EP-3952538-B1 - COMMUNICATION METHOD, DEVICE AND SYSTEM

Inventors

• HUA, MENG
• WU, HAI
• LONG, Yi

Dates

Publication Date

20260513

Application Date

20200327

Claims (10)

1. A communication method, wherein the method comprises: receiving (S501), by a terminal device, configuration information from a network device; receiving (S502), by the terminal device, downlink control information from the network device; determining (S504), by the terminal device, a first resource based on the configuration information, wherein the first resource is a resource that cannot be used to transmit a downlink data channel and a demodulation reference signal of the downlink data channel; wherein the configuration information comprises indication information of a frequency domain resource in the first resource and indication information of a time domain resource in the first resource; determining (S505), by the terminal device, a second resource based on the downlink control information, wherein the second resource comprises a resource used to transmit the downlink data channel and the demodulation reference signal of the downlink data channel; determining (S506), by the terminal device, a third resource based on the first resource and the second resource, wherein the third resource is a resource that is in the second resource and that is used to transmit the downlink data channel and the demodulation reference signal of the downlink data channel; and receiving (S507), by the terminal device on the third resource, the downlink data channel and the demodulation reference signal of the downlink data channel from the network device.
2. The method according to claim 1, wherein the indication information of the time domain resource is used to indicate that the time domain resource in the first resource comprises all time domain resources within a validity period of the first resource; wherein the time domain resources comprise time domain symbols; wherein the first resource is within the validity period after the configuration information is configured, and the first resource is not within the validity period when the configuration information is deleted.
3. The method according to claim 1 or 2, wherein the configuration information comprises M rate match patterns, and M is a positive integer less than or equal to a first set value.
4. The method according to claim 3, wherein a first rate match pattern in the M rate match patterns comprises S segments of frequency domain resources, and S is a positive integer less than or equal to a second set value.
5. The method according to any one of claims 1 to 4, wherein the frequency domain resource in the first resource is N segments of frequency domain resources, and N is a positive integer less than or equal to a third set value.
6. The method according to any one of claims 1 to 5, wherein the downlink data channel has a mapping type of type A.
7. The method according to any one of claims 1 to 5, wherein the downlink data channel has a mapping type of type B, and a duration of the time domain resource of the downlink data channel is a fourth set value.
8. A communication method, wherein the method comprises: sending (S501), by a network device, configuration information to a terminal device, wherein the configuration information is used to determine a first resource, and the first resource is a resource that cannot be used to transmit a downlink data channel and a demodulation reference signal of the downlink data channel; wherein the configuration information comprises indication information of a frequency domain resource in the first resource and indication information of a time domain resource in the first resource; sending (S502), by the network device, downlink control information to the terminal device, wherein the downlink control information is used to determine a second resource, and the second resource comprises a resource used to transmit the downlink data channel and the demodulation reference signal of the downlink data channel; determining (S503), by the network device, a third resource based on the first resource and the second resource, wherein the third resource is a resource that is in the second resource and that is used to transmit the downlink data channel and the demodulation reference signal of the downlink data channel; and transmitting (S507), by the network device on the third resource, the downlink data channel and the demodulation reference signal of the downlink data channel to the terminal device.
9. A terminal device, which is configured to perform the method according to any one of claims 1 to 7.
10. A network device, which is configured to perform the method according to claim 8.

Description

TECHNICAL FIELD This application relates to the field of communication technologies, and in particular, to a communication method, device, and system. BACKGROUND In an existing new radio (new radio, NR) system, a minimum frequency domain scheduling granularity of a physical downlink data channel (physical downlink shared channel, PDSCH) is a plurality of resource blocks (resource block, RB). For example, when a frequency domain resource scheduling type of the PDSCH is a type 0 (type 0), the minimum frequency domain scheduling granularity of the PDSCH is a resource block group (resource block group, RBG). In addition, some time-frequency resources that cannot be used to transmit the PDSCH are further defined in the NR system. If the time-frequency resources intersect a time-frequency resource block determined by a terminal device based on downlink control information (downlink control information, DCI), time-frequency resources that intersect the time-frequency resource block are not used to transmit the PDSCH. In addition, to avoid complexity of channel estimation, the protocol specifies that the terminal device is not expected to handle a case in which a demodulation reference signal (demodulation reference signal, DMRS) of the PDSCH overlaps or even partially overlaps with the resources that cannot be used to transmit the PDSCH (a UE is not expected to handle the case where PDSCH DMRS REs are overlapping, even partially, with any REs not available for PDSCH). However, as shown in FIG. 1a, if resources of N RBs defined by the NR system in one RBG cannot be used to transmit the PDSCH, and the entire RBG is not scheduled, other RB resources in the RBG other than the N RB resources are wasted. If the RBG is scheduled, a network device needs to configure all resources of the RBG to the terminal device by using the DCI, and indicate the resources of the N RBs that cannot be used to transmit the PDSCH. In this case, the terminal device may learn, based on indication information, the resources of the N RBs that cannot be used to transmit the PDSCH. However, the protocol specifies that the terminal device is not expected to handle the case that the DMRS of the PDSCH overlaps the resources that cannot be used to transmit the PDSCH, therefore, the terminal device still considers that the DMRS exists at a position at which the DMRS is transmitted. This obviously affects channel estimation and noise estimation, and affects reception performance of the PDSCH. WO 2017/057989 A discloses a method for transmitting DCI by a base station in a wireless communication system comprises the steps of: allocating a resource for data transmission; and transmitting, in a first DCI format, DCI including scheduling information associated with the allocated resource. US2019/082403 A1 discloses that a user equipment may receive a communication that includes system information, wherein the system information includes information associated with identifying a set of resources that carry synchronization communications, wherein the set of resources is included in a set of potential resources on which synchronization communications can be carried. Nokia ET AL: "Resource sharing between PDCCH and PDSCH in NR", 3GPP DRAFT, R1-1710983, vol. RAN WG1, no. Qingdao, China; 20170627 - 20170630, 2017-06-26, XP051300183, discloses that when the UE detects that the DCI associated with the PDSCH overlaps with the resource allocated to PDSCH, PDSCH is always rate matched around the detected DCIs. WO 2018/012550 A1 discloses that if the frequency resources for the first signal are allocated using a second allocation unit configured to include multiple first allocation units, which are smallest allocation units, and if the second signal is allocated to a portion of said frequency resources, then said first signal is rate matched and/or punctured in a subcarrier that at least partially overlaps with the second signal or in a first allocation unit that at least partially overlaps with the second signal. US 2017/317808 A1 discloses that a method may comprise the steps of: determining a frequency resource area for transmitting an uplink channel so as to have a size equal to or smaller than the size of a physical resource block (PRB) including 12 subcarriers; generating a DMRS sequence for some sub-carriers among the 12 subcarriers when the frequency resource area for transmitting the uplink channel is determined to have a size smaller than the size of the PRB including the 12 subcarriers. US2018/227922 A1 discloses methods and apparatuses configured to reuse, reallocate, reserve, or reassign available control resources in a control region for carrying downlink (DL) payload or user data. SAMSUNG: "Remaining Issues on the NR Mobility", 3GPP DRAFT, R1-1715915, vol. RAN WG1, no. Nagoya, Japan, 20170918-20170921, 2017-09-17, XP051339374 discloses that during the measurement gap, UE does not expect to receive PDCCH/PDSCH in the serving cell. KR 2019 0027705 A disclo