according to claim 2, wherein the restricted mobile terminal switches to the state of the unrestricted mobile terminal in a next trigger time if the RSRP of the neighboring cell is smaller than the minimum value of the preset offset range of the RSRP of the serving cell, or the RSRQ of the neighboring cell is smaller than the minimum value of the preset offset range of the RSRQ of the serving cell.

4. The uplink data transmitting method according to claim 3, wherein the assisting mobile terminal is an unrestricted mobile terminal.

5. The uplink data transmitting method according to claim 4, wherein the assisting mobile terminal is located within a preset range between the restricted mobile terminal and a base station location.

6. An uplink data transmission method, comprising:

7. The uplink data transmission method according to claim 6, wherein the restricted mobile terminal comprises:

the mobile terminal is used for judging whether the RSRP of the adjacent cell is larger than the maximum value of the preset offset range of the RSRP of the serving cell or the RSRQ of the adjacent cell is larger than the maximum value of the preset offset range of the RSRQ of the serving cell within the trigger time;

correspondingly, the limited mobile terminal is switched to the state of the non-limited mobile terminal in the next trigger time if the RSRP of the adjacent cell is smaller than the minimum value of the preset offset range of the RSRP of the serving cell, or the RSRQ of the adjacent cell is smaller than the minimum value of the preset offset range of the RSRQ of the serving cell.

8. The uplink data transmitting method according to claim 6, wherein the method further comprises:

if the current state is idle and data can be captured on the resources appointed by the base station, returning confirmation assistance information according to the received assistance request sent by the base station;

9. The uplink data transmitting method according to claim 8, wherein the receiving and forwarding data according to the received indication information sent by the base station and indicating that data is captured on the first resource and forwarded to the base station by using the second resource comprises:

10. A base station, comprising:

11. The base station of claim 10, wherein the restricted mobile terminal comprises:

12. The base station of claim 11, wherein the restricted mobile terminal switches to the state of the unrestricted mobile terminal when the RSRP of the neighboring cell is less than the minimum value of the preset offset range of the RSRP of the serving cell or the RSRQ of the neighboring cell is less than the minimum value of the preset offset range of the RSRQ of the serving cell during the next trigger time.

13. The base station of claim 12, wherein the assisting mobile terminal is an unrestricted mobile terminal.

14. The base station of claim 13, wherein the assisting mobile terminal is located within a predetermined range between the restricted mobile terminal and a base station location.

15. A restricted mobile terminal, comprising:

16. The constrained mobile terminal of claim 15, wherein the constrained mobile terminal comprises:

17. The constrained mobile terminal of claim 15, wherein the constrained mobile terminal further comprises:

the fourth limited terminal module is used for returning confirmation assistance information according to a received assistance request sent by the base station when the fourth limited terminal module is in an idle state at present and can capture data on resources appointed by the base station;

and the fifth limited terminal module is used for receiving and forwarding the data according to the received indication information which is sent by the base station and indicates that the data is captured on the first resource and is forwarded to the base station by using the second resource.

18. The constrained mobile terminal of claim 17, wherein the fifth constrained terminal module is further configured to:

19. A communication system comprising a base station according to any of claims 10 to 14, a restricted mobile terminal according to any of claims 15 to 18, and an assisting mobile terminal; the base station, the limited mobile terminal and the assisting mobile terminal are in communication connection; wherein,

the assisting mobile terminal includes:

and the second assistant terminal module is configured to receive and forward data according to the received indication information which is sent by the base station and indicates that data is captured on the first resource and is forwarded to the base station by using the second resource, so that the base station demodulates and combines the data received on the first resource and the data received on the second resource respectively to obtain uplink data with enhanced signal strength, where the first resource and the second resource are both resources for uplink transmission.