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CN-122001715-A - Communication method and communication device

CN122001715ACN 122001715 ACN122001715 ACN 122001715ACN-122001715-A

Abstract

The application provides a communication method and a communication device. The method comprises the steps of enabling the RIS to receive a first reference signal sent by a first communication device based on a first time domain resource, enabling the RIS to reflect the first reference signal to a second communication device based on a first phase, enabling the RIS to receive a second reference signal sent by the first communication device based on a second time domain resource, enabling the first time domain resource to be identical to the second time domain resource in time domain length, enabling the first reference signal to be identical to the second reference signal, enabling the RIS to reflect the second reference signal to the second communication device based on a second phase, and enabling the second phase to be opposite to the first phase. The first and second reference signals may be used for measurement of direct channels (i.e., channels between the first and second communication devices) and/or partially concatenated channels (i.e., channels between the first communication device and the RIS). By designing the transmission rule of the reference signal and the phase of the RIS reflected reference signal, independent estimation of the direct channel or the partial cascade channel can be realized.

Inventors

  • LIU YONG
  • Pan Cunhua
  • ZHANG TAIHAO
  • REN HONG
  • Deng Ruoqi

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260508
Application Date
20241106

Claims (20)

  1. 1. A communication method applied to a configurable intelligent surface RIS device, the method comprising: Receiving a first reference signal from a first communication device based on a first time domain resource; reflecting the first reference signal to a second communication device based on a first phase; receiving a second reference signal from the first communication device based on a second time domain resource, the first time domain resource and the second time domain resource being the same in time domain length, the first reference signal and the second reference signal being the same; Reflecting the second reference signal to the second communication device based on a second phase, the second phase being opposite the first phase; Wherein the first reference signal and the second reference signal are used for measurement of a first channel and/or a second channel, the first channel being a channel between the first communication device and the second communication device, the second channel being a channel between the first communication device and the RIS device.
  2. 2. The method according to claim 1, wherein the method further comprises: Receiving third reference signals from the first communication device based on F groups of time domain resources, each group of time domain resources in the F groups of time domain resources comprising a number of time domain units, the third reference signals on a number of time domain units in one group of time domain resources being identical, the third reference signals on different groups of time domain resources being different, a being an integer greater than 1, F being an integer greater than 1; Reflecting the third reference signal to the second communication device based on B phases, the B phases being for each of the F sets of time domain resources, and the correspondence of the B phases to the a time domain units being the same in each set of time domain resources, the third reference signal being used with the first reference signal and the second reference signal for measurement of a third channel, the third channel being a channel between the second communication device and the RIS device, B being an integer greater than or equal to 1 and less than or equal to a.
  3. 3. The method of claim 2, wherein the step of determining the position of the substrate comprises, And the value of F is larger than or equal to the number of paths corresponding to the second channel.
  4. 4. A method according to claim 2 or 3, characterized in that, The value of A is related to the number of array elements of the RIS device.
  5. 5. The method according to any one of claim 2 to 4, wherein, The value of A is larger than or equal to log (W), or the value of A is larger than or equal to log (W)/L; and L is the number of paths corresponding to the third channel, and W is the number of array elements of the RIS device.
  6. 6. The method according to any one of claims 2 to 5, further comprising: And receiving first indication information, wherein the first indication information indicates at least one of the value of F, the value of A and the position of the F group time domain resource.
  7. 7. The method according to any one of claims 1 to 6, further comprising: second indication information is received, the second indication information indicating at least one of a length of the first time domain resource, a location of the first time domain resource, a length of the second time domain resource, and a location of the second time domain resource.
  8. 8. A communication method applied to a second communication device, the method comprising: receiving a first reference signal from a first communication device based on a first time domain resource and based on a first phase reflection by a configurable smart surface RIS device; Receiving a second reference signal from the first communication device based on a second time domain resource and reflected by the RIS device based on a second phase, the second phase being opposite the first phase, the first time domain resource and the second time domain resource being the same in time domain length, the first reference signal and the second reference signal being the same; And acquiring channel information of a first channel and/or a second channel according to the first reference signal and the second reference signal, wherein the first channel is a channel between the first communication device and the second communication device, and the second channel is a channel between the first communication device and the RIS device.
  9. 9. The method of claim 8, wherein the method further comprises: receiving a third reference signal from the first communication device based on F sets of time domain resources and reflected by the RIS device based on B phases for each of the F sets of time domain resources, and the correspondence of the B phases with the a time domain units being the same in each set of time domain resources, Wherein each of the F groups of time domain resources includes a number of time domain units, third reference signals on a number of a time domain units in one group of time domain resources are the same, third reference signals on different groups of time domain resources are different, a and F are integers greater than 1, and B is an integer greater than 1 or equal to 1 and less than a or equal to a; And acquiring channel information of a third channel according to the third reference signal, the first reference signal and the second reference signal, wherein the third channel is a channel between the second communication device and the RIS device.
  10. 10. The method of claim 9, wherein the obtaining channel information for a third channel based on the third reference signal, the first reference signal, and the second reference signal comprises: and acquiring channel information of a third channel according to the third reference signal, the first reference signal, the second reference signal and the reference channel information.
  11. 11. A communication method applied to a first communication device, comprising: transmitting a first reference signal to a second communication device through a configurable intelligent surface RIS device based on a first time domain resource, wherein the first reference signal corresponds to a first phase; Transmitting a second reference signal to the second communication device through the RIS device based on a second time domain resource, wherein the second reference signal corresponds to a second phase, the second phase is opposite to the first phase, the time domain lengths of the first time domain resource and the second time domain resource are the same, and the first reference signal and the second reference signal are the same; Wherein the first reference signal and the second reference signal are used for measurement of a first channel and/or a second channel, the first channel being a channel between the first communication device and the second communication device, the second channel being a channel between the first communication device and the RIS device.
  12. 12. The method of claim 11, wherein the method further comprises: Transmitting, by the RIS device, a third reference signal to the second communication device based on the F sets of time domain resources, the third reference signal and the first reference signal and the second reference signal being used for measurement of a third channel, the third channel being a channel between the second communication device and the RIS device; Wherein the third reference signal corresponds to B phases, the B phases are used for each group of time domain resources in the F groups of time domain resources, and the correspondence between the B phases and the a time domain units is the same in each group of time domain resources; Each of the F groups of time domain resources includes a time domain units, third reference signals on the a time domain units in one group of time domain resources are the same, third reference signals on different groups of time domain resources are different, a and F are integers greater than 1, and B is an integer greater than 1 or equal to 1 and less than a or equal to a.
  13. 13. The method according to any one of claims 9, 10, 12, wherein, And the value of F is larger than or equal to the number of paths corresponding to the second channel.
  14. 14. The method according to any one of claims 9, 10, 12, 13, The value of A is related to the number of array elements of the RIS device.
  15. 15. The method of any one of claim 9, 10, 12, 13, 14, The value of A is larger than or equal to log (W), or the value of A is larger than or equal to log (W)/L; and L is the number of paths corresponding to the third channel, and W is the number of array elements of the RIS device.
  16. 16. The method of any one of claims 9, 10, 12, 13, 14, 15, further comprising: and sending or receiving first indication information, wherein the first indication information indicates at least one of the value of F, the value of A and the position of the F group time domain resource.
  17. 17. The method according to any one of claims 1 to 16, wherein, The first time domain resource and the second time domain resource are contiguous time domain resources.
  18. 18. The method according to any one of claims 1 to 17, wherein, The time domain length of the first time domain resource and the second time domain resource is associated with at least one of a number of ports of the first communication device, a number of paths corresponding to the first channel, and a number of paths corresponding to the second channel.
  19. 19. The method according to any one of claims 1 to 18, wherein, The time domain lengths of the first time domain resource and the second time domain resource satisfy: T≥max{I·log(Q),J·log(Q)}; Wherein T represents the time domain length of the first time domain resource and the second time domain resource, I represents the number of paths corresponding to the first channel, J represents the number of paths corresponding to the second channel, and Q represents the number of ports of the first communication device.
  20. 20. The method according to any one of claims 1 to 19, further comprising: And transmitting or receiving second indication information, wherein the second indication information indicates at least one of the length of the first time domain resource, the position of the first time domain resource, the length of the second time domain resource and the position of the second time domain resource.

Description

Communication method and communication device Technical Field The present application relates to the field of communications, and more particularly, to a communication method and a communication apparatus. Background Multiple-input multiple-output (MIMO) systems can utilize space-dimensional resources, and on the premise of not increasing the system bandwidth, the signals can obtain array gain, multiplexing and diversity gain and interference cancellation gain in space, thereby doubling the capacity and spectrum efficiency of the communication system. However, with the increasing demands for high-rate, high reliability, low latency, etc., modern communication systems will continue to face challenges of greater capacity, wider coverage, and lower latency. To address the challenges described above, configurable smart surfaces (reconfigurable intelligent surface, RIS) are beginning to be widely studied as a potential technology. How to perform channel estimation for the RIS-aided MIMO system is a considerable problem. Disclosure of Invention The application provides a communication method and a communication device, which can realize channel estimation of an RIS auxiliary MIMO system, realize channel estimation of a direct channel of the RIS auxiliary MIMO system, and/or realize channel estimation of a cascade channel of the RIS auxiliary MIMO system. In a first aspect, a communication method is provided that may be performed by a communication device (e.g., a RIS device). The communication device may be an RIS device, or may be a component (such as a chip or a circuit, may be a modem (modem) chip, also called a baseband (baseband) chip, or a system on chip (SoC) or a system in package (SYSTEM IN PACKAGE, SIP) chip containing a modem core, or may be a logic module or software capable of implementing part or all of the functions of the RIS device, or the like, which is not limited in this application. The following description will take an RIS device as an example. The method may include receiving a first reference signal from a first communication device based on a first time domain resource, reflecting the first reference signal to a second communication device based on a first phase, receiving a second reference signal from the first communication device based on a second time domain resource, the first and second time domain resources being the same in time domain length, the first and second reference signals being the same, reflecting the second reference signal to the second communication device based on a second phase, the second phase being opposite the first phase, wherein the first and second reference signals are used for measurement of a first channel and/or a second channel, the first channel being a channel between the first and second communication devices, the second channel being a channel between the first and RIS devices. Based on the above technical solution, the RIS device may receive the reference signal repeatedly sent by the first communication device on two time domain resources with the same length, and reflect the reference signal on the two time domain resources with an inverted phase when reflecting the reference signal to the second communication device. Thus, by designing the transmission rule of the reference signal and the phase of the RIS reflected reference signal, the channel estimation of the direct channel or the partial cascade channel can be realized. For example, the second communication device may process (e.g. add the reference signals on the two time domain resources), and since phases of the reference signals on the two time domain resources reflected by the RIS are inverted, that is, phases of the reference signals on the two time domain resources on the cascade channel are inverted, the effect of the cascade channel on the direct channel estimation may be reduced by adding the reference signals with opposite phases, so that independent estimation of the direct channel and the cascade channel is achieved. With reference to the first aspect, in certain implementations of the first aspect, the method further includes receiving a third reference signal from the first communication device based on F sets of time domain resources, each of the F sets of time domain resources including a time domain units, the third reference signal on a time domain units in one set of time domain resources being the same, the third reference signal on a different set of time domain resources being different, a being an integer greater than 1, F being an integer greater than 1, reflecting the third reference signal to the second communication device based on B phases for each of the F sets of time domain resources, and the correspondence of the B phases with the a time domain units being the same in each set of time domain resources, the third reference signal being a channel between the second communication device and the RIS device and the second reference signal being a measurement of