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JP-7855320-B2 - Communication equipment, base stations, and communication methods

JP7855320B2JP 7855320 B2JP7855320 B2JP 7855320B2JP-7855320-B2

Inventors

  • 曽我部 治彦
  • ▲高▼橋 秀明

Assignees

  • 株式会社デンソー
  • トヨタ自動車株式会社

Dates

Publication Date
20260508
Application Date
20210709

Claims (15)

  1. A receiving unit (121) receives from a base station (200) first information relating to a static criterion and information for specifying the period over which fluctuations in the received level value applied to the static criterion are evaluated. The system includes a control unit (140) that receives second information regarding non-cell edge criteria from the base station, and performs a relaxation measurement when the stationary criteria and the non-cell edge criteria are met and the base station receives third information instructing it to perform a relaxation measurement, If the control unit has not received the third information from the base station, it determines whether the static criterion is met during the period in which the fluctuation of the received level value applied to the static criterion is evaluated, and based on that determination, it selects to perform the relaxation measurement. The control unit, If no information is set to specify a threshold for the reception quality value applied to the non-cell edge criterion, it is determined whether the non-cell edge criterion is met based on the threshold for the reception level value applied to the non-cell edge criterion. If information is set to specify a threshold value for the reception quality value to be applied to the non-cell edge criterion, the communication device (100) determines whether the non-cell edge criterion is met based on the threshold value for the reception level value and the threshold value for the reception quality value to be applied to the non-cell edge criterion.
  2. The communication device according to claim 1, wherein the threshold value of the received level applied to the non-cell end criterion is included in the second information.
  3. The communication device according to claim 1 or 2, wherein the receiving unit receives a system information block from the base station, which includes the first information, information for specifying a period for which fluctuations in the received level value are evaluated, and the second information.
  4. The first information indicates a first value as a threshold value for the received level value applied to the stationary criterion, The communication device according to claim 1 or 2, wherein the control unit determines whether the static criterion is met based on the reference signal received power (RSRP) of the serving cell and the first value.
  5. The second piece of information indicates a second value as a threshold value for the received level value applied to the non-cell edge criterion, The communication device according to claim 4, wherein the control unit determines whether the criteria for the non-cell end are met based on the second value.
  6. The communication device according to claim 5, wherein the control unit determines whether the non-cell edge criterion is met based on the second value, the reference signal reception quality (RSRQ) of the serving cell, and the third value, in addition to the second value, if the second information further indicates a third value as a threshold for the reception quality value applied to the non-cell edge criterion.
  7. The communication device according to claim 1 or 2, wherein the control unit selects at least one of the following measurements as the relaxation measurement: measurement on an intra-frequency cell and measurement on an inter-frequency cell.
  8. The communication device according to claim 1 or 2, wherein the communication device is a Red Cap (Reduced Capability) user device.
  9. A transmitting unit that transmits to a communication device (100) first information relating to a static criterion and information for specifying a period during which fluctuations in the received level value applied to the static criterion are evaluated. The system includes a control unit that controls the communication device to perform the relaxation measurement when the stationary criterion and the non-cell edge criterion are met , by transmitting a second piece of information regarding the non-cell edge criterion to the communication device and a third piece of information instructing the communication device to perform the relaxation measurement, The control unit, If the third information has not been transmitted to the communication device, the system will determine whether the static criterion is met during the period in which the fluctuation of the received level value applied to the static criterion is evaluated, and will control the communication device to select the execution of the relaxation measurement based on that determination . If information for specifying a threshold value for the reception quality value applied to the non-cell edge criterion is not set in the communication device, the communication device is controlled to determine whether the non-cell edge criterion is met based on the threshold value for the reception level value applied to the non-cell edge criterion. If information for specifying the threshold value of the reception quality applied to the non-cell edge criterion is set in the communication device, the communication device will be controlled to determine whether the non-cell edge criterion is met based on the threshold value of the reception level applied to the non-cell edge criterion and the threshold value of the reception quality applied to the non-cell edge criterion. Base station (200).
  10. The base station according to claim 9, wherein the threshold value of the received level applied to the non-cell end criterion is included in the second information.
  11. The base station according to claim 9 or 10, wherein the transmitting unit transmits a system information block to the communication device, the system information block comprising the first information, information for specifying a period for which fluctuations in the received level value are evaluated, and the second information.
  12. The base station according to claim 9 or 10, wherein in the communication device, at least one of the measurements of an intra-frequency cell and an inter-frequency cell is performed as the relaxation measurement.
  13. The base station according to claim 9 or 10, wherein the communication device is a Red Cap (Reduced Capability) user device.
  14. A communication method performed by a communication device (100), The steps include receiving from a base station (200) first information relating to a static criterion and information specifying a period for which fluctuations in the received level value applied to the static criterion are evaluated, The steps include: receiving second information regarding non-cell edge criteria from the base station, and performing the relaxation measurement when the stationary criteria and the non-cell edge criteria are met and receiving third information from the base station instructing to perform the relaxation measurement; If the third information has not been received from the base station, the steps include determining whether the static criterion is met during the period in which the fluctuation of the received level value applied to the static criterion is evaluated, and selecting to perform the relaxation measurement based on that determination, If no information is set to specify a threshold for the reception quality value applied to the non-cell edge criterion, the step of determining whether the non-cell edge criterion is met based on a threshold for the reception level value applied to the non-cell edge criterion, A communication method comprising: if information for specifying a threshold for the received quality value applied to the non-cell edge criterion is set, determining whether the non-cell edge criterion is satisfied based on the threshold for the received level value applied to the non-cell edge criterion and the threshold for the received quality value applied to the non-cell edge criterion.
  15. A communication method performed at a base station (200), The steps include transmitting to a communication device (100) first information relating to a static criterion and information specifying a period for which fluctuations in the received level value applied to the static criterion are evaluated, The method includes the step of controlling the communication device to perform the relaxation measurement when the stationary criterion and the non-cell edge criterion are met , by transmitting a second piece of information relating to a non-cell edge criterion to the communication device and a third piece of information instructing the communication device to perform the relaxation measurement, If the third information has not been transmitted to the communication device, the steps include: determining whether the static criterion is met during the period in which fluctuations in the received level value applied to the static criterion are evaluated, and controlling the communication device to select to perform the relaxation measurement based on the determination; If information for specifying a threshold value for reception quality applied to the non-cell edge criterion has not been set in the communication device, the communication device is controlled to determine whether the non-cell edge criterion is met based on a threshold value for reception level applied to the non-cell edge criterion. A communication method comprising: if information for specifying a threshold value for the reception quality value applied to the non-cell edge criterion is set in the communication device, controlling the communication device to determine whether the non-cell edge criterion is met based on the threshold value for the reception level value applied to the non-cell edge criterion and the threshold value for the reception quality value applied to the non-cell edge criterion.

Description

This invention relates to user equipment, a base station, and a communication control method used in a mobile communication system. In recent years, the 3GPP (3rd Generation Partnership Project), a standardization project for mobile communication systems, has been considering providing specific user devices with reduced communication capabilities compared to general user devices in 5G systems (see Non-Patent Literature 1). These specific user devices are mid-range performance and price-effective user devices for IoT (Internet of Things) applications. For example, compared to general user devices, they may have a narrower maximum bandwidth for wireless communication or fewer receivers. Furthermore, it has been agreed to introduce a method for easing the measurement of wireless quality to adjacent cells based on RSRP (Reference Signal Received Power)/RSRQ (Reference Signal Received Quality) based stationary criteria (RSRP/RSRQ-based stationary criterion) for specific user devices in an RRC-connected state (so-called RRM relaxation; hereinafter referred to as the measurement relaxation method as appropriate) (see Non-Patent Document 2). Because stationary user devices experience minimal fluctuations in the wireless environment, frequent wireless quality measurements to adjacent cells are unnecessary. By considering stationary user devices as stationary when they meet the stationary criteria, the number of measurements can be reduced through a measurement relaxation method. This leads to power savings and improved battery life. 3GPP contribution “RP-201677”3GPP contribution R2-2106472” This diagram shows the configuration of a mobile communication system according to an embodiment.This figure shows an example of the configuration of a protocol stack according to the embodiment.This diagram shows the configuration of the UE according to the embodiment.This is a diagram showing the configuration of a base station according to the embodiment.This is a sequence diagram illustrating the first and third operation examples of the mobile communication system according to the embodiment.This figure shows an example of information according to the embodiment.This figure shows an example of information according to the embodiment.This is a diagram illustrating a first example of operation of a mobile communication system according to an embodiment.This is a diagram illustrating a first example of operation of a mobile communication system according to an embodiment.This is a diagram illustrating a first example of operation of a mobile communication system according to an embodiment.This is a diagram illustrating a first example of operation of a mobile communication system according to an embodiment.This is a sequence diagram illustrating a second example of operation of the mobile communication system according to the embodiment.This figure shows an example of information according to the embodiment.This is a diagram illustrating a first example of operation of a mobile communication system according to an embodiment.This figure shows an example of information according to the embodiment.This is a diagram illustrating a third example of operation of the mobile communication system according to the embodiment.This figure shows an example of information according to the embodiment.This is a diagram illustrating a fourth example of operation of the mobile communication system according to the embodiment.This figure shows an example of information according to the embodiment.This is a sequence diagram illustrating a fifth example of operation of the mobile communication system according to the embodiment.This is a diagram illustrating a fifth example of operation of the mobile communication system according to the embodiment.This is a diagram illustrating a fifth example of operation of the mobile communication system according to the embodiment. The mobile communication system according to the embodiment will be described with reference to the drawings. In the drawings, identical or similar parts are denoted by the same or similar reference numerals. (System configuration) First, the configuration of the mobile communication system 1 according to this embodiment will be described with reference to Figure 1. The mobile communication system 1 is, for example, a system that conforms to the Technical Specifications (TS) of 3GPP. In the following, the mobile communication system 1 will be described using a mobile communication system based on the 5th Generation System (5GS) of the 3GPP standard, that is, a mobile communication system based on NR (New Radio), as an example. The mobile communication system 1 comprises a network 10 and a user equipment (UE) 100 that communicates with the network 10. The network 10 includes a 5G radio access network, NG-RAN (Next Generation Radio Access Network) 20, and a 5G core network, 5GC (5G Core Network) 30. UE100 is a device used by a user. UE100 is a mobile device such as a smartphone or ot