WO2023201527A1

WO2023201527A1 - Methods and apparatus of measurement in a radio system

Info

Publication number: WO2023201527A1
Application number: PCT/CN2022/087700
Authority: WO
Inventors: Miao Wang; Tsang-Wei Yu
Original assignee: Mediatek Singapore Pte. Ltd.
Priority date: 2022-04-19
Filing date: 2022-04-19
Publication date: 2023-10-26
Also published as: CN116916344A

Abstract

Aspects of the disclosure provide methods and apparatus to allow UE to speed up the measurement on some measurement objects. Base station configures same or different weights for different frequency layers or measurement objects. BS can configure one or more than one weight factor for the same MO and configure the conditions for each weight factor.

Description

METHODS AND APPARATUS OF MEASUREMENT IN A RADIO SYSTEM

TECHNICAL FIELD

The present invention relates generally to wireless communication systems, and more particularly, the methods and apparatus of measurement in a wireless communication system.

BACKGROUND

Measurement is a key function to support mobility and work effectively in a wireless communication system. At present, there are already a lot kinds of measurements, such as L3 measurement on intra-frequency and inter-frequency in the same RAT, L1 measurement on intra-frequency and inter-frequency in the same RAT, L3 inter-frequency measurement in other RATs, measurement on NTN frequency, measurement for positioning, RSSI/CO measurement. With the rapid development of mobile communication system, UE is required to measure more and more frequencies for more and more use cases. Due to the limit of UE implementation, UE usually performs measurement on inter-frequency in gap. Even the measurement on intra-frequency has to be performed in gap in some cases. With the demands of measurement on more frequencies, measurement delay on each frequency will get longer and longer or more independent gaps should be used and cause more interruptions on serving cell (s) .

Considering the purpose of each measurement, some need UE to measure more timely, such as L1 measurement for beam management. Some may not need UE to measure quite often, such as measurement just for network optimization. In NR, as intra-frequency may also be measured within gap. A MeasGapSharingScheme is specified to split measurement opportunity between intra-frequency and inter-frequency in a gap occasion. However, all the inter-frequency measurements are treated equally. When there are multiple inter-frequencies to measure, the measurement delay would be quite long especially for FR2 due to beam sweeping. The delay is not acceptable for L1 measurement. Therefore, new schemes should be designed to speed up the measurement on some frequency layers.

SUMMARY

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

In an aspect of the disclosure, in order to speed up the measurement on some object, measurement weight factor is introduced in the scheme. Base station can configure different or same measurement weight factor for different measure objects. BS can configure one or more than one weight factor for the same MO and configure the conditions for the use each weight factor.

In another aspect of the disclosure, UE performs measurement based on the configured measure objects and corresponding measurement weight factor. The larger the measurement weight factor is, more frequently the UE measures on the corresponding measure object. Suppose the configuration is: f ₁ with w ₁, f ₂ with w ₂, ……, f _N with w _N. The larger the measurement weight factor is, more frequently the UE measures on the corresponding measure object. In gap occasion t ₁, suppose f ₁, f ₂, f ₄, f ₅ are to be measured. The measurement opportunity of the four frequencies are w ₁/ (w ₁+w ₂+w ₄+w ₅) , w ₂/ (w ₁+w ₂+w ₄+w ₅) , w ₄/ (w ₁+w ₂+w ₄+w ₅) , w ₅/ (w ₁+w ₂+w ₄+w ₅) . CSSF (carrier-specific scaling factor) which scales the measurement delay requirements is the maximum one among 1/t _i.

Aspects of the disclosure provide a user equipment (UE) . The UE can include circuitry configured to perform measurement on different MOs according to the method.

Aspects of the disclosure provide a non-transitory computer readable medium storing instructions the implements the method.

BRIEF DESCRIPTION OF THE DRAWINGS

Various embodiments of this disclosure that are proposed as examples will be described in detail with reference to the following figures, wherein like numerals reference like elements, and wherein:

Fig. 1 (a) is a schematic system diagram illustrating an exemplary Base Station (i.e. BS) , in accordance with certain aspects of the disclosure.

Fig. 1 (b) is a schematic system diagram illustrating an exemplary UE, in accordance with certain aspects of the disclosure.

Fig. 2 illustrates an exemplary NR wireless communication system, in accordance with certain aspects of the disclosure.

Fig. 3 shows an example on how to calculate measurement opportunity of each frequency with equal measurement weight factor.

Fig. 4 shows an example on how to calculate measurement opportunity of each frequency with different measurement weight factor.

DETAILED DESCRIPTION OF EMBODIMENTS

The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

Aspects of the present disclosure provide methods, apparatus, processing systems, and computer readable mediums for NR (new radio access technology, or 5G technology) or other radio access technology. NR may support various wireless communication services. These services may have different quality of service (QoS) requirements e.g. latency, connected density and reliability requirements. Figure 1 (a) is a schematic system diagram illustrating an exemplary Base Station (i.e. BS) . The BS may also be referred to as an access point, an access terminal, a base station, a Node-B, an eNode-B, a gNB, or by other terminology used in the art. As an example, base stations serve a number of mobile stations within a serving area, for example, a cell, or within a cell sector. The Base Station has an antenna, which transmits and receives radio signals. A RF transceiver, coupled with the antenna, receives RF signals from antenna, converts them to baseband signals, and sends them to processor. RF transceiver also converts received baseband signals from processor, converts them to RF signals, and sends out to antenna. Processor processes the received baseband signals and invokes different functions. Memory stores program instructions and data to control the operations of Base Station. Figure 1 (b) is a schematic system diagram illustrating an exemplary UE. The UE may also be referred to as a mobile station, a mobile terminal, a mobile phone, smart phone, wearable, an IoT device, a table let, a laptop, or other terminology used in the art. UE has an antenna, which transmits and receives radio signals. A RF transceiver, coupled with the antenna, receives RF signals from antenna, converts them to baseband signal, and sends them to processor. RF transceiver also converts received baseband signals from processor, converts them to RF signals, and sends out to antenna. Processor processes the received baseband signals and invokes different functional modules to perform features in UE. Memory stores program instructions and data to control the operations of mobile station. Figure 2 illustrates an exemplary NR wireless communication system. Different protocol split options between Central Unit and Distributed Unit of gNB nodes may be possible. In one embodiment, SDAP and PDCP layer are located in the central unit, while RLC, MAC and PHY layers are located in the distributed unit.

In traditional cellular system, all the inter-frequency measurement objects are measured with the same opportunity in a gap occasion as shown in Figure. 3. Fig. 3 illustrates an exemplary diagram on how to calculate measurement opportunity of each frequency with equal measurement weight factor. As shown in the figure, there are totally five inter-frequency MOs to measure within gaps, L3 measurement on f1～f4 and L1 measurement on f2. Take gap occasion#1 and #2 as an example. In gap occasion#1, there are totally 4 inter-frequency MOs that can be measured. As the measurement weight factor for all these MOs are 1, the measurement opportunity of each MO is 1/4. In gap occasion#2, there are totally 3 inter-frequency MOs that can be measured. As the measurement weight factor for all these MOs are 1, the measurement opportunity of each MO is 1/3. CSSF (carrier-specific scaling factor) of each MO is as following table.

MO	CSSF
L3 f1
	4
L3 f2	4
L1 f2	4
L3 f3	4
L3 f4	3

In this scheme, base station configures different or same measurement weight factor for different measure objects. Since a UE can be configured with different kinds of measurement gap. Here the measurement weight factor applies for measurement in per-UE measurement gap, per-FR measurement gap, network controlled small gap but not limits to the above. Suppose the configuration is f ₁ with w ₁, f ₂ with w ₂, ……, f _N with w _N, where f _i is the frequency layer corresponding to a MO (measurement object) or >=2 MOs. f _i and f _j may be two frequency layers of the same frequency but related to different MOs. Here w _i can be configured for each frequency layer or each MO. When w _i is configured for each MO and f _i is corresponding to multiple MOs, choose the largest w _i. UE performs measurement based on the configured measure objects and corresponding measurement weight factor. The larger the measurement weight factor is, more frequently the UE measures on the corresponding measure object. The measurement opportunity of each frequency layer in each gap occasion is calculated as follows: In gap occasion t ₁, suppose f ₁, f ₂, f ₄, f ₅ are to be measured. The measurement opportunity of the four frequencies are p _1, t1=w ₁/ (w ₁+w ₂+w ₄+w ₅) , p _2, t1=w ₂/ (w ₁+w ₂+w ₄+w ₅) , p _4, t1=w ₄/ (w ₁+w ₂+w ₄+w ₅) , p _5, t1=w ₅/ (w ₁+w ₂+w ₄+w ₅) . CSSF (carrier-specific scaling factor) is the maximum one among {1/p _i, t1, 1/p _i, t2, 1/p _i, t3, …, 1/p _i, tK} for f _i and K=160/MGRP. CSSF is a factor that scales the measurement delay requirements.

An example is given in Fig. 4. Suppose network configures MO_1 L3 f1 inter &MO_2 L3 f2 &MO_4 L3 f3 inter &MO_5 L3 f4 inter with measurement weight factor 1, and MO_3 L1 f2 inter with measurement weight factor 5. As shown in Fig. 4, take gap occasion#1 and #2 as an example. In gap occasion#1, there are totally 4 inter-frequency MOs that can be measured. As the measurement weight factor for three of these MOs are 1 and the measurement weight factor for MO_3 is 5, the measurement opportunity of MO_3 is 5/8 and the measurement opportunities of MO_ {1, 2, 4} are all 1/8. In gap occasion#2, there are totally 3 inter-frequency MOs that can be measured. As the measurement weight factor for MO_1 and MO_5 are 1 and the measurement weight factor for MO_3 is 5, the measurement opportunity of MO_3 is 5/7 and the measurement opportunities of MO_1 and MO_5 are both 1/7. CSSF (carrier-specific scaling factor) of each MO is as following table.

MO	CSSF
L3 f1
	8
L3 f2	8
L1 f2	8/5
L3 f3	8
L3 f4	7

BS can configure one or more than one weight factor for the same MO and configure the conditions for the use each weight factor. The conditions can be no detectable neighbour cells of some frequency or some RAT, or/and the quality of the serving cell or/and detectable cells of some frequency or some RAT or some MO below/above the threshold, where the thresholds can be different for different cells or frequencies or RATs or MOs. An example is given as below: the weight factors for LTE MOs are configured as 1/3 and the condition is that at least RSRP of one of the detected NR cells including the serving cell is above -100dBm. When this condition is met, the weight factor 1/3 is used for LTE MOs, otherwise default factor 1 is used.

It is understood that the specific order or hierarchy of blocks in the processes /flowcharts disclosed is an illustration of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of blocks in the processes /flowcharts may be rearranged. Further, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more. ” The word “exemplary” is used herein to mean “serving as an example, instance, or illustration. ” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words “module, ” “mechanism, ” “element, ” “device, ” and the like may not be a substitute for the word “means. ” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for. ”

While aspects of the present disclosure have been described in conjunction with the specific embodiments thereof that are proposed as examples, alternatives, modifications, and variations to the examples may be made. Accordingly, embodiments as set forth herein are intended to be illustrative and not limiting. There are changes that may be made without departing from the scope of the claims set forth below.

Claims

A method of measurement gap sharing comprising:

Base station (BS) configures different or same measurement weight factor for different measurement objects (MO) . Suppose f ₁ with w ₁, f ₂ with w ₂, ……, f _N with w _N, where f _i is the frequency layer corresponding to a MO or >=2 MOs. Therefore, f _i and f _j can be two frequency layers of the same frequency but related to different MOs. w _i equals to 1 if not configured.

The measurement gap here contains per-UE measurement gap, per-FR measurement gap, network controlled small gap but not limits to the above.
The method of claim 1, wherein w _i can be configured for each frequency layer or each MO. When wi is configured for each MO and fi is corresponding to multiple MOs, choose the largest w _i.
The method of claim 1, wherein BS can configure one or more than one weight factor for the same MO and configure the conditions for the use each weight factor.
The method of claim 3, wherein the conditions can be no detectable neighbour cells of some frequency or some RAT, or/and the quality of the serving cell or/and detectable cells of some frequency or some RAT or some MO below/above the threshold,

where the thresholds can be different for different cells or frequency or RAT or MO.
The method of claim 1, wherein UE performs measurement based on the configured measure objects and corresponding measurement weight factor. The larger the measurement weight factor is, more frequently the UE measures on the corresponding measure object.
The method of claim 5, wherein UE calculates the measurement opportunity of each frequency layer considering the measurement weight factor.
The method of claim 6, wherein the measurement opportunity of each frequency layer in each gap occasion is: In gap occasion t ₁, suppose f ₁, f ₂, f ₄, f ₅ are to be measured. The measurement opportunity of the four frequencies are p _1, t1=w ₁/ (w ₁+w ₂+w ₄+w ₅) , p _2, t1=w ₂/ (w ₁+w ₂+w ₄+w ₅) , p _4, t1=w ₄/ (w ₁+w ₂+w ₄+w ₅) , p _5, t1=w ₅/ (w ₁+w ₂+w ₄+w ₅) .
The method of claim 7, wherein CSSF (carrier-specific scaling factor) is the maximum one among {1/p _i, t1, 1/p _i, t2, 1/p _i, t3, …, 1/p _i, tK} for f _i and K=160/MGRP. CSSF is a factor that scales the measurement delay requirements.
A user equipment (UE) , comprising circuitry configured to: receive the configured measurement weight factor for each MO and the conditions for each measurement weight factor.
The UE of claim 9, wherein the circuitry is further configured to:

determine the measurement opportunity for each MO according to the configured measurement weight factor.