TECHNICAL FIELD

The present disclosure relates to an electronic device, a communication method and a storage medium in wireless communication system, and in particular, to an electronic device, a communication method and a storage medium for channel state feedback/reporting in wireless communication system.

BACKGROUND ART

With further development of wireless communication technologies, techniques for reporting channel state information (CSI) is playing an increasingly important role. The channel state information reflects properties of a wireless channel and describes fading factors of a signal on a transmission path, such as signal scattering, environmental fading, range fading and the like. The conventional channel state feedback is typically based on PMI codebook, and can provide information such as Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Rank Indicator (RI), Channel State Information Reference Signal Resource Indicator (CSI-RS Resource Indicator, CRI) or the like. Based on the acquired channel state information, it is possible to adapt the communication system to the current channel state, thereby guaranteeing high-reliability and high-rate communications, especially for multi-antenna communication system.

In addition, an enhanced channel state feedback is now being discussed at present. As compared with the convention channel state feedback, the enhanced channel state feedback is able to provide channel state information with a higher spatial resolution (with a smaller granularity) and/or with a higher richness, and thus, it is possible to obtain accurate channel information even in case of acute channel scattering or angle scattering. However, the enhanced channel state feedback requires more overhead on processing and transmission.

The inventors of the present disclosure have noticed there may be a requirement to choose an apprariate channel state feedback as needed.

For example, Multiple Input Multiple Output (MIMO) is a critical technique for the physical layer in the 4G communication or even in the 5G communication, and the industry has come up with various techniques for enhancing MIMO, in which multi-user MIMO (MU-MIMO) is a hot issue in theoretical research and standardization, and is lively discussed in the standardization of the next generation NR MIMO. Among others, the accuracy of the channel state information is most important to MU MIMO, especially in case of a large number of transmitting antennas. However, in a MU MIMO scenario such as downlink multi-user spatial multiplexing, communication resources used by the users are required to have sufficiently good spatial orthogonality therebetween.

As shown inFIG. 1, two users UE1and UE2, which are close geographically, perform data transmission with the base station through the MU MIMO. When the orthogonality between each of the users and the base station is bad, the inter-channel interference is increased, and it is possible to cause a reduction of the accuracy of the channel state information reported by the users and thus a reduction of performance of the MU MIMO. In this case, there is a need to use a more accurate channel state feedback.

In addition to the scenario as described above, there may be other cases where the communication system is required to use another channel state feedback different from the current one.

SUMMARY OF THE INVENTION

An object of the present application is to propose a technology for changing the type of the channel state feedback so as to meet the need as described above.

A brief overview regarding the present disclosure is given hereinafter, for purpose of a basic understanding of some aspects of the present disclosure. However, it will be appreciated that the overview is not an exhaustive description of the present disclosure. It is not intended to specify key portions or important portions of the present disclosure, nor to limit the scope of the present disclosure. It aims at describing some concepts about the present disclosure in a simplified form and serves as a preorder of a more detailed description given later.

Accoridng to an aspect of the present disclosure, there provides an electronic device on a side of user, comprising a processing circuitry configured to report to a network control device a first type of channel state information by using a resource for the first type of channel state feedback allocated by the network control device, make a determination that a second type of channel state feedback is required, and notify the network control device of the determination.

Accoridng to an aspect of the present disclosure, there provides an electronic device on a side of network control, comprising a processing circuitry configured to allocate a resource for a first type of channel state feedback to a user device, receive from the user device an notification regarding a determination that a second type of channel state feedback is required, allocate a resource for the second type of channel state feedback to the user device; and receive the second type of channel state information.

Accoridng to an aspect of the present disclosure, there provides an electronic device on the side of network control, comprising a processing circuitry configured to allocate a resource for a first type of channel state feedback to a user device, make a determination that a second type of channel state feedback is required, and notify the user device of the determination.

Accoridng to an aspect of the present disclosure, there provides an electronic device on the side of user, comprising a processing circuitry configured to report to a network control device a first type of channel state information by using a resource for the first type of channel state feedback allocated by the network control device, receive from the network control device an notification regarding a determination that a second type of channel state feedback is required, and report to the network control device the second type of channel state information by using a resource for the second type of channel state feedback allocated by the network control device.

Accoridng to an aspect of the present disclosure, there provides a communication method on the side of user, comprising reporting to a network control device a first type of channel state information by using a resource for the first type of channel state feedback allocated by the network control device, making a determination that a second type of channel state feedback is required, and notifying the network control device of the determination.

Accoridng to an aspect of the present disclosure, there provides a communication method on the side of network control, comprising allocating a resource for a first type of channel state feedback to a user device, making a determination that a second type of channel state feedback is required, and notifying the user device of the determination.

Accoridng to an aspect of the present disclosure, there provides a communication method on the side of network control, comprising allocating a resource for a first type of channel state feedback to a user device, receiving from the user device an notification regarding a determination that a second type of channel state feedback is required, allocating a resource for the second type of channel state feedback to the user device; and receiving the second type of channel state information.

Accoridng to an aspect of the present disclosure, there provides a communication method on the side of user, comprising reporting to a network control device a first type of channel state information by using a resource for the first type of channel state feedback allocated by the network control device, receiving from the network control device an notification regarding a determination that a second type of channel state feedback is required, and reporting to the network control device the second type of channel state information by using a resource for the second type of channel state feedback allocated by the network control device.

Accoridng to an aspect of the present disclosure, there provides A non-transitory computer readable storage medium storing executable instructions which, when executed, implements any of the communication methods as described above.

Accoridng to each of the aspects of the present disclosure, the wireless communication system is able to employ appropriate channel state feedback as needed, and thus can make an optimum compromise between the accuracy of the channel state information and the overhead.

