CN-122029775-A - Downlink control information for scheduling downlink data on physical channels and enhancing control channel decoding

Abstract

The techniques described herein aim to inform user equipment which Physical Downlink Control Channel (PDCCH) locations in slot symbols are allocated for (PDCCH) information. In the case of a user equipment having such allocation information, a base station (e.g., gNodeB) scheduler may schedule unused PDCCH resource element group(s) to the UE for Physical Downlink Shared Channel (PDSCH) decoding. Further, because the allocation pattern is known to the UE, the UE need not blindly scan and decode all potential sets of resource elements in the slot, but only decode PDCCH data in the allocation pattern to find information specific to the UE, thereby continuing PDSCH decoding. The defined identifier located at the predefined symbol position informs the user equipment when PDCCH allocation information exists. If not, the UE blindly decodes all resource element groups as in the current approach to find information specific to the UE to decode PDSCH data.

Inventors

• I. Poltnik
• E. Goldstein
• J. V. Srinivasan
• L. J. Meredan

Assignees

• 戴尔产品有限公司

Dates

Publication Date

20260512

Application Date

20240131

Priority Date

20231012

Claims (20)

1. 1. A user equipment, comprising: Processor, and A memory storing executable instructions that when executed by the processor cause performance of operations comprising: Determining whether resource element group mode allocation information is present in a predefined downlink control information symbol position of a symbol based on a defined physical downlink control channel-radio network temporary identifier obtained from a base station, and In response to determining that the defined physical downlink control channel-radio network temporary identifier is present in the predefined downlink control information symbol position, a candidate resource element group pattern allocation space is identified based on the information within the predefined downlink control information symbol position, and the candidate resource element group pattern allocation space is scanned for downlink control information specific to the user equipment within the resource element group pattern allocation space without scanning for a complete resource element group pattern allocation within the entire possible resource element group pattern allocation space.
2. 2. The user equipment of claim 1, wherein the operations further comprise determining whether the physical downlink control channel symbol is used for physical downlink shared channel allocation in response to determining that the defined physical downlink control channel-radio network temporary identifier is present, and locating at least one resource element group on the physical downlink control channel symbol based on the downlink control information-physical downlink control channel-radio network temporary identifier and the downlink control information, the at least one resource element group not being used for resource element group mode allocation data and comprising resource blocks occupied by physical downlink shared channel data that are specific to the user equipment in response to determining that the physical downlink control channel symbol is used for physical downlink shared channel allocation.
3. 3. The user equipment of claim 1, wherein determining whether the defined physical downlink control channel-radio network temporary identifier is present in the predefined downlink control information symbol position comprises attempting to decode downlink control information as information directed to the user equipment.
4. 4. The user equipment of claim 1, wherein the operations further comprise performing rate matching and physical downlink shared channel decoding with the physical downlink shared channel resource blocks to decode downlink shared channel data.
5. 5. The user equipment of claim 1, wherein the predefined downlink control information symbol positions comprise control channel elements located at predefined positions within the symbol.
6. 6. The user equipment of claim 1, wherein the predefined downlink control information symbol position within the symbol corresponds to a lowest position within the symbol.
7. 7. The user equipment of claim 1, wherein a fixed aggregation level is defined for predefined downlink control information for the predefined downlink control information symbol positions.
8. 8. The user equipment of claim 1, wherein the predefined downlink control information symbol positions comprise control channel elements at predefined positions within the symbol, and wherein a fixed aggregation level is defined for predefined downlink control information of the predefined downlink control information symbol positions.
9. 9. The user equipment of claim 1, wherein the operations further comprise performing blind decoding of the entire possible resource element group space to determine user equipment-specific physical downlink control channel information in response to determining that the defined physical downlink control channel-radio network temporary identifier is not present in the predefined downlink control information symbol positions.
10. 10. The user equipment of claim 1, wherein the base station comprises gNodeB.
11. 11. A method, comprising: inserting, by a radio device comprising a processor, a defined identifier into a symbol at a physical downlink control channel symbol position, and The symbols are transmitted by the radio to a receiving user equipment as part of a physical downlink control channel communication.
12. 12. The method of claim 11, further comprising adding, by the radio, information describing resource element group pattern allocation space applicable to a specified user equipment to the symbol at the symbol position.
13. 13. The method of claim 11, wherein the designated user equipment is a first user equipment, wherein the information is first information, wherein the resource element group mode allocation space is a first resource element group mode allocation space, and further comprising adding, by the radio, to the symbol at the symbol position, second information describing a second resource element group mode allocation space applicable to a second user equipment, the second resource element group mode allocation space being different from the first resource element group mode allocation space.
14. 14. The method of claim 11, further comprising determining, by the radio, unused resource element group space within the symbol and allocating, by the radio, the unused resource element group space for physical downlink shared channel data scheduling.
15. 15. The method of claim 11, wherein the defined identifier radio network temporary identifier is common to any of the receiving user devices, and wherein transmitting the symbol as part of the physical downlink control channel communication comprises broadcasting the symbol to the receiving user devices as part of a time slot.
16. 16. The method of claim 11 wherein the symbol at the symbol position is in a first slot and the method further comprises determining, by the radio, not to insert the defined identifier into a second symbol of a second slot.
17. 17. A non-transitory machine-readable medium comprising executable instructions that, when executed by a processor of a user device, cause performance of operations comprising: scanning symbols of a slot received via transmission from a base station to determine whether the symbols include a defined identifier at predefined downlink control channel symbol positions, and In response to determining that the symbol includes the defined identifier at the predefined downlink control channel symbol position, a subset of a resource element group pattern allocation space for downlink control information is determined based on information in the predefined symbol position, and the subset of the resource element group pattern allocation space is scanned to obtain downlink control information specific to the user equipment within the resource element group pattern allocation space without scanning for an entire resource element group pattern allocation within a possible resource element group pattern allocation space.
18. 18. The non-transitory machine-readable medium of claim 17, wherein the operations further comprise performing blind decoding of an entire possible resource element group space to determine user equipment-specific physical downlink control channel information in response to determining that the defined identifier is not present in the predefined downlink control channel symbol positions.
19. 19. The non-transitory machine-readable medium of claim 17, wherein the operations further comprise determining whether a physical downlink control channel symbol is used for physical downlink shared channel allocation in response to determining that the defined identifier is present in the predefined downlink control channel symbol position, and locating at least one resource block occupied by physical downlink shared channel data that is specific to the user equipment within the symbol in response to determining that the physical downlink control channel symbol is used for physical downlink shared channel allocation.
20. 20. The non-transitory machine-readable medium of claim 19, wherein the operations further comprise obtaining physical downlink shared channel data from the at least one resource block, including performing rate matching and physical downlink shared channel decoding.

Description

Downlink control information for scheduling downlink data on physical channels and enhancing control channel decoding Cross Reference to Related Applications The present application claims priority from U.S. non-provisional patent application Ser. No. 18/485750, filed on Ser. No. "DOWNLINK CONTROL INFORMATION TO SCHEDULE DOWNLINK DATA ON PHYSICAL CHANNEL AND ENHANCE CONTROL CHANNEL DECODING", 10/12 of 2023, the entire contents of which are incorporated herein by reference. Background In new radios (e.g., 5 th generation (5G) systems and beyond), two primary channels are used in the downlink to transmit data to User Equipment (UE), namely, a Physical Downlink Control Channel (PDCCH) and a Physical Data Shared Channel (PDSCH). The PDCCH is used to transmit position data in time and frequency and also to convey other parameters related to decoding the PDSCH. In general, PDSCH contains actual data of UE. More specifically, the UE decodes the PDCCH data to obtain allocation pattern and configuration data, and the UE uses this information to decode the PDSCH channel to obtain the payload. The PDCCH employs blind decoding (e.g., according to a standard), and resource blocks are combined into resource element groups (resource block groups). Based on the aggregation level, multiple resource element groups are used to transmit PDCCH data. More specifically, the UE scans all resource element groups and all aggregation levels to decode data specific to the UE using a Radio Network Temporary Identifier (RNTI) assigned to the UE. The UE also decodes data for the common RNTI, that is, data common to the UE and other UEs, e.g., system information block 1 (SIB), paging, broadcast messages, etc. It is time consuming and resource consuming for a UE to scan and decode all resource element groups and utilize all aggregation levels within a PDCCH symbol to find any matching data for the UE's specific RNTI and common RNTI. Drawings The technology described herein is illustrated by way of example and not limited by the accompanying figures, in which like references indicate similar elements, and in which: Fig. 1 is an example block diagram representation of an example system/architecture in which a radio device transmits Downlink Control Information (DCI) in a slot, the DCI including predefined DCI within a slot symbol that contains resource group occupancy data for a particular user device, in accordance with various aspects and embodiments of the present disclosure. Fig. 2 is a representation of an example data structure in which physical downlink control information including a radio network temporary identifier indicating the presence of predefined DCI within a slot symbol may be transmitted, in accordance with various aspects and embodiments of the present disclosure. Fig. 3 is a representation of an example resource allocation pattern in the presence of predefined DCI within a slot symbol in accordance with various aspects and embodiments of the present disclosure. Fig. 4 is a representation of another example resource allocation pattern based on the presence of predefined DCI within a slot symbol, according to various aspects and embodiments of the present disclosure. Fig. 5 and 6 include flowcharts illustrating example operations related to user equipment operations related to DCI decoding in accordance with various aspects and embodiments of the present disclosure. Fig. 7 is a flowchart illustrating example operations related to scanning candidate resource element group pattern allocation space based on the presence of a defined identifier in a predefined downlink control information symbol position to obtain user equipment-specific downlink control information, in accordance with various aspects and embodiments of the present disclosure. Fig. 8 is a flow diagram illustrating example operations related to a radio inserting a defined identifier into a symbol located at a physical downlink control channel symbol location and transmitting the symbol as part of physical downlink control channel communications in accordance with various aspects and embodiments of the present disclosure. Fig. 9 is a flowchart illustrating example operations related to determining a subset of resource element group mode allocation space for downlink control information based on information in predefined symbol positions and scanning the subset of resource element group mode allocation space to obtain user equipment-specific downlink control information, in accordance with various aspects and embodiments of the present disclosure. FIG. 10 is a block diagram representing an example computing environment in which aspects of the subject matter described herein may be incorporated. FIG. 11 depicts an example schematic block diagram of a computing environment in which the disclosed subject matter can be at least partially interacted with/implemented with, in accordance with various aspects and embodiments of the disclosure. Detailed Description Variou