CN107995605B - Mobile communication system and terminal direct unicast sending control method - Google Patents

Mobile communication system and terminal direct unicast sending control method Download PDF

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Publication number
CN107995605B
CN107995605B CN201610959546.9A CN201610959546A CN107995605B CN 107995605 B CN107995605 B CN 107995605B CN 201610959546 A CN201610959546 A CN 201610959546A CN 107995605 B CN107995605 B CN 107995605B
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terminal
identification
type
control signaling
signaling
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CN107995605A (en
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焦慧颖
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China Academy of Information and Communications Technology CAICT
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China Academy of Telecommunications Research CATR
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607Details of the supervisory signal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. van Duuren system ; ARQ protocols
    • H04L1/1806Go-back-N protocols
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057Physical resource allocation for CQI

Abstract

The application discloses a mobile communication system and a terminal direct unicast sending control method.A first terminal sends a first type of secondary link control signaling which comprises a first terminal identifier, a second terminal identifier, a resource allocation identifier and a modulation coding identifier; the second terminal receives the sidelink data signal and generates a channel quality indication and retransmission request information; the second terminal sends a second type of sidelink control signaling to the first terminal, wherein the second type of sidelink control signaling comprises a second terminal identification, a first terminal identification, a channel quality indication and retransmission request information; the first terminal receives the second type of sidelink control signaling, and identifies a second terminal identification, a first terminal identification, a channel quality indication and retransmission request information; and determining the modulation coding identification according to the channel quality indication, and sending the sidelink data signal again. The mobile communication system includes a base station and at least two terminals. Compared with the prior art, the invention ensures the transmission reliability, improves the data rate and improves the communication efficiency and the safety.

Description

Mobile communication system and terminal direct unicast sending control method
Technical Field
The present application relates to the field of mobile communications, and in particular, to a communication signaling control method and a mobile communication system for realizing unicast of terminal direct connection.
Background
The technology of direct terminal communication (D2D) of mobile communication can fully utilize direct communication between terminals with similar positions to replace communication between the terminals and a base station, reduces network load, and has been widely researched by a plurality of standardization organizations, including Bluetooth, IEEE802.11p, L TE D2D, L TE V2X and the like.
In the existing 4G system, the base station sends a broadcast Sidelink (Sidelink) control signaling (S L Grant) to the sending terminal through a dedicated physical control channel downlink control signaling, and the control signaling contains receiving user identifications, the receiving terminal may be a plurality of terminals, the sending terminal can only send one path of data, and broadcasts the used resources and format information through a Sidelink task scheduling signaling (S L SA), and at the receiving terminal, one terminal receives the straight-through data sent by a plurality of terminals, and judges whether the data is the data needing to be received or not through identifying the receiving user identifications in the Sidelink task scheduling signaling.
In the broadcast terminal direct connection system, the receiving terminal receives direct connection data transmitted by all other terminals, and therefore, the sidelink task scheduling signaling does not include information of the transmitting terminal. However, the existing terminal direct-connection sidelink control channel is sent by a resource pool mode, and reliability cannot be guaranteed, and on the other hand, when the existing terminal is direct-connection, a receiving terminal receives a sidelink task scheduling signaling, and cannot identify the sending terminal, so that the sending terminal cannot obtain the confirmation information of the receiving terminal. The D2D/V2X technology only uses a modulation and coding strategy of a common DPSK 1/3 coding rate, improves the reliability of information transmission by means of multiple retransmissions, and when the quality of a received signal deteriorates due to the influence of a channel state, a receiving terminal cannot notify a transmitting terminal that the transmitted sidelink signal is purposefully adjusted and optimized, so that the efficiency and reliability of sidelink signal transmission are low.
Disclosure of Invention
In the present invention, a mobile communication system and a terminal direct-connection unicast transmission control method are proposed to solve the problem of low reliability of the current sidelink signal transmission.
The embodiment of the application provides a direct unicast sending control method for a mobile communication terminal, which comprises the following steps:
a first terminal sends a first type of sidelink control signaling by using signaling resources, wherein the first type of sidelink control signaling comprises a first terminal identification, a second terminal identification, a resource allocation identification and a modulation coding identification;
the first terminal sends the sidelink data signal according to the resource allocation identification;
the second terminal receives the first type of secondary link control signaling according to the signaling resource, and identifies the first terminal identification, the second terminal identification, the resource allocation identification and the modulation coding identification;
the second terminal receives the sidelink data signal from the first terminal according to the resource allocation identification and the modulation coding identification, and generates a channel quality indication and a retransmission request;
the second terminal sends a second type of secondary link control signaling to the first terminal by using the signaling resource, wherein the second type of secondary link control signaling comprises a second terminal identifier, a first terminal identifier, a channel quality indicator and retransmission request information;
the first terminal receives the second type of sidelink control signaling according to the signaling resource, and identifies the second terminal identification, the first terminal identification, the channel quality indication and the retransmission request information;
the first terminal determines the modulation coding identification according to the channel quality indication;
and the first terminal retransmits the first type of the sidelink control signaling and the sidelink data signal according to the changed modulation coding identification.
As a preferred embodiment of the method of the present invention, the method for including the first terminal identifier in the first type of sidelink control signaling is to scramble the first type of sidelink control signaling with the first terminal identifier; the method for the second terminal to identify the first terminal identification is to descramble the first type of sidelink control signaling.
Similar to the above embodiment, the method for including the second terminal identifier in the second type of sidelink control signaling is to scramble the second type of sidelink control signaling with the second terminal identifier; and the method for the first terminal to identify the second terminal identification is to descramble the second type of sidelink control signaling.
As a further optimized embodiment of the present invention, before the first terminal sends the first type of sidelink control signaling to the second terminal, the base station sends a radio resource control signaling to the first terminal and the second terminal, where the radio resource control signaling includes a signaling resource pool and a data channel resource pool; the signaling resource pool comprises the signaling resources; the data channel resource pool contains the resources represented by the resource allocation identifications.
Preferably, the second terminal generates the channel quality indicator by measuring a demodulation reference signal to obtain channel state information. Preferably, the second terminal determines whether retransmission is required by calculating a received signal-to-noise ratio by demodulating the reference signal; determining whether retransmission is required according to the signal-to-noise ratio.
Preferably, the first type sidelink control signaling further includes a retransmission identifier. Preferably, the first type of sidelink control signaling further comprises a frequency hopping identifier and/or a timing advance identifier.
Preferably, the channel quality indicator is 4-bit data, representing 15 channel qualities supporting a spectral efficiency in the range of 0.15-5.55 bit/s/Hz. Preferably, the modulation coding scheme represented by the modulation coding identifier includes QPSK, 16QAM, and 64 QAM.
The embodiment of the present application further provides a mobile communication system, which includes at least one base station and at least two terminals, and is characterized in that the base station is configured to send a radio resource control signaling to the first terminal and the second terminal, where the radio resource control signaling includes a signaling resource pool and a data channel resource pool; the signaling resource pool comprises the signaling resources; the data channel resource pool contains the resources represented by the resource allocation identifications;
the first terminal is used for selecting the signaling resource from the signaling resource pool and sending a first type of sidelink control signaling which comprises a first terminal identification, a second terminal identification, a debugging coding identification and a resource allocation identification; sending a secondary link data signal, wherein the modulation coding mode of the secondary link data signal is determined by the modulation coding identifier, and the resource occupied by the secondary link data signal is determined by the resource allocation identifier; transmitting a demodulation reference signal, which is included in a time slot of the link data signal; receiving the second type of sidelink control signaling, and identifying the second terminal identification, the first terminal identification, the channel quality indication and the retransmission request information; determining the modulation coding identification according to the channel quality indication; if the retransmission request information is 'yes', the sidelink data signal is sent to the second terminal again;
the second terminal is used for receiving the first type of sidelink control signaling and identifying a first terminal identifier, a second terminal identifier, a debugging coding identifier and a resource allocation identifier; receiving the secondary link data signal according to the modulation coding identifier and the resource allocation identifier; calculating a receiving signal-to-noise ratio according to the demodulation reference signal, determining whether retransmission is needed or not, and generating retransmission request information; determining a channel state according to the demodulation reference signal, and generating a channel quality indicator; and sending a second type of sidelink control signaling, wherein the second type of sidelink control signaling comprises a second terminal identification, a first terminal identification, a channel quality indication and retransmission request information.
As a preferred embodiment of the mobile communication system of the present invention, the first terminal is further configured to scramble the first type sidelink control signaling by using the first terminal identifier, so that the first type sidelink control signaling includes the first terminal identifier; and the second terminal is also used for descrambling the first type of the secondary link control signaling and identifying the first terminal identification.
As a preferred embodiment of the mobile communication system of the present invention, the second terminal is further configured to scramble the second type sidelink control signaling by using the second terminal identifier, so that the second type sidelink control signaling includes the second type terminal identifier; and the first terminal is also used for descrambling the second type sidelink control signaling and identifying the second type terminal identification.
At least one technical scheme of the embodiment of the application can achieve the following beneficial effects: compared with the prior art, in the embodiment, in order to ensure the reliability and the data rate of unicast transmission, a retransmission request is introduced. Different modulation and coding modes can be selected according to the channel condition of the unicast link, so that the transmission reliability is ensured, and the data rate is improved. At least one technical scheme of the embodiment of the application can also achieve the following beneficial effects: the invention also replaces the scrambling code sequence of the sidelink control channel with the identification of the sending terminal, thus scrambling is carried out by adding the scrambling code identification of the sending terminal in the sidelink sending terminal, so that the receiving terminal can identify the identification of the sending terminal through descrambling, and the efficiency and the safety of communication are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a flowchart of an embodiment of a method for controlling direct unicast transmission of a mobile communication terminal according to the present invention;
figure 2 is a flow chart of an embodiment of the method of the present invention involving scrambling and descrambling;
fig. 3 is a schematic diagram of an embodiment of a system formed by a base station, a first terminal and a second terminal and a communication process thereof.
Detailed Description
The patent designs a control signaling for direct connection of mobile terminals or unicast communication of Internet of vehicles, and by the design of the control signaling, the unicast communication can be realized by using the secondary link resource of D2D/V2V. This patent first designs a sidelink control channel for D2D/V2V unicast communication, implementing a unicast communication function, which is different from broadcast multicast in that transmitting and receiving terminals can know each other's identification information, a unicast link can be used to measure a demodulation reference signal of a sidelink, obtain channel state information, and transmit a Channel Quality Indication (CQI) in newly designed sidelink control signaling so that the transmitting terminal selects a corresponding Modulation Coding Scheme (MCS) level. The newly designed sidelink control signaling can also carry out retransmission request information according to the link condition, determine whether to retransmit or not, and if so, determine the retransmission times.
In order to make the objects, technical solutions and advantages of the present application more clear, the following description of the present application will be made in detail and completely with reference to the embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
Fig. 1 is a flowchart of an embodiment of a method for controlling direct connection and unicast transmission of a mobile communication terminal, which specifically includes the following steps:
step 11, the first terminal uses signaling resources to send a first type of sidelink control signaling, wherein the first type of sidelink control signaling comprises a first terminal identification, a second terminal identification, a resource allocation identification and a modulation coding identification;
step 12, the first terminal sends the sidelink data signal according to the resource allocation identification;
step 13, the second terminal receives the first type of sidelink control signaling according to the signaling resource, and identifies the first terminal identification, the second terminal identification, the resource allocation identification and the modulation coding identification;
step 14, the second terminal receives the sidelink data signal from the first terminal according to the resource allocation identifier and the modulation coding identifier, generates a channel quality indicator, determines whether the sidelink data signal needs to be retransmitted, and generates retransmission request information;
step 15, the second terminal uses the signaling resource to send a second type of sidelink control signaling to the first terminal, wherein the second type of sidelink control signaling comprises a second terminal identification, a first terminal identification, a channel quality indication and retransmission request information;
step 16, the first terminal receives the second type of sidelink control signaling according to the signaling resource, and identifies the second terminal identification, the first terminal identification, the channel quality indication and the retransmission request information;
step 17, if the retransmission request information is "yes", the first terminal determines the modulation coding identifier according to the channel quality indication; and returning to step 11, the first terminal resends the first type of sidelink control signaling and the sidelink data signal according to the changed modulation coding identifier.
Example two
This embodiment further optimizes information included in the first type of sidelink control signaling according to the embodiment of the present invention, and exemplifies the information.
The first type of sidelink control signaling is used to schedule a sidelink data signal channel, such as a psch (phaseld shared channel), and the specific information included therein is shown in table 1.
TABLE 1 information contained in the first type of sidelink control signaling
In table 1, the second terminal identifier: an identifier for indicating a target terminal that receives the data; resource allocation identification: a resource block location for indicating transmission of the secondary link data signal, wherein N represents a number of Resource Blocks (RBs) used by the secondary link for transmitting information; modulation coding identification: a modulation and coding mode for indicating the transmission of the sidelink data signal; and (4) retransmission identification: for indicating whether the data transmitted this time is new data or retransmission data; frequency hopping identification: for indicating whether the allocated data is frequency hopped; timing advance identification: for transmit time adjustment.
It should be noted that the number of bits occupied by the partial information is listed in table 1, which is only an example.
It should be further noted that, if the first terminal identifier is used to scramble the first type of sidelink control signaling, it can also be understood that the first type of sidelink control signaling includes the first terminal identifier, but at this time, the first terminal identifier does not occupy bytes of the first type of sidelink control signaling.
EXAMPLE III
This embodiment further optimizes and exemplifies information included in the second type sidelink control signaling.
This patent defines a second type of sidelink control signaling for providing channel quality indication and retransmission request information to a received sidelink data signal path.
Preferably, the second terminal generates the channel quality indicator by measuring a demodulation reference signal to obtain channel state information. It should be noted here that the channel state information reflects the magnitude of the impact of the channel on the signal degradation, and the channel quality indicator is a hierarchical indicator.
Preferably, the second terminal determines whether retransmission is required by calculating a received signal-to-noise ratio by demodulating the reference signal; determining whether retransmission is required based on the signal-to-noise ratio and a tolerance of a receiver. It should be noted here that when the snr satisfies the receiver tolerance, the bit error rate (or packet loss rate) is low, and retransmission is not needed.
The information contained in the second type of sidelink control signaling is shown in table 2.
TABLE 2 information contained in Secondary Link control Signaling of second class
Information Number of bits (bit)
Second terminal identification
First terminal markSign board 8
Channel Quality Indication (CQI) 4
Retransmission request information (ACK/NACK) 1
The contents of sidelink measurement and feedback include:
a second terminal identification: and sending the identifier of the terminal of the second type of sidelink control signaling.
A first terminal identification: and the identifier is used for indicating the terminal receiving the second type of sidelink control signaling.
The channel quality indicator indicates the quality of the wireless channel and is used for adaptively selecting an appropriate modulation and coding scheme. To enable CQI feedback, the second terminal measures the quality of the secondary link data signal, here using a demodulation reference signal (e.g., DM RS pilot) on the secondary link data signal channel.
The retransmission request information is generated and transmitted with a predefined fixed retransmission time interval, e.g., 4ms after the transmission of the sidelink data signal.
It should be noted that the number of bits occupied by the partial information is listed in table 2, which is only an example. For example, when the channel quality indicator is 4 bits, it can be used to select the modulation and coding strategy level, and the other 15 combinations represent 15 channel qualities supporting a spectrum efficiency in the range of 0.15-5.55 bits/s/Hz. Retransmission request information 1bit, 0 stands for "No (NACK)", and 1 stands for "yes (ACK)".
It should be further noted that, if the second type of sidelink control signaling is scrambled by using a second terminal identifier, it can also be understood that the second type of sidelink control signaling contains the second terminal identifier, but at this time, the second terminal identifier does not occupy bytes of the second type of sidelink control signaling.
Compared with the prior art, in the embodiment, in order to ensure the reliability and the data rate of unicast transmission, a retransmission request is introduced. Different modulation and coding strategies can be selected according to the channel condition of the unicast link, so that the transmission reliability is ensured, and the data rate is improved. And the D2D/V2V of the prior art only uses the modulation coding strategy of the fixed QPSK 1/3 coding rate and uses multiple retransmission to improve the reliability of information transmission. In addition, the prior art D2D/V2V does not implement automatic retransmission request, that is, does not adjust the number of retransmissions according to the channel state information, but adopts a fixed number of retransmissions.
Example four
And according to the embodiment of determining the modulation coding mode through the channel quality indication, the first terminal receives the second type of sidelink control signaling, identifies the channel quality indication therein, and selects the corresponding modulation coding mode according to the CQI value.
Table 3, 4bit CQI value table
EXAMPLE five
In the prior art, the sidelink control signaling contains the identification of the receiving terminal, so that the receiving terminal can identify whether the received information is the information that the receiving terminal should receive, but the receiving terminal cannot identify the sending terminal through the sidelink control signaling. When the transmitting terminal transmits the secondary link control signaling, a secondary link control channel (PSCCH) is used as the reference cinitThe scrambling code generates a sequence 510. The invention replaces the scrambling sequence of the sidelink control channel with the identity of the transmitting terminal (e.g., c)initC-RNTI), which is scrambled by adding a scrambling code identity of the transmitting terminal at the secondary link transmitting end, so that the receiving terminal can identify the identity of the transmitting terminal through descrambling.
Fig. 2 is a flow chart of an embodiment of the method of the present invention involving scrambling and descrambling. The embodiment comprising scrambling and descrambling comprises the following specific steps,
step 21, the first terminal uses signaling resources to send a first type of sidelink control signaling, wherein the first type of sidelink control signaling comprises a first terminal identification, a second terminal identification, a resource allocation identification and a modulation coding identification; the method for the first type of secondary link control signaling to contain the first terminal identification is to scramble the first type of secondary link control signaling by using the first terminal identification;
step 22, the first terminal sends the sidelink data signal according to the resource allocation identification;
step 23, the second terminal receives the first type of sidelink control signaling according to the signaling resource, and identifies the first terminal identification, the second terminal identification, the resource allocation identification and the modulation coding identification; the method for the second terminal to identify the first terminal identification is to descramble the first type of sidelink control signaling.
Step 24, the second terminal receives the sidelink data signal from the first terminal according to the resource allocation identifier and the modulation coding identifier, generates a channel quality indicator, and determines whether the sidelink data signal needs to be retransmitted;
step 25, the second terminal sends a second type of sidelink control signaling to the first terminal by using the signaling resource, wherein the second type of sidelink control signaling comprises a second terminal identification, a first terminal identification, a channel quality indication and retransmission request information; the method for the second type of sidelink control signaling containing the second terminal identification is that the second terminal identification is used for scrambling the second type of sidelink control signaling;
step 26, the first terminal receives the second type sidelink control signaling according to the signaling resource, and identifies the second terminal identification, the first terminal identification, the channel quality indication and the retransmission request information; and the method for the first terminal to identify the second terminal identification is to descramble the second type of sidelink control signaling.
Step 27, the first terminal determines the modulation coding identifier according to the channel quality indicator; and returning to step 21, the first terminal resends the first type of sidelink control signaling and the sidelink data signal according to the changed modulation coding identifier.
EXAMPLE six
Fig. 3 is an embodiment of a system formed by a base station and a first terminal and a second terminal and a communication process thereof.
The system of the invention comprises at least one base station and at least two terminals.
The base station is configured to send a Radio Resource Control (RRC) signaling to the first terminal and the second terminal, where the RRC signaling includes a signaling Resource pool and a data channel Resource pool; the signaling resource pool comprises the signaling resources; the data channel resource pool contains the resources represented by the resource allocation identifications.
The first terminal is configured to: selecting the signaling resource from the signaling resource pool, and sending a first type of sidelink control signaling, wherein the first type of sidelink control signaling comprises the first terminal identification, the second terminal identification, the debugging coding identification and the resource allocation identification;
the first terminal is further configured to: sending a secondary link data signal, wherein the modulation coding mode of the secondary link data signal is determined by the modulation coding identifier, and the resource occupied by the secondary link data signal is determined by the resource allocation identifier;
the first terminal is further configured to: transmitting a demodulation reference signal, which is included in a time slot of the link data signal;
the first terminal is further configured to receive the second-type sidelink control signaling, and identify the second terminal identifier, the first terminal identifier, the channel quality indicator, and the retransmission request information; determining the modulation coding identification according to the channel quality indication; and if the retransmission request information is 'yes', the secondary link data signal is sent to the second terminal again.
The second terminal is configured to: receiving the first type of sidelink control signaling, and identifying a first terminal identifier, a second terminal identifier, a debugging coding identifier and a resource allocation identifier; receiving the secondary link data signal according to the modulation coding identifier and the resource allocation identifier; calculating a received signal-to-noise ratio (SINR) according to the demodulation reference signal, determining whether retransmission is needed, and generating retransmission request information; determining a channel state according to the demodulation reference signal, and generating a channel quality indicator; and sending a second type of sidelink control signaling, wherein the second type of sidelink control signaling comprises a second terminal identification, a first terminal identification, a channel quality indication and retransmission request information.
As a preferred embodiment of the system of the present invention, when the first terminal sends the first type of sidelink control signaling to the second terminal, the first terminal is further configured to: scrambling the first type of secondary link control signaling by using the first terminal identification to enable the first type of secondary link control signaling to contain the first terminal identification; correspondingly, the second terminal is further configured to: and descrambling the first type of secondary link control signaling and identifying the first terminal identification.
Similarly to the foregoing embodiment, when the second terminal sends the second type sidelink control signaling to the first terminal, the second terminal is further configured to scramble the second type sidelink control signaling by using the second terminal identifier, so that the second type sidelink control signaling includes the second type terminal identifier; correspondingly, the first terminal is further configured to: and descrambling the second type sidelink control signaling, and identifying the second type terminal identification.
EXAMPLE seven
Corresponding to the above system embodiment, the flow of the best embodiment of the direct unicast transmission control method of the mobile communication terminal of the present invention is as follows:
step 30, the base station sends a radio resource control signaling to the first terminal and the second terminal, wherein the radio resource control signaling comprises a signaling resource pool and a data channel resource pool; the signaling resource pool comprises the signaling resources; the data channel resource pool contains the resources represented by the resource allocation identifications.
Step 31, the first terminal uses the signaling resource to send a first type of sidelink control signaling, wherein the first type of sidelink control signaling comprises a second terminal identification, a resource allocation identification and a modulation coding identification; scrambling the first type sidelink control signaling by using the first terminal identification;
step 32, the first terminal sends the sidelink data signal according to the resource allocation identification and the modulation coding identification; the modulation coding mode of the secondary link data signal is determined by the modulation coding identifier, and the resource occupied by the secondary link data signal is determined by the resource allocation identifier; the first terminal further transmits a demodulation reference signal, which is contained in a time slot of the link data signal;
step 33, the second terminal receives the first type of sidelink control signaling according to the signaling resource; descrambling the first type of secondary link control signaling and identifying the first terminal identification; then identifying the second terminal identification, the resource allocation identification and the modulation coding identification;
step 34, the second terminal receives the sidelink data signal from the first terminal according to the resource allocation identifier and the modulation coding identifier, calculates a received signal-to-noise ratio (SINR) according to the demodulation reference signal, determines whether retransmission is required, and generates retransmission request information; determining a channel state according to the demodulation reference signal, and generating a channel quality indicator;
step 35, the second terminal sends a second type of sidelink control signaling to the first terminal by using the signaling resource, and scrambles the second type of sidelink control signaling by using the second terminal identifier; the second type of sidelink control signaling also comprises a first terminal identification, a channel quality indication and retransmission request information;
step 36, the first terminal receives the second type of sidelink control signaling according to the signaling resource, descrambles the second type of sidelink control signaling, and identifies the second terminal identifier; further identifying a first terminal identifier, a channel quality indicator and retransmission request information;
step 37, the first terminal determines the modulation coding identifier according to the channel quality indicator; if the retransmission request information is "yes", returning to step 31, the first terminal resends the first type of sidelink control signaling and the sidelink data signal according to the changed modulation coding identifier.
At least one embodiment of the present invention has the following advantageous effects: compared with the prior art, in the embodiment, in order to ensure the reliability and the data rate of unicast transmission, a retransmission request is introduced. Different modulation and coding modes can be selected according to the channel condition of the unicast link, so that the transmission reliability is ensured, and the data rate is improved. In the prior art, only a fixed modulation and coding strategy and blind retransmission are used, and the retransmission times and the modulation and coding mode cannot be adjusted according to the channel state information.
At least one embodiment of the invention also has the following beneficial effects: the invention replaces the scrambling code sequence of the sidelink control channel with the identification of the sending terminal, thus scrambling is carried out by adding the scrambling code identification of the sending terminal in the sidelink sending terminal, so that the receiving terminal can identify the identification of the sending terminal through descrambling, and the efficiency and the safety of communication are improved. In the sidelink control signaling of the prior art, however, the receiving terminal cannot identify the transmitting terminal through the sidelink control signaling.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (13)

1. A direct-connection unicast transmission control method for a mobile communication terminal,
a first terminal sends a first type of sidelink control signaling by using signaling resources, wherein the first type of sidelink control signaling comprises a first terminal identification, a second terminal identification, a resource allocation identification and a modulation coding identification;
the first terminal sends the sidelink data signal according to the resource allocation identification;
the second terminal receives the first type of secondary link control signaling according to the signaling resource, and identifies the first terminal identification, the second terminal identification, the resource allocation identification and the modulation coding identification;
the second terminal receives the sidelink data signal from the first terminal according to the resource allocation identification and the modulation coding identification, and generates a channel quality indication and a retransmission request;
the second terminal sends a second type of secondary link control signaling to the first terminal by using the signaling resource, wherein the second type of secondary link control signaling comprises a second terminal identifier, a first terminal identifier, a channel quality indicator and retransmission request information;
the first terminal receives the second type of sidelink control signaling according to the signaling resource, and identifies the second terminal identification, the first terminal identification, the channel quality indication and the retransmission request information;
the first terminal determines the modulation coding identification according to the channel quality indication;
and the first terminal retransmits the first type of the sidelink control signaling and the sidelink data signal according to the changed modulation coding identification.
2. The mobile communication terminal through unicast transmission control method according to claim 1,
the method for the first type of secondary link control signaling to contain the first terminal identification is to scramble the first type of secondary link control signaling by using the first terminal identification;
the method for the second terminal to identify the first terminal identification is to descramble the first type of sidelink control signaling.
3. The mobile communication terminal through unicast transmission control method according to claim 1,
the method for the second type of sidelink control signaling containing the second terminal identification is that the second terminal identification is used for scrambling the second type of sidelink control signaling;
and the method for the first terminal to identify the second terminal identification is to descramble the second type of sidelink control signaling.
4. The method for controlling through unicast transmission of mobile communication terminal according to any of claims 1 to 3,
a base station sends a wireless resource control signaling to the first terminal and the second terminal, wherein the wireless resource control signaling comprises a signaling resource pool and a data channel resource pool;
the signaling resource pool comprises the signaling resources;
the data channel resource pool contains the resources represented by the resource allocation identifications.
5. The method for controlling through unicast transmission of mobile communication terminal according to any of claims 1 to 3,
the second terminal generates the channel quality indicator by measuring a demodulation reference signal to obtain channel state information.
6. The method for controlling through unicast transmission of mobile communication terminal according to any of claims 1 to 3,
the second terminal determines whether retransmission is required or not by calculating a received signal-to-noise ratio by demodulating the reference signal; determining whether retransmission is required according to the signal-to-noise ratio.
7. The method for controlling through unicast transmission of mobile communication terminal according to any of claims 1 to 3,
the first type of sidelink control signaling comprises retransmission identification.
8. The method for controlling through unicast transmission of mobile communication terminal according to any of claims 1 to 3,
the first type of sidelink control signaling comprises a frequency hopping identification and/or a timing advance identification.
9. The method for controlling through unicast transmission of mobile communication terminal according to any of claims 1 to 3,
the channel quality indicator is 4-bit data and represents 15 kinds of channel quality supporting the spectral efficiency within the range of 0.15-5.55 bit/s/Hz.
10. The method for controlling through unicast transmission of mobile communication terminal according to any of claims 1 to 3,
the modulation coding mode represented by the modulation coding identifier comprises QPSK, 16QAM and 64 QAM.
11. A mobile communication system comprising at least one base station and at least two terminals,
the base station is used for sending a wireless resource control signaling to the first terminal and the second terminal, and comprises a signaling resource pool and a data channel resource pool; the signaling resource pool comprises the signaling resources; the data channel resource pool comprises resources represented by resource allocation identifications;
the first terminal is configured to:
selecting the signaling resource from the signaling resource pool, and sending a first type of sidelink control signaling which comprises a first terminal identification, a second terminal identification, a debugging coding identification and a resource allocation identification;
sending a secondary link data signal, wherein the modulation coding mode of the secondary link data signal is determined by the modulation coding identifier, and the resource occupied by the secondary link data signal is determined by the resource allocation identifier;
transmitting a demodulation reference signal, which is included in a time slot of the link data signal;
receiving a second type of sidelink control signaling, and identifying the second terminal identification, the first terminal identification, the channel quality indication and the retransmission request information; determining the modulation coding identification according to the channel quality indication; if the retransmission request information is 'yes', the sidelink data signal is sent to the second terminal again;
the second terminal is configured to:
receiving the first type of sidelink control signaling, and identifying the first terminal identification, the second terminal identification, the debugging coding identification and the resource allocation identification; receiving the secondary link data signal according to the modulation coding identifier and the resource allocation identifier; calculating a receiving signal-to-noise ratio according to the demodulation reference signal, determining whether retransmission is needed or not, and generating retransmission request information; determining a channel state according to the demodulation reference signal, and generating a channel quality indicator;
and sending the second type of sidelink control signaling, wherein the second type of sidelink control signaling comprises a second terminal identification, a first terminal identification, a channel quality indication and retransmission request information.
12. The mobile communication system of claim 11,
the first terminal is further configured to:
scrambling the first type of secondary link control signaling by using the first terminal identification to enable the first type of secondary link control signaling to contain the first terminal identification;
the second terminal is further configured to:
and descrambling the first type of secondary link control signaling and identifying the first terminal identification.
13. The mobile communication system of claim 11,
the second terminal is further configured to:
scrambling the second type sidelink control signaling by using the second terminal identification to enable the second type sidelink control signaling to contain the second type terminal identification;
the first terminal is further configured to:
and descrambling the second type sidelink control signaling, and identifying the second type terminal identification.
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