Flexible cyclic delay diversity control in V2X scenario
阅读说明：本技术 V2x场景中的灵活的循环延迟分集控制 (Flexible cyclic delay diversity control in V2X scenario ) 是由 李栋 刘勇 T·维尔德斯彻克 于 2017-12-08 设计创作，主要内容包括：提供了用于V2X场景中的灵活循环延迟分集控制的措施。这种措施示例性地包括：确定车辆对外界侧链路传输中的至少一个参与方,基于所述至少一个参与方决定用于车辆对外界侧链路传输的循环延迟分集设置,以及传输指示循环延迟分集设置的信息。(Measures are provided for flexible cyclic delay diversity control in the V2X scenario. Such measures exemplarily include: the method includes determining at least one participant in a vehicle-to-ambient sidelink transmission, deciding a cyclic delay diversity setting for the vehicle-to-ambient sidelink transmission based on the at least one participant, and transmitting information indicative of the cyclic delay diversity setting.)
1. A method, comprising:
determining at least one participant in the vehicle's side link transmission to the outside world,
deciding a cyclic delay diversity setting for the vehicle to ambient side link transmission based on the at least one participant, an
Transmitting information indicating the cyclic delay diversity setting.
2. The method of claim 1, wherein
The cyclic delay diversity setting comprises a cyclic delay diversity delay value for the vehicle to outside world side link transmission.
3. The method of claim 1 or 2, wherein
The cyclic delay diversity arrangement affects the detection algorithm used for the vehicle to outside sidelink transmissions.
4. The method of any one of claims 1 to 3, wherein
The information is represented by at least one bit, wherein a status of the at least one bit indicates that no cyclic delay diversity delay is determined for the vehicle to outside sideline transmission.
5. The method of claim 4, wherein
The information is represented by a one-bit field comprising the at least one bit, wherein other states of the at least one bit indicate that a predetermined cyclic delay diversity delay value is decided for the vehicle to outside sideline transmission.
6. The method of claim 5, wherein
The other status of the at least one bit indicates that the predetermined cyclic delay diversity delay value is to be selected from a predetermined set of cyclic delay diversity delay values based on a data transmission bandwidth of the vehicle to an ambient sidelink transmission, and wherein optionally
The predetermined set of cyclic delay diversity delay values is specified in a system specification and/or distributed via configuration signaling.
7. The method of any one of claims 1 to 3, wherein
The information is represented by a multi-bit field,
a status of the multi-bit field indicating that no cyclic diversity delay is determined for the vehicle-to-ambient side link transmission, an
Each of the other states of the multi-bit field respectively indicates that a respective predetermined cyclic delay diversity delay value of a set of predetermined cyclic delay diversity delay values is decided for the vehicle to ambient side link transmission, and wherein optionally
The predetermined set of cyclic delay diversity delay values is specified in a system specification and/or distributed via configuration signaling.
8. The method of claim 7, wherein
The decision is further based on at least one of: the data transmission bandwidth of the vehicle to outside side link transmission and the application scene of the vehicle to outside side link transmission.
9. The method of any one of claims 1 to 8, wherein
The method is operable at or by a vehicle-to-ambient control entity of a cellular system, and/or
The cyclic delay diversity arrangement is a small delay cyclic delay diversity arrangement, and/or
The vehicle-to-outside side road transmission is vehicle-to-vehicle transmission, and/or
The vehicle-to-ambient side link transmission is via a vehicle-to-ambient data channel, and/or
The at least one participant includes a target receiver of the vehicle to outside sideline transmissions.
10. A method, the method comprising
Receiving information indicative of a cyclic delay diversity setting for vehicle-to-ambient side link transmission, and
adapting a detection algorithm used for the vehicle to outside world side link transmission based on the cyclic delay diversity setting.
11. The method of claim 10, wherein
The cyclic delay diversity setting comprises a cyclic delay diversity delay value for the vehicle to outside world side link transmission.
12. The method of claim 10 or 11, wherein
Said information being represented by at least one bit, wherein a status of said at least one bit indicates that no cyclic delay diversity delay is decided for said vehicle to outside world side link transmission, and
the detection algorithm used for the vehicle-to-ambient side link transmission is adapted to a cyclic delay diversity delay value of zero if no cyclic delay diversity delay is decided for the vehicle-to-ambient side link transmission.
13. The method of claim 12, wherein
The information is represented by a one-bit field comprising the at least one bit, wherein a further status of the at least one bit indicates that a predetermined cyclic delay diversity delay value is decided for the vehicle to outside world side link transmission, and
the method further comprises the following steps: deriving the predetermined cyclic delay diversity delay value from a configuration store if the predetermined cyclic delay diversity delay value is determined for the vehicle-to-ambient side link transmission, and wherein,
the detection algorithm used for the vehicle-to-ambient side link transmission is adapted to the predetermined cyclic delay diversity delay value if the predetermined cyclic delay diversity delay value is determined for the vehicle-to-ambient side link transmission.
14. The method of claim 13, wherein
The configuration store comprising a set of predetermined cyclic delay diversity delay values assigning a plurality of predetermined cyclic delay diversity delay values to a respective predetermined plurality of transmission bandwidths or transmission bandwidth ranges,
the predetermined cyclic delay diversity delay value is derived by: selecting from the predetermined set of cyclic delay diversity delay values based on a data transmission bandwidth of the vehicle to an ambient side link transmission, and wherein optionally
The predetermined set of cyclic delay diversity delay values is specified in a system specification and/or distributed via configuration signaling.
15. The method of claim 10 or 11, wherein
The information is represented by a multi-bit field,
a status of the multi-bit field indicating that no cyclic diversity delay is determined for the vehicle-to-ambient side link transmission, an
Each of the other states of the multi-bit field respectively indicates that a respective predetermined cyclic delay diversity delay value of a set of predetermined cyclic delay diversity delay values is decided for the vehicle to ambient side link transmission, and wherein optionally
The predetermined set of cyclic delay diversity delay values is specified in a system specification and/or distributed via configuration signaling.
16. The method of claim 15, wherein
If no cyclic delay diversity delay is decided for the vehicle-to-ambient side link transmission, the detection algorithm used for the vehicle-to-ambient side link transmission is adapted to a cyclic delay diversity delay value of zero, and
a configuration store includes a set of predetermined cyclic delay diversity delay values that respectively assign a plurality of predetermined cyclic delay diversity delay values to states of the multi-bit field, an
The method further comprises the following steps: deriving the predetermined cyclic delay diversity delay value from the configuration store based on the state of the multi-bit field if the predetermined cyclic delay diversity delay value of the predetermined set of cyclic delay diversity delay values is decided for the vehicle-to-ambient side link transmission, and wherein
The detection algorithm used for the vehicle-to-ambient side link transmission is adapted to the predetermined cyclic delay diversity delay value if the predetermined cyclic delay diversity delay value is determined for the vehicle-to-ambient side link transmission.
17. The method of any one of claims 10 to 16, wherein
The method is operable at or by a terminal, user equipment, mobile station or modem in a cellular system, and/or
The cyclic delay diversity arrangement is a small delay cyclic delay diversity arrangement, and/or
The vehicle-to-outside side road transmission is vehicle-to-vehicle transmission, and/or
The vehicle-to-ambient sidelink transmission is a transmission via a vehicle-to-ambient data channel.
18. An apparatus, the apparatus comprising
At least one processor for executing a program code for the at least one processor,
at least one memory including computer program code, and
at least one interface configured for communication with at least one other apparatus,
the at least one processor, with the at least one memory and the computer program code, is configured to cause the apparatus to perform:
determining at least one participant in the vehicle's side link transmission to the outside world,
deciding a cyclic delay diversity setting for the vehicle to ambient side link transmission based on the at least one participant, an
Transmitting information indicating the cyclic delay diversity setting.
19. The apparatus of claim 18, wherein
The cyclic delay diversity setting comprises a cyclic delay diversity delay value for the vehicle to outside world side link transmission.
20. The apparatus of claim 18 or 19, wherein
The cyclic delay diversity arrangement affects the detection algorithm used for the vehicle to outside sidelink transmissions.
21. The apparatus of any one of claims 18 to 20, wherein
The information is represented by at least one bit, wherein a status of the at least one bit indicates that no cyclic delay diversity delay is determined for the vehicle to outside sideline transmission.
22. The apparatus of claim 21, wherein
The information is represented by a one-bit field comprising the at least one bit, wherein other states of the at least one bit indicate that a predetermined cyclic delay diversity delay value is decided for the vehicle to outside sideline transmission.
23. The device of claim 22, wherein
The other status of the at least one bit indicates that the predetermined cyclic delay diversity delay value is to be selected from a predetermined set of cyclic delay diversity delay values based on a data transmission bandwidth of the vehicle to an ambient sidelink transmission, and wherein optionally
The predetermined set of cyclic delay diversity delay values is specified in a system specification and/or distributed via configuration signaling.
24. The apparatus of any one of claims 18 to 20, wherein
The information is represented by a multi-bit field,
a status of the multi-bit field indicating that no cyclic diversity delay is determined for the vehicle-to-ambient side link transmission, an
Each of the other states of the multi-bit field respectively indicates that a respective predetermined cyclic delay diversity delay value of a set of predetermined cyclic delay diversity delay values is decided for the vehicle to ambient side link transmission, and wherein optionally
The predetermined set of cyclic delay diversity delay values is specified in a system specification and/or distributed via configuration signaling.
25. The device of claim 24, wherein
The decision is further based on at least one of: the data transmission bandwidth of the vehicle to outside side link transmission and the application scene of the vehicle to outside side link transmission.
26. The apparatus of any one of claims 18 to 25, wherein
The apparatus is operable as or at a vehicle-to-ambient control entity of a cellular system, and/or
The cyclic delay diversity arrangement is a small delay cyclic delay diversity arrangement, and/or
The vehicle-to-outside side road transmission is vehicle-to-vehicle transmission, and/or
The vehicle-to-ambient side link transmission is via a vehicle-to-ambient data channel, and/or
The at least one participant includes a target receiver of the vehicle to outside sideline transmissions.
27. An apparatus, the apparatus comprising
At least one processor for executing a program code for the at least one processor,
at least one memory including computer program code, and
at least one interface configured for communication with at least one other apparatus,
the at least one processor, with the at least one memory and the computer program code, is configured to cause the apparatus to perform:
receiving information indicative of a cyclic delay diversity setting for vehicle-to-ambient side link transmission, and
adapting a detection algorithm used for the vehicle to outside world side link transmission based on the cyclic delay diversity setting.
28. The apparatus of claim 27, wherein
The cyclic delay diversity setting comprises a cyclic delay diversity delay value for the vehicle to outside world side link transmission.
29. The apparatus of claim 27 or 28, wherein
Said information being represented by at least one bit, wherein a status of said at least one bit indicates that no cyclic delay diversity delay is decided for said vehicle to outside world side link transmission, and
the detection algorithm used for the vehicle-to-ambient side link transmission is adapted to a cyclic delay diversity delay value of zero if no cyclic delay diversity delay is decided for the vehicle-to-ambient side link transmission.
30. The device of claim 29, wherein
The information is represented by a one-bit field comprising the at least one bit, wherein a further status of the at least one bit indicates that a predetermined cyclic delay diversity delay value is decided for the vehicle to outside world side link transmission, and
the at least one processor, with the at least one memory and the computer program code, is configured to cause the apparatus to: deriving the predetermined cyclic delay diversity delay value from a configuration store if the predetermined cyclic delay diversity delay value is determined for the vehicle-to-ambient side link transmission, and wherein
The detection algorithm used for the vehicle-to-ambient side link transmission is adapted to the predetermined cyclic delay diversity delay value if the predetermined cyclic delay diversity delay value is determined for the vehicle-to-ambient side link transmission.
31. The device of claim 30, wherein
The configuration store comprising a set of predetermined cyclic delay diversity delay values assigning a plurality of predetermined cyclic delay diversity delay values to a respective predetermined plurality of transmission bandwidths or transmission bandwidth ranges,
the predetermined cyclic delay diversity delay value is derived by: selecting from the predetermined set of cyclic delay diversity delay values based on a data transmission bandwidth of the vehicle to an ambient side link transmission, and wherein optionally
The predetermined set of cyclic delay diversity delay values is specified in a system specification and/or distributed via configuration signaling.
32. The apparatus of claim 27 or 28, wherein
The information is represented by a multi-bit field,
a status of the multi-bit field indicating that no cyclic diversity delay is determined for the vehicle-to-ambient side link transmission, an
Each of the other states of the multi-bit field respectively indicates that a respective predetermined cyclic delay diversity delay value of a set of predetermined cyclic delay diversity delay values is decided for the vehicle to ambient side link transmission, and wherein optionally
The predetermined set of cyclic delay diversity delay values is specified in a system specification and/or distributed via configuration signaling.
33. The device of claim 32, wherein
If no cyclic delay diversity delay is determined for the vehicle-to-ambient side link transmission, the detection algorithm used for the vehicle-to-ambient side link transmission is adapted to a cyclic delay diversity delay value of zero, and
a configuration store includes a set of predetermined cyclic delay diversity delay values that respectively assign a plurality of predetermined cyclic delay diversity delay values to states of the multi-bit field, an
The at least one processor, with the at least one memory and the computer program code, is configured to cause the apparatus to: deriving the predetermined cyclic delay diversity delay value from the configuration store based on the state of the multi-bit field if the predetermined cyclic delay diversity delay value of the predetermined set of cyclic delay diversity delay values is decided for the vehicle-to-ambient side link transmission, and wherein
The detection algorithm used for the vehicle-to-ambient side link transmission is adapted to the predetermined cyclic delay diversity delay value if the predetermined cyclic delay diversity delay value is determined for the vehicle-to-ambient side link transmission.
34. The apparatus of any one of claims 27 to 33, wherein
The apparatus may be operable as or at a terminal, user equipment, mobile station or modem in a cellular system, and/or
The cyclic delay diversity arrangement is a small delay cyclic delay diversity arrangement, and/or
The vehicle-to-outside side road transmission is vehicle-to-vehicle transmission, and/or
The vehicle-to-ambient sidelink transmission is a transmission via a vehicle-to-ambient data channel.
35. An apparatus, comprising:
determining circuitry configured to determine at least one participant in a vehicle-to-ambient sidelink transmission,
decision circuitry configured to decide a cyclic delay diversity setting for the vehicle to ambient side link transmission based on the at least one participant, an
Transmit circuitry configured to transmit information indicative of the cyclic delay diversity setting.
36. An apparatus, comprising:
receive circuitry configured to receive information indicative of a cyclic delay diversity setting of the vehicle to the outside world side link transmission, an
Adaptation circuitry configured to adapt a detection algorithm used for the vehicle to sidelink transmissions based on the cyclic delay diversity setting.
37. A computer program product comprising computer executable computer program code configured to cause a computer to perform the method of any of claims 1 to 9 or 10 to 17 when the program is run on the computer.
38. The computer program product according to claim 37, wherein the computer program product comprises a computer-readable medium on which the computer-executable computer program code is stored, and/or wherein the program is directly loadable into an internal memory of the computer or a processor thereof.
Technical Field
The invention relates to flexible Cyclic Delay Diversity (CDD) control of a vehicle in a vehicle-to-X V2X scenario. More particularly, the present invention illustratively relates to measures (including methods, apparatus and computer program products) for implementing flexible cyclic delay diversity control in the V2X scenario.
Background
This description relates generally to transmit diversity schemes for V2X.
There are attempts to use a small delay cyclic delay diversity (SD-CDD) transmit diversity scheme for the V2X control channel (physical sidelink control channel (PSCCH)). Further, there are also attempts to use a (transparent) small delay cyclic delay diversity (SD-CDD) transmit diversity scheme for the V2X data channel (physical sidelink shared channel (pscch)), rather than attempting a non-transparent scheme (e.g., single carrier space-frequency block coding (SC-SFBC)/single carrier space-time block coding (STBC)), especially in interference limited scenarios.
In any case, a detailed SD-CDD implementation is required, which also ensures backward compatibility for legacy UEs.
According to the current Rel-14V 2X definition, a single transmit antenna transmission mode is used. Further, currently, SD-CDD is specified only for downlink transmission. The basic principle of CDD is to transmit the same set of Orthogonal Frequency Division Multiplexing (OFDM) symbols on the same set of subcarriers with different cyclic delays on each antenna before adding a cyclic prefix. However, there is a lack of specification/definition for using SD-CDD for sidelink transmission.
Therefore, it is desirable to provide detailed SD-CDD implementation to achieve flexible cyclic delay diversity control in the V2X scenario.
Disclosure of Invention
Various exemplary embodiments of the present invention are directed to solving at least some of the problems and/or problems and disadvantages described above.
Various aspects of exemplary embodiments of the invention are set out in the appended claims.
According to an exemplary aspect of the invention, there is provided a method comprising: the method includes determining at least one participant in a vehicle-to-ambient sidelink transmission, deciding a cyclic delay diversity setting for the vehicle-to-ambient sidelink transmission based on the at least one participant, and transmitting information indicative of the cyclic delay diversity setting.
According to an exemplary aspect of the invention, there is provided a method comprising: the method comprises receiving information indicative of a cyclic delay diversity setting of a vehicle-to-ambient side link transmission, and adapting a detection algorithm used for the vehicle-to-ambient side link transmission based on the cyclic delay diversity setting.
According to an exemplary aspect of the invention, there is provided an apparatus comprising at least one processor, at least one memory including computer program code, and at least one interface configured to communicate with at least one other apparatus, the at least one processor, with the at least one memory and the computer program code, being configured to cause the apparatus to perform: the method includes determining at least one participant in a vehicle-to-ambient sidelink transmission, deciding a cyclic delay diversity setting for the vehicle-to-ambient sidelink transmission based on the at least one participant, and transmitting information indicative of the cyclic delay diversity setting.
According to an exemplary aspect of the invention, there is provided an apparatus comprising at least one processor, at least one memory including computer program code, and at least one interface configured to communicate with at least one other apparatus, the at least one processor, with the at least one memory and the computer program code, being configured to cause the apparatus to perform: the method comprises receiving information indicative of a cyclic delay diversity setting of a vehicle-to-ambient side link transmission, and adapting a detection algorithm used for the vehicle-to-ambient side link transmission based on the cyclic delay diversity setting.
According to an exemplary aspect of the invention, there is provided an apparatus comprising: the apparatus includes determination circuitry configured to determine at least one participant in a vehicle-to-ambient sidelink transmission, decision circuitry configured to decide a cyclic delay diversity setting for the vehicle-to-ambient sidelink transmission based on the at least one participant, and transmit circuitry configured to transmit information indicative of the cyclic delay diversity setting.
According to an exemplary aspect of the invention, there is provided an apparatus comprising: receiving circuitry configured to receive information indicative of a cyclic delay diversity setting of a vehicle-to-ambient sidelink transmission, and adapting circuitry configured to adapt a detection algorithm used for the vehicle-to-ambient sidelink transmission based on the cyclic delay diversity setting.
According to an exemplary aspect of the invention, a computer program product is provided comprising computer executable computer program code configured to cause a computer to perform a method according to any of the aforementioned method-related exemplary aspects of the invention, when the program is run on the computer (e.g. the computer of the apparatus according to any of the aforementioned apparatus-related exemplary aspects of the invention).
Such a computer program product may comprise (or comprise) a (tangible) computer-readable (storage) medium or the like having computer-executable computer program code stored therein, and/or the program may be directly loadable into the internal memory of a computer or a processor thereof.
Any of the above aspects supports efficient SD-CDD control for V2X data channels, thereby ensuring improved performance and backwards compatibility, and thereby addressing at least a portion of the problems and disadvantages identified in connection with the prior art.
By the exemplary embodiments of this invention, flexible cyclic delay diversity control is provided in the V2X scenario. More specifically, by way of example embodiments of the present invention, measures and mechanisms are provided for implementing flexible cyclic delay diversity control in the V2X scenario.
Thus, improvements are achieved by methods, apparatuses and computer program products that enable/implement flexible cyclic delay diversity control in the V2X scenario.
Drawings
The invention will be described in more detail hereinafter, by way of non-limiting examples, with reference to the accompanying drawings, in which
Figure 1 is a block diagram illustrating an apparatus according to an exemplary embodiment of the present invention,
figure 2 is a block diagram illustrating an apparatus according to an exemplary embodiment of the present invention,
figure 3 is a block diagram illustrating an apparatus according to an exemplary embodiment of the present invention,
figure 4 is a schematic diagram of a procedure according to an exemplary embodiment of the present invention,
figure 5 is a schematic diagram of a procedure according to an exemplary embodiment of the present invention,
figure 6 shows a graph of example simulation results for a V2X link,
FIG. 7 shows a graph of example simulation results for a V2X link, an
Fig. 8 is a block diagram alternatively illustrating an apparatus according to an exemplary embodiment of the present invention.
Detailed Description
The invention is described herein with reference to specific non-limiting examples and examples of what are presently considered to be possible embodiments of the invention. Those skilled in the art will appreciate that the present invention is by no means limited to these examples and may be more broadly applied.
It is noted that the following description of the present invention and its embodiments primarily refers to specifications used as non-limiting examples of certain exemplary network configurations and deployments. That is, the present invention and its embodiments are described primarily with respect to the 3GPP specification of V2X, which serves as a non-limiting example of certain exemplary network configurations and deployments. As such, the description of the exemplary embodiments presented herein specifically refers to terms directly related thereto. Such terms are used only in the context of the non-limiting examples presented and naturally do not limit the invention in any way. Rather, any other communication or communication-related system deployment, etc. may be utilized consistent with the features described herein.
In the following, various embodiments and implementations of the invention and aspects or embodiments thereof are described using several variations and/or alternatives. It is generally noted that all the described variants and/or alternatives may be provided alone or in any possible combination (including also combinations of individual features of the various variants and/or alternatives), according to certain needs and constraints.
In general, in accordance with exemplary embodiments of the invention, measures and mechanisms are provided for (enabling/implementing) flexible cyclic delay diversity control in the V2X scenario.
Generally, according to an exemplary embodiment of the present invention, SD-CDD related information is indicated through a V2X control channel. In particular, a signaling mechanism is provided for control channels over V2X to implement SD-CDD for V2X data channels to ensure improved performance and backward compatibility. Therefore, according to an exemplary embodiment of the present invention, a single or a plurality of SD-CDD delay values may be indicated and SD-CDD may be dynamically turned on and off.
Fig. 1 is a block diagram illustrating an apparatus according to an exemplary embodiment of the present invention. The apparatus may be a
As shown in fig. 4, the program according to the exemplary embodiment of the present invention includes: determining (S41) operation of at least one participant in a vehicle-to-ambient sidelink transmission, deciding (S42) operation of a cyclic delay diversity setting for the vehicle-to-ambient sidelink transmission based on the at least one participant, and transmitting (S43) information indicative of the cyclic delay diversity setting.
In an embodiment, at least some of the functionality of the apparatus shown in fig. 1 may be shared between two physically separated devices forming one operational entity. Accordingly, the apparatus may be considered to depict an operational entity comprising one or more physically separate devices for performing at least some of the described processes.
According to an exemplary embodiment of the invention, the cyclic delay diversity setting comprises a cyclic delay diversity delay value for the vehicle to outside world side link transmission.
According to a further exemplary embodiment of the present invention, the cyclic delay diversity setting affects a detection algorithm used for the vehicle to outside world side link transmission.
According to a further exemplary embodiment of the present invention, the information is represented by at least one bit, wherein a status of the at least one bit indicates that no cyclic delay diversity delay is decided for the vehicle to outside world side link transmission.
According to a further exemplary embodiment of the present invention, the information is represented by a one-bit field comprising the at least one bit, wherein a further status of the at least one bit indicates that a predetermined cyclic delay diversity delay value is decided for the vehicle to outside world side link transmission.
According to a further exemplary embodiment of the present invention, the other state of the at least one bit indicates that the predetermined cyclic delay diversity delay value is to be selected from a predetermined set of cyclic delay diversity delay values based on a data transmission bandwidth of the vehicle to an ambient sidelink transmission.
According to a further exemplary embodiment of the present invention, the information is represented by a multi-bit field, one state of the multi-bit field indicating that no cyclic diversity delay is decided for the vehicle-to-ambient side link transmission, and each of the other states of the multi-bit field respectively indicating that a respective predetermined cyclic delay diversity delay value of a predetermined set of cyclic delay diversity delay values is decided for the vehicle-to-ambient side link transmission.
According to a further exemplary embodiment of the present invention, the predetermined set of cyclic delay diversity delay values is specified in a system specification and/or distributed via configuration signaling.
According to a further exemplary embodiment of the invention, the deciding is further based on at least one of: the data transmission bandwidth of the vehicle to outside side link transmission and the application scene of the vehicle to outside side link transmission.
According to a further exemplary embodiment of the present invention, the cyclic delay diversity arrangement is a small delay cyclic delay diversity arrangement.
According to a further exemplary embodiment of the invention, the vehicle-to-outside-side road transmission is a vehicle-to-vehicle transmission.
According to a further exemplary embodiment of the present invention, the vehicle-to-ambient side link transmission is a transmission via a vehicle-to-ambient data channel.
According to a further exemplary embodiment of the present invention, the at least one participant comprises a target receiver of the vehicle to outside world side link transmission.
The V2X control entity may be the entity responsible for controlling/setting the V2X transmission parameters. The V2X control entity may be located at a base station (e.g., in LTE V2X mode 3) or may be located at a V2X transmitter UE (e.g., in LTE V2X mode 4). In LTE V2X mode 3, the base station may control CDD setting information and may indicate the information to the V2X transmitter UE. The V2X transmitter UE may then communicate this information to its receiver in its control channel to assist the receiver in detecting the associated data transmission. In LTEV2X mode 4, the V2X transmitter UE may autonomously set CDD setting information and indicate the CDD setting information to its receiver in a control channel.
Fig. 2 is a block diagram illustrating an apparatus according to an exemplary embodiment of the present invention. The apparatus may be a
As shown in fig. 5, a process according to an exemplary embodiment of the present invention includes: -an operation of receiving (S51) information indicative of a cyclic delay diversity setting of a vehicle to ambient side link transmission, and-an operation of adapting (S52) a detection algorithm for the vehicle to ambient side link transmission based on the cyclic delay diversity setting.
Fig. 3 is a block diagram illustrating an apparatus according to an exemplary embodiment of the present invention. In particular, fig. 3 illustrates a variation of the device shown in fig. 2. The arrangement according to fig. 3 may therefore further comprise deriving circuitry 31.
In an embodiment, at least some of the functionality of the apparatus shown in fig. 2 (or 3) may be shared between two physically separate devices forming one operational entity. Accordingly, the apparatus may be considered to depict an operational entity comprising one or more physically separate devices for performing at least some of the described processes.
According to an exemplary embodiment of the invention, the cyclic delay diversity setting comprises a cyclic delay diversity delay value for the vehicle to outside world side link transmission.
According to a further exemplary embodiment of the present invention, the information is represented by at least one bit, wherein a status of the at least one bit indicates that no cyclic delay diversity delay is decided for the vehicle-to-ambient side link transmission, and the detection algorithm for the vehicle-to-ambient side link transmission is adapted to a cyclic delay diversity delay value of zero if no cyclic delay diversity delay is decided for the vehicle-to-ambient side link transmission.
According to a variant of the procedure shown in fig. 5, the information is represented by a one-bit field comprising the at least one bit, wherein a further state of the at least one bit indicates that a predetermined cyclic delay diversity delay value is decided for the vehicle to outside link transmission, and the method may comprise: an operation of deriving the predetermined cyclic delay diversity delay value from a configuration store if the predetermined cyclic delay diversity delay value is determined for the vehicle-to-ambient side link transmission. Further, according to this variant, the detection algorithm for the vehicle-to-ambient side link transmission is adapted to the predetermined cyclic delay diversity delay value, if the predetermined cyclic delay diversity delay value is decided for the vehicle-to-ambient side link transmission.
According to a further exemplary embodiment of the present invention, the configuration store comprises a set of predetermined cyclic delay diversity delay values assigning a plurality of predetermined cyclic delay diversity delay values to a respective predetermined plurality of transmission bandwidths or transmission bandwidth ranges, and the predetermined cyclic delay diversity delay values are derived by: selecting from the set of predetermined cyclic delay diversity delay values based on a data transmission bandwidth of the vehicle to an ambient side link transmission.
According to a further exemplary embodiment of the present invention, the information is represented by a multi-bit field, one state of the multi-bit field indicating that no cyclic diversity delay is decided for the vehicle-to-ambient side link transmission, and each of the other states of the multi-bit field respectively indicating that a respective predetermined cyclic delay diversity delay value of a predetermined set of cyclic delay diversity delay values is decided for the vehicle-to-ambient side link transmission.
According to a further exemplary embodiment of the present invention, the set of predetermined cyclic delay diversity delay values is specified in a system specification and/or distributed via configuration signaling.
According to a variant of the procedure shown in fig. 5, if no cyclic delay diversity delay is decided for the vehicle-to-ambient side link transmission, the detection algorithm used for the vehicle-to-ambient side link transmission is adapted to a cyclic delay diversity delay value of zero and the arrangement storage comprises the set of predetermined cyclic delay diversity delay values assigning a plurality of predetermined cyclic delay diversity delay values to the states of the multi-bit field, respectively, and the method may comprise: an operation of deriving the predetermined cyclic delay diversity delay value from the configuration store based on the state of the multi-bit field if the predetermined cyclic delay diversity delay value of the predetermined set of cyclic delay diversity delay values is decided for the vehicle-to-ambient side link transmission. According to this variant, the detection algorithm used for the vehicle-to-ambient side link transmission is adapted to the predetermined cyclic delay diversity delay value if the predetermined cyclic delay diversity delay value is decided for the vehicle-to-ambient side link transmission.
According to a further exemplary embodiment of the present invention, the cyclic delay diversity arrangement is a small delay cyclic delay diversity arrangement.
According to a further exemplary embodiment of the invention, the vehicle-to-outside-side road transmission is a vehicle-to-vehicle transmission.
According to a further exemplary embodiment of the present invention, the vehicle-to-ambient side link transmission is a transmission via a vehicle-to-ambient data channel.
According to a further exemplary embodiment of the present invention, the device (i.e., V2X user entity) 20 may be the target receiver of the vehicle to outside world side link transmissions.
That is, according to an exemplary embodiment of the present invention, the V2X control channel dynamically indicates SD-CDD related information on its associated V2X data channel. In the following, options for implementing exemplary embodiments of the present invention are explained in more specific terms.
The flexible signaling mechanism according to the explained options for implementing exemplary embodiments of the present invention supports a good trade-off between CDD diversity gain and backward compatibility.
For example, if the V2X data packet is intended for both legacy UEs and new (non-legacy) UEs (i.e., UEs implementing various aspects of the present invention), then the CDD may be turned off (using either the first or second signaling options) or the SD-CDD delay value may be set to zero or a small value (using the third signaling option). The reason for this is that the link simulations as shown in fig. 6 and 7 show that relatively large CDD delay values (e.g., 1 μ s or even 2 μ s) may negatively impact the detection performance of legacy UEs, since the legacy UEs are not aware of the SD-CDD used. On the other hand, since new (non-legacy) UEs are aware of SD-CDD, they can know the SD-CDD delay value from the control signaling and optimize the detection operation accordingly, e.g., with respect to time/frequency synchronization. Here, fig. 6 illustrates the simulation result of 30km/h (QPSK +1/2TC exceeds 20 PRB), and fig. 7 illustrates the simulation result of 280km/h (QPSK +1/2TC exceeds 20 PRB). For this consideration, it is assumed that legacy UEs do not know SD-CDD, while new (non-legacy) UEs know SD-CDD and optimize the detection operation with the signaled SD-CDD delay value.
According to a first option for implementing the exemplary embodiment of the present invention, the dynamic indication information carried by the V2X control channel is only binary CDD on or CDD off information. If SD-CDD is indicated (to be) used for the V2X data channel, then according to a first option, the SD-CDD delay value is determined as follows.
A single small delay value is explicitly specified in the system specification. This is valid for all V2X data channel transmissions with various transmission Bandwidths (BWs). While a single small delay value may be explicitly specified in the system specification, alternatively, the single small delay value may be semi-statically configured (or pre-configured) by the cellular network, e.g., via higher layer signaling. Either way, a single small delay value is known to both the V2X transmitter UE and the receiver UE.
To explain in more detail the first option for implementing an exemplary embodiment of the present invention, it is assumed that a single SD-CDD delay value is fixed to 1 μ s and is explicitly specified in the system specification (see other variants above). In the V2X control channel, a field having one bit is defined to indicate whether SD-CDD is used, for example,
V2X control channel field: {
xxx
SD-CDD indicator: 1 bit, 0 indicating that SD-CDD is not used, 1 indicating that SD-CDD is used with a predefined SD-CDD delay value;
xxx
}
for V2X data packets targeted only to new UEs (i.e., non-legacy UEs, UEs implementing aspects of the invention), the associated V2X control sets the field of the SD-CDD indicator to 1. When a new UE detects the V2X control channel and finds that the SD-CDD indicator field is set to 1, then it knows that the V2X data channel uses SD-CDD with a delay of 1 μ s, and therefore an optimized detection algorithm is applied to detect the V2X data. Specifically, in a time/frequency synchronization procedure, the UE may perform a correlation operation using two separate demodulation reference signal (DMRS) waveforms (here, the second DMRS waveform is a SD-CDD delayed version of the first DMRS waveform), and then combine the two correlation results to obtain a timing synchronization result and a frequency synchronization result.
For a V2X data packet targeting both legacy and new UEs, the associated V2X control would set the field of the SD-CDD indicator to 0. In this way, the detection performance of the legacy UE will not be degraded, and the new UE will know that SD-CDD is not applied and can perform an appropriate reception operation (same as the legacy UE).
According to a second option for implementing an exemplary embodiment of the present invention, just like the first option, the dynamic indication information carried by the V2X control channel is only binary CDD on or CDD off information. If SD-CDD is indicated (to be) for the V2X data channel, the SD-CDD delay value is determined as follows according to the second option.
A table of SD-CDD delay values related to the transmission bandwidth is explicitly specified in the system specification. While the table of SD-CDD delay values related to transmission bandwidth may be explicitly specified in the system specification, alternatively, the table of SD-CDD delay values related to transmission bandwidth may be semi-statically configured (or pre-configured) by the cellular network via, for example, higher layer signaling. In either case, tables of SD-CDD delay values with respect to transmission bandwidth are well known for V2X transmitter UE and receiver UE. The determination according to the second option method is more flexible than the first option described above because according to the second option, a plurality of SD-CDD delay values may be allowed depending on the transmission bandwidth of the V2X data channel.
The rationale for the second option is that using SD-CDD introduces additional frequency selectivity to obtain frequency diversity gain, so in principle, the narrower the transmission bandwidth, the larger the required small delay value, if a similar amount of diversity gain is required.
To explain in more detail the second option for implementing an exemplary embodiment of the present invention, assume that a table of SD-CDD delays related to transmission bandwidth is explicitly specified in the system specification (see other variants above). An example of such a table is provided below.
V2X data transmission BW
SD-CDD
[1～10]PRBs
2μs
[10～25]PRBs
1μs
>＝25PRBs
0.5μs
In the V2X control channel, a field with one bit is defined to indicate whether SD-CDD is (to be) used, similar to the discussion above regarding the first option.
For a V2X data packet targeting only new (non-legacy) UEs, the associated V2X control would set the field of the SD-CDD indicator to 1. The SD-CDD delay value will be determined according to the V2X data transmission bandwidth, e.g., if V2X data is transmitted on 20 PRBs (PRBs: physical resource blocks), then SD-CDD with a delay value of 1 μ s will be used. For the new UE receiver, it first decodes the V2X control channel and finds that the SD-CDD indicator field is set to 1 and also knows that the associated data transmission exceeds 20 PRBs, then it will know that the SD-CDD delay value is 1 μ s, and then can take this information into account for optimized reception operation, as already discussed above with respect to the first option.
According to a third option for implementing an exemplary embodiment of the invention, the dynamic information carried by the V2X control channel indicates the SD-CDD delay value used by the V2X data channel. In the method, a set of a plurality of SD-CDD delay values is predefined, and the dynamic information may indicate an index of a small delay value used. While the set of multiple SD-CDD delay values may be explicitly specified in the system specification, alternatively, the set of multiple SD-CDD delay values may be semi-statically configured (or pre-configured) by the cellular network via, for example, higher layer signaling. Either way, the set of multiple SD-CDD delay values is known to the V2X transmitter UE and receiver UE. It is noted that a "0" (zero) value may be defined in the set of delay values indicating that SD-CDD is (will) not be used for the V2X data channel, or will be (will) used with zero delay (both cases are essentially equivalent).
In more detail, according to an exemplary embodiment of the present invention, a set of delay values is predefined in a system specification, which includes a plurality of SD-CDD delay values.
An example of a set of delay values is
The SD-CDD delay value set is {0, 0.5us, 1us, 2us }.
In this case, in the V2X control channel, a field having two bits is defined to indicate which SD-CDD delay value is used, for example,
V2X control channel field: {
xxx
SD-CDD indicator: 2 bits, where 00, 01, 10, and 11 indicate SD-CDD delay values of 0, 0.5 μ s, 1 μ s, and 2 μ s, respectively.
xxx
}
For V2X data packets targeted only to new (non-legacy) UEs, the associated V2X control may set the fields of SD-CDD appropriately taking into account, for example, transmission bandwidth and even application scenarios.
For example, if the bandwidth of the V2X data transmission is small, e.g., 3 PRBs, or the channel delay of an application scenario is very small, e.g., in an expressway scenario, a relatively large SD-CDD delay value may be configured, e.g., the SD-CDD indicator may be set to "11". For the new UE receiver, they first decode the V2X control channel and find that the SD-CDD indicator field is set to "11", so they know to use SD-CDD with a delay of 2 μ s. Thus, as described above with respect to the first option, such a UE may perform an optimized reception operation to decode V2X data.
For V2X data packets targeting legacy UEs and new UEs, the associated V2X control may set the SD-CDD delay value to a relatively small value, e.g., the SD-CDD indicator of "00", meaning that SD-CDD is not (to be) applied at the transmitter. In this way, the performance of legacy UEs will not be affected.
The above-described processes and functions may be implemented by respective functional elements, processors, etc., as described below.
In the foregoing exemplary description of the network entities, only functional blocks have been used to describe elements that are relevant for understanding the principles of the present invention. The network entities may include other elements necessary for their respective operations. However, the description of these units is omitted in this specification. The arrangement of the functional blocks of the device does not constitute a limitation of the present invention, and the functions may be performed by one block or further divided into sub-blocks.
When it is stated in the foregoing description that an apparatus, i.e. a network entity (or some other apparatus), is configured to perform certain functions, this is to be interpreted as equivalent to a description stating that a (i.e. at least one) processor or corresponding circuitry, possibly in cooperation with computer program code stored in a memory of the respective apparatus, is configured to cause the apparatus to perform at least the functions mentioned thus. Also, such functions should be construed as equivalently implementable by specially configured circuitry or devices for performing the respective functions (i.e., the expression "a unit configured as …" is interpreted to be equivalent to an expression such as "a device for …" etc.).
In fig. 8, an alternative illustration of an apparatus according to an exemplary embodiment of the present invention is depicted. As indicated in fig. 8, according to an exemplary embodiment of the present invention, a device (e.g., a V2X control entity) 10' (corresponding to the V2X control entity 10) includes a processor 81, a memory 82, and an interface 83 connected by a bus 84 or the like. Further, according to an exemplary embodiment of the present invention, the devices (e.g., V2X user entity) 20' (corresponding to the V2X user entity 20) include a processor 85, a memory 86, and an interface 87, which are connected by a bus 88 or the like, and the devices may be connected via links 89, respectively.
The processor 81/85 and/or the interface 83/87 can also include a modem or the like to facilitate communications over a (hard-wired or wireless) link, respectively. The interface 83/87 may include a suitable transceiver coupled to one or more antennas or communication devices for (hard-wired or wireless) communication with the linked or connected device(s), respectively. The interface 83/87 is generally configured to communicate with, i.e., interface with, at least one other apparatus.
The memory 82/86 may store respective programs, which are assumed to include program instructions or computer program code, that, when executed by respective processors, enable the respective electronic devices or apparatuses to operate in accordance with exemplary embodiments of the present invention.
In general, the respective devices/apparatuses (and/or components thereof) may represent components for performing the respective operations and/or exhibiting the respective functionalities, and/or the respective devices (and/or components thereof) may have functions for performing the respective operations and/or exhibiting the respective functionalities.
When it is stated in the following description that the processor (or some other apparatus) is configured to perform certain functions, this is to be interpreted as equivalent to the description stating that at least one processor, possibly in cooperation with computer program code stored in a memory of the respective apparatus, is configured to cause the apparatus to perform at least the functions mentioned thus. Also, such functions should be construed as being equivalently implementable by a specially configured apparatus for performing the corresponding functions (i.e., the expression "a processor configured [ cause the apparatus ] to perform xxx" is interpreted to be equivalent to the expression such as "an apparatus for xxx", etc.).
According to an exemplary embodiment of the present invention, the apparatus representing the
Further, according to an exemplary embodiment of the present invention, the apparatus representing the
For further details regarding the operability/functionality of the individual devices, reference is made to the above description in connection with any one of fig. 1 to 7, respectively.
For the purposes of the invention as described herein above, it should be noted that:
method steps (as examples of devices, apparatuses and/or modules thereof, or as examples of entities including apparatuses and/or modules thereof) possibly implemented as software code portions and run using processors at a network server or network entity are independent of the software code and can be specified using any known or future developed programming language as long as the functionality defined by the method steps is preserved;
in general, any method step is suitable to be implemented as software or by hardware without changing the idea of the embodiment and its modifications in the implemented functionalities;
method steps and/or devices, units or means (e.g. devices performing the functions of the device according to the above described embodiments) which may be implemented as hardware components at the above defined device or any module(s) thereof are hardware independent and may be implemented using any known or future developed hardware technology or any mixture of these technologies, such as MOS (metal oxide semiconductor), CMOS (complementary MOS), BiMOS (bipolar MOS), BiCMOS (bipolar CMOS), ECL (emitter coupled logic), TTL (transistor-transistor logic), etc., e.g. using ASIC (application specific IC (integrated circuit)) components, FPGA (field programmable gate array) components, CPLD (complex programmable logic device) components or DSP (digital signal processor) components;
devices, units or components (e.g. the network entities or network registers defined above or any of their respective units/means) may be implemented as individual devices, units or components, but this does not exclude that they are implemented in a distributed manner throughout the system as long as the functionality of the devices, units or components is preserved;
means such as user equipment and network entities/network registers may be represented by a semiconductor chip, a chipset or a (hardware) module comprising such a chip or chipset; however, this does not exclude the possibility of: the functionality of the means or modules, rather than being implemented in hardware, is implemented as software in (software) modules, such as a computer program or a computer program product comprising executable software code portions for executing/running on processors;
for example, a device may be considered a component of an apparatus or more than one apparatus, whether functionally in cooperation with each other or functionally independently of each other but in the same device housing.
Generally, it is to be noted that the respective functional blocks or elements according to the above-described aspects may be implemented in hardware and/or software, respectively, in any known manner, if only adapted to perform the functions of the respective parts described. The mentioned method steps may be implemented in separate functional blocks or by means of separate devices or one or more method steps may be implemented in a single functional block or by means of a single device.
In general, any method steps are suitable to be implemented as software or implemented by hardware without changing the idea of the invention. The devices and apparatuses may be implemented as individual devices, but this does not exclude that they are implemented in a distributed manner throughout the system, as long as the functionality of the devices is preserved. This and similar principles should be considered known to the skilled person.
For the purposes of this specification, software includes software code comprising code means or portions or a computer program product for performing the respective functions as well as software (or a computer program product) embodied on a tangible medium, such as a computer readable (storage) medium, which may have stored thereon a corresponding data structure or code means/portions or embodied in a signal or chip during processing thereof.
The invention also covers any possible combination of the above described method steps and operations and any possible combination of the above described nodes, devices, modules or elements, as long as the above described concepts of method and structural arrangement are applicable.
In view of the above, measures for flexible cyclic delay diversity control in the V2X scenario are provided. Such measures exemplarily include: the method includes determining at least one participant in a vehicle-to-ambient sidelink transmission, deciding a cyclic delay diversity setting for the vehicle-to-ambient sidelink transmission based on the at least one participant, and transmitting information indicative of the cyclic delay diversity setting.
Even though the invention is described above with reference to an example according to the accompanying drawings, it is to be understood that the invention is not limited thereto. Rather, it will be apparent to those skilled in the art that the present invention may be modified in numerous ways without departing from the scope of the inventive concept disclosed herein.
List of abbreviations and abbreviations
3GPP third generation partnership project
BW bandwidth
CDD cyclic delay diversity
DMRS demodulation reference signals
LTE Long term evolution
OFDM orthogonal frequency division multiplexing
PRB physical resource block
PSCCH physical side link control channel
PSSCH physical sidelink shared channel
QPSK quadrature phase shift keying
SC-SFBC single carrier space frequency block coding
SD-CDD small delay cyclic delay diversity
STBC single carrier space-time block coding
V2X vehicle facing outside