CN104902579B - In a kind of wireless network communications system between terminal direct-connected communication method - Google Patents
In a kind of wireless network communications system between terminal direct-connected communication method Download PDFInfo
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- H—ELECTRICITY
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- H04W28/00—Network traffic management; Network resource management
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- H04W28/0215—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The present invention provides a kind of method of direct-connected communication between terminal in wireless network communications system, comprising: server is the direct-connected communication resource of terminal assignments being authorized in direct-connected communication scenes；According to the direct-connected communication resource of appointment, the terminal in set of terminal carries out the direct-connected communication between terminal and terminal；Have in set of terminal established between base station two-way link ability part terminal can to server feedback measure statistical information；Direct communication measurement statistical information and current system conditions of the server according to feedback, adjustresources appointment.In wireless network communications system of the invention between terminal direct-connected communication method, avoid consumption of the connection-oriented communication process to electric power；And time-multiplexed mode is used, it is compatible with existing wireless communications system；System time gap resource used in the direct-connected communication of terminal room simultaneously is configured by the server being arranged, and server can adjust distributing slot resources, improve resource utilization ratio according to measurement statistical information.
Description
Technical Field
The invention relates to the technical field of wireless network communication, in particular to a method for direct communication between terminals in a wireless network communication system.
Background
In a wireless network communication system, a bluetooth technology is a typical direct connection communication technology with low power consumption between terminals. Bluetooth is a radio technology that supports short-range communication (typically within 10 m) between devices, enabling wireless information exchange between many devices, including mobile phones, PDAs, wireless headsets, laptops, related peripherals, etc. The use of bluetooth technology can effectively simplify the communication between mobile communication terminal devices and also successfully simplify the communication between the devices and the internet, so that data transmission becomes faster and more efficient, and the way for wireless communication is widened. Bluetooth adopts a distributed network structure and a fast frequency hopping and short packet technology, supports point-to-point and point-to-multipoint communication, works in a global universal 2.4GHz Industrial, Scientific and Medical (ISM) frequency band, has a data rate of 1Mbps, and adopts a time division duplex transmission scheme to realize full duplex transmission.
With the development of the internet of things technology, the low-power-consumption direct communication and data interaction technology between terminals is more and more emphasized. The typical feature of the application scenario of the internet of things is the aggregation of a large number of devices in a limited area. It is estimated that by 2020, the number of interconnected devices per square kilometer will exceed 40 million in a typical internet of things application scenario. Therefore, at that time, bluetooth technology will not be able to cope with this application scenario.
For the conventional wireless communication technology, under the control of a wireless base station, communication between a terminal and a terminal realizes data interaction between the terminal and the terminal through data transfer of a wireless network. The primary goal of wireless communication technology is to provide a wireless network with seamless coverage over a wide area. In order to ensure the continuity of data communication between terminals, a mobile terminal performs various measurements and information interaction with a radio base station at a certain frequency, and needs to maintain a connection state with the radio base station during communication. However, this process may cause power consumption of the terminal, and cannot meet the internet of things interconnection requirement of low power consumption.
However, the traditional wireless communication technology has the characteristics of controllability and large capacity, the communication frequency is an authorized proprietary frequency spectrum, and the interference level is in a controllable state. How to combine the characteristics of two communication technologies and provide a controllable high-capacity low-power direct connection technology becomes a current popular research subject.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a method for directly communicating between terminals in a wireless network communication system, which is compatible with the existing mobile wireless communication network and can comprehensively consider the load of the system, the transmission bandwidth and the capability requirement of the terminals.
To achieve the above and other related objects, the present invention provides a method for direct communication between terminals in a wireless network communication system, which at least includes: the server assigns direct connection communication resources for authorized terminals in the direct connection communication scene; wherein the direct communication resources are time slot resources; according to the assigned direct connection communication resource, the terminals in the terminal group carry out direct connection communication between the terminals; some terminals in the terminal group, which have the capability of establishing a bidirectional link with the base station, can feed back measurement statistical information to the server; and the server adjusts the resource assignment according to the fed-back direct communication measurement statistical information and the current system state.
According to the method for direct communication between terminals in the wireless network communication system, the method comprises the following steps: only authorized terminals can decode direct communication resources and direct connection information; all authorized terminals in the direct communication scenario can receive the resource assignment identified by the direct communication scenario.
According to the method for direct communication between terminals in the wireless network communication system, the method comprises the following steps: and the carrier frequency used by the direct connection communication is the uplink carrier frequency of the system.
According to the method for direct communication between terminals in the wireless network communication system, the method comprises the following steps: the measurement statistical information comprises the quality of a direct connection communication channel and the utilization rate of resources.
According to the method for direct communication between terminals in the wireless network communication system, the method comprises the following steps: if a terminal participates in a plurality of direct communication scenarios, the terminal can feed back a plurality of measurement statistical information to the base station.
According to the method for direct communication between terminals in the wireless network communication system, the method comprises the following steps: the direct connection communication is divided into a controlled mode and a free mode, the direct connection communication between the terminals is a communication mode facing to non-link, and the terminals and the wireless base station are not required to be in a connection state.
Further, according to the method for direct communication between terminals in the wireless network communication system, the method comprises: when the direct connection communication of the controlled mode is realized in the LTE system, the direct connection communication resource is LTE uplink time slot resource, wherein,
the method comprises the steps that a server sends resource allocation messages to all authorized terminals in a direct connection communication scene, wherein the resource allocation messages are encrypted NAS messages;
the server sends a signaling to the base station and reserves an uplink time slot resource for a direct connection communication scene, wherein the reserved time slot resource is consistent with the content in the NAS message;
the server selects the D-RNTI as a temporary indication of the wireless network; the base station loads the NAS information on the PDSCH and sends the NAS information to an authorized terminal in the terminal group; PDSCH resources bearing the NAS information are indicated by a PDCCH, and the PDCCH is identified by a D-RNTI;
and the terminal detects the PDCCH identified by the D-RNTI, acquires PDSCH resource mapping information of the NAS message, and then decodes the NAS message by using a private key to acquire authorized resource information of the terminal group.
Further, according to the method for direct communication between terminals in the wireless network communication system, the method comprises: when the direct connection communication of the free mode is realized in the LTE system, the direct connection communication resource is LTE uplink time slot resource, wherein,
the server allocates direct connection communication resources; the base station broadcasts the direct connection communication resource information in a cell in a mode of system broadcast messages;
and the terminal receives the direct connection communication resource assignment broadcast message and performs direct connection communication between the terminal and the terminal by adopting a direct connection communication resource competition mode.
According to the method for direct communication between terminals in the wireless network communication system, the method comprises the following steps: the method for resource allocation in the direct communication scene comprises the following steps:
the data receiving end measures available direct connection communication resources, and sends resource information meeting quality requirements as candidate resource information to the data sending end in a random access preamble response message;
the data sending end measures available direct connection communication resources, screens candidate resources according to a measurement result, and sends screened resource information to the data receiving end in a data sending request message;
and the data receiving end sends the direct connection communication resources for data sending to the data sending end in the data sending request response message according to the resources screened by the data sending end.
According to the method for direct communication between terminals in the wireless network communication system, the method comprises the following steps: when the direct communication between terminals is realized in an LTE system, the direct communication resource is an LTE uplink time slot resource, and the carrier frequency is an LTE system uplink channel carrier frequency; wherein,
the data sending end performs the following operations:
a data sending end sends a random access preamble in a random access channel;
after the data sending end sends the random access preamble, the data sending end waits for a random access preamble response instruction in a window, the random access preamble response instruction is a PUCCH identified by RA-RNTI, and the size of the window is configured by an LTE system;
if the data sending end detects the random access preamble response indication in the waiting window, receiving the random access preamble response according to the PUSCH resource identified by the random access preamble response indication, or else, sending the random access preamble again after waiting a certain interval;
the data sending end carries the random access preamble response message according to the PUSCH indicated by the random access preamble response indication, receives the random access preamble response data, and judges whether the following conditions are satisfied:
a. the data sending end successfully decodes the random access preamble response data packet;
b. the random access preamble identification is consistent with the random access preamble sent by the data sending end before;
c. the identity verification of the data receiving end is passed;
d. the data transmission resource distributed by the data receiving end meets the requirement;
e. the temporary identity distributed to the data sending end by the data receiving end meets the requirement;
if the condition is satisfied, the data sending end sends a data sending request message indication and a data sending request message in the PUSCH resource configuration indicated by the random access preamble response; if not, after a period of time, continuing to send the random access preamble;
after the data sending end sends the data sending request message, the data sending end waits for a PUCCH message indicated by the C-RNTI in a window, and the PUCCH message is a data sending request response indication; if a data sending request response instruction is received, receiving a data sending request response message according to the PUSCH resource mapping rule carried by the data sending request response instruction; if the data transmission request response indication is not received in the window, the random access preamble is transmitted again after a period of time;
the data sending end sends data according to the PUSCH resources and the time slot resources distributed by the data sending request response message;
the data receiving end comprises the following operations:
the data receiving end detects the random access preamble according to the random access preamble sending rule predefined by the LTE system;
after a data receiving end correctly detects the random access preamble, using RA-RNTI to mark a PUCCH, sending a random access preamble response instruction, and sending a random access preamble response message in a PUSCH channel marked by the response instruction;
after the data receiving end finishes sending the random access preamble response, detecting a data sending request indication of the data sending end in the window, if the data sending request indication of the data sending end is received, receiving the data sending request message according to PUSCH (physical uplink shared channel) information carried by the data sending request indication message of the data sending end, and sending the data sending request response to the data sending end according to the content of the data sending request message; otherwise, the flow is ended;
and the data receiving end receives the data sent by the data sending end on the allocated PUSCH channel resources.
As described above, the method for direct communication between terminals in a wireless network communication system of the present invention has the following beneficial effects:
(1) in the direct connection communication process between the terminal and the terminal, the condition that the connection state with the wireless base station is not required to be maintained is not met, and the direct connection communication process between the terminal and the terminal is a non-connection communication process, so that the consumption of the connection-oriented communication process on electric power can be avoided;
(2) the direct connection communication between the terminal and the communication between the terminal and the base station adopt a time division multiplexing mode, coexist in a system and are compatible with the existing wireless communication system;
(3) the system time slot resources used by the direct communication between the terminal and the terminal are configured by the set server, and the server can adjust the time slot resource allocation according to the measurement statistical information, so that the utilization rate of the system resources is improved.
Drawings
Fig. 1 is a schematic diagram illustrating a process of direct communication between terminals in a wireless network communication system according to the present invention;
fig. 2 is a schematic diagram illustrating a process of deploying the same direct communication scenario in multiple cells in a controlled mode according to the present invention;
fig. 3 is a schematic flow chart illustrating a scenario of deploying the same direct communication in multiple cells in the controlled mode of the present invention;
FIG. 4 is a schematic diagram illustrating a process of direct communication between a terminal and a terminal in a free mode according to the present invention
Fig. 5 is a flowchart of direct communication between terminals based on contention and handshake in the present invention;
fig. 6 is a flowchart illustrating negotiation for resource allocation in a direct communication scenario according to the present invention;
fig. 7 is a schematic diagram illustrating an implementation of controlled mode direct communication in an LTE system according to the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The invention realizes the direct connection communication mode between terminals in the existing wireless communication system in a time division multiplexing mode. The direct communication mode is classified into a controlled mode and a free mode. Under the controlled mode, a direct connection communication service with guaranteed quality can be provided for authorized terminals. In the free mode, the operator can provide public direct connection communication services with non-quality assurance for all terminals in the wireless coverage area according to the needs. The direct communication between the terminals is a communication mode facing to non-link, and does not require the connection state between the terminals and the wireless base station.
Referring to fig. 1, a method for direct communication between terminals in a wireless network communication system according to the present invention includes:
the server assigns direct communication resources to authorized terminals in the direct communication scenario, wherein the resource assignment is identified by direct communication scenario identification D2 DkesID. In fig. 1, 2 groups of terminals perform direct communication, which are scenes D2DCaseIDA and D2DCaseID B, and are represented by areas indicated by dotted lines and areas indicated by dotted lines, respectively. Only authorized terminals can decode the direct communication resources and the direct connection information. Wherein, the direct connection communication resource is a time slot resource.
All authorized terminals in the terminal group in the cell can receive the resource assignment identified by the direct communication scenario D2 DCaseID. And according to the assigned direct connection communication resource, the terminals in the terminal group carry out direct connection communication between the terminals.
In the terminal group, part of terminals have the capability of establishing a bidirectional link with the base station. The terminals can feed back measurement statistical information including the quality of the direct connection communication channel and the resource utilization rate to the server Y. And the measurement statistical information is identified by using a direct communication scene D2DCaseID participated by the terminal. If a terminal participates in a plurality of direct communication scenes, the terminal can feed back a plurality of measurement statistical information to the base station and respectively uses the D2DCaseID for identification.
And the server Y adjusts the resource assignment according to the fed-back direct communication measurement statistical information and the current system state.
Example one
Referring to fig. 2 and fig. 3, the present embodiment is a process of deploying the same direct communication scenario in multiple cells in the controlled mode. Wherein, base station a and base station B correspond to two cells Cell a and Cell B, respectively. Authorized terminals in the direct communication scenario D2DCaseX are distributed in Cell a and Cell B. The server assigns resource allota and resource allotb for D2DCaseX for Cell a and Cell B, respectively. And the authorized terminal in the D2DCaseX determines that the resident cells are the Cell A and the Cell B according to the strength and the quality of the pilot signals of the Cell A and the Cell B. And the D2DCaseX terminal residing in the Cell performs direct communication by using the resource assignment of the current Cell.
Example two
Referring to fig. 4, the present embodiment is a process of direct connection communication between a terminal and a terminal in a free mode. Wherein, under the control of the server, the base station broadcasts the public direct connection communication resource in the cell. And the terminal receives the time slot resource assignment broadcast message in the resident cell. The terminal carries out direct communication between the terminal and the terminal in a resource competition mode.
EXAMPLE III
Referring to fig. 5, in the present embodiment, in the method for direct connection communication between terminals based on contention and handshake, all information exchanged between a sending end and a receiving end is carried on a direct connection communication resource allocated in a cell. The method specifically comprises the following steps:
step 1, a data sending end sends a random access preamble on a random access channel in the direct connection communication resource, and monitors a random access preamble response indication of a data receiving end in a preset window after sending the random access preamble.
Step 2, the data receiving end monitors the random access preamble on the random access channel and responds to the monitored preamble, and the preamble response comprises the following contents:
a. a random access preamble response indication, sent on a control channel in the direct connection communication resource, scrambled by a predefined code, indicating resource mapping of a random access preamble response data packet on a traffic channel;
b. a random access preamble response packet comprising: the received random access preamble identification, the data receiving end identity identification, the resource allocation which can be used by a transmitting end channel and the data transmitting end temporary identity identification;
c. the random access preamble response packet may be selected to be transmitted in an encrypted mode.
Step 3, if the data sending end monitors the random access preamble response indication of the data receiving end in a preset window, the data sending end receives the random access preamble response data according to the service channel resource identified by the preamble response indication and judges whether the following contents are true or not:
a. the data sending end successfully decodes the random access preamble response data packet;
b. the random access preamble identification is consistent with the random access preamble identification sent by the data sending end before;
c. the identity verification of the data receiving end is passed;
d. the data transmission resource distributed by the data receiving end meets the requirement;
e. the temporary identity distributed by the data receiving end to the data sending end meets the requirement.
If all the judgments are true, executing step 4, otherwise, according to the predefined rule, after a period of time, retransmitting the random access preamble.
And 4, the data sending end sends data, a request message instruction and a control channel for sending the message instruction on a special control channel. The control channel is scrambled by the temporary identity of the data sending end. The data transmission request message is carried on the service channel resource identified by the data transmission request message indication, and the data transmission request message includes:
a. data sending end identity information;
b. the terminal sends the type identification of the data;
c. sending a data security identifier;
d. available candidate resources;
e. the size of the data volume;
f. the data packet may be sent in an encrypted mode.
Step 5, after the data receiving end sends the random access preamble response message, in a preset window, monitoring the data sending request message indication, and executing the following judgment operation:
a. according to the message bearing resource corresponding to the data transmission request message indication, successfully decoding the data transmission request message;
b. the identity of the sending terminal is identified, and the identity information of the sending terminal is confirmed to meet the requirements;
c. checking that the data security identification meets the requirement;
d. checking that the data type identification meets the requirements;
e. resources can be sent for a data sending end;
if all the operation decisions are successful, executing step 6, otherwise, ending the process.
Step 6, the data receiving end responds to the data sending request message of the data sending end, and sends a data request response indication and a data request response data packet, the data request response indication is carried on a special control channel in the direct connection communication resource, the control channel is identified by a temporary identity ID allocated by the data sending end, and the response message comprises the following contents:
a. receiving end identity identification;
b. allocating data transmission resources;
c. a data transmission resource repetition period;
d. the data packet may be sent in an encrypted mode.
Step 7, after the data sending end finishes sending the data sending request message, monitoring the data sending request response message indication in a preset window, and executing the following judgment operations:
a. verifying the identity identification of the receiving terminal;
b. and verifying the resource allocation.
And when all operation decisions are successful, transmitting the data on the allocated resources.
And step 8, the data sending end sends data on the allocated resources.
And 9, if the data sending end sends data after the data is sent for the last time on the allocated resources, attaching a data sending request message to the resource request mark position 1 of the data packet head, starting a waiting window after the data packet is sent, and if a response message of the receiving end is received in the window period, continuing sending the data according to the newly allocated resources. Otherwise, the step 1 is executed again.
And step 10, the data receiving end responds to the new data sending request message.
And step 11, the data sending end sends data on the newly allocated resources.
Example four
Referring to fig. 6, the present embodiment is a method for resource allocation negotiation in a direct communication scenario, and the present embodiment includes the following contents:
the data receiving end measures the available direct connection communication resources, takes the resource information meeting the quality requirement as candidate resource information, and sends the candidate resource information to the data sending end in a random access preamble response message;
the data sending end measures the available direct connection communication resources, screens candidate resources according to the measurement result, and sends the screened resource information to the data receiving end in the data sending request message;
and the data receiving end sends the time slot resource for data transmission to the data transmitting end in the data transmission request response message according to the resource screened by the data transmitting end.
EXAMPLE five
Referring to fig. 7, the present embodiment is a method for implementing direct communication in a controlled mode in an LTE system. Wherein: the direct connection communication resource is an LTE uplink time slot resource. The method specifically comprises the following steps:
and the server sends resource allocation information for all authorized terminals in the D2DCase group through the base station. The resource allocation message is an encrypted Non Access Stratum (NAS) packet.
And the server sends a signaling to the base station and reserves uplink time slot resources for the D2DCase group, wherein the reserved time slot resources are consistent with the contents in the resource allocation NAS message.
And selecting a value called D-RNTI from the reserved RNTIs FFF 4-FFFC as a temporary indication of a wireless network D2D.
The base station loads the NAS message on a Physical Downlink Shared Channel (PDSCH), and sends the NAS message to an authorized terminal in the D2DCase group.
The PDSCH resource carrying the NAS message is indicated by a Physical Downlink Control Channel (PDCCH), and the PDCCH is identified by the D-RNTI.
And the terminal detects the PDCCH channel identified by the D-RNTI and acquires PDSCH resource mapping information of the NAS message.
And the terminal decodes the NAS message by using the private key to acquire the authorized resource information of the D2DCase group.
EXAMPLE six
The embodiment is a method for implementing free mode direct communication in an LTE system, and the embodiment includes the following contents:
the server allocates free mode direct connection communication resources; and the base station broadcasts the direct connection communication resource information in the cell in a mode of system broadcast messages. And the terminal receives the time slot resource assignment broadcast message in the resident cell. The terminal carries out direct communication between the terminal and the terminal in a resource competition mode. Wherein, the direct connection communication resource is LTE uplink time slot resource.
EXAMPLE seven
The embodiment is a method for realizing direct communication between terminals in an LTE system, and it is assumed that the terminals already know available direct communication resources according to the fifth and sixth embodiments, all operations are performed on allocated LTE uplink timeslot resources, and a carrier frequency is an LTE system uplink channel carrier frequency.
The data sending end comprises the following operations:
1. the data transmitting end transmits a random access preamble in a random access channel.
2. After the data sending end sends the random access preamble, a random access preamble response indication is waited in a window, the random access preamble response indication is a Physical Uplink Control Channel (PUCCH) identified by RA-RNTI, and the window size is configured by an LTE system.
3. If the data sending end detects the random access preamble response indication in the waiting window, the data sending end receives the random access preamble response according to the Physical Uplink Shared Channel (PUSCH) resource identified by the random access preamble response indication, otherwise, sends the random access preamble again after waiting a certain interval.
4. The data sending end carries out the relevant operation of step 3 in the fourth embodiment according to the random access preamble response message carried by the PUSCH channel represented by the random access preamble response indication. If the decision is passed, step 5 is executed, otherwise, after a period of time, the random access preamble is continuously sent.
5. The data sending end sends a data sending request message indication and a data sending request message in the PUSCH resource configuration indicated by the random access preamble response, wherein
a. The data sending request message indicates a PUCCH (physical uplink control channel) identified by a C-RNTI (temporary radio network identity indication) distributed by the data sending end for the data receiving end, and information carried in the PUCCH is PUSCH resource information carrying the data sending request message;
b. the data transmission request message includes: the method comprises the steps of data sending end identity identification information, a terminal data sending type identification, a data sending safety identification, available candidate resources and a data volume.
6. After the data sending end sends the data sending request message, the data sending end waits for the PUCCH message indicated by the C-RNTI in the window, and the message is a data sending request response indication; and if the response indication is received, receiving a data transmission request response message according to the PUSCH resource mapping rule carried by the response indication, wherein the window size is configured by the LTE system. If no response indication is received within the window, the random access preamble is transmitted again after a time interval.
7. And the data sending end sends the data according to the PUSCH resource and the time slot resource distributed by the data sending request response message.
The data receiving end comprises the following operations:
1. and the data receiving end detects the random access preamble according to the random access preamble sending rule predefined by the LTE system.
2. After a data receiving end correctly detects the random access preamble, using RA-RNTI to mark PUCCH, sending a random access preamble response instruction, and sending a random access preamble response message in a PUSCH channel marked by the response instruction, wherein the preamble response message comprises:
a. a received random access preamble identity;
b. data receiving end identity identification;
c. distributing the available resources of the sending end channel;
d. and the data sending end temporary identity C-RNTI.
3. After the data receiving end sends the random access preamble response, the data sending request indication of the data sending end is detected in the window, if the data sending request indication of the data sending end is received, the step 4 is executed, otherwise, the process is ended.
4. And the data receiving end receives the data sending request message according to the PUSCH information carried by the data sending request indication message of the data sending end, and sends a data sending request response to the data sending end according to the message content.
5. And the data receiving end receives the data sent by the data sending end on the allocated PUSCH channel resources.
In summary, in the method for direct communication between terminals in the wireless network communication system of the present invention, the direct communication process between the terminal and the terminal is a non-connection communication process, which can avoid the consumption of power in the connection-oriented communication process; the direct connection communication between the terminal and the communication between the terminal and the base station adopt a time division multiplexing mode, coexist in a system and are compatible with the existing wireless communication system; the system time slot resources used by the direct communication between the terminal and the terminal are configured by the set server, and the server can adjust the time slot resource allocation according to the measurement statistical information, so that the utilization rate of the system resources is improved. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A method for direct communication between terminals in a wireless network communication system is characterized by at least comprising the following steps:
the server assigns direct connection communication resources for authorized terminals in the direct connection communication scene; wherein the direct communication resources are time slot resources;
according to the assigned direct connection communication resource, the terminals in the terminal group carry out direct connection communication between the terminals;
some terminals in the terminal group, which have the capability of establishing a bidirectional link with the base station, can feed back measurement statistical information to the server;
the server adjusts resource assignment according to the fed-back direct communication measurement statistical information and the current system state;
the direct connection communication is divided into a controlled mode and a free mode, the direct connection communication between the terminals is a communication mode facing to non-link, and the terminals and the wireless base station are not required to be in a connection state;
when the direct connection communication in the controlled mode is realized in an LTE system, the direct connection communication resource is an LTE uplink time slot resource, wherein a server sends resource allocation information to all authorized terminals in a direct connection communication scene, and the resource allocation information is encrypted NAS information; the server sends a signaling to the base station and reserves an uplink time slot resource for a direct connection communication scene, wherein the reserved time slot resource is consistent with the content in the NAS message; the server selects the D-RNTI as a temporary indication of the wireless network; the base station loads the NAS information on the PDSCH and sends the NAS information to an authorized terminal in the terminal group; PDSCH resources bearing the NAS information are indicated by a PDCCH, and the PDCCH is identified by a D-RNTI; the terminal detects the PDCCH of the D-RNTI identification, acquires PDSCH resource mapping information of the NAS information, and then decodes the NAS information by using a private key to acquire authorized resource information of the terminal group;
when the direct connection communication of the free mode is realized in an LTE system, the direct connection communication resources are LTE uplink time slot resources, wherein the server distributes the direct connection communication resources; the base station broadcasts the direct connection communication resource information in a cell in a mode of system broadcast messages; and the terminal receives the direct connection communication resource assignment broadcast message and performs direct connection communication between the terminal and the terminal by adopting a direct connection communication resource competition mode.
2. The method of claim 1, wherein the method comprises the steps of: only authorized terminals can decode direct communication resources and direct connection information; all authorized terminals in the direct communication scenario can receive the resource assignment identified by the direct communication scenario.
3. The method of claim 1, wherein the method comprises the steps of: and the carrier frequency used by the direct connection communication is the uplink carrier frequency of the system.
4. The method of claim 1, wherein the method comprises the steps of: the measurement statistical information comprises the quality of a direct connection communication channel and the utilization rate of resources.
5. The method of claim 1, wherein the method comprises the steps of: if a terminal participates in a plurality of direct communication scenarios, the terminal can feed back a plurality of measurement statistical information to the base station.
6. The method of claim 1, wherein the method comprises the steps of: the method for resource allocation in the direct communication scene comprises the following steps:
the data receiving end measures available direct connection communication resources, and sends resource information meeting quality requirements as candidate resource information to the data sending end in a random access preamble response message;
the data sending end measures available direct connection communication resources, screens candidate resources according to a measurement result, and sends screened resource information to the data receiving end in a data sending request message;
and the data receiving end sends the direct connection communication resources for data sending to the data sending end in the data sending request response message according to the resources screened by the data sending end.
7. The method of claim 1, wherein the method comprises the steps of: when the direct communication between terminals is realized in an LTE system, the direct communication resource is an LTE uplink time slot resource, and the carrier frequency is an LTE system uplink channel carrier frequency; wherein,
the data sending end performs the following operations:
a data sending end sends a random access preamble in a random access channel;
after the data sending end sends the random access preamble, the data sending end waits for a random access preamble response instruction in a window, the random access preamble response instruction is a PUCCH identified by RA-RNTI, and the size of the window is configured by an LTE system;
if the data sending end detects the random access preamble response indication in the waiting window, receiving the random access preamble response according to the PUSCH resource identified by the random access preamble response indication, or else, sending the random access preamble again after waiting a certain interval;
the data sending end carries the random access preamble response message according to the PUSCH identified by the random access preamble response indication, receives the random access preamble response data, and judges whether the following conditions are satisfied:
a. the data sending end successfully decodes the random access preamble response data packet;
b. the random access preamble identification is consistent with the random access preamble sent by the data sending end before;
c. the identity verification of the data receiving end is passed;
d. the data transmission resource distributed by the data receiving end meets the requirement;
e. the temporary identity distributed to the data sending end by the data receiving end meets the requirement;
if the condition is satisfied, the data sending end sends a data sending request message indication and a data sending request message in the PUSCH resource configuration indicated by the random access preamble response; if not, after a period of time, continuing to send the random access preamble;
after the data sending end sends the data sending request message, the data sending end waits for a PUCCH message indicated by the C-RNTI in a window, and the PUCCH message is a data sending request response indication; if a data sending request response instruction is received, receiving a data sending request response message according to the PUSCH resource mapping rule carried by the data sending request response instruction; if the data transmission request response indication is not received in the window, the random access preamble is transmitted again after a period of time;
the data sending end sends data according to the PUSCH resources and the time slot resources distributed by the data sending request response message;
the data receiving end comprises the following operations:
the data receiving end detects the random access preamble according to the random access preamble sending rule predefined by the LTE system;
after a data receiving end correctly detects the random access preamble, using RA-RNTI to mark a PUCCH, sending a random access preamble response instruction, and sending a random access preamble response message in a PUSCH channel marked by the response instruction;
after the data receiving end finishes sending the random access preamble response, detecting a data sending request indication of the data sending end in the window, if the data sending request indication of the data sending end is received, receiving the data sending request message according to PUSCH (physical uplink shared channel) information carried by the data sending request indication message of the data sending end, and sending the data sending request response to the data sending end according to the content of the data sending request message; otherwise, the flow is ended;
and the data receiving end receives the data sent by the data sending end on the allocated PUSCH channel resources.
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