# US 11,641,260 B2 · Switching method, base station and terminal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,641,260 B2 - Document ID: US11641260B2 - Status: Granted - Kind: B2 - Application number: 17/320,100 - Filed: 2021-05-13 - Published: 2021-08-26 - Granted: 2023-05-02 - Earliest claimed: 2017-01-06 - Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Inventors: Zhi Zhang; Wenhong Chen; Ning Yang - Web page: https://patentgrep.com/patent/US11641260B2 ## CPC - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 5/0096: {Indication of changes in allocation} - H04L 41/0813: characterised by the conditions triggering a change of settings - H04L 49/25: Routing or path finding in a switch fabric - H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04L 5/0082: {at predetermined intervals} - H04L 27/2601: {Multicarrier modulation systems} - H04L 27/2602: {Signal structure} - Y02D 30/70: in wireless communication networks - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract Provided are a switching method, a base station and a terminal. The method includes that: a base station configures a switching message for a narrow-bandwidth receiving mode, the switching message including time when a terminal is indicated to enter the narrow-bandwidth receiving mode and a position of a narrow bandwidth on a frequency band when the narrow-bandwidth receiving mode is entered; and the switching message is sent to the terminal to indicate the terminal to switch to the narrow bandwidth specified in the switching message for information reception, the narrow bandwidth being smaller than a system bandwidth. With adoption of the embodiments, the terminal may receive a signal on the narrow bandwidth, and reduction in power consumption of the terminal is facilitated. ## Claims ### Claim 1 A switching method, implemented by a base station, comprising: configuring a switching message for a narrow-bandwidth receiving mode, the switching message comprising time when a terminal is indicated to enter the narrow-bandwidth receiving mode and a position of a narrow bandwidth on a frequency band when the narrow-bandwidth receiving mode is entered; pre-configuring a duration of narrow-band signal detection of the terminal in the narrow-bandwidth receiving mode and an interval period of the narrow-band signal detection; sending the duration of the narrow-band signal detection and the interval period of the narrow-band signal detection to the terminal; sending the switching message to the terminal to indicate the terminal to switch to the narrow bandwidth specified in the switching message for information reception, the narrow bandwidth being smaller than a system bandwidth; and sending Downlink Control Information (DCI) for the terminal in a Physical Downlink Control Channel (PDCCH) on the narrow bandwidth, wherein the DCI is located in a User Equipment (UE)-specific search space corresponding to the terminal and is at a Control Channel Element (CCE) aggregation level corresponding to the terminal. ### Claim 2 (depends on 1) The switching method of claim 1, after the terminal is switched to the narrow bandwidth specified in the switching message for the information reception, the method further comprising: sending a frequency band index and a switching delay to the terminal to indicate the terminal to switch to another narrow bandwidth or another system bandwidth, wherein the frequency band index is used to indicate a bandwidth that the terminal is to be switched to at different frequency-domain positions, and the switching delay is used to indicate a time offset between a present moment and a moment when the terminal starts signal reception on the bandwidth indicated by the frequency band index. ### Claim 3 (depends on 1) The switching method of claim 1, when the terminal is in the narrow-bandwidth receiving mode, the method further comprising: in the PDCCH on the narrow bandwidth, scheduling for the terminal a Physical Downlink Shared Channel (PDSCH) comprising downlink data, the downlink data being less than a preset capacity. ### Claim 4 (depends on 3) The switching method of claim 3, wherein a frequency-domain resource of the PDSCH is located within the narrow bandwidth, and the DCI sent in the PDCCH on the narrow bandwidth comprises a resource index corresponding to the frequency-domain resource allocated for the PDSCH and comprises a Modulation and Coding Scheme (MCS) for the downlink data. ### Claim 5 (depends on 1) The switching method of claim 1, when the terminal is in the narrow-bandwidth receiving mode, the method further comprising: in the PDCCH on the narrow bandwidth, sending a feedback acknowledgement signal and a Hybrid Auto Repeat Request (HARQ) process identifier for uplink transmission to the terminal. ### Claim 6 A switching method, comprising: receiving, by a terminal, a switching message for a narrow-bandwidth receiving mode, the switching message configured by a base station and comprising time when the terminal is indicated to enter the narrow-bandwidth receiving mode and a position of a narrow bandwidth on a frequency band when the narrow-bandwidth receiving mode is entered; receiving a duration of narrow-band signal detection of the terminal in the narrow-bandwidth receiving mode and an interval period of the narrow-band signal detection, which are pre-configured by the base station, and turning off a receiver in the interval period; switching to the narrow bandwidth specified in the switching message for information reception, the narrow bandwidth being smaller than a system bandwidth; and receiving Downlink Control Information (DCI) for the terminal in a Physical Downlink Control Channel (PDCCH) on the narrow bandwidth, wherein the DCI is located in a User Equipment (UE)-specific search space corresponding to the terminal and is at a Control Channel Element (CCE) aggregation level corresponding to the terminal. ### Claim 7 (depends on 6) The switching method of claim 6, after the terminal is switched to the narrow bandwidth specified in the switching message for the information reception, the method further comprising: receiving a frequency band index and a switching delay from the base station, and switching to another narrow bandwidth or another system bandwidth according to the frequency band index and the switching delay, wherein the frequency band index is used to indicate a bandwidth that the terminal is to switch to at different frequency-domain positions, and the switching delay is used to indicate a time offset between a present moment and a moment when the terminal starts signal reception on the bandwidth indicated by the frequency band index. ### Claim 8 (depends on 6) The switching method of claim 6, when the terminal is in the narrow-bandwidth receiving mode, the method further comprising: in the PDCCH on the narrow bandwidth, receiving a Physical Downlink Shared Channel (PDSCH) scheduled for the terminal by the base station and comprising downlink data, the downlink data being less than a preset capacity. ### Claim 9 (depends on 6) The switching method of claim 6, when the terminal is in the narrow-bandwidth receiving mode, the method further comprising: in the PDCCH on the narrow bandwidth, receiving from the base station a feedback acknowledgement signal and a Hybrid Auto Repeat Request (HARQ) process identifier for uplink transmission. ### Claim 10 A base station, comprising: a processor, a memory, a transceiver and a bus, the processor, the memory and the transceiver being connectable through the bus, wherein the transceiver is configured to send and receive a signal and communicate with a terminal, the memory is configured to store a set of program codes, and the processor is configured to call the program codes stored in the memory to execute the following operations: configuring a switching message for a narrow-bandwidth receiving mode, the switching message comprising time when a terminal is indicated to enter a narrow-bandwidth receiving mode and a position of a narrow bandwidth on a frequency band when the narrow-bandwidth receiving mode is entered; pre-configuring a duration of narrow-band signal detection of the terminal in the narrow-bandwidth receiving mode and an interval period of the narrow-band signal detection; sending, through the transceiver, the duration of the narrow-band signal detection and the interval period of the narrow-band signal detection to the terminal; sending, through the transceiver, the switching message to the terminal to indicate the terminal to switch to the narrow bandwidth specified in the switching message for information reception, the narrow bandwidth being smaller than a system bandwidth; and sending, through the transceiver, Downlink Control Information (DCI) for the terminal in a Physical Downlink Control Channel (PDCCH) on the narrow bandwidth; wherein the DCI is located in a User Equipment (UE)-specific search space corresponding to the terminal and is at a Control Channel Element (CCE) aggregation level corresponding to the terminal. ### Claim 11 (depends on 10) The base station of claim 10, wherein the processor is further configured to, after the terminal is switched to the narrow bandwidth specified in the switching message for the information reception, send a frequency band index and a switching delay to the terminal to indicate the terminal to switch to another narrow bandwidth or another system bandwidth; and the frequency band index is used to indicate a bandwidth that the terminal is to be switched to at different frequency-domain positions, and the switching delay is used to indicate a time offset between a present moment and a moment when the terminal starts signal reception on the bandwidth indicated by the frequency band index. ### Claim 12 (depends on 10) The base station of claim 10, wherein the processor is further configured to, when the terminal is in the narrow-bandwidth receiving mode, in the PDCCH on the narrow bandwidth, schedule for the terminal a Physical Downlink Shared Channel (PDSCH) comprising downlink data, the downlink data being less than a preset capacity. ### Claim 13 (depends on 10) The base station of claim 10, wherein the processor is further configured to, when the terminal is in the narrow-bandwidth receiving mode, send in the PDCCH on the narrow bandwidth, through the transceiver, a feedback acknowledgement signal and a Hybrid Auto Repeat Request (HARQ) process identifier for uplink transmission to the terminal. ### Claim 14 A terminal, comprising: a processor, a memory, a transmitter, a receiver and a bus, the processor, the memory, the transmitter and the receiver being connected through the bus, wherein the transmitter is configured to transmit a signal, the receiver is configured to receive the signal, the transmitter and the receiver are independently arranged respectively or integrated, the memory is configured to store a set of program codes, and the processor is configured to call the program codes stored in the memory to execute the following operations: receiving, through the receiver, a switching message, configured by a base station, in a narrow-bandwidth receiving mode, the switching message comprising time when the terminal is indicated to enter the narrow-bandwidth receiving mode and a position of a narrow bandwidth on a frequency band when the narrow-bandwidth receiving mode is entered; receiving, through the receiver, a duration of narrow-band signal detection of the terminal in the narrow-bandwidth receiving mode and an interval period of the narrow-band signal detection, which are pre-configured by the base station, and turning off the receiver in the interval period; executing switching to the narrow bandwidth specified in the switching message for information reception, the narrow bandwidth being smaller than a system bandwidth; and receiving, through the receiver, Downlink Control Information (DCI) for the terminal in a Physical Downlink Control Channel (PDCCH) on the narrow bandwidth; wherein the DCI is located in a User Equipment (UE)-specific search space corresponding to the terminal and is at a Control Channel Clement (CCE) aggregation level corresponding to the terminal. ### Claim 15 (depends on 14) The terminal of claim 14, wherein the processor is further configured to, after the terminal is switched to the narrow bandwidth specified in the switching message for the information reception, receive, through the receiver, a frequency band index and a switching delay from the base station and execute switching to another narrow bandwidth or another system bandwidth according to the frequency band index and the switching delay; and the frequency band index is used to indicate a bandwidth that the terminal is to be switched to at different frequency-domain positions, and the switching delay is used to indicate a time offset between a present moment and a moment when the terminal starts signal reception on the bandwidth indicated by the frequency band index. ### Claim 16 (depends on 14) The terminal of claim 14, wherein the processor is further configured to, when the terminal is in the narrow-bandwidth receiving mode, receive, in the PDCCH on the narrow bandwidth and through the receiver, a Physical Downlink Shared Channel (PDSCH) scheduled for the terminal by the base station and comprising downlink data, the downlink data being less than a preset capacity; or the processor is further configured to, when the terminal is in the narrow-bandwidth receiving mode, receive, in the PDCCH on the narrow bandwidth and through the receiver, a feedback acknowledgement signal and Hybrid Auto Repeat Request (HARQ) process identifier for uplink transmission from the base station.