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CN-122027105-A - Resource determination method and communication device for demodulation reference signal (DMRS)

CN122027105ACN 122027105 ACN122027105 ACN 122027105ACN-122027105-A

Abstract

The embodiment of the application provides a resource determination method and a communication device for demodulation reference signal (DMRS). The method includes determining a first time domain resource. Here, the first time domain resource includes at least two consecutive sub-time domain resources, the at least two sub-time domain resources are time domain resources in at least two adjacent first time units, and the at least two sub-time domain resources are in one-to-one correspondence with the at least two adjacent first time units. The sum of the lengths of the at least two sub-time domain resources is equal to the length of the first time domain resource. And determining the configuration of the time domain resources of the DMRS in the at least two sub-time domain resources according to the length of the first time domain resources. By adopting the method provided by the application, the problems of excessive number of the DMRS on the first time domain resource and the like possibly caused when the time domain resources of the DMRS are respectively configured for at least two sub time domain resources can be avoided, and the distribution of the DMRS on the whole first time domain resource can be ensured to be uniform.

Inventors

  • YU YAWEI
  • GUO ZHIHENG
  • XIE XINQIAN

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260512
Application Date
20201016

Claims (20)

  1. 1. A method for determining resources of a demodulation reference signal DMRS, the method comprising: the method comprises the steps that first communication equipment determines first time domain resources, wherein the first time domain resources comprise at least two continuous sub-time domain resources, the at least two sub-time domain resources are time domain resources in at least two adjacent first time units, the at least two sub-time domain resources are in one-to-one correspondence with the at least two adjacent first time units, and the sum of the lengths of the at least two sub-time domain resources is equal to the length of the first time domain resources; The first communication device determines DMRS resource indication information corresponding to a first time domain resource according to the length of the first time domain resource, the maximum allowed number of additional DMRS corresponding to the first time domain resource, and a DMRS resource mapping set, and determines configuration of time domain resources of DMRS in the at least two sub-time domain resources according to the DMRS resource indication information, where the DMRS resource indication information is used to indicate a position of the time domain resources of the DMRS in the at least two sub-time domain resources in the first time domain resource, and the DMRS resource mapping set includes one or more lengths with different values, the maximum allowed number of additional DMRS with one or more different values, and DMRS resource indication information corresponding to the length with any value and the maximum allowed number of additional DMRS with any value.
  2. 2. The method of claim 1, prior to the first communication device determining the configuration of the time domain resources of the DMRS in the at least two sub-time domain resources according to the length of the first time domain resource, the method further comprising: The first communication device determines that a ratio between a length of a first configuration resource and a length of a second configuration resource is equal to or greater than a preset ratio, wherein the first configuration resource is a time domain resource of the DMRS in the at least two sub-time domain resources determined according to the lengths of the at least two sub-time domain resources, and the second configuration resource is a time domain resource of the DMRS in the at least two sub-time domain resources determined according to the length of the first time domain resource.
  3. 3. The method according to claim 2, wherein the method further comprises: If the first communication device determines that the ratio between the length of the first configuration resource and the length of the second configuration resource is smaller than the preset ratio, the first communication device determines the configuration of the time domain resource of the DMRS in the at least two sub-time domain resources according to the lengths of the at least two sub-time domain resources respectively.
  4. 4. The method of claim 1, wherein prior to the first communication device determining the configuration of the time domain resources of the DMRS in the at least two sub-time domain resources based on the length of the first time domain resource, the method further comprises: the first communication device determines that at least one first sub-time domain resource is included in the at least two sub-time domain resources, wherein the length of the first sub-time domain resource is smaller than or equal to a first threshold value, or a transmission code rate corresponding to the first sub-time domain resource is equal to or greater than a preset transmission code rate.
  5. 5. The method of claim 4, wherein the first threshold is determined by a length of the first time domain resource.
  6. 6. The method according to claim 4 or 5, characterized in that the method further comprises: if the first communication device determines that the at least two sub-time domain resources do not include the first sub-time domain resource, the first communication device determines the configuration of the time domain resource of the DMRS in the at least two sub-time domain resources according to the lengths of the at least two sub-time domain resources.
  7. 7. The method of claim 1, wherein prior to the first communication device determining the configuration of the time domain resources of the DMRS in the at least two sub-time domain resources based on the length of the first time domain resource, the method further comprises: The first communication device determines that a minimum interval of DMRS corresponding to a first configuration resource is smaller than or equal to a preset interval, wherein the first configuration resource is a time domain resource of DMRS in the at least two sub-time domain resources determined according to lengths of the at least two sub-time domain resources, and the minimum interval of DMRS corresponding to the first configuration resource is an offset of a second time unit between two DMRS closest to each other in at least two DMRS carried on the first configuration resource.
  8. 8. The method of claim 7, wherein the method further comprises: If the first communication device determines that the minimum interval of the DMRS is greater than the preset interval, the first communication device determines the configuration of the time domain resources of the DMRS in the at least two time domain resources according to the lengths of the at least two time domain resources.
  9. 9. The method of claim 1, wherein prior to the first communication device determining the configuration of the time domain resources of the DMRS in the at least two sub-time domain resources based on the length of the first time domain resource, the method further comprises: The first communication device receives first indication information from the second communication device, where the first indication information is used to instruct the first communication device to perform a step of determining a configuration of a time domain resource of the DMRS in the at least two sub-time domain resources according to a length of the first time domain resource.
  10. 10. The method according to any of claims 1-9, wherein after the first communication device determines the configuration of the time domain resources of the DMRS in the at least two sub-time domain resources according to the length of the first time domain resource, the method further comprises: the first communication device performs at least two signaling on the at least two sub-time domain resources.
  11. 11. The method of claim 10, wherein the first communication device signaling at least two times over the at least two sub-time domain resources comprises: the first communication equipment performs signal transmission to the second communication equipment at least twice according to preset transmission conditions and through the at least two sub-time domain resources respectively; The preset sending conditions comprise at least one of the following steps that the sending power adopted by each signal sending is the same, the precoding adopted by each signal sending is the same, and the antenna ports adopted by each signal sending are the same.
  12. 12. The method of claim 11, wherein before the first communication device performs at least two signal transmissions to the second communication device according to the preset transmission condition and through the at least two sub-time domain resources, respectively, the method further comprises: The first communication device determines that at least one second sub-domain resource is included in the at least two sub-time domain resources, wherein DMRS is not configured on each second sub-domain resource in the at least one second sub-domain resource.
  13. 13. The method according to any of claims 1-8, wherein after the first communication device determines the configuration of the time domain resources of the DMRS in the at least two sub-time domain resources according to the length of the first time domain resource, the method further comprises: the first communication device sends second indication information to a second communication device, where the second indication information is used to instruct the second communication device to determine a configuration of a time domain resource of the DMRS in the at least two sub-time domain resources according to the length of the first time domain resource.
  14. 14. The method according to any of claims 1-8 or 13, wherein after the first communication device determines the configuration of the time domain resources of the DMRS in the at least two sub-time domain resources according to the length of the first time domain resource, the method further comprises: The first communication device performs at least two signal receptions over the at least two sub-time domain resources.
  15. 15. The method of claim 14, wherein the first communication device receiving signals at least twice over the at least two sub-time domain resources comprises: The first communication device demodulates and decodes the at least two signal receptions on the at least two sub-time domain resources according to all DMRSs on the first time domain resource.
  16. 16. The method according to any of claims 1-15, wherein the first time unit is a time slot and the second time unit is a time domain symbol.
  17. 17. A communication device, the communication device comprising: A processing unit, configured to determine a first time domain resource, where the first time domain resource includes at least two consecutive sub-time domain resources, the at least two sub-time domain resources are time domain resources in at least two adjacent first time units, the at least two sub-time domain resources are in one-to-one correspondence with the at least two adjacent first time units, and a sum of lengths of the at least two sub-time domain resources is equal to a length of the first time domain resource; The processing unit is further configured to determine DMRS resource indication information corresponding to a first time domain resource according to the length of the first time domain resource, the maximum allowed number of additional DMRS corresponding to the first time domain resource, and a DMRS resource mapping set, and determine configuration of time domain resources of DMRS in the at least two sub-time domain resources according to the DMRS resource indication information, where the DMRS resource indication information is used to indicate a position of the time domain resources of the DMRS in the at least two sub-time domain resources in the first time domain resource, and the DMRS resource mapping set includes one or more lengths with different values, the maximum allowed number of additional DMRS with one or more different values, and DMRS resource indication information corresponding to the length with any value and the maximum allowed number of additional DMRS with any value.
  18. 18. The communication device of claim 17, wherein the processing unit is further configured to: Determining that a ratio between a length of a first configuration resource and a length of a second configuration resource is equal to or greater than a preset ratio, wherein the first configuration resource is a time domain resource of the DMRS in the at least two sub-time domain resources determined according to the lengths of the at least two sub-time domain resources, and the second configuration resource is a time domain resource of the DMRS in the at least two sub-time domain resources determined according to the length of the first time domain resource.
  19. 19. The communication device of claim 18, wherein the processing unit is further configured to: if it is determined that the ratio between the length of the first configuration resource and the length of the second configuration resource is smaller than the preset ratio, determining the configuration of the time domain resource of the DMRS in the at least two time domain resources according to the lengths of the at least two time domain resources.
  20. 20. The communication device of claim 17, wherein the processing unit is further configured to: And determining that the at least two sub-time domain resources comprise at least one first sub-time domain resource, wherein the length of the first sub-time domain resource is smaller than or equal to a first threshold value, or the transmission code rate corresponding to the first sub-time domain resource is equal to or greater than a preset transmission code rate.

Description

Resource determination method and communication device for demodulation reference signal (DMRS) The present application is a divisional application, the application number of the original application is 202080106145.3, the original application date is 10 months 16 days in 2020, and the whole content of the original application is incorporated by reference into the present application. Technical Field The present application relates to the field of wireless communications, and in particular, to a method and a communication device for determining resources of a demodulation reference signal DMRS. Background With the development of mobile communication technology, a fifth generation (the fifth-generation, 5G) mobile communication technology (also called New Radio (NR)) has been proposed. In practical applications, services of the 5G technology are very diverse, such as enhanced mobile broadband (enhanced mobile broadband, eMBB) oriented services, ultra-reliable low-latency communication (ultra-latency low-latency communication, URLLC) services, and large-scale machine communication (MASSIVE MACHINE-type communication, mMTC) services. In the existing 5G communication technology, a transmitting end is usually allowed to repeatedly transmit data so that a receiving end can obtain a combining gain, thereby improving the transmission quality of the data. In the current NR protocol, a repeated transmission mechanism of type B (i.e., type B) is specified, that is, in the L repeated transmission processes, L repeated transmission transmissions are performed on a plurality of consecutive time domain symbols according to the number of time domain symbols required for each repeated transmission based on the position of the starting time domain symbol of the first repeated transmission in the L repeated transmissions. In addition, in the current NR protocol, if the time domain resources required for a certain repetition transmission (i.e., all time domain symbols occupied by the repetition transmission) are distributed in two different time slots, the time domain resources corresponding to the repetition transmission should be split into two sub-time domain resources according to the boundaries of the two different time slots, and the two sub-time domain resources are respectively subjected to two repetition transmissions, and the size of the transmission block of the split two repetition transmissions remains unchanged. Therefore, when the transmitting end allocates the time domain resources of the demodulation reference signal (demodulation REFERENCE SIGNAL, DMRS) for the multiple repeated transmissions after a certain repeated transmission is split into two repeated transmissions according to the slot boundary, the transmitting end also directly allocates the time domain resources of the DMRS for the two sub-time domain resources respectively. However, the time domain resources of the DMRS are directly allocated to the sub-time domain resources, so that the situation that the number of the time domain resources of the finally allocated DMRS is excessive or the position distribution is unreasonable is more likely to occur, thereby reducing the spectrum efficiency and the channel estimation performance in the communication process. Disclosure of Invention The application provides a resource determination method and a communication device of a demodulation reference signal (DMRS). By the method provided by the application, the situation that the time domain resource allocation of the DMRS is unreasonable caused by respectively allocating the time domain resources of the DMRS to at least two sub-time domain resources included in a certain time domain resource can be reduced or avoided, so that the frequency spectrum efficiency and the channel estimation performance in the communication process are improved. In a first aspect, an embodiment of the present application provides a method for determining resources of a demodulation reference signal DMRS. The execution subject of the method may be a first communication device, which may be a terminal device or a chip located in the terminal device, and the first communication device may be a network device or a chip located in the network device. The first communication device determines a first time domain resource, wherein the first time domain resource comprises at least two continuous sub-time domain resources, the at least two sub-time domain resources are time domain resources in at least two adjacent first time units, and the at least two sub-time domain resources are in one-to-one correspondence with the at least two adjacent first time units. The sum of the lengths of the at least two sub-time domain resources is equal to the length of the first time domain resource, wherein the length of the time domain resource is the number of second time units included in the time domain resource. The first communication device determines a configuration of a time domain resource of