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EP-4327584-B1 - METHOD, DEVICE, AND SYSTEM FOR POWER SAVING IN WIRELESS NETWORKS

EP4327584B1EP 4327584 B1EP4327584 B1EP 4327584B1EP-4327584-B1

Inventors

  • MA, XIAOYING
  • XU, JUN
  • MA, Xuan
  • CHEN, Mengzhu
  • PENG, FOCAI

Dates

Publication Date
20260506
Application Date
20210929

Claims (11)

  1. A method performed by a User Equipment, UE, comprising: receiving, from a wireless communication node, a configuration message comprising configuration information; receiving, from the wireless communication node, a downlink control information, DCI, message comprising a DCI field, wherein a codepoint of the DCI field is mapped to a Physical Downlink Control Channel, PDCCH, monitoring behavior from a PDCCH monitoring behavior set comprising multiple PDCCH monitoring behaviors; determining the PDCCH monitoring behavior based on the DCI message; and applying the PDCCH monitoring behavior, wherein the PDCCH monitoring behavior set comprises: a first PDCCH monitoring behavior subset comprising at least one of following: deactivating PDCCH monitoring skipping; and a list of PDCCH monitoring skipping behaviors, each PDCCH monitoring skipping behaviors being associated with a skipping duration, and a second PDCCH monitoring behavior subset comprising a list of Search Space Set Group, SSSG, monitoring behaviors, wherein the configuration information comprises at least one of: a set of durations associated with the first PDCCH monitoring behavior subset; and a set of SSSGs associated with the second PDCCH monitoring behavior subset.
  2. The method of claim 1, wherein: the set of SSSGs comprises a first type SSSG; and the set of SSSGs does not co-exist in the PDCCH monitoring behavior set with the set of durations in the configuration information; and the first type SSSG comprises: an SSSG configured without a search space set; an SSSG associated with an index greater than or equal to 2 indicating there are more than 2 SSSGs in the set of SSSGs; a dormant SSSG; or an SSSG associated with which the UE can stop monitoring PDCCH for a duration.
  3. The method of claim 1, wherein the list of SSSG monitoring behaviors comprises at least one of: stopping monitoring a Search Space Set, SSS, associated with a first SSSG and a second SSSG, and monitoring an SSS associated with a third SSSG; stopping monitoring an SSS associated with the first SSSG and the third SSSG and monitoring an SSS associated with the second SSSG; or stopping monitoring an SSS associated with the second SSSG and the third SSSG and monitoring an SSS associated with the first SSSG.
  4. The method of claim 1, wherein: the PDCCH monitoring behavior set is determined by at least one of: a UE capability of the UE; a pre-determined value; or a bit-width of the DCI field; and the UE capability or a pre-determined value comprises at least one of: a maximum number of indication bits for indicating the selection of the PDCCH monitoring behavior; a maximum number of PDCCH monitoring behaviors supported by the UE; a maximum number of PDCCH skipping durations supported by the UE; or a maximum number of SSSGs supported by the UE.
  5. The method of claim 1, wherein: before determining the PDCCH monitoring behavior based on the DCI message, the method further comprises determining a bit-width of the DCI field; determining the PDCCH monitoring behavior based on the DCI message comprises: determining the PDCCH monitoring behavior based on the DCI message and the bit-width of the DCI field; and determining the bit-width of the DCI field comprises determining the bit-width of the DCI field according to at least one of: a higher layer signaling; a UE capability of the UE; a predefined value; or a DCI format of the DCI message.
  6. The method of claim 1, wherein: one or more codepoints in the DCI field are mapped to PDCCH monitoring behaviors belong to a same PDCCH monitoring behavior subset if a bit-width of the DCI field is 1, or when two types of PDCCH monitoring behaviors are configured, a codepoint in the DCI field is mapped to at least SSSG monitoring behavior associated with SSSG 0 and SSSG monitoring behavior associated with SSSG 1, or when M PDCCH skipping durations and no SSSG are configured, a codepoint in the DCI field indicates no skipping for PDCCH monitoring if the codepoint has all zero value, M being an integer less than 4, or in response to two types of PDCCH monitoring behaviors being configured to the UE, determining a bit-width of the DCI field to be 2.
  7. The method of claim 1, wherein: when the codepoint is 00, the codepoint indicates starting to monitor SSSG 0; when the codepoint is 01, the codepoint indicates starting to monitor SSSG 1; when the codepoint is 10, the codepoint indicates skipping monitoring PDCCH for a preconfigured duration; and when the codepoint is 11, the codepoint is not mapped to any PDCCH monitoring behavior.
  8. A method performed by a wireless communication node, comprising: transmitting, to a User Equipment, UE, a configuration message comprising configuration information; and transmitting, to the UE, a downlink control information, DCI, message comprising a DCI field, wherein a codepoint of the DCI field is mapped to a Physical Downlink Control Channel, PDCCH, monitoring behavior from a PDCCH monitoring behavior set comprising multiple PDCCH monitoring behaviors, wherein the DCI message triggers the UE to apply the PDCCH monitoring behavior, wherein the PDCCH monitoring behavior set comprises: a first PDCCH monitoring behavior subset comprising at least one of following: deactivating PDCCH monitoring skipping; or a list of PDCCH monitoring skipping behaviors, each PDCCH monitoring skipping behaviors being associated with a skipping duration; and a second PDCCH monitoring behavior subset comprising a list of Search Space Set Group, SSSG, monitoring behaviors, wherein the configuration information comprises at least one of: a set of durations associated with the first PDCCH monitoring behavior subset; or a set of SSSGs associated with the second PDCCH monitoring behavior subset.
  9. The method of claim 8, wherein: the set of SSSGs comprises a first type SSSG; and the set of SSSGs does not co-exist in the PDCCH monitoring behavior set with the set of durations in the configuration information; and the first type SSSG comprises: an SSSG configured without a search space set; an SSSG associated with an index greater than or equal to 2 indicating there are more than 2 SSSGs in the set of SSSGs; a dormant SSSG; or an SSSG associated with which the UE can stop monitoring PDCCH for a duration.
  10. The method of claim 8, wherein the list of SSSG monitoring behaviors comprises at least one of: stopping monitoring a Search Space Set, SSS, associated with a first SSSG and a second SSSG, and monitoring an SSS associated with a third SSSG; stopping monitoring an SSS associated with the first SSSG and the third SSSG and monitoring an SSS associated with the second SSSG; or stopping monitoring an SSS associated with the second SSSG and the third SSSG and monitoring an SSS associated with the first SSSG, or wherein the PDCCH monitoring behavior set is determined by at least one of: a UE capability of the UE; a pre-determined value; or a bit-width of the DCI field.
  11. A User Equipment, UE, comprising a memory for storing computer instructions and a processor in communication with the memory, wherein, when the processor executes the computer instructions, the processor is configured to cause the UE to: receive, from a wireless communication node, a configuration message comprising configuration information; receive, from the wireless communication node, a downlink control information, DCI, message comprising a DCI field, wherein a codepoint of the DCI field is mapped to a Physical Downlink Control Channel, PDCCH, monitoring behavior from a PDCCH monitoring behavior set comprising multiple PDCCH monitoring behaviors; determine the PDCCH monitoring behavior based on the DCI message; and apply the PDCCH monitoring behavior, wherein the PDCCH monitoring behavior set comprises: a first PDCCH monitoring behavior subset comprising at least one of following: deactivating PDCCH monitoring skipping; and a list of PDCCH monitoring skipping behaviors, each PDCCH monitoring skipping behaviors being associated with a skipping duration; and a second PDCCH monitoring behavior subset comprising a list of Search Space Set Group, SSSG, monitoring behaviors, wherein the configuration information comprises at least one of: a set of durations associated with the first PDCCH monitoring behavior subset; and a set of SSSGs associated with the second PDCCH monitoring behavior subset.

Description

TECHNICAL FIELD This disclosure is directed generally to wireless communications, and particularly to methods and a device for saving User Equipment (UE) power consumption. BACKGROUND Energy efficiency is a key performance index in the wireless communication network. Controlling power consumption and reducing energy cost is critical for developing and deploying a wireless communication network. Energy saving technology is plays an essential role in achieving this goal. From a UE perspective, UE battery life has great impact on user experience. It is beneficial to have the capability to dynamically control the power consumption of a UE yet still meet performance requirement. WO 2021/098052 A1, US 2021/266841 A1, US 2020/229092 A1, and US 2020/389874 A1 are related prior art documents. SUMMARY The invention is specified by the independent claims. Preferred embodiments are defined in the dependent claims. In the following description, although numerous features may be designated as optional, it is nevertheless acknowledged that all features comprised in the independent claims are not to be read as optional. Objects of the invention are methods and a device according to the appended independent claims for saving UE power consumption in wireless. Preferred embodiments are covered by the appended dependent claims. communications. In some embodiments, a method performed by a UE in a wireless network is disclosed. The method may include receiving, from a wireless communication node, a configuration message comprising configuration information associated with a Physical Downlink Control Channel (PDCCH) monitoring behavior set; receiving, from the wireless communication node, a control message indicating a PDCCH monitoring behavior from the PDCCH monitoring behavior set or a PDCCH monitoring behavior associated with the PDCCH monitoring behavior set; and determining the PDCCH monitoring behavior based on the control message. In some embodiments, a method performed by a wireless communication node in a wireless network is disclosed. The method may include transmitting, to a User Equipment (UE) in the wireless network, a configuration message comprising configuration information associated with a Physical Downlink Control Channel (PDCCH) monitoring behavior set; and transmitting, to the UE, a control message indicating a PDCCH monitoring behavior from the PDCCH monitoring behavior set or a PDCCH monitoring behavior associated with the PDCCH monitoring behavior set. In some embodiments, there is a UE and/or a wireless communication node comprising a processor and a memory, wherein the processor is configured to read code from the memory and implement any methods recited in any of the embodiments. In some embodiments, a computer program product comprising a computer-readable program medium code stored thereupon, the code, when executed by a processor, causing the processor to implement any method recited in any of the embodiments. The above embodiments and other aspects and alternatives of their implementations are described in greater detail in the drawings, the descriptions, and the claims below. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an example wireless communication network.FIG. 2 shows an example wireless network node.FIG. 3 shows an example user equipment.FIG. 4 shows exemplary steps for controlling UE PDCCH monitoring behavior in the wireless communication network.FIG. 5 shows an exemplary mapping of codepoints with PDCCH monitoring behaviors. DETAILED DESCRIPTION Wireless Communication Network FIG. 1 shows an exemplary wireless communication network 100 that includes a core network 110 and a radio access network (RAN) 120. The core network 110 further includes at least one Mobility Management Entity (MME) 112 and/or at least one Access and Mobility Management Function (AMF). Other functions that may be included in the core network 110 are not shown in FIG. 1. The RAN 120 further includes multiple base stations, for example, base stations 122 and 124. The base stations may include at least one evolved NodeB (eNB) for 4G LTE, or a Next generation NodeB (gNB) for 5G New Radio (NR), or any other type of signal transmitting/receiving device such as a UMTS NodeB. The eNB 122 communicates with the MME 112 via an S1 interface. Both the eNB 122 and gNB 124 may connect to the AMF 114 via an Ng interface. Each base station manages and supports at least one cell. For example, the base station gNB 124 may be configured to manage and support cell 1, cell 2, and cell 3. The gNB 124 may include a central unit (CU) and at least one distributed unit (DU). The CU and the DU may be co-located in a same location, or they may be split in different locations. The CU and the DU may be connected via an F1 interface. Alternatively, for an eNB which is capable of connecting to the 5G network, it may also be similarly divided into a CU and at least one DU, referred to as ng-eNB-CU and ng-eNB-DU, respectively. The ng-eNB-CU and the n