Otfs-based communications with improved resource allocation

Abstract

The invention relates to OTFS-based communications with improved resource allocation. An orthogonal time-frequency space (OTFS) communication method for communicating between a user equipment (UE) and a base station (BS) is provided. The OTFS communication method comprises the step of transmitting (103), in particular by the UE, a report comprising a delay and a Doppler shift to the BS.

Description

TECHNICAL FIELD

[0001] The present invention relates to Orthogonal Time Frequency Space (OTFS) based communication with improved resource allocation. In particular, the present invention relates to an OTFS communication method for communicating between a user equipment, UE, and a base station, BS, an OTFS user equipment, UE, an OTFS base station, BS, an OTFS communication system, and an OTFS communication tester. BACKGROUND

[0002] Generally, in the context of an increasing number of communication applications employing OTFS, there is an increasing need for improving resource allocation, as different inefficiencies affect resource allocation in an unfavorable way.

[0003] For example, WO 2023 / 137652 A1 relates to wireless communication. In some aspects, a user equipment (UE) can receive, from a base station, a configuration of a control region in a delay-Doppler domain. The UE can receive, from the base station, a physical downlink control channel (PDCCH) communication with orthogonal time frequency space (OTFS) precoding. The UE can decode the PDCCH communication with the OTFS precoding based at least in part on the configuration of the control region in the delay-Doppler domain.

[0004] Further, EP 3 940 975 A1 discloses a system and method of operating an Internet of Things (IOT) device and an IOT manager device. The method comprises determining an OTFS transmission waveform using two-dimensional (2D) channel state information related to a delay-Doppler channel domain during operation of the IOT device in a low power mode. The method further comprises transmitting the OTFS transmission waveform during operation of the IOT device in a high power mode. The process of determining the OTFS transmission waveform can comprise, for example, receiving the 2D channel state information from the IOT manager device and storing it in a memory of the IOT device. Alternatively, at least one OTFS pilot transmission can be received from the IOT manager device and the 2D channel state information is determined using the OTFS pilot transmission.

[0005] Further, US 2022 / 0352933 A1 discloses a wireless communication device comprising a feed port comprising a plurality of input feeds, a precoding subsystem electrically connected to the feed port, and an antenna subsystem electrically connected to the precoding subsystem. The antenna subsystem is configured to transmit output signals of the precoding subsystem to a plurality of wireless stations using a plurality of beams. The precoding subsystem is configured to perform a precoding operation on input signals from the feed port, wherein the precoding operation maximizes a desired signal level to interference ratio of transmissions to the plurality of wireless stations.

[0006] Furthermore, WO 2023 / 053472 A1 provides a wireless communication device, system, method, and program capable of demodulating an OTFS signal with high accuracy and using minimal computation, while maintaining a high data rate OTFS signal. The wireless communication device includes a receiving unit that performs channel estimation using a first reference signal, performs phase correction using a second reference signal, and uses the results of the channel estimation and phase correction to demodulate the received OTFS signal.

[0007] Furthermore, CN 115087110 A relates to a resource allocation method and related equipment based on an orthogonal time-frequency spatial system. It is based on a communication network formed by multiple highly mobile users and base stations. For ideal pulse waveforms satisfying the biorthogonality condition, a simplified NIMP algorithm is used to allocate resource grids to multiple highly mobile users, and the IA-WF algorithm is used to achieve power allocation among different highly mobile users. For non-ideal pulse waveforms that do not satisfy the biorthogonality condition, the GSMA algorithm is used to allocate resource grids to multiple highly mobile users. Based on the allocated resource grids, a genetic algorithm is used to achieve power allocation among different highly mobile users, maximizing the overall system throughput under non-ideal pulse waveform conditions. Taking into full account the differences in channel conditions, the DD domain resources of the smallest unit are allocated to each highly mobile user, establishing corresponding power allocation schemes for ideal and non-ideal pulses, and improving system energy efficiency. Summary of the Invention

[0008] Therefore, especially considering the aforementioned disadvantages and inefficiencies, the object of the present invention is to provide an OTFS communication method, an OTFS user equipment UE, an OTFS base station BS, an OTFS communication system, and an OTFS communication tester for communication between a user equipment UE and a base station BS, wherein resource allocation can be improved in a particularly efficient and reliable manner.

[0009] This objective is achieved through the features of the OTFS communication method for communication between a User Equipment (UE) and a Base Station (BS) according to the present invention, the features of the OTFS User Equipment (UE), the features of the OTFS Base Station (BS), the features of the OTFS communication system, and the features of the OTFS communication tester. The present invention includes further improvements.

[0010] According to a first aspect of the present invention, an orthogonal time-frequency space (OTFS) communication method is provided for communication between a user equipment (UE) and a base station (BS). The OTFS communication method includes the steps of: sending a report, including delay and Doppler shift, to the BS, particularly by the UE.

[0011] Advantageously, resource allocation in OTFS operations can be improved in a particularly efficient and reliable manner.

[0012] Regarding the term "OTFS communication," it should be noted that the term can be specifically understood as "OTFS-based communication," and it can be similarly applied to the following situations.

[0013] According to one implementation of the first aspect of the invention, the report includes or may include a Channel State Information (CSI) report. Alternatively, the delay and Doppler shift may include or include delay and Doppler shift with respect to at least one selected channel and / or at least one fading channel.

[0014] Advantageously, for example, a new CSI report type can be provided, which can improve resource allocation in OTFS operations in a particularly efficient and reliable manner.

[0015] According to one implementation of the first aspect of the invention, the report is transmitted using a Physical Uplink Control Channel (PUCCH). Alternatively, the report is transmitted using a Physical Uplink Shared Channel (PUSCH).

[0016] Advantageously, for example, it can reduce complexity, thereby further improving efficiency.

[0017] According to one implementation of the first aspect of the invention, the OTFS communication method further includes the step of: preferably, before sending the report, in particular, the BS instructs the UE to selectively send the report and / or at least one additional report.

[0018] Advantageously, for example, a new CSI report type and / or at least one previous CSI report category can be sent. More advantageously, the new CSI report type and the previous CSI report type can coexist, thereby preventing modifications to the underlying communication standard, which improves efficiency.

[0019] According to one implementation of the first aspect of the invention, instructing the UE to selectively send the report and / or at least one additional report is based on a corresponding control message, particularly a Radio Resource Control (RRC) message or RRC signaling.

[0020] Advantageously, for example, the existing control structure of the underlying communication standard can be used without any modifications, which reduces complexity and thus improves efficiency.

[0021] According to one implementation of the first aspect of the invention, the at least one additional report includes or includes at least one additional Channel State Information (CSI) report.

[0022] Advantageously, for example, the at least one additional report may be at least one previous CSI report type.

[0023] According to one implementation of the first aspect of the invention, the OTFS communication method further includes the step of: preferably, before sending the report, measuring, in particular by the UE, the delay and Doppler shift based on a reference signal in the delay Doppler domain.

[0024] Advantageously, for example, delay and Doppler shift can be obtained in an efficient and accurate manner.

[0025] According to one implementation of the first aspect of the invention, the OTFS communication method further includes the step of: preferably scheduling OTFS resources using, in particular by, the delay and Doppler shift, after sending the report.

[0026] Advantageously, for example, inefficiencies can be further reduced.

[0027] According to one implementation of the first aspect of the invention, the report is transmitted in an OTFS channel or an Orthogonal Frequency-Division Multiplexing (OFDM) channel.

[0028] Advantageously, for example, new CSI report types can be transmitted in OTFS or OFDM channels, thereby increasing flexibility and thus efficiency.

[0029] According to one implementation of the first aspect of the invention, the at least one additional report is transmitted in an OTFS channel or an Orthogonal Frequency Division Multiplexing (OFDM) channel.

[0030] Advantageously, for example, the at least one previous CSI report type can be transmitted in an OTFS channel or an OFDM channel, which improves flexibility and efficiency.

[0031] It should be noted that it is particularly advantageous to transmit the report in the OTFS channel and the at least one additional report in the OFDM channel. Therefore, it is advantageous to transmit the new CSI report type in the OTFS channel and the at least one previous CSI report type in the OFDM channel.

[0032] According to a second aspect of the invention, an OTFS user equipment (UE) is provided, the OTFS UE being configured to send a report including delay and Doppler shift to a base station (BS).

[0033] Advantageously, resource allocation in OTFS operations can be improved in a particularly efficient and reliable manner.

[0034] Regarding the term "OTFS UE", it should be noted that the term can be specifically understood as "UE utilizing OTFS-based communication".

[0035] According to a third aspect of the invention, an OTFS base station (BS) is provided, the OTFS BS being configured to instruct a user equipment (UE) to send a report including delay and Doppler shift.

[0036] Advantageously, resource allocation in OTFS operations can be improved in a particularly efficient and reliable manner.

[0037] Regarding the term "OTFS BS", it should be noted that the term can be specifically understood as "a BS utilizing OTFS-based communication".

[0038] According to one implementation of the third aspect of the invention, the OTFS BS is further configured to instruct the UE to selectively send the report and / or at least one additional report.

[0039] Advantageously, for example, a new CSI report type and / or at least one previous CSI report type can be sent. More advantageously, the new CSI report type and the previous CSI report type can coexist, thereby preventing modifications to the underlying communication standard, which improves efficiency.

[0040] According to a fourth aspect of the present invention, an OTFS communication system is provided. The OTFS communication system includes an OTFS user equipment (UE), particularly an OTFS UE according to a second aspect of the present invention, and an OTFS base station (BS), particularly an OTFS BS according to a third aspect of the present invention or an implementation thereof, wherein the OTFS UE is configured to selectively transmit reports including delay and Doppler shift and / or at least one additional report to the OTFS BS.

[0041] Advantageously, resource allocation in OTFS operations can be improved in a particularly efficient and reliable manner.

[0042] According to a fifth aspect of the invention, an OTFS communication tester is provided, the OTFS communication tester being configured to change the delay and Doppler shift characteristics of an OTFS-based communication channel and monitor corresponding report types, particularly corresponding channel state information (CSI) report types, regarding the OTFS-based communication channel and / or the corresponding OTFS resource scheduling.

[0043] Advantageously, it can effectively verify efficient and reliable resource allocation improvements. Attached Figure Description

[0044] Exemplary embodiments of the invention will now be explained further with reference to the accompanying drawings, by way of example and not limitation. In the drawings:

[0045] Figure 1 A flowchart illustrating an implementation of the OTFS communication method is provided.

[0046] Figure 2 A block diagram illustrating an implementation of an OTFS communication system with OTFS UE and OTFS BS is shown.

[0047] Figure 3 The test results are shown. Figure 2 A block diagram of the implementation method of the OTFS communication tester for the system; and

[0048] Figure 4 An exemplary sequence diagram of OTFS communication between the UE and the BS is shown. Detailed Implementation

[0049] Reference Figure 1 A flowchart illustrating an implementation of an orthogonal time-frequency space (OTFS) communication method for communication between a user equipment (UE) and a base station (BS) is shown.

[0050] From the above Figure 1 As can be seen, the implementation method includes optional steps 101, 102 and 104, as well as mandatory step 103.

[0051] Step 103 of the OTFS communication method includes sending a report, including delay and Doppler shift, to the BS, and in particular, to the UE. Thus, for example, the delay and Doppler shift of a selected channel path can be reported.

[0052] Regarding the aforementioned report, it should be noted that it can be particularly advantageous if the report includes or is a Channel State Information (CSI) report. Therefore, a new CSI report type incorporating delay and Doppler shift can be defined.

[0053] Regarding delay and Doppler shift, it should be noted that it may be particularly advantageous if the delay and Doppler shift includes or relates to the delay and Doppler spectral shift of at least one selected channel and / or at least one fading channel.

[0054] It should also be noted that using the Physical Uplink Control Channel (PUCCH) or the Physical Uplink Shared Channel (PUSCH) to transmit reports can be particularly advantageous. Therefore, either PUCCH or PUSCH can be used to carry new CSI report types.

[0055] As described above, it may be particularly advantageous if the OTFS communication method includes (preferably as a first step 101): before sending the report as a third step 103, instructing, in particular by the BS, the UE to selectively send the report and / or at least one additional report.

[0056] In this context, it can be particularly advantageous if the instruction to the UE to selectively send the report and / or the at least one additional report is based on a corresponding control message, particularly a Radio Resource Control (RRC) message or RRC signaling. Therefore, the base station can advantageously configure the types of CSI report types via RRC signaling.

[0057] Regarding the at least one additional report, it should be noted that it may be particularly advantageous if the at least one additional report includes or includes at least one additional Channel State Information (CSI) report. Therefore, at least one previous CSI report type may also be used.

[0058] Furthermore, as described above, the OTFS communication method may also include the following step (preferably as a second step 102): before sending the report as a third step 103, measuring, in particular by the UE, the delay and Doppler shift based on a reference signal in the delay Doppler domain. For example, the measurement of the delay and Doppler shift may be based specifically on a new reference signal defined in the delay Doppler domain.

[0059] Furthermore, as mentioned above, it can be particularly advantageous if the OTFS communication method further includes the following step (preferably as a fourth step 104): after sending the report as a third step 103, OTFS resources are scheduled using, in particular by the BS, delay and Doppler shift.

[0060] Similarly, regarding this report or the new CSI report type, it should be noted that it can be particularly advantageous if the report or the new CSI report type is transmitted in an OTFS channel or an Orthogonal Frequency Division Multiplexing (OFDM) channel.

[0061] Similarly, regarding at least one additional report or at least one previous CSI report type, it should be noted that it may be particularly advantageous to transmit at least one additional report or at least one previous CSI report type in an OTFS channel or an Orthogonal Frequency Division Multiplexing (OFDM) channel.

[0062] Now, for reference Figure 2 The diagram illustrates a block diagram of an implementation of the OTFS communication system 13. The OTFS communication system 13 includes an OTFS user equipment UE 11 and an OTFS base station BS 12. In this configuration, the OTFS UE 11 is configured to selectively send reports including delay and Doppler shift and / or at least one additional report to the OTFS BS 12.

[0063] Therefore, OTFS UE 11 is configured, at least exemplarily, to send such a report, including delay and Doppler shift, to OTFS BS12. Thus, for example, delay and Doppler shift of a selected channel path can be reported.

[0064] In addition, OTFS BS12 can be configured to at least instruct OTFS UE 11 to send such a report, including delay and Doppler shift.

[0065] Regarding the aforementioned report, it should be noted that it can be particularly advantageous if the report includes or is a Channel State Information (CSI) report. Therefore, a new CSI report type incorporating delay and Doppler shift can be defined.

[0066] Regarding delay and Doppler shift, it should be noted that it may be particularly advantageous if the delay and Doppler shift includes or relates to the delay and Doppler spectral shift of at least one selected channel and / or at least one fading channel.

[0067] It should also be noted that it can be particularly advantageous to use the Physical Uplink Control Channel (PUCCH) or the Physical Uplink Shared Channel (PUSCH) to transmit reports. Therefore, PUCCH or PUSCH can be used, for example by OTFS UE11 and / or OTFS BS12, to carry new CSI report types.

[0068] In cases where the UE is instructed to selectively send a report and / or at least one additional report, it should be noted that it can be particularly advantageous if the UE is instructed to selectively send the report and / or at least one additional report based on the corresponding control message, in particular a Radio Resource Control (RRC) message or RRC signaling. Therefore, advantageously, the OTFS BS12 can configure the types of CSI report types via RRC signaling.

[0069] Regarding at least one additional report, it should be noted that it may be particularly advantageous if the at least one additional report includes or includes at least one additional Channel State Information (CSI) report. Therefore, at least one previous CSI report type may also be used.

[0070] Furthermore, it can be particularly advantageous if the OTFS UE 11 is configured to measure delay and Doppler shift based on a reference signal in the delay-Doppler domain. For example, the measurement of delay and Doppler shift can be based, in particular, on a new reference signal defined in the delay-Doppler domain.

[0071] In addition, it should be noted that it can be particularly advantageous if OTFS BS12 is configured to schedule OTFS resources using delay and Doppler shift.

[0072] Similarly, regarding this report or the new CSI report type, it should be noted that it can be particularly advantageous if the report or the new CSI report type is transmitted in an OTFS channel or an Orthogonal Frequency Division Multiplexing (OFDM) channel.

[0073] Similarly, regarding at least one additional report or at least one prior CSI report type, it should be noted that it may be particularly advantageous if the at least one additional report or the at least one prior CSI report type is transmitted in an OTFS channel or an Orthogonal Frequency Division Multiplexing (OFDM) channel.

[0074] also, Figure 3 An exemplary method for testing is shown. Figure 2 Implementation of the OTFS communication tester 23 (OTFS tester) of the OTFS communication system 13.

[0075] The OTFS communication tester 23 is configured to, for example, alter the delay and Doppler shift characteristics of the OTFS-based communication channel between the OTFS UE 11 and the OTFS BS 12, and monitor the corresponding report types, particularly the corresponding Channel State Information (CSI) report types, regarding the OTFS-based communication channel and / or the corresponding OTFS resource scheduling.

[0076] at last, Figure 4 An exemplary sequence diagram of OTFS communication between a user equipment (UE) (such as OTFS UE 11 above) and a base station (BS) (such as OTFS BS12 above) is shown.

[0077] According to the above Figure 4 In the first step, the BS configures the Channel State Information (CSI) type regarding delay and Doppler shift.

[0078] As can be further seen in the figure, in the second step, the UE measures the delay and Doppler shift based on the new reference signal.

[0079] In addition, in the third step, the UE reports the delay and Doppler shift of the selected channel.

[0080] In addition, in the fourth step, BS uses delay and Doppler shift to schedule OTFS resources.

[0081] While various embodiments of the invention have been described above, it should be understood that they are presented by way of example only and not as limitation. Many changes may be made to the disclosed embodiments based on the disclosure without departing from the spirit or scope of the invention. Therefore, the breadth and scope of the invention should not be limited to any of the embodiments described above. Rather, the scope of the invention should be defined by the appended claims and their equivalents.

[0082] Although the invention has been described and illustrated with respect to one or more implementations, equivalent changes and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. Furthermore, while a particular feature of the invention may be disclosed with respect to only one of several implementations, such feature may be combined with one or more other features of other implementations, which may be desirable and advantageous for any given or particular application.

Claims

1. An orthogonal time-frequency space (OTFS) communication method for communication between a user equipment (UE) and a base station (BS), the OTFS communication method comprising the following steps: Reports including delay and Doppler shift are sent to the BS (103), and in particular by the UE.

2. The OTFS communication method according to claim 1, in, The report includes or may include channel state information reports, and / or The delay and Doppler shift include, or are related to, at least one selected channel and / or at least one fading channel.

3. The OTFS communication method according to claim 1 or 2, in, The report is sent using the physical uplink control channel, or The report is transmitted using a physical uplink shared channel.

4. The OTFS communication method according to any one of claims 1 to 3, wherein, The OTFS communication method also Includes the following steps: Preferably, before sending the report (103), the BS instructs (101), in particular, to instruct the UE to selectively send the report and / or at least one additional report.

5. The OTFS communication method according to claim 4, wherein, The instruction (101) states that the UE selectively sends the report and / or the at least one additional report based on the corresponding control message, in particular a radio resource control message or radio resource control signaling.

6. The OTFS communication method according to claim 4 or 5, wherein, The at least one additional report includes or includes at least one additional channel state information report.

7. The OTFS communication method according to any one of claims 1 to 6, wherein, The OTFS communication method also The steps include: preferably before sending the report (103), measuring (102) the delay and Doppler shift based on a reference signal in the delayed Doppler domain, particularly by the UE.

8. The OTFS communication method according to any one of claims 1 to 7, wherein, The OTFS communication method also The steps include: preferably after sending the report (103), using (104), in particular by the BS, to schedule OTFS resources using the delay and Doppler shift.

9. The OTFS communication method according to any one of claims 1 to 8, wherein, The report is transmitted in an OTFS channel or an orthogonal frequency division multiplexing channel.

10. The OTFS communication method according to any one of claims 4 to 9, wherein, The at least one additional report is transmitted in an OTFS channel or an orthogonal frequency division multiplexing channel.

11. An OTFS user equipment (11) configured to send a report including delay and Doppler shift to a base station (BS).

12. An OTFS base station (12) configured to instruct a user equipment (UE) to send a report including delay and Doppler shift.

13. The OTFS base station (12) according to claim 12, wherein the OTFS base station is further configured to instruct the UE to selectively send the report and / or at least one additional report.

14. An OTFS communication system (13), comprising: OTFS user equipment, particularly OTFS user equipment (11) according to claim 11, and OTFS base stations, particularly OTFS base stations (12) according to claim 12 or 13, The OTFS user equipment (11) is configured to selectively send reports including delay and Doppler shift and / or at least one additional report to the OTFS base station.

15. An OTFS communication tester (23), the OTFS communication tester being configured to: To alter the delay and Doppler shift characteristics of OTFS-based communication channels, and Monitor the corresponding report types regarding the OTFS-based communication channels and / or the corresponding OTFS resource scheduling, especially the corresponding channel status information report types.

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