Neighbor cell measurement for intra-band non-co-located carrier aggregation
By determining co-location groups and selecting reference carriers for neighbor cell measurements, the UE optimizes measurement processes in non-co-located carrier aggregation scenarios, reducing power consumption and resource usage.
Patent Information
- Application Number
- PCT/CN2024/107032
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2026-01-29
AI Technical Summary
In cellular networks, non-co-located carrier aggregation scenarios lead to increased UE measurements, reducing battery life and processing resources due to the inability to leverage co-location principles.
The UE determines co-location groups for intra-band carrier aggregation component carriers and selects reference carriers for neighbor cell measurements, optimizing measurement processes without requiring all carriers to be measured individually.
This approach reduces the number of necessary UE measurements, conserving power and network resources while maintaining effective neighbor cell assessment.
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Figure CN2024107032_29012026_PF_FP_ABST
Abstract
Description
Neighbor Cell Measurement for Intra-Band Non-Co-located Carrier AggregationTECHNICAL FIELD
[0001] The present disclosure generally relates to wireless communication, and in particular, to neighbor cell measurement for intra-band non-co-located carrier aggregation.BACKGROUND
[0002] In cellular networks, cells may be co-located, which means that the cells are deployed at the same physical location. When there are multiple co-located cells that are neighbor cells in a carrier aggregation (CA) scenario, a user equipment (UE) may reduce the number of measurements needed for neighbor cells, e.g., the UE may assume that the channel quality measured for one of the co-located cells sufficiently indicates the channel quality for one or more of the co-located neighbor cells. For example, one component carrier (CC) measurement in one band is sufficient for all CCs in the same band.
[0003] However, if CA neighbor cells are not co-located, the UE cannot take advantage of the co-location principles. This may lead to the UE having to make more measurements in the non-co-located scenario leading to reduced battery life and an increase in use of processing resources.SUMMARY
[0004] Some example embodiments are related to an apparatus having processing circuitry configured to determine neighbor cell measurements for a set of intra-band carrier aggregation (CA) component carriers (CCs) are to be performed wherein at least one neighbor cell transmitting reference signals (RS) on a first CC to be measured is non-co-located with neighbor cells transmitting RSs on additional CCs to be measured, select CCs of the set of intra-band CA CCs for which neighbor cell measurements are performed and generate, for transmission to a network, measurement results comprising the neighbor cell measurements of the selected CCs.
[0005] Other example embodiments are related to a method for determining neighbor cell measurements for a set of intra-band carrier aggregation (CA) component carriers (CCs) are to be performed wherein at least one neighbor cell transmitting reference signals (RS) on a first CC to be measured is non-co-located with neighbor cells transmitting RSs on additional CCs to be measured, selecting CCs of the set of intra-band CA CCs for which neighbor cell measurements are performed and generating, for transmission to a network, measurement results comprising the neighbor cell measurements of the selected CCsBrief Description of the Drawings
[0006] Fig. 1 shows an example network arrangement according to various example embodiments.
[0007] Fig. 2 shows an example user equipment (UE) according to various example embodiments.
[0008] Fig. 3 shows an example base station according to various example embodiments.
[0009] Fig. 4 shows an example deployment scenario where some component carriers (CCs) of a CA combination are transmitted from non-co-located cells according to various example embodiments.
[0010] Fig. 5 shows an example method for selecting non-co-located CCs for measurement based on co-location groups according to various example embodiments.Detailed Description
[0011] The example embodiments may be further understood with reference to the following description and the related appended drawings, wherein like elements are provided with the same reference numerals. The example embodiments relate to neighbor cell measurements for CCs of a CA combination where some of the CCs are transmitted by cells that are non-co-located with other cells CA combination.
[0012] The example embodiments are described with regard to a UE.However, reference to a UE is merely provided for illustrative purposes. The example embodiments may be utilized with any electronic component that may establish a connection to an accessory device and is configured with the hardware, software, and / or firmware to exchange information and data with accessory devices. Therefore, the UE as described herein is used to represent any electronic component.
[0013] The example embodiments are also described with reference to a 5G New Radio (NR) network. However, the example embodiments may also be implemented in other types of networks, including but not limited to LTE networks, future evolutions of the cellular protocol (e.g., 5G-advanced networks, 6G networks, etc. ) , or any other type of network.
[0014] The example embodiments are described with reference to carrier aggregation (CA) . In CA, a UE may communicate in the downlink (DL) or uplink (UL) with multiple cells of a network to increase throughput. CA includes the UE associating with a Primary Cell (PCell) and one or more Secondary Cells (SCells) . Different band combinations of CA may be served by the PCell and SCell, e.g., the PCell may serve a first component carrier (CC) of a CA band combination (e.g., CC1) to the UE and the SCell may serve a second CC of the CA band combination (e.g., CC2) to the UE. Thus, in CA, both the PCell and the SCell are considered to be serving cells.
[0015] The example embodiments are also described with reference to a UE that is not in multiple reception (Rx) simultaneous reception mode, e.g., the UE does not support simultaneous measurement of intra-frequency neighbor cells. However, the example embodiments may also be used by UEs that support multiple Rx simultaneous reception mode.
[0016] Furthermore, the example embodiments are described with reference to CA that is using the Frequency Range 2 (FR2) bands. Specifically, the deployment scenario described by the example embodiments is a FR2 intra-band CA, non-contiguous CC combination. For example, FR2 may comprise the frequency range 24.25 GHz to 52.6 GHz that may comprise multiple bands, e.g., bands n257-n263. CCs in each band may have various channel bandwidths, e.g., 50 MHz, 100 MHz, 200 MHz, 400 MHz, etc. Intra-band CA describes a scenario where all the CCs of the CA combination are in the same band, e.g., FR2 band n257. Contiguous CCs refer to CCs that are adjacent in frequency to another CC. For example, if there is no gap (excluding guardbands) between a highest frequency of CC1 and a lowest frequency of CC2, these CCs are considered to be contiguous. Continuing with the example, if there is no gap (excluding guardbands) between a highest frequency of CC2 and a lowest frequency of CC3, these CCs are considered to be contiguous but CC1 and CC3 are also considered to be part of the contiguous group because there is an intervening contiguous CC, e.g., CC2. Thus, non-contiguous CCs are CCs that have a frequency gap with other CCs in the CA band combination without any intervening contiguous CCs. However, there is no requirement that the example embodiments only be used in FR2 CA deployments.
[0017] When a UE is operating in CA mode, the UE may be served CCs of the CA combination by serving cells, e.g., primary component carrier (PCC) , primary secondary component carrier (PSCC) , secondary component carrier (SCC) , etc. The UE may also perform neighbor cell measurements for one or more of the CCs of the CA combination. These neighbor cell measurements may be used by the network for a variety of reasons, e.g., mobility, location, handover, etc. These neighbor cell measurements are performed by the UE based on reference signals (RS) transmitted by the neighbor cells in the same CC as the serving cells. Thus, throughout this description, serving CCs may be considered to be the CCs of the CA combination which are currently being served to the UE. Whereas neighbor CCs are CCs transmitted by neighbor cells that correspond to the serving CCs for which neighbor cell measurements are to be performed. The example embodiments are related to these neighbor cell measurements that are performed on RS of CCs of a CA combination.
[0018] Some example embodiments provide manners of determining co-location groups for the CCs of the non-co-located CA combination, including the selecting of reference CCs for the co-location groups for which neighbor cell measurements are to be performed. Other example embodiments provide manners of selecting reference CCs for which neighbor cell measurements are to be performed without the use of co-location groups including being based on whether CCs are contiguous, network configuration or the types of neighbor cell measurements that are to be performed. Each of these example embodiments will be described in greater detail below.
[0019] Fig. 1 shows an example network arrangement 100 according to various example embodiments. The example network arrangement 100 includes a UE 110. The UE 110 may be any type of electronic component that is configured to communicate via a network, e.g., mobile phones, tablet computers, desktop computers, smartphones, embedded devices, wearables, Internet of Things (IoT) devices, etc. An actual network arrangement may include any number of UEs being used by any number of users. Thus, the example of one UE 110 is merely provided for illustrative purposes.
[0020] The UE 110 may be configured to communicate with one or more networks. In the example of the network arrangement 100, the network with which the UE 110 may wirelessly communicate is a 5G NR radio access network (RAN) 120. The UE 110 may also communicate with other types of networks (e.g., 5G cloud RAN, a next generation RAN (NG-RAN) , a legacy cellular network, etc. ) and the UE 110 may also communicate with networks over a wired connection. With regard to the example embodiments, the UE 110 may establish a connection with the 5G NR RAN 120. Therefore, the UE 110 may have a 5G NR chipset to communicate with the NR RAN 120.
[0021] The 5G NR RAN 120 may be portions of a cellular network that may be deployed by a network carrier (e.g., Verizon, AT&T, T-Mobile, etc. ) . The RAN 120 may include cells or base stations that are configured to send and receive traffic from UEs that are equipped with the appropriate cellular chip set. In this example, the 5G NR RAN 120 includes the gNB 120A and the gNB 120B. However, reference to a gNB is merely provided for illustrative purposes, any appropriate base station or cell may be deployed (e.g., Node Bs, eNodeBs, HeNBs, eNBs, gNBs, gNodeBs, macrocells, microcells, small cells, femtocells, etc. ) .
[0022] Any association procedure may be performed for the UE 110 to connect to the 5G NR RAN 120. For example, as discussed above, the 5G NR RAN 120 may be associated with a particular network carrier where the UE 110 and / or the user thereof has a contract and credential information (e.g., stored on a SIM card) . Upon detecting the presence of the 5G NR RAN 120, the UE 110 may transmit the corresponding credential information to associate with the 5G NR RAN 120. More specifically, the UE 110 may associate with a specific cell (e.g., gNB 120A) .
[0023] The network arrangement 100 also includes a cellular core network 130, the Internet 140, an I P Multimedia Subsystem (IMS) 150, and a network services backbone 160. The cellular core network 130 manages the traffic that flows between the cellular network and the Internet 140. The IMS 150 may be generally described as an architecture for delivering multimedia services to the UE 110 using the I P protocol. The IMS 150 may communicate with the cellular core network 130 and the Internet 140 to provide the multimedia services to the UE 110. The network services backbone 160 is in communication either directly or indirectly with the Internet 140 and the cellular core network 130. The network services backbone 160 may be generally described as a set of components (e.g., servers, network storage arrangements, etc. ) that implement a suite of services that may be used to extend the functionalities of the UE 110 in communication with the various networks.
[0024] Fig. 2 shows an example UE 110 according to various example embodiments. The UE 110 will be described with regard to the network arrangement 100 of Fig. 1. The UE 110 may represent any electronic device and may include a processor 205, a memory arrangement 210, a display device 215, an input / output (I / O) device 220, a transceiver 225, and other components 230. The other components 230 may include, for example, an audio input device, an audio output device, a battery that provides a limited power supply, a data acquisition device, ports to electrically connect the UE 110 to other electronic devices, sensors to detect conditions of the UE 110, etc.
[0025] The processor 205 may be configured to execute a plurality of engines for the UE 110. For example, the engines may include a neighbor cell measurement engine 235 for performing operations related to performing neighbor cell measurements on CCs of a CA combination where some of the CCs are non-co-located. The operations include, but are not limited to, determining co-location groups for the CCs of the non-co-located CA combination, including the selecting of reference CCs for the co-location groups for which neighbor cell measurements are to be performed, selecting reference CCs for which neighbor cell measurements are to be performed without the use of co-location groups including being based on whether CCs are contiguous, network configuration or the types of neighbor cell measurements that are to be performed and performing the neighbor cell measurements. Each of these example operations will be described in more detail below.
[0026] The above referenced engine being an application (e.g., a program) executed by the processor 205 is only example. The functionality associated with the engines may also be represented as a separate incorporated component of the UE 110 or may be a modular component coupled to the UE 110, e.g., an integrated circuit with or without firmware. For example, the integrated circuit may include input circuitry to receive signals and processing circuitry to process the signals and other information. The engines may also be embodied as one application or separate applications. In addition, in some UEs, the functionality described for the processor 205 is split among two or more processors such as a baseband processor and an applications processor. The example embodiments may be implemented in any of these or other configurations of a UE.
[0027] The memory arrangement 210 may be a hardware component configured to store data related to operations performed by the UE 110. The display device 215 may be a hardware component configured to show data to a user while the I / O device 220 may be a hardware component that enables the user to enter inputs. The display device 215 and the I / O device 220 may be separate components or integrated together such as a touchscreen.
[0028] The transceiver 225 may be a hardware component configured to establish a connection with the 5G NR-RAN 120, an LTE-RAN (not pictured) , a legacy RAN (not pictured) , a WLAN (not pictured) , etc. Accordingly, the transceiver 225 may operate on a variety of different frequencies or channels (e.g., set of consecutive frequencies) . The transceiver 225 includes circuitry configured to transmit and / or receive signals (e.g., control signals, data signals) . Such signals may be encoded with information implementing any one of the methods described herein. The processor 205 may be operably coupled to the transceiver 225 and configured to receive from and / or transmit signals to the transceiver 225. The processor 205 may be configured to encode and / or decode signals (e.g., signaling from a base station of a network) for implementing any one of the methods described herein.
[0029] Fig. 3 shows an example base station 300 according to various example embodiments. The base station 300 may represent the gNB 120A, the gNB 120B or any other access node through which the UE 110 may establish a connection and manage network operations.
[0030] The base station 300 may include a processor 305, a memory arrangement 310, an input / output (I / O) device 315, a transceiver 320, and other components 325. The other components 325 may include, for example, an audio input device, an audio output device, a battery, a data acquisition device, ports to electrically connect the base station 300 to other electronic devices and / or power sources, etc.
[0031] The processor 305 may be configured to execute a plurality of engines for the UE 110. For example, the engines may include a neighbor cell measurement configuration engine 330 for performing operations related to configuring a UE to perform neighbor cell measurements on CCs of a CA combination where some of the CCs are non-co-located. The operations include, but are not limited to, configuring the UE with co-location groups for the CCs of the non-co-located CA combination, configuring the UE with reference CCs for measurements and configuring the UE with information related to cells sites serving the CCs of the CA combination. Each of these example operations will be described in more detail below.
[0032] The memory arrangement 310 may be a hardware component configured to store data related to operations performed by the base station 300. The I / O device 315 may be a hardware component or ports that enable a user to interact with the base station 300. The transceiver 320 may be a hardware component configured to exchange data with the UE 110 and any other UE in the network arrangement 100.
[0033] The transceiver 320 may be a hardware component configured to exchange data with the UE 110 and any other UE in the network arrangement 100. The transceiver 320 may operate on a variety of different frequencies or channels (e.g., set of consecutive frequencies) . The transceiver 320 includes circuitry configured to transmit and / or receive signals (e.g., control signals, data signals) . Such signals may be encoded with information implementing any one of the methods described herein. The processor 305 may be operably coupled to the transceiver 320 and configured to receive from and / or transmit signals to the transceiver 320. The processor 305 may be configured to encode and / or decode signals (e.g., signaling from a UE) for implementing any one of the methods described herein.
[0034] As described above, the example embodiments relate to scenarios where CCs of CA scenario in FR2 are non-co-located. As described above, this may lead to an increase in neighbor cell measurements that are performed by a UE. The example embodiments introduce a concept termed a co-location group that will be described in further detail below. A co-location group may include the CCs that share the same location (e.g., are co-located) or semi-co-location in the FR2 band for one site or for one macro cell coverage. Semi-co-location is a scenario where the cells are not co-located but are deemed to be close enough that the channel quality should not be substantially different between the CCs based on location. An example of co-location groups is described with reference to Fig. 4.
[0035] Fig. 4 shows an example deployment scenario 400 where some component carriers (CCs) of a CA combination are transmitted from non-co-located cells according to various example embodiments. In this example, at site 410 that includes a macro cell coverage area 420, there are five (5) CCs in the same FR2 band. Three CCs (e.g., CC1 / CC2 / CC3) are co-located at a main site (e.g., gNB) and these CCs may be considered to be in the same co-location group. Two CCs (e.g., CC4 / CC5) are transmitted from a remote radio head (RRH) 430 that is a different site from the main site. Thus, CC4 / CC5 are not co-located with CC1 / CC2 / CC3. However, CC4 / CC5 are co-located with respect to each other and thus, CC4 / CC5 may be considered to be in the same co-location group.
[0036] At site 440 that includes a macro cell coverage area 450, there are five (5) CCs in the same FR2 band, CC1 / CC2 / CC3 / CC4 / CC5. Since all the CCs are at the same site 440, they may be considered to be co-located and in the same co-location group.
[0037] The deployment scenario shown in Fig. 4 is only an example and there are many different deployment scenarios that may be implemented resulting in different co-location groups and different numbers of co-location groups for a macro cell coverage area. The example of Fig. 4 is used to illustrate different solutions for neighbor cell measurements in the FR2 intra-band CA, non-contiguous CC combination scenario based on the concept of co-location groups.
[0038] In some example embodiments, the UE may measure neighbor cells on at least one CC for each co-location group in the FR2 band, e.g., the measurements on the at least one CC are valid for the other CCs in the co-location group. Thus, the UE may first determine the co-location groups to which each of the CCs belong to determine the number of measurements that may be performed, e.g., at least one CC for each co-location group.
[0039] The CC that is measured in each co-location group may be referred to as a reference CC. The CC that is selected as the reference CC for a co-location group may be based on various rules. In a first example rule, the reference CC may be a primary component carrier (PCC) when the UE is configured with stand-alone (SA) NR operation mode and the PCC is in the co-location group of the FR2 band. In a second example rule, the reference CC may be a primary secondary CC (PSCC) when the UE is configured with E-UTRAN New Radio–Dual Connectivity (EN-DC) and the PSCC is in the co-location group of the FR2 band. In a third example rule, the reference CC may be a PSCC when the UE is configured with NR-DC and the PSCC is in the co-location group of the FR2 band.
[0040] In a fourth example rule, the reference CC may be any of the secondary CCs (SCCs) on which the UE is configured to report synchronization signal block (SSB) based measurements when neither the PCC nor the PSCC is in the same co-location group of the FR2 band. In this fourth example rule, the selected SCC may be an SCC where the UE is configured with synchronization signal-Reference Signal Received Power (SS-RSRP) measurement reporting if such a SCC exists, otherwise the UE may select any SCC. When the UE selects the SCC, the UE may, for example, select the SCC by ranking SCC index, random selection, or based on the serving CCs quality / strength.
[0041] An example of these example embodiments may be described with reference to Fig. 4. For example, referring to site 410, in this example, the CC1 may be the PCC and CC2 / CC3 / CC4 / CC5 are SCCs. Thus, based on the above rules, for the co-location group that includes CC1 / CC2 / CC3, the UE may perform measurements on the CC1 (e.g., the PCC is the reference CC based on the above first example rule) and determine that the measurements of CC1 also represent measurements for the CC2 and CC3 that are in the same co-location group. Since CC4 / CC5 are in a different co-location group, the UE also has to select a reference CC for this co-location group. Since both CCs are SCCs, the UE may apply the fourth example rule. For example, if the UE is configured to report SSB based measurements for CC4, the UE may select CC4 as the reference CC for this co-location group and determine that the measurements of CC4 also represent measurements for the CC5. Thus, in this example of the macro cell coverage 420, the UE may only perform neighbor cell measurements for CC1 (from the first co-location group) and CC4 (from the second co-location group) .
[0042] As described above, before the UE performs neighbor cell measurements for different co-location groups, the UE may determine which CCs belong to which co-location group. There may be various manner for the UE to make this determination.
[0043] In a first option, the UE may use received timing differences (RTD) of serving CCs to determine the co-location group for each of the CCs. For example, the UE will be configured with information that allows the UE to determine the PCC and / or PSCC and / or SCC that are in the intra-band FR2 CA (e.g., which CCs are in the same band) . For these CCs in the same band, the UE may then use the RTD among the CCs in the same band to determine if the CCs are co-located (e.g., in the same co-location group) . For example, the UE may compare the RTD among the CCs to a threshold. If the RTD are below the threshold, the UE may consider the CCs to be co-located (e.g., in the same co-location group) . Otherwise CCs with an RTD greater than the threshold are not co-located (e.g., not in the same co-location group) .
[0044] This may be expressed as when the RTD <= T, the CCs are co-located, otherwise the CCs are not co-located. The value of T may be configured by the network (e.g., Radio Resource Control (RRC) signaling, Medium Access Control Control Element (MAC-CE) signaling, Downlink Control Information (DCI) signaling, etc. ) or predefined in standards, e.g., 3GPP Technical Specifications. In one example embodiment, the value of T may be 260ns. However, this is just an example value and other values of T may be used.
[0045] In most cases, a network uses the same deployment from site to site. However, in the scenario where a network uses different deployments for different sites, e.g., the different deployments of site 410 and site 440 of Fig. 4, there is a possibility that some neighbor cell measurements are missing. To provide an example with reference to Fig. 4, the UE may be currently in the macro cell coverage area 450 of the site 440. In this scenario, the serving cells for CC1 / CC2 / CC3 / CC4 / CC5 are all co-located and belong to the same co-location group, e.g., if the UE uses the RTD to determine co-location groups, the UE may determine that CC1-CC5 belong to the same co-location group. If the UE were configured to perform neighbor cell measurements for CC1 / CC2 / CC3 / CC4 / CC5 for macro cell coverage area 420 based on the deployment of site 440, the UE may improperly assume that CC4 and CC5 are also co-located with CC1 / CC2 / CC3 in site 410 and not perform a separate neighbor cell measurement for at least one of these non-co-located CCs.
[0046] To address this possible scenario, the example embodiments may include an additional operation where the network may indicate if the same deployment is to be assumed between the serving site (or base station) and the neighbor site (or base station) . In the example of Fig. 4, the network may indicate that site 440 and site 410 are different. This indication may be signaled to the UE via RRC, MAC-CE or DCI signaling or may also be included in a System Information Block (SIB) broadcast by the base station. When the indication is that the sites are different, the UE may not perform the neighbor cell co-location group measurements but may use a legacy measurement assumption, e.g., individual measurement of each neighbor CC.
[0047] In a second option, the network may configure the co-location groups for the UE or indicate the co-location information to UE for multiple CCs. For example, the network may signal which CCs are in the same co-location group to the UE, label the target to-be-measured CCs with different co-location group indexes, or indicate to the UE which CCs may share the same neighbor cell measurement. This signaling may include RRC signaling (e.g., in a measurement obj ect (MO) configuration) , MAC-CE signaling, or DCI signaling.
[0048] In a third option, the UE may use a contiguous status of CCs to determine the co-location group. For example, the UE may determine if the to-be-measured CCs are contiguous CCs in the same FR2 band to decide if the CCs are co-located (e.g., in the same co-location group) . In this option, this may be a deployment rule that is enforced by standards such that the UE and the network will have the same understanding with respect to contiguous CCs. Again, with reference to the macro cell coverage area 420 of Fig. 4, if the contiguous CC rule is enforced, the CC1 / CC2 / CC3 would be served on contiguous CCs of the FR2 band. Similarly, the CC4 and CC5 would be served on contiguous CCs of the same FR2 band but these CCs of CC4 and CC5 would not be contiguous with the CCs of CC1 / CC2 / CC3.
[0049] Fig. 5 shows an example method 500 for selecting non-co-located CCs for measurement based on co-location groups according to various example embodiments. The method 500 is described from the standpoint of the UE and may be performed based on the deployment scenario described with reference to Fig. 4.
[0050] In 510, the UE determines the co-location groups to which each of the neighbor CCs belong. As described above, example manners of determining the co-location groups may include using RTD among the neighbor CCs, contiguous / non-contiguous status of the neighbor CCs or may be based on signaling received from the network.
[0051] In 520, the UE may select the reference CC for each of the determined co-location groups, e.g., the CC of the co-location group for which the measurements may be performed. Some example rules for selecting the reference CC were described above, including rules for selecting the PCC, PSCC and / or SCCs.
[0052] In 530, the UE may perform the neighbor cell measurements for the reference CCs of each of the co-location groups. In 540, the UE may report the neighbor cell measurements for each of the reference CCs of each of the co-location groups. The network may use the neighbor cell measurements for each of the reference CCs as a proxy for the neighbor cell measurements of other CCs in the same co-location group.
[0053] The above example embodiments described the use of co-location groups to determine the reference CCs for non-co- located non-contiguous CCs in FR2 for neighbor cell measurements. The following example embodiments may similarly determine reference CCs but may not use the concept of the co-location groups as the above example embodiments.
[0054] In other example embodiments, the UE may use contiguous CCs as a basis for skipping measurements for some CCs, e.g., the UE does not need to check (or the network does not need to configure) co-location groups for the CCs. For example, the UE may measure neighbor cells on one CC (e.g., the reference CC) among the contiguous CCs in a FR2 band. For example, referring to Fig. 4, in the coverage area 450 of site 440, the CC1-CC5 may be deployed on contiguous CCs in a FR2 band. The UE may determine that since all five (5) CCs are on contiguous CCs of the same band, the UE may measure only one of the CCs (e.g., the reference CC) and determine the measurements for the reference CC apply to the remaining CCs.
[0055] Similar to the above example, the selection of the reference CC may be based on rules. A first example rule for selecting a reference CC in the contiguous CC scenario may be to select the PCC when the UE is configured with SA NR operation mode and the PCC is among the contiguous CCs in the band. A second example rule for selecting a reference CC in the contiguous CC scenario may be to select the PSCC when the UE is configured with EN-DC and the PSCC is among the contiguous CCs in the band. A third example rule for selecting a reference CC in the contiguous CC scenario may be to select the PSCC when the UE is configured with NR-DC and the PSCC is among the contiguous CCs in the band. A fourth example rule for selecting a reference CC in the contiguous CC scenario may be to select one of the SCCs among the contiguous CCs on which UE is configured to report SSB based measurements when neither the PCC nor the PSCC is in the same band. Based on this example rule, the selected SCC may be an SCC where the UE is configured with SS-RSRP measurement reporting if such an SCC exists, otherwise the selected SCC may be determined by UE implementation. For example, the UE may select the SCC by ranking SCC index, random selection, or based on serving CCs quality / strength.
[0056] In further example embodiments, the network may indicate the reference CC for the UE to measure the neighbor cell in each FR2 band. For example, when the UE camps on a serving cell, the network may indicate or configure the CCs for neighbor cell measurements and indicate these CCs within a FR2 band to be measured for neighbor cell measurements. For example, when the UE is configured to perform neighbor cell measurements for the CCs in the macro coverage area 420, the network may configure the UE to perform neighbor cell measurements for CC1 and CC4. When the network receives these measurements, the network will understand that the CC1 measurements may be used for CC2 and CC3 and the CC4 measurements may be used for CC5. The UE may be unaware of the co-location relationship between the CCs but the UE is not concerned with the co-location scenario because the UE is configured with the particular neighbor cell measurements the UE is to perform.
[0057] In these example embodiments, when the UE is in a mobility scenario and changes the PCell or performs a handover, in one option, the UE may re-acquire the information for measurement from the new serving cell. In another option, the UE may follow the previous configuration for neighbor cell measurement until the network indicates a new configuration to UE. In a further option, if the UE remains in a same tracking area (TA) , the UE may follow the same configuration for neighbor cell measurement, e.g., determine the deployment will not change in a single TA.
[0058] In additional example embodiments, the neighbor cell measurement behavior of the UE may be based on the type of neighbor cell measurements being performed. For example, neighbor cell measurements may include RSRP, Reference Signal Received Quality (RSRQ) , Received Signal Strength Indicator (RSSI) and Signal to interference plus noise ratio (SINR) . The UE measurement behavior may be based on the different measurement metrics.
[0059] For example, if the network configures the UE to perform RSRP / RSRQ / RSSI measurements on neighbor cells on different CCs, the UE may follow the legacy solution (e.g., measure each CC separately) . However, if the network configures the UE to perform SINR measurements on neighbor cells on different CCs, the UE may implement one of the above examples of limiting the number of neighbor cell measurements, e.g., based on co-location groups, contiguous CCs or network configuration.
[0060] In another example, if the network configures the UE to perform RSRP / RSRQ / RSSI measurements on neighbor cells on different CCs, the UE may implement one of the above examples of limiting the number of neighbor cell measurements, e.g., based on co-location groups, contiguous CCs or network configuration. If the network configures the UE with SINR measurements on neighbor cells on different CCs, the UE may perform the measurements on each CC configured for SINR measurements. In this example, the individual CC measurements may be used because the interference may be different among CCs due to the traffic load.
[0061] Thus, the example embodiments provide various manners for the UE to perform neighbor cell measurements for CCs of a CA combination where some of the CCs are not co-located, wherein the UE is not required to measure all the CCs of the CA combination, thereby saving UE power and network resources for reporting the neighbor cell measurements.
[0062] Examples
[0063] In a first example, a method comprising determining neighbor cell measurements for a set of intra-band carrier aggregation (CA) component carriers (CCs) are to be performed wherein at least one neighbor cell transmitting reference signals (RS) on a first CC to be measured is non-co-located with neighbor cells transmitting RSs on additional CCs to be measured, selecting CCs of the set of intra-band CA CCs for which neighbor cell measurements are performed and generating, for transmission to a network, measurement results comprising the neighbor cell measurements of the selected CCs.
[0064] In a second example, the method of the first example, wherein the intra-band CA CCs are transmitted in a frequency range 2 (FR2) .
[0065] In a third example, the method of the first example, wherein the first CC is non-contiguous with the additional CCs to be measured.
[0066] In a fourth example, the method of the first example, further comprising determining the additional CCs are members of a first co-location group and determining the first CC is a member of a second co-location group, wherein the selected CCs comprise at least one CC from the first co-location group and at least one CC from the second co-location group.
[0067] In a fifth example, the method of the fourth example, wherein the at least one CC from the first co-location group is selected based on being one of (i) a primary component carrier (PCC) when standalone (SA) New Radio (NR) operation mode is configured and the PCC is in the first co-location group, (ii) a primary secondary component carrier (PSCC) when E-UTRAN New Radio–Dual Connectivity (EN-DC) or NR-DC is configured and the PSCC is in the first co-location group, or (iii) a secondary component carrier (SCC) .
[0068] In a sixth example, the method of the fifth example, wherein, when the at least one CC from the first co-location group is the SCC and there are multiple SCCs in the first co-location group, the SCC is one of the multiple SCCs for which synchronization signal block (SSB) based measurements are configured when neither the PCC nor the PSCC is in the first co-location group.
[0069] In a seventh example, the method of the sixth example, wherein, when there is no SCC for which SSB based measurements are configured, the SCC is selected based on one of (i) an index of the SCCs, (ii) random selection, or (iii) a quality or strength of a serving cell corresponding to the SCC.
[0070] In an eighth example, the method of the fourth example, wherein the second co-location group further comprises further CCs transmitted by further neighbor cells that are co-located with the at least one neighbor cell.
[0071] In a ninth example, the method of the eighth example, wherein the at least one CC from the second co-location group is selected based on being one of (i) a primary component carrier (PCC) when standalone (SA) New Radio (NR) operation mode is configured and the PCC is in the second co-location group, (ii) a primary secondary component carrier (PSCC) when E-UTRAN New Radio–Dual Connectivity (EN-DC) or NR-DC is configured and the PSCC is in the second co-location group, or (iii) a secondary component carrier (SCC) .
[0072] In a tenth example, the method of the ninth example, wherein, when the at least one CC from the second co-location group is the SCC and there are multiple SCCs in the second co-location group, the SCC is one of the multiple SCCs for which synchronization signal block (SSB) based measurements are configured when neither the PCC nor the PSCC is in the second co-location group.
[0073] In an eleventh fourth example, the method of the tenth example, wherein, when there is no SCC for which SSB based measurements are configured, the SCC is selected based on one of (i) an index of the SCCs, (ii) random selection, or (iii) a quality or strength of a serving cell corresponding to the SCC.
[0074] In a twelfth example, the method of the fourth example, wherein determining the additional CCs are members of the first co-location group and the first CC is the member of the second co-location group is based on received timing differences (RTD) among serving CCs corresponding to the additional CCs and the first CC.
[0075] In a thirteenth example, the method of the twelfth example, wherein determining the additional CCs are members of the first co-location group based on the RTD between the serving CCs corresponding to the additional CCs are less than a predetermined threshold and the first CC is the member of the second co-location group is based on the RTD between the serving CCs of the additional CCs and the serving CC corresponding to the first CC is greater than the predetermined threshold.
[0076] In a fourteenth example, the method of the twelfth example, further comprising processing, based on signaling from the network, an indication that a first cell site configuration for the additional CCs and the first CC is the same as a second cell site configuration for the serving site for the serving CCs corresponding to the additional CCs and the first CC.
[0077] In a fifteenth example, the method of the fourth example, wherein determining the additional CCs are members of the first co-location group and the first CC is the member of the second co-location group is based on signaling received from the network
[0078] In a sixteenth example, the method of the fourth example, wherein determining the additional CCs are members of the first co-location group is based on the additional CCs being contiguous in frequency with each other and the first CC is the member of the second co-location group based on the first CC being non-contiguous in frequency with the additional CCs.
[0079] In a seventeenth example, the method of the fourth example, further comprising determining the additional CCs are contiguous in frequency with each other, wherein the selected CCs comprise at least one CC of the additional CCs and determining the first CC is non-contiguous in frequency with the additional CCs, wherein the selected CCs comprise the first CC.
[0080] In an eighteenth example, the method of the seventeenth example, wherein the at least one CC of the additional CCs is selected based on being one of (i) a primary component carrier (PCC) when standalone (SA) New Radio (NR) operation mode is configured and the PCC is one of the contiguous in frequency additional CCs, (ii) a primary secondary component carrier (PSCC) when E-UTRAN New Radio–Dual Connectivity (EN-DC) or NR-DC is configured and the PSCC is one of the contiguous in frequency additional CCs, or (iii) a secondary component carrier (SCC) .
[0081] In a nineteenth example, the method of the eighteenth example, wherein, when the at least one CC from the contiguous in frequency additional CCs is the SCC and there are multiple SCCs in the contiguous in frequency additional CCs, the SCC is one of the multiple SCCs for which synchronization signal block (SSB) based measurements are configured when neither the PCC nor the PSCC is in the first co-location group.
[0082] In a twentieth example, the method of the nineteenth example, wherein, when there is no SCC for which SSB based measurements are configured, the SCC is selected based on one of (i) an index of the SCCs, (ii) random selection, or (iii) a quality or strength of a serving cell corresponding to the SCC.
[0083] In a twenty first example, the method of the first example, further comprising processing, based on signals from the network, an indication of the selected CCs.
[0084] In a twenty second example, the method of the twenty first example, wherein a mobility event occurs comprising serving cells the serving CCs are switched.
[0085] In a twenty third example, the method of the twenty second example, further comprising processing, based on signals from the network, a second indication of the selected CCs based on the mobility event.
[0086] In a twenty fourth example, the method of the twenty second example, wherein, in response to the mobility event, the selected CCs remain the same until new signaling is received from the network.
[0087] In a twenty fifth example, the method of the twenty second example, wherein, in response to the mobility event, the selected CCs remain the same when the serving cells are in a same tracking area (TA) as previous serving cells.
[0088] In a twenty sixth example, the method of the first example, wherein the selected CCs are based on a type of neighbor cell measurement to be performed.
[0089] In a twenty seventh example, the method of the twenty sixth example, wherein the type of neighbor cell measurement comprises one of Reference Signal Received Power (RSRP) measurements, Reference Signal Received Quality (RSRQ) measurements, Received Signal Strength Indicator (RSSI) measurements or Signal to interference plus noise ratio (SINR) measurements.
[0090] In a twenty eighth example, the method of the twenty seventh example, wherein a first set of selected CCs are selected when the type of measurement of neighbor cell measurements comprises RSRP measurements, RSRQ measurements or RSSI measurements and second set of selected CCs are selected when the type of measurement of neighbor cell measurements comprises SINR measurements.
[0091] In a twenty ninth example, a processor configured to perform any of the first through twenty eighth examples.
[0092] In a thirtieth example, a user equipment (UE) comprising a transceiver configured to communicate with a network and a processor communicatively coupled to the transceiver and configured to perform any of the first through twenty eighth examples.
[0093] Those skilled in the art will understand that the above-described example embodiments may be implemented in any suitable software or hardware configuration or combination thereof. An example hardware platform for implementing the example embodiments may include, for example, an Intel x86 based platform with compatible operating system, a Windows OS, a Mac platform and MAC OS, a mobile device having an operating system such as iOS, Android, etc. The example embodiments of the above described method may be embodied as a program containing lines of code stored on a non-transitory computer readable storage medium that, when compiled, may be executed on a processor or microprocessor.
[0094] Although this application described various embodiments each having different features in various combinations, those skilled in the art will understand that any of the features of one embodiment may be combined with the features of the other embodiments in any manner not specifically disclaimed or which is not functionally or logically inconsistent with the operation of the device or the stated functions of the disclosed embodiments.
[0095] It is well understood that the use of personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users. In particular, personally identifiable information data should be managed and handled so as to minimize risks of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to users.
[0096] It will be apparent to those skilled in the art that various modifications may be made in the present disclosure, without departing from the spirit or the scope of the disclosure. Thus, it is intended that the present disclosure cover modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalent.
Claims
1.An apparatus comprising processing circuitry configured to:determine neighbor cell measurements for a set of intra-band carrier aggregation (CA) component carriers (CCs) are to be performed wherein at least one neighbor cell transmitting reference signals (RS) on a first CC to be measured is non-co-located with neighbor cells transmitting RSs on additional CCs to be measured;select CCs of the set of intra-band CA CCs for which neighbor cell measurements are performed; andgenerate, for transmission to a network, measurement results comprising the neighbor cell measurements of the selected CCs.2.The apparatus of claim 1, wherein the intra-band CA CCs are transmitted in a frequency range 2 (FR2) .3.The apparatus of claim 1, wherein the first CC is non-contiguous with the additional CCs to be measured.4.The apparatus of claim 1, wherein the processing circuitry is further configured to:determine the additional CCs are members of a first co-location group; anddetermine the first CC is a member of a second co-location group,wherein the selected CCs comprise at least one CC from the first co-location group and at least one CC from the second co-location group.5.The apparatus of claim 4, wherein the at least one CC from the first co-location group is selected based on being one of (i) a primary component carrier (PCC) when standalone (SA) New Radio (NR) operation mode is configured and the PCC is in the first co-location group, (ii) a primary secondary component carrier (PSCC) when E-UTRAN New Radio–Dual Connectivity (EN-DC) or NR-DC is configured and the PSCC is in the first co-location group, or (iii) a secondary component carrier (SCC) .6.The apparatus of claim 5, wherein, when the at least one CC from the first co-location group is the SCC and there are multiple SCCs in the first co-location group, the SCC is one of the multiple SCCs for which synchronization signal block (SSB) based measurements are configured when neither the PCC nor the PSCC is in the first co-location group.7.The apparatus of claim 4, wherein the second co-location group further comprises further CCs transmitted by further neighbor cells that are co-located with the at least one neighbor cell.8.The apparatus of claim 7, wherein the at least one CC from the second co-location group is selected based on being one of (i) a primary component carrier (PCC) when standalone (SA) New Radio (NR) operation mode is configured and the PCC is in the second co-location group, (ii) a primary secondary component carrier (PSCC) when E-UTRAN New Radio–Dual Connectivity (EN-DC) or NR-DC is configured and the PSCC is in the second co-location group, or (iii) a secondary component carrier (SCC) .9.The apparatus of claim 8, wherein, when the at least one CC from the second co-location group is the SCC and there are multiple SCCs in the second co-location group, the SCC is one of the multiple SCCs for which synchronization signal block (SSB) based measurements are configured when neither the PCC nor the PSCC is in the second co-location group.10.The apparatus of claim 4, wherein the processing circuitry determines the additional CCs are members of the first co-location group and the first CC is the member of the second co-location group based on received timing differences (RTD) among serving CCs corresponding to the additional CCs and the first CC.11.The apparatus of claim 10, wherein the processing circuitry determines the additional CCs are members of the first co-location group based on the RTD between the serving CCs corresponding to the additional CCs are less than a predetermined threshold and the first CC is the member of the second co-location group based on the RTD between the serving CCs of the additional CCs and the serving CC corresponding to the first CC is greater than the predetermined threshold.12.The apparatus of claim 10, wherein the processing circuitry is further configured to:process, based on signaling from the network, an indication that a first cell site configuration for the additional CCs and the first CC is the same as a second cell site configuration for the serving site for the serving CCs corresponding to the additional CCs and the first CC.13.The apparatus of claim 4, wherein the processing circuitry determines the additional CCs are members of the first co-location group and the first CC is the member of the second co-location group based on signaling received from the network.14.The apparatus of claim 4, wherein the processing circuitry determines the additional CCs are members of the first co-location group based on the additional CCs being contiguous in frequency with each other and the first CC is the member of the second co-location group based on the first CC being non-contiguous in frequency with the additional CCs.15.The apparatus of claim 1, wherein the processing circuitry is further configured to:determine the additional CCs are contiguous in frequency with each other, wherein the selected CCs comprise at least one CC of the additional CCs; anddetermine the first CC is non-contiguous in frequency with the additional CCs, wherein the selected CCs comprise the first CC.16.The apparatus of claim 15, wherein the at least one CC of the additional CCs is selected based on being one of (i) a primary component carrier (PCC) when standalone (SA) New Radio (NR) operation mode is configured and the PCC is one of the contiguous in frequency additional CCs, (ii) a primary secondary component carrier (PSCC) when E-UTRAN New Radio–Dual Connectivity (EN-DC) or NR-DC is configured and the PSCC is one of the contiguous in frequency additional CCs, or (iii) a secondary component carrier (SCC) .17.The apparatus of claim 16, wherein, when the at least one CC from the contiguous in frequency additional CCs is the SCC and there are multiple SCCs in the contiguous in frequency additional CCs, the SCC is one of the multiple SCCs for which synchronization signal block (SSB) based measurements are configured when neither the PCC nor the PSCC is in the first co-location group.18.The apparatus of claim 1, wherein the processing circuitry is further configured to:process, based on signals from the network, an indication of the selected CCs.19.The apparatus of claim 18, wherein a mobility event occurs comprising serving cells the serving CCs are switched.20.The apparatus of claim 19, wherein the processing circuitry is further configured to:process, based on signals from the network, a second indication of the selected CCs based on the mobility event.21.The apparatus of claim 1, wherein a first set of selected CCs are selected when the type of measurement of neighbor cell measurements comprises RSRP measurements, RSRQ measurements or RSSI measurements and second set of selected CCs are selected when the type of measurement of neighbor cell measurements comprises SINR measurements.
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