Wireless communication method and user equipment
By having the user equipment indicate to the base station that it supports MU-MIMO R-ML receivers and request necessary parameters, the problem of resource waste caused by the base station's inability to determine its capabilities is solved, thus improving communication efficiency.
Patent Information
- Application Number
- CN202480012938.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-02-16
- Filing Date
- 2024-02-05
- Publication Date
- 2025-10-28
AI Technical Summary
In existing wireless communication schemes, base stations cannot determine the multi-user multiple-input multiple-output simplified maximum likelihood receiver capability of user equipment, resulting in wasted resources.
User equipment (UE) sends messages to the base station to indicate that it supports MU-MIMO R-ML receivers and requests parameters for coordinated scheduling of users as needed. The base station then provides the corresponding information based on its capabilities.
This reduces the waste of downlink resources and improves communication efficiency.
Smart Images
Figure CN120858531A_ABST
Abstract
Description
[0001] Cross-references to related applications
[0002] This application claims priority to U.S. Provisional Application Serial No. 63 / 485,272, filed February 16, 2023, the entire contents of which are incorporated herein by reference. Technical Field
[0003] This invention relates to wireless communication, and in particular to wireless communication using a simplified maximum likelihood receiver with multiple user multiple input multiple output. Background Technology
[0004] Multiple-input multiple-output (MIMO) systems employ a communication method requiring multiple antennas. By using multiple antennas, MIMO enables spatial multiplexing and / or beamforming, thereby increasing the overall system throughput. On the other hand, multi-user MIMO (MU-MIMO) refers to performing MIMO simultaneously for two or more user equipments (UEs). Generally, in MU-MIMO schemes, the transmitter sends signals to multiple users simultaneously at the same time and frequency in a MIMO manner. UEs equipped with MU-MIMO simplified maximum likelihood (R-ML) receivers require information about co-scheduled UEs to demodulate signals transmitted from the base station in MU-MIMO mode.
[0005] Some UEs can detect information about co-scheduled UEs, but others may not. However, the base station cannot determine the capabilities of each UE. Therefore, the base station cannot determine whether it is necessary to provide specific UEs with information about co-scheduled UEs. Providing this information to every UE by default would waste downlink resources.
[0006] Therefore, the current communication scheme can still be improved. Summary of the Invention
[0007] One embodiment of the present invention provides a method for wireless communication. According to the method, a user equipment (UE) unit determines that the UE can support a multi-user multiple-input multiple-output (MU-MIMO) simplified maximum likelihood (R-ML) receiver. The method further includes sending a message to a base station. The message indicates that the UE supports an MU-MIMO R-ML receiver.
[0008] One embodiment of the present invention provides a UE. The UE includes a processor and a transceiver. The processor is configured to determine that the UE supports an MU-MIMO R-ML receiver. The processor is also configured to send a message to a base station via the transceiver. The message indicates that the UE supports an MU-MIMO R-ML receiver. Attached Figure Description
[0009] The invention can be more fully understood by reading the following detailed description and referring to the accompanying drawings, wherein:
[0010] Figure 1 A schematic diagram of a communication system according to an embodiment of the present disclosure is shown;
[0011] Figure 2 A block diagram of a base station and a user equipment (UE) according to embodiments of the present disclosure is shown;
[0012] Figure 3 A flowchart of a wireless communication method according to an embodiment of the present disclosure is shown; and
[0013] Figure 4 A flowchart of a wireless communication method according to an embodiment of the present disclosure is shown. Detailed Implementation
[0014] The following description is intended to illustrate the general principles of the invention and should not be considered as a limiting description. The scope of the invention is best determined by referring to the appended claims.
[0015] Figure 1 A schematic diagram of a communication system 100 according to an embodiment of the present disclosure is shown. The communication system 100 includes a base station 110, user equipment (UE) 120, and UE 130. UE 120 and UE 130 communicate with the base station 110 in a multi-user multiple-input multiple-output (MU-MIMO) manner. UE 120 and UE 130 can connect to a network (e.g., the Internet) through the base station 110. UE 120 and UE 130 support simplified maximum likelihood (R-ML) receivers. The base station 110 simultaneously schedules data for UE 120 and UE 130. The base station 110 simultaneously transmits signals to UE 120 and UE 130. In other words, the signals of UE 120 and UE 130 overlap, and UE 120 receives the overlapping signals. Therefore, UE 120 and UE 130 are co-scheduled UEs. For UE 120, firstly, UE 120 must demodulate / decode the signals of UE 130 (i.e., the co-scheduled UE). Then, UE 120 subtracts the signal of UE 130 from the received overlapping signal to obtain the signal of UE 120.
[0016] To demodulate the signals of the co-scheduled UE, UE 120 requires the following information or parameters: the scrambling code identifier of the co-scheduled UE, the time and frequency resources occupied by the co-scheduled UE, the modulation order used by the co-scheduled UE, and the MIMO layer used by the co-scheduled UE. The scrambling code identifier indicates the scrambling code used in the signal. The modulation order indicates the modulation type used in the signal, such as, but not limited to, 8-phase shift keying (PSK), 16PSK, 32PSK, 32 quadrature amplitude modulation (QAM), 64QAM, and 128QAM. The MIMO layer indicates the number of independent data streams simultaneously received by the UE. In some embodiments, UE 120 can detect these parameters itself, for example, by performing blind detection. In other embodiments, UE 120 cannot detect these parameters and requires base station 110 to provide them. In some embodiments, base station 110 uses downlink control information (DCI), media access control (MAC) control element (CE), radio resource configuration (RRC) signaling, or a combination thereof, to notify UE 120 of these parameters. Therefore, in some embodiments, UE 120 can notify base station 110 whether UE 120 needs the base station to provide parameters for co-scheduling UEs. By doing so, base station 110 can determine whether to transmit co-scheduling parameters to UE 110, thereby reducing the waste of downlink transmission resources.
[0017] It should be noted that, although Figure 1 Only two UEs are shown, but there may be more than two UEs in the communication system 100 (i.e., there may be multiple coordinated scheduling UEs).
[0018] Figure 2 A block diagram of a base station 110 and a UE 120 according to an embodiment of the present disclosure is shown. UE 130 may be similar to UE 120 and will not be described in detail below. Base station 110, UE 120, and UE 130 can perform various functions to implement the processes and methods described herein. For example, base station 110 may be an access point, access terminal, evolved Node B (eNB), or gNodeB (gNB). UE 120 may be a mobile device, wearable device, wireless communication device, or computing device. In some embodiments, UE 120 is implemented in a smartphone, smartwatch, tablet, or laptop. Both base station 110 and UE 120 can be implemented as one or more integrated circuit (IC) chips, such as one or more processors. Base station 110 includes a processor 111, memory 112, transceiver 113, and antennas 114a-114d. UE 120 includes a processor 121, memory 122, transceiver 123, and antennas 124a and 124b.
[0019] Processors 111 and 121 control the operation of base station 110 and UE 120, respectively. Processors 111 and 121 provide the necessary processing power to execute the operating systems, programs, software, modules, applications, and functions of base station 110 and UE 120. In some embodiments, processors 111 and 121 may be implemented in hardware form comprising electronic components including transistors, diodes, capacitors, resistors, or inductors. These components are configured to perform a specific purpose according to this disclosure. Therefore, processors 111 and 121 are dedicated machines specifically configured to perform specific tasks incorporating the methods of this disclosure. For example, processors 111 and 121 may be a combination and / or associated chipset of a general-purpose microprocessor, a central processing unit, a general-purpose processor, and a dedicated processor.
[0020] Memory 112 and 122 store data required by processor 111 and 121, respectively. Memory 112 and 122 may include non-volatile memory, such as read-only memory (ROM) and flash memory. Memory 112 and 122 may also include volatile memory, such as dynamic random access memory (DRAM) and static random access memory (SRAM). In some embodiments, memory 112 and 122 store programs, such as computer-readable instructions. The programs can be operated by processor 111 and 121. When the programs are operated by processor 111 and 121, the programs cause processor 111 and 121 to implement the methods of embodiments of this disclosure.
[0021] Transceivers 113 and 123 are capable of wirelessly transmitting and receiving data. Transceiver 113 is coupled to antennas 114a-114d, and transceiver 123 is coupled to antennas 124a and 124b. Transceivers 113 and 123 receive radio frequency (RF) signals from the antennas and convert the RF signals into baseband signals. Transceiver 123 also converts the baseband signals into RF signals and transmits the RF signals through the antennas. Transceiver 123 includes an R-ML receiver.
[0022] It should be noted that base station 110 and UE 120 can have any number of antennas. Furthermore, base station 110 can use any possible MIMO configuration to communicate with UEs 120 and 130. For example, the connection between base station 110 and UE 120 can use a 2x2 MIMO scheme, and the connection between base station 110 and UE 130 can also use a 4x2 MIMO scheme. Alternatively, the connection between base station 110 and UE 120 can use a 4x2 MIMO scheme, and the connection between base station 110 and UE 130 can also use a 4x2 MIMO scheme.
[0023] In addition, base station 110 and UE 120 may also include Figure 2Other components not shown. For example, base station 110 and UE120 may also include, via wired / wireless connection, at least one power supply, display, touchscreen, keyboard, mouse, microphone and / or speaker, etc.
[0024] Figure 3 A flowchart of a wireless communication method 300 according to an embodiment of the present disclosure is shown. Method 300 can be... Figure 1 The method 300 is executed by UE 120 (or UE 130) in the communication system 100. The method 300 is described below in conjunction with... Figure 1 and Figure 2 The following description is provided. Method 300 may begin with operation 310. In operation 310, UE 120 sends a message to base station 110 via transceiver 123. In some embodiments, UE 120 uses the message to indicate its capabilities in the MU-MIMO communication system. In some embodiments, the message indicates that UE 120 supports an MU-MIMO R-ML receiver. In some embodiments, processor 121 is configured to determine whether UE 120 supports (e.g., is equipped with) an MU-MIMO R-ML receiver. In some embodiments, the message further indicates whether UE 120 requires base station 110 to provide parameters for UE 130 (i.e., the co-scheduled UE). The parameters for UE 130 are the scrambling identifier of UE 130, the time and frequency resources of UE 130, the modulation order of UE 130, and the MIMO layer of UE 130.
[0025] In some embodiments, when UE 120 is capable of detecting the parameters of UE 130 on its own, the message indicates that UE 120 does not require base station 110 to provide the parameters of UE 130. UE 120 then detects the parameters of UE 130 to demodulate the signal of UE 130 and its own signal. In some embodiments, UE 120 uses energy detection and / or other algorithms to detect the parameters of UE 130. In some embodiments, processor 121 is configured to determine whether UE 120 is capable of detecting the parameters of the co-scheduled UE (e.g., based on the hardware configuration and / or processing power of UE 120). In some embodiments, UE 120 may determine that at least one parameter is the same between UE 120 and UE 130.
[0026] In some embodiments, UE 120 obtains a predefined configuration from base station 110, which indicates that at least one parameter is the same between UE 120 and UE 130. In these embodiments, UE 120 only needs to detect other parameters that are different from the same parameter (i.e., parameters that are different between UE 120 and 130). For example, the predefined configuration may indicate that UE 120 and UE 130 are configured with the same scrambling code ID. Therefore, UE 120 does not detect the scrambling code ID of UE 130, but instead detects other parameters of UE 130 (i.e., the time and frequency resources of UE 130, the modulation order of UE 130, and the MIMO layer of UE 130).
[0027] In some embodiments, when User Equipment 120 cannot detect the parameters of User Equipment 130 on its own, a message instructs UE 120 to request Base Station 110 to provide the parameters of UE 130. In some embodiments, UE 120 may determine that at least one parameter is the same between UE 120 and UE 130. In some embodiments, UE 120 obtains a predefined configuration from Base Station 110 that indicates at least one parameter is the same between UE 120 and UE 130. In these embodiments, UE 120 informs Base Station 110 in a message that the UE needs Base Station 110 to provide other parameters different from the same parameter (i.e., parameters that are different between UE 120 and 130). In other words, the message may further instruct UE 120 which parameter it needs Base Station 110 to provide. For example, the predefined configuration may indicate that UE 120 and UE 130 are configured to have the same scrambling identifier. Therefore, UE 120 notifies base station 110 to provide parameters other than the scrambling identifier (i.e., the time and frequency resources of UE 130, the modulation order of UE 130, and the MIMO layer of UE 130).
[0028] In operation 320, UE 120 receives signals from base station 110. As described above, base station 110 schedules data from UE 120 together with data from UE 130, and the signals of UE 120 and UE 130 overlap. In some embodiments, when a message indicates that UE 120 needs base station 110 to provide parameters of UE 130, UE 120 also receives parameters of UE 130 from base station 110. In some embodiments, the signals received from base station 110 may contain auxiliary information indicating parameters of UE 130. In some embodiments, base station 110 uses DCI, MAC CE, RRC signaling, or a combination thereof to transmit auxiliary information to UE 120. In some embodiments, when a message indicates that UE 120 does not need base station 110 to provide parameters of UE 130, the signals received from base station 110 may not contain parameters of UE 130.
[0029] In some embodiments, UE 120 sends a message to base station 110 before communicating with base station 110 in MU-MIMO mode (operation 310). After receiving the message from UE 120, base station 110 decides to transmit signals to UE 120 and 130 in MU-MIMO mode (operation 320).
[0030] Figure 4 A flowchart of a wireless communication method 400 according to an embodiment of the present disclosure is shown. Method 400 can be... Figure 1 The method 400 is executed by UE 120 (or UE 130) in the communication system 100. The method 400 is described below in conjunction with... Figure 1 and Figure 2 The following description is provided. Method 400 can begin with operation 410. In operation 410, the processor 121 of UE 120 determines that UE 120 supports a MU-MIMO R-ML receiver. In operation 420, UE 120 sends a message to base station 110 via transceiver 123. This message indicates that UE 120 supports a MU-MIMO R-ML receiver.
[0031] In embodiments of this disclosure, the UE can notify the base station of its capabilities. The base station can then decide whether to provide the UE with additional information (e.g., auxiliary information) based on the UE's capabilities. Therefore, embodiments of this disclosure can avoid transmitting unnecessary information, thereby saving resources.
[0032] While the invention has been described by way of examples and preferred embodiments, it should be understood that the invention is not limited to the disclosed embodiments. Rather, it is intended to cover various modifications and similar arrangements (as would be understood by those skilled in the art). Therefore, the scope of the appended claims should be given the broadest interpretation to cover all such modifications and similar arrangements.
Claims
1. A method for wireless communication, comprising: It is determined by a user equipment (UE) that the UE supports a multi-user multiple-input multiple-output (MU-MIMO) simplified maximum likelihood (R-ML) receiver; as well as The UE sends a message to a base station. The message indicates that the UE supports the MU-MIMO R-ML receiver.
2. The method as described in claim 1, wherein, The message further indicates whether the UE needs the base station to provide parameters for coordinating the scheduling of the UE; The UE and the coordinated scheduling UE communicate with the base station in MU-MIMO mode.
3. The method of claim 2, further comprising: When the UE is able to detect the parameters of the co-scheduling UE, it uses this message to notify the base station that the UE does not need the base station to provide the parameters of the co-scheduling UE.
4. The method of claim 2, further comprising: When the UE cannot detect the parameters of the co-scheduled UE, this message is used to notify the base station that the UE needs the base station to provide the parameters of the co-scheduled UE.
5. The method of claim 4, further comprising: The UE receives auxiliary information from the base station that indicates the parameters of the coordinated scheduling UE.
6. The method of claim 2, further comprising: This UE determines that at least one parameter is the same between the UE and the coordinated UE; as well as The UE notifies the base station that it requires the base station to provide parameters different from the same parameter; or The UE detects other parameters that are different from the same parameter.
7. The method of claim 2, wherein, This parameter includes the scrambling identifier of the coordinated UE, the time and frequency resources of the coordinated UE, the modulation order of the coordinated UE, and the MIMO layer of the coordinated UE.
8. The method of claim 2, wherein, The UE sends this message to the base station before communicating with it in MU-MIMO mode.
9. A user equipment (UE), comprising: One processor; as well as One transceiver, The processor is configured as follows: The UE was determined to support a multi-user multiple-input multiple-output (MU-MIMO) simplified maximum likelihood R-ML receiver; and Send a message to a base station using this transceiver; The message indicates that the UE supports the MU-MIMO R-ML receiver.
10. The UE as claimed in claim 9, wherein, The message further indicates whether the UE needs the base station to provide parameters for coordinating UE scheduling; The UE and the coordinated scheduling UE communicate with the base station in MU-MIMO mode.
11. The UE as claimed in claim 10, wherein, The processor is further configured as follows: When the UE is able to detect the parameters of the co-scheduling UE, it uses this message to notify the base station that the UE does not need the base station to provide the parameters of the co-scheduling UE.
12. The UE as claimed in claim 10, wherein, The processor is further configured as follows: When the UE cannot detect the parameters of the co-scheduled UE, this message is used to notify the base station that the UE needs the base station to provide the parameters of the co-scheduled UE.
13. The UE as claimed in claim 12, wherein, The processor is further configured as follows: The transceiver receives auxiliary information from the base station that indicates the parameters of the coordinated UE.
14. The UE as claimed in claim 10, wherein, The processor is further configured as follows: Determine that at least one parameter is the same between the UE and the coordinated UE; and The UE is notified to the base station that it requires the base station to provide parameters different from the same parameter; or Detect other parameters that are different from the same parameter.
15. The UE as claimed in claim 10, wherein, This parameter includes the scrambling identifier of the coordinated UE, the time and frequency resources of the coordinated UE, the modulation order of the coordinated UE, and the MIMO layer of the coordinated UE.