CN112713980A - Internet of vehicles communication transmission control method - Google Patents
Internet of vehicles communication transmission control method Download PDFInfo
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- CN112713980A CN112713980A CN202011412347.9A CN202011412347A CN112713980A CN 112713980 A CN112713980 A CN 112713980A CN 202011412347 A CN202011412347 A CN 202011412347A CN 112713980 A CN112713980 A CN 112713980A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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Abstract
The invention provides a communication transmission control method for Internet of vehicles, which comprises the following steps: determining a first set of time-frequency resources to transmit a first set of downlink control channels for a plurality of V2X terminals, wherein the first set of time-frequency resources includes at least one broadcast resource designated for an enhanced downlink control channel; mapping a first interval of a downlink control channel to the first set of time-frequency resources; and assigning a second set of time frequency resources for a second interval of the downlink control channel, wherein the second interval is dedicated to a terminal-specific search space, and consecutive available time frequency resources of the first interval of the downlink control channel are allocated for the terminal-specific search space and a common search space in the downlink control channel. The invention provides a communication transmission control method of an internet of vehicles, which carries out self-adaptive adjustment on a channel according to a complex and changeable environment of the internet of vehicles, thereby reducing communication time delay and improving the reliability of the whole internet of vehicles system.
Description
Technical Field
The invention relates to a vehicle networking, in particular to a communication transmission control method of the vehicle networking.
Background
The V2X is used as an important key technology for realizing environment perception, information interaction and cooperative control in the Internet of vehicles, so that the V2V, the V2R, the V2P and the V2I can be interactively communicated, and a series of traffic information such as real-time road conditions, road information, pedestrian information and the like is obtained, thereby improving driving safety, reducing congestion and improving traffic efficiency. With the continuous development of V2X technology, especially autonomous vehicles, higher requirements are placed on the communication delay of real-time data. Meanwhile, the requirements of ultra-low delay and high reliability in 5G scenes also put higher requirements on air interface delay of data transmission, and generally the requirement is controlled within 10 ms. However, in the existing LTE-based car networking solution, the implemented communication delay is generally more than 50 ms. This presents a significant challenge to the safe driving of autonomous vehicles in high-speed moving scenarios.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a vehicle networking communication transmission control method, which comprises the following steps:
determining a first set of time-frequency resources to transmit a first set of downlink control channels for a plurality of V2X terminals, wherein the first set of time-frequency resources are resources known to the plurality of V2X terminals, and wherein the first set of time-frequency resources change from a first time interval to a second time interval, wherein the first set of time-frequency resources includes at least one broadcast resource designated for enhanced downlink control channels;
mapping a first interval of the downlink control channel to the first set of time-frequency resources; and
assigning a second set of time-frequency resources for a second interval of the downlink control channel, wherein the second interval is dedicated to a terminal-specific search space, and wherein continuously available time-frequency resources of the first interval of the downlink control channel are allocated for the terminal-specific search space and a common search space in the downlink control channel.
Preferably, in the first interval of the downlink control channel, the downlink control information downloads information associated with temporary authentication of the radio frequency network.
Preferably, wherein the first section of the downlink control channel downloads information specific to a single V2X terminal.
Preferably, independent time-frequency resource blocks are allocated to the first time-frequency resource set and the second time-frequency resource set, so that a time-frequency resource component of the first interval of the downlink control channel and a time-frequency resource component of the second interval of the downlink control channel do not overlap.
Preferably, the downlink control information of the first section of the downlink control channel is downloaded with the same scheduling information as the scheduling information downloaded from the control region in the downlink control channel of the same subframe for a plurality of V2X terminals, wherein the downlink control information is transmitted with its CRC bits, which are scrambled by the radio frequency network temporary authentication.
Compared with the prior art, the invention has the following advantages:
the invention provides a communication transmission control method of an internet of vehicles, which carries out self-adaptive adjustment on a channel according to a complex and changeable environment of the internet of vehicles, thereby reducing communication time delay and improving the reliability of the whole internet of vehicles system.
Drawings
Fig. 1 is a flowchart of a vehicle networking communication transmission control method according to an embodiment of the present invention.
Detailed Description
A detailed description of one or more embodiments of the invention is provided below along with accompanying figures that illustrate the principles of the invention. The invention is described in connection with such embodiments, but the invention is not limited to any embodiment. The scope of the invention is limited only by the claims and the invention encompasses numerous alternatives, modifications and equivalents. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. These details are provided for the purpose of example and the invention may be practiced according to the claims without some or all of these specific details.
The invention provides a vehicle networking communication transmission control method. Fig. 1 is a flowchart of a vehicle networking communication transmission control method according to an embodiment of the present invention.
The present invention transmits downlink control channels for a plurality of V2X terminals by determining a set of time-frequency resources known to the plurality of V2X terminals, and wherein the first set of time-frequency resources changes from a first time interval to a second time interval, wherein the first set of time-frequency resources contains broadcast resources designated for enhanced downlink control channels; mapping a first interval of the downlink control channel to the time frequency resource set; and designating another set of time frequency resources for a second interval of the downlink control channel, the second interval being dedicated to the terminal-specific search space, and wherein continuously available time frequency resources of the first interval of the downlink control channel are allocated for the terminal-specific search space and the common search space in the downlink control channel.
In a first interval of the downlink control channel, the downlink control information downloads information associated with temporary authentication of the radio frequency network. The first segment of the downlink control channel downloads information specific to a single V2X terminal. Independent time frequency resource blocks are distributed to each time frequency resource set, so that the time frequency resource component in the first interval of the downlink control channel is not overlapped with the time frequency resource component in the second interval of the downlink control channel. The downlink control information of the first section of the downlink control channel, which is transmitted together with the CRC bits that it is temporarily authenticated by the radio frequency network to be scrambled, is downloaded with the same scheduling information as the scheduling information downloaded from the control region in the downlink control channel of the same subframe for a plurality of V2X terminals.
A downlink control channel is used to download data scheduling information of downlink DL or uplink UL from the gNB to a plurality of V2X terminals. The scheduling information may include: resource allocation, coding rate or transport block size, IDs of multiple target V2X terminals, and other information. Depending on the content of the scheduled data, the downlink control channel may be used for a single V2X terminal or multiple V2X terminals in a cell. The broadcast downlink control channel received by all V2X terminals in the cell is used to download scheduling information for the physical downlink shared channel, e.g., the physical downlink shared channel that downloads system information about the gNB. The multicast downlink control channel is received by a set of V2X terminals in the cell. The unicast downlink control channel received by only a single V2X terminal is used for downloading the scheduling information of the physical downlink shared channel.
Each transmission subframe of the present invention may include a plurality of OFDM symbols in the time domain and a plurality of subcarriers in the frequency domain. The OFDM symbols in time and the subcarriers in frequency define a time-frequency resource component in common.
It is first necessary to set OFDM symbols in the subframe in the control channel section. The OFDM symbol includes an asynchronous HARQ identifier, a control format identifier channel, and a downlink control channel. The asynchronous HARQ identifier channel is used to transmit an asynchronous HARQ acknowledgement indicating whether the gbb correctly received the uplink scheduling data in the physical uplink shared channel.
The exact number of OFDM symbols is dynamically represented by a control format identifier CFI in the control format identifier channel. Alternatively, the number of OFDM symbols may be configured when cross-carrier scheduling is configured.
And transmitting a physical downlink shared channel, a physical broadcast channel, a main synchronous channel and a channel state reference signal in the physical downlink shared channel interval. DL user data is downloaded by a physical downlink shared channel scheduled in a physical downlink shared channel interval. And transmitting the reference signal for the cell through the control channel interval and the physical downlink shared channel interval.
A time-frequency resource block is defined as consecutive subcarriers in the frequency domain and all OFDM symbols of a slot in the time domain. The time-frequency resource block is used to map a particular physical channel to the smallest unit of the time-frequency resource component. Sets of time-frequency resource blocks having the same time-frequency resource block index in the first slot and the second slot of the subframe may be allocated together. Within each slot, a resource grid is defined for each antenna port, i.e. each antenna port has its own separate resource grid. Each time-frequency resource component of the resource grid of an antenna port is uniquely identified by a subcarrier of a slot and an index pair of an OFDM symbol.
Multiple downlink control channels may support UL and DL data scheduling for V2X terminals in the control interval of the subframe. And for a specific system bandwidth, determining the number of the downlink control channels supported in the control interval according to the aggregation level used by each downlink control channel. The aggregation level indicates the number of channel components aggregated to download the downlink control channel. The aggregation level for the predefined target encapsulation error rate is determined by the received signal quality of the downlink at the V2X terminal and by the size of the downlink control information downloaded by the downlink control channel. Preferably, a higher aggregation level is required for downlink control channels targeted for V2X terminals at the cell edge and far away from the gNB.
The method for enhancing the capacity of the downlink control channel comprises the step of transmitting dynamic scheduling information in a traditional physical downlink shared channel interval. I.e. some sets of time-frequency resource blocks of the conventional physical downlink shared channel interval are reserved for transmitting downlink control information to the V2X terminal.
The conventional downlink control channel interval may be present in a subframe having the downlink control channel interval. The time frequency resource of the downlink control channel interval is configurable. In the case of introducing a downlink control channel, the present invention dynamically indicates, for an asynchronous HARQ identifier channel and a control format identifier channel, the downlink control channel resource allocation of a subframe having the control format identifier channel, i.e., notifies the V2X terminal of the presence of the control format identifier channel, specifies and notifies the V2X terminal of the location of the control format identifier channel, multiplexes the control format identifier channel with the downlink control channel and a physical downlink shared channel, and determines the information content downloaded by the control format identifier channel. And defining a common search space between downlink control channels, and considering inter-cell disturbance management for a control format identifier channel, an asynchronous HARQ identifier channel, and the common search space of the downlink control channels. Finally, the response resource of the uplink control channel corresponding to the uplink grant transmitted by the downlink control channel needs to be determined.
In case of introducing an enhanced control channel into the data region, another set of common search space and terminal-specific search space is defined for the downlink control channel. The V2X terminal expects to listen to a combination of the common search space and the terminal specific search space. Since the common search space is shared by a plurality of V2X terminals, the common search space is stored in a predefined common resource area. In the common resource region, other downlink channels, such as a control format identifier channel and an asynchronous HARQ identifier channel, may be multiplexed.
Optionally, the demodulation reference signal may also be redefined for the downlink control channel and the HARQ identifier channel. The reference symbols for cross-interleaving the downlink control channel interval are obtained by a plurality of V2X terminals.
In one embodiment, the HARQ response signals of multiple V2X terminals are multiplexed by the same time-frequency resource. And the same time frequency resource and data transmission frequency division multiplexing. Notifying configuration information about the time-frequency resources to the plurality of V2X terminals before transmitting HARQ response signals.
In particular, resources for HARQ identifier channel transmission may be contiguous with the demodulation reference signal interface allocation for more accurate channel estimation. The set of time-frequency resource components of the HARQ identifier channel may be defined by consecutive time-frequency resource components of the same OFDM symbol or by adjacent time-frequency resource components of two consecutive OFDM symbols.
In one embodiment, the cross-interleaving operation supports a common search space in the downlink control channel interval. Downlink control information with CRC scrambled by the radio frequency network temporary authentication is transmitted in the legacy downlink control channel as well as in the downlink control channel. The downlink control information having the CRC temporarily authenticated and scrambled by the radio frequency network is transmitted through a legacy downlink control channel for a legacy V2X terminal and through a common search space of a downlink control channel section of a V2X terminal.
For a subframe having a legacy control region, the common search space for the downlink control channel may be contiguous to the legacy control region. The number of OFDM symbols of the legacy control region is represented by a control channel identifier downloaded by the control format identifier channel. Thus, the common search space may start with OFDM symbol k, CFI for system bandwidths k greater than 10 time-frequency resource blocks and CFI +1 for other system bandwidths k (if the OFDM symbol index of the subframe starts with 0). Optionally, the common search space always starts from a predefined OFDM symbol.
Both the common search space and the terminal-specific search space are defined in the downlink control channel. There are a number of options to define resources for a common search space versus a terminal-specific search space. In all options, the resources for the common search space of the downlink control channel interval are predefined and known. In a first option, resources for a common search space for downlink control channels do not overlap with resources for a terminal-specific search space. In other words, separate resources, i.e., time-frequency resource blocks, may be allocated for the common search space and the terminal-specific search space. At this time, two downlink control channel intervals are defined, and the V2X terminal searches each interval for common downlink control information and V2X terminal-specific downlink control information. In this option, there are two downlink control channels in the subframe, one having broadcast transmission, i.e., the downlink control channel occupies discontinuous resources, and the downlink control channels of multiple V2X terminals are multiplexed and transmitted from the same group of time-frequency resource block set, at this time, the downlink control information is interleaved; and the other transmission mode has local transmission, namely the downlink control channel of the V2X terminal occupies continuous resources in the downlink control channel interval, and the downlink control information is not interleaved. The broadcast transmission interval is uniquely used for a common search space, where a plurality of downlink control information can be cross-interleaved. The time-frequency resource blocks for the broadcast transmission interval may be predefined or signaled through a control format identifier channel. The terminal-specific search space is uniquely located in the local transmission region. Different downlink control information of the terminal-specific search space is multiplexed in time-frequency resource block level or sub-block level according to the multiplexing manner for the downlink control information. Thereby simplifying the detection of V2X terminal-specific downlink control information.
In a second option, resources of a common search space for downlink control channels may overlap with resources for a terminal-specific search space. I.e. a single downlink control channel interval is defined for both search space types. A downlink control channel interval with broadcast transmission exists in the subframe. The interval may be predefined or signaled through a control format identifier channel. All downlink control information is cross-interleaved. At this time, the common search space may occupy a known subset of the total resources, and the resources for the common search space may also overlap with the terminal-specific search space. This option may result in better resource utilization for the common search space.
In a third option, there may be two downlink control channel intervals in the subframe. One downlink control channel interval is used for local transmission, which is uniquely used for the terminal-specific search space. Another downlink control channel interval is a broadcast interval shared by both the common search space and the terminal-specific search space. The V2X terminal may be configured to search in an interval for V2X terminal-specific downlink control information and common downlink control information. There is better resource utilization when there is a resource allocation to the common search space than the first and second options.
If the conventional downlink control channel interval and the downlink control channel common search space exist at the same time, it may be necessary to determine whether the V2X terminal should search for the common information scrambled by the temporary authentication of the radio frequency network. Since the radio network temporary authentication is shared between the conventional V2X terminal and the V2X terminal, common information is transmitted through the conventional downlink control channel interval. If the V2X terminal cannot detect the conventional downlink control channel interval, the common information may be repeated in the downlink control channel common search space. Only the physical downlink shared channel for downloading the predefined system information is transmitted in the subframe.
For the temporary authentication of the radio network, the invention is divided into a plurality of scenarios considering that there may be more V2X terminals that need to be notified. In a first scenario, some V2X terminals may be configured to receive common information only in the conventional downlink control channel interval. In a second scenario, some V2X terminals may be configured to receive common information only in the downlink control channel common search space. In a third scenario, some V2X terminals may be configured to receive common information in the common search space of a legacy downlink control channel or in the common search space of a downlink control channel. For example, if the common search space of the downlink control channel is not configured, the V2X terminal may search the common search space of the conventional downlink control channel section. Otherwise, the V2X terminal may search the common search space of the downlink control channel interval.
In one embodiment, the common search space is always present within the downlink control channel interval, so the skip notification indicates that the common search space is detected through the downlink control channel. Otherwise, configuring whether to detect the common search space of the downlink control channel through RRC notification. That is, the V2X terminal informs whether to perform a search in the common search space between downlink control channel intervals in an RRC manner through a conventional downlink control channel.
For a V2X terminal that cannot detect downlink control information in a conventional downlink control channel interval, there are a common search space and a terminal-specific search space in the subframe. Preferably, the set of time-frequency resource blocks for the common search space is dynamically represented or predefined by a control format identifier channel. Resources within the set of time-frequency resource blocks for a common search space may be predefined. Optionally, the set of time-frequency resource blocks for the terminal-specific search space is different from the set of time-frequency resource blocks for the common search space.
Wherein a single antenna transmission or a subset of transmissions may also be configured for a common search space. The number of antennas used for common search space transmission may be derived from the physical broadcast channel. Or, if the number of antennas is different from the number of antennas used by the conventional downlink control channel, the configuration is performed by the RRC. Thereby it may be omitted to inform the V2X terminal which transmission mode to use for the common search of the downlink control channel. In addition to the broadcast resource allocation for the common search space, the transmission subset scheme may also be applied in common search space transmission.
More specifically, in one embodiment, the common search space is defined and configured in the downlink control channel. The common search space of the downlink control channel does not overlap with the terminal-specific search space. The common search space may overlap with the broadcast terminal-specific search space. The common search space may be used for downloading system information and V2X terminal specific information. The V2X terminal may be configured to listen to the common search space of a conventional downlink control channel. The common search space may exist in all downlink control channels or may be configured through higher layer notification.
Another aspect of the invention relates to coordination of downlink control channel assignments with primary synchronization signals, secondary synchronization signals, and physical broadcast channels. In one embodiment, frequency division multiplexing between the interleaved downlink control channel intervals and the primary/secondary synchronization signals of the secondary frame and the physical broadcast channel is provided such that no overlap of the predefined signals and channels occurs.
In one embodiment, time-frequency resource blocks for the common search space are allocated above and below the primary and secondary synchronization signals and the physical broadcast channels, and for the time-frequency resource blocks of the cross-interleaved downlink control channel interval, no time-frequency resource blocks of existing signals and channels are included. The present invention provides for transmitting a common signal over a set of predefined time-frequency resources and a shared downlink control channel over a second set of time-frequency resources. The second set of time-frequency resources and the predefined time-frequency resources may not overlap when the shared downlink control channel is transmitted simultaneously with the common signal. The shared downlink control channel controls a format identifier channel, a HARQ identifier channel, or a downlink control channel.
For downlink control channel allocation between adjacent cells or transmission points, different cells are allocated control format identifier channels as well as HARQ identifier channels in non-overlapping resource blocks to avoid disturbances. In addition, different cells map control format identifier channels and HARQ identifier channels to non-overlapping time-frequency resource components to further avoid disturbances. Resources allocated to the control format identifier channel, the HARQ identifier channel, and the downlink control channel interval of the cross interlace are transmitted to the neighboring cells.
In one embodiment, three non-overlapping sets of resources are defined, each set corresponding to a cell ID downloaded by a primary synchronization signal of a cell, and the physical cell ID is interleaved with a secondary frame index using a pseudo-random function. Thus, even if two adjacent cells overlap in exactly one subframe, they may not overlap in a subsequent subframe.
Alternatively, if overlapping downlink control channel resources are allocated among neighboring cells or transmission points, the resource components may be shifted based on the cell ID. The shift may protect the control format identifier channel as well as the HARQ identifier channel and avoid collisions of the channels from neighboring cells or transmission points. For example, the indices of the control format identifier channel and the set of time-frequency resource components occupied by the HARQ identifier channel may be generated from the cell ID. Optionally, the resources allocated to the control format identifier channel, the HARQ identifier channel, and the downlink control channel interval of the cross interlace are simultaneously transmitted to the neighboring cells through a specific transmission interface.
That is, the present invention transmits a first shared downlink control channel from a first time frequency resource by a first transmission point and transmits a second shared downlink control channel from a second time frequency resource by a second transmission point. The first shared downlink control channel may download the same downlink control information as the second downlink control channel and coordinate the transmissions of the first and second transmission points such that the first time-frequency resources do not overlap the second time-frequency resources. The coordination is performed by a gNB connected to the first and second transmission points.
Preferably, since the resource for transmitting the HARQ response through the uplink control channel is connected to the index of the first channel element of the corresponding downlink control channel for downloading the downlink grant, if the downlink control channel is introduced, such indirect relationship needs to be re-evaluated. Therefore, in another aspect, the present invention indirectly represents the uplink control channel resource through the downlink control channel resource. An index of a first resource component of the downlink control channel may be used to represent uplink control channel resources. If a plurality of downlink control channel segments have been configured, the index of the starting resource component of each segment is notified to the V2X terminal to ensure that the V2X terminal generates direct uplink control channel resources for each corresponding downlink control channel.
In the broadcast transmission, if a channel component structure is reused, a mapping between a channel component index and an uplink control channel resource is reused. In the local transmission, due to the difference of the channel component structure, the indirect mapping relationship between the channel component index and the uplink control channel resource is redefined. And using a new resource component in the local downlink control channel transmission, consisting of a subgroup of time-frequency resource components of the set of time-frequency resource blocks. The subset is referred to as an enhanced channel component. If multiple downlink control channels are transmitted using local transmission, the enhanced channel component is configured as a queue and assigned indices in an ascending manner. At this point, the V2X terminal still uses the enhanced channel component index of the downlink control channel to generate resources for its corresponding uplink control channel transmission.
In the case where a plurality of downlink control channel segments are allocated, it is preferable that the V2X terminal be notified of the offset of the segment, and the V2X terminal be configured to search for the segment for its downlink control channel. The V2X terminal uses the sum of the offset and index of the first enhanced channel component of the downlink control channel to derive the corresponding uplink control channel resource index. Optionally, the V2X terminal uses the sum of the offset and the index of the last enhanced channel component of the downlink control channel to derive the corresponding uplink control channel resource index. The offset of each downlink control channel interval may be selected such that all corresponding uplink control channel resource indices of the interval do not overlap with uplink control channel resource indices of other downlink control channel intervals.
In summary, the invention provides a communication transmission control method for the internet of vehicles, which adaptively adjusts a channel according to a complex and changeable environment of the internet of vehicles, thereby improving the reliability of the whole internet of vehicles system while reducing communication delay.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented in a general purpose computing system, centralized on a single computing system, or distributed across a network of computing systems, and optionally implemented in program code that is executable by the computing system, such that the program code is stored in a storage system and executed by the computing system. Thus, the present invention is not limited to any specific combination of hardware and software.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (5)
1. A vehicle networking communication transmission control method is characterized by comprising the following steps:
determining a first set of time-frequency resources to transmit a first set of downlink control channels for a plurality of V2X terminals, wherein the first set of time-frequency resources are resources known to the plurality of V2X terminals, and wherein the first set of time-frequency resources includes at least one broadcast resource designated for enhancing downlink control channels;
mapping a first interval of the downlink control channel to the first set of time-frequency resources; and
assigning a second set of time-frequency resources for a second interval of the downlink control channel, wherein the second interval is dedicated to a terminal-specific search space, and wherein continuously available time-frequency resources of the first interval of the downlink control channel are allocated for the terminal-specific search space and a common search space in the downlink control channel.
2. The method of claim 1, wherein downlink control information downloads information associated with radio frequency network temporary authentication in a first interval of the downlink control channel.
3. The method of claim 2, wherein the first interval of the downlink control channel downloads information specific to a single V2X terminal.
4. The method of claim 3, wherein separate time-frequency resource blocks are allocated to the first set of time-frequency resources and the second set of time-frequency resources such that time-frequency resource components of the first interval of the downlink control channel do not overlap with time-frequency resource components of the second interval of the downlink control channel.
5. The method of claim 3, wherein the downlink control information of the first section of the downlink control channel is downloaded with the same scheduling information as that downloaded from a control region in the downlink control channel of the same subframe for multiple V2X terminals, wherein the downlink control information is transmitted with its CRC bits, which are scrambled by the radio frequency network temporary qualification.
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