CN-114514785-B - Side link communication

CN114514785BCN 114514785 BCN114514785 BCN 114514785BCN-114514785-B

Abstract

A method for transmitting channel state information and/or location information between nodes in a network. And in particular to a process and system for side link multicast transmission in a cellular network.

Inventors

Virgil Garcia
OMAR SALIM

Assignees

捷开通讯(深圳)有限公司

Dates

Publication Date: 20260512
Application Date: 20200924
Priority Date: 20191009

Claims (15)

1. A method for determining channel state information in a multicast system, characterized in that the method comprises the steps of transmitting channel state information reference signals from a first user equipment of a group of user equipments as multicast messages to all other user equipments of the group, and transmitting signals comprising channel state information from each user equipment of the group receiving the channel state information reference signals to the first user equipment, wherein the channel state information reference signals and/or the transmission resources of the channel state information are allocated by a base station or the first user equipment, and in case of transmitting channel state information reports by unicast transmission, the channel state information comprises information related to the position, direction and/or distance of the user equipment, wherein the position of the user equipment is reported as a payload in the channel state information report, and in case of transmitting channel state information reports by multicast transmission, the multicast system supports each user equipment to alternately transmit the channel state information reference signals and channel state information reports by a side link control information, wherein each user equipment acquires all the channel state information reports from each user equipment in the side link in turn, wherein all the user equipment can acquire all channel state information from each user equipment in the channel state report by each user equipment in a predetermined sequence, the PSS channel state transmission link is performed by each user equipment in the group, each user equipment transmits channel state information reference signals in a multicast transmission in sequence, and then all user equipment transmits corresponding channel state information reports in a multicast format, wherein each transmission comprises the channel state information reference signals and the channel state information reports received before as data, measurement and sharing of the channel state information can be realized by receiving one multicast physical side link shared channel transmission, and the transmission sequence is determined through pre-configuration or resource monitoring, and each channel state information report comprises new or updated channel state information data or differential data relative to the previous channel state information report.
2. The method of claim 1, wherein one indication of allocation of resources is sent from the base station to the first user device, and a channel state information reference signal sent by the first user device comprises information indicating the allocation of resources.
3. The method of claim 1, wherein one indication of allocation of resources is sent from the base station to each user device of the group.
4. The method of claim 1, further comprising the step of transmitting the channel state information from the first user device to the base station.
5. The method of claim 1, wherein the method is initiated by a request from the first user device to the base station.
6. The method of claim 1, wherein the method is initiated by the base station.
7. The method of claim 1, wherein transmission resources for the channel state information reference signal and/or the channel state information are selected by the first user equipment.
8. The method of claim 1, wherein the channel state information is sent by each user device to the first user device as a unicast message.
9. The method of claim 1, wherein in the case of sending a channel state information report by multicast transmission, the channel state information is sent by each user device as a multicast message to all other user devices in a group including the first user device.
10. The method of claim 9, further comprising the second user device of the group transmitting a signal including the channel state information reference signal to all other user devices of the group, and wherein all user devices in the group except the second user device transmit channel state information to all other user devices in the group in a multicast message.
11. The method of claim 1, wherein the signal comprising channel state information further comprises an indication of a location of a user device transmitting the channel state information.
12. The method of claim 11, wherein the user device receiving the location information uses a location of the user device transmitting the channel state information for directional transmission for the user device transmitting the channel state information.
13. The method of claim 12, wherein the first user device sends the location information to the base station.
14. A method for determining channel state information in a multicast system is characterized in that the method comprises the steps of transmitting a message to each user equipment in a group by a base station in response to a channel state information reference signal received from a first user equipment in the group, instructing each user equipment to report channel state information to the base station, in response to the message, transmitting channel state information reference signals to other user equipment in the group by the first user equipment, transmitting channel state information to the base station by each user equipment receiving the channel state information reference signal, wherein transmission resources of the channel state information reference signal and/or the channel state information are allocated by the base station or the first user equipment, and in case of transmitting channel state information reports by unicast transmission, the channel state information comprises information related to the position, direction and/or distance of the user equipment, wherein the position of the user equipment is reported as a payload in the channel state information report, in case of transmitting channel state information reports by multicast, transmitting channel state information by the first user equipment transmits channel state information reference signals by a side link control information in turn, transmitting channel state information by the side link control information by the user equipment, transmitting channel state information by the PSS-sub-channel state information from each user equipment to each user equipment in the group, wherein all user equipment can acquire all channel state information of the PSS-channel state information can be reported by each user equipment in the PSS (UE) and each user equipment in the PSS link, and all user equipment can acquire the channel state information by each user equipment in the channel state report, the multicast channel state information reporting process is sequentially performed by each user equipment in the group in a predetermined order, each user equipment sequentially transmits channel state information reference signals in a multicast transmission, and then all user equipment transmits corresponding channel state information reports in a multicast format, wherein each transmission comprises the channel state information reference signals and the channel state information reports received before as data, measurement and sharing of the channel state information can be realized by receiving one multicast physical side link shared channel transmission, and the transmission order is determined through pre-configuration or resource monitoring, and each channel state information report comprises new or updated channel state information data or differential data relative to the previous channel state information report.
15. A method for sharing location information between user equipments, said method comprising a first user equipment of a group of user equipments transmitting side link control information messages and channel state information reference signals to at least one other user equipment of said group, each user equipment of said group receiving said channel state information reference signals transmitting signals comprising channel state information to said first user equipment, characterized in that in case of transmitting channel state information reports by multicast transmission location information is transmitted in said side link control information and used for user grouping, relay/co-operation management, group length selection and/or power control, wherein said channel state information reference signals and/or transmission resources of said channel state information are allocated by a base station or said first user equipment, and in case of transmitting said channel state information reports by unicast transmission said channel state information comprises information related to user equipment location, direction and/or distance, wherein the location of said user equipment is reported as a payload in a channel state information report, and in turn the transmission of said multicast transmission channel state information is reported by said group on each other user equipment, wherein in case of transmitting side channel state information is reported by said group about each of said user equipment by said PSS-channel state information transmission system, said physical state information is shared by said user equipment, each multicast transmission enabling all user equipments to obtain channel state information of all links from each transmitting user equipment to all receiving user equipments, wherein a multicast channel state information reporting procedure is performed by each user equipment within the group in a predetermined order, each user equipment sequentially transmitting channel state information reference signals in the multicast transmission, and subsequently all user equipments transmitting corresponding channel state information reports in a multicast format, wherein each transmission comprises the channel state information reference signals and the previously received channel state information reports as data, measurement and sharing of the channel state information can be achieved by receiving one multicast physical side link shared channel transmission, and wherein the transmission order is determined by pre-configuration or resource monitoring, each channel state information report comprises new or updated channel state information data, or differential data with respect to the previous channel state information report.

Description

Side link communication Technical Field The following disclosure relates to side-link communications, and more particularly to reporting channel quality or location of such communications. Background Wireless communication systems, such as third generation (3G) mobile phone standards and technologies, are well known. Such 3G standards and technologies have been developed by the third generation partnership project (3 GPP). Third generation wireless communications have generally been developed to support macrocell mobile telephone communications. Communication systems and networks have evolved to broadband and mobile systems. In a cellular wireless communication system, user Equipment (UE) is connected to a Radio Access Network (RAN) through a wireless link. The radio access network comprises a set of base stations providing radio links for user equipment located in a cell covered by the base stations, and an interface to a Core Network (CN) providing overall network control. As will be appreciated, the radio access network and the core network each perform a respective function related to the overall network. For convenience, the term cellular network will be used to refer to the combined radio access network and core network, and it will be understood that the term is used to refer to the corresponding system for performing the disclosed functions. The third generation partnership project has developed a so-called Long Term Evolution (LTE) system, an evolved universal mobile telecommunications system terrestrially incorporated radio access network (E-UTRAN) for mobile access networks in which one or more macro cells are supported by base stations called enodebs or enbs (evolved nodebs). Recently, long term evolution systems have evolved further towards so-called 5G or NR (new radio) systems, in which one or more cells are supported by a base station called a gNB. NR is proposed to use an Orthogonal Frequency Division Multiplexing (OFDM) physical transmission format. In a conventional cellular communication network, all signaling is between each mobile device and the base station, rather than directly between the mobile devices, even though the mobile devices are within wireless communication range of each other. This may result in inefficient use of radio transmission resources and may increase the use of base station resources. Side link communications allow mobile devices to communicate directly, rather than through a base station, potentially increasing the utilization of wireless and base station resources. Side link communications are considered particularly interesting for machine-to-machine communications, especially vehicle-to-vehicle (V2V) and vehicle-to-everything (V2X) communications. There are three main categories of side-chain communication-unicast, multicast and broadcast. Unicast transmission refers to one-to-one transmission between user devices. Multicast transmissions are one-to-many transmissions, but only user devices in a group may receive the transmissions. Broadcast transmissions are one-to-many transmissions that cannot control the recipient. The transmitter may utilize channel state Information (CSI: CHANNEL STATE Information) for link adaptation so that the appropriate modulation and coding scheme (MCS: modulation and coding scheme) may be selected and other parameters used, such as transmit power. The channel state information may also be used to aid in proper beamforming when multiple antennas or spatial multiplexing is used. In a frequency division duplex (FDD: frequency Division Duplex) system, channel state information is typically estimated at the receiver using reference symbols transmitted by the transmitter. The channel state information is then transmitted to the transmitter for use. The same procedure may be used in a time division duplex (TDD: time division Duplex) system or the user equipment may use the return transmission from the receiver user equipment to estimate the channel state information. However, this approach assumes channel reciprocity, but this may not be the case due to hardware variations in the user equipment. Therefore, it is more common to employ a method of estimating channel state information at a receiver and transmitting it to a transmitter. Multicast communication presents particular difficulties for channel state information estimation because the number of links increases geometrically with the number of user equipments in the group. To date, no effort has been made to address this problem of providing channel state information estimation in a multicast scenario. It may also be beneficial to share location information between user devices. For example, the location information may be used for user grouping, relay/collaboration management, group leader selection, and/or power control. In general, the term location refers to an absolute position of a user equipment that other user equipment (or base station or other node) may use to calculate