The present disclosure relates generally to mobile communication networks. In particular, the disclosure relates to coordinated allocation of radio resources between terrestrial and non-terrestrial networks (TN; NTN).
Coverage extension and capacity enhancement are two primary challenges in the field of mobile networks. It has been observed that there exists a complementary demand for both terrestrial network (TN) spectrum and non-terrestrial network (NTN) spectrum across different geographic locations. On one hand, in densely populated areas, there is a significant need for TN spectrum, while NTN spectrum remains underutilized. On the other hand, in remote areas, there is no TN coverage, resulting in unused TN spectrum, and a severe shortage of NTN spectrum.
In order to address this complementary demand, it is desirable to leverage the currently unused spectrum to augment system capacity and spectral efficiency, so as to provide global service for multimode devices through coordination between TN and NTN.
Aspects of the disclosure provide a method for performing radio resource allocation in a terrestrial network (TN) and non-terrestrial network (NTN) mixed system. The mixed system includes a satellite that covers at least one NTN cell, and a plurality of TN base stations (TN BSs) within a coverage of the satellite. The NTN cell serves a plurality of NTN user equipments (NTN UEs). Each of the plurality of TN BSs serves a plurality of TN user equipments (TN UEs). The method includes: dividing the plurality of NTN UEs into X NTN UE groups; partitioning a radio resource into M parts, where M≥X; dividing the plurality of TN BSs into M TN BS groups; deciding radio resource allocation regarding the plurality of NTN UEs, by allocating an i-th part of the radio resource to an i-th NTN UE group, where i=1, 2, . . . , X; and deciding radio resource allocation regarding the plurality of TN BSs, by allocating a sum of a j-th to an M-th parts of the radio resource to a j-th TN BS group, where j=1, 2, . . . , M.
Aspects of the disclosure provide an apparatus for performing radio resource allocation in a terrestrial network (TN) and non-terrestrial network (NTN) mixed system. The mixed system includes a satellite that covers at least one NTN cell, and a plurality of TN base stations (TN BSs) within a coverage of the satellite. The NTN cell serves a plurality of NTN user equipments (NTN UEs). Each of the plurality of TN BSs serves a plurality of TN user equipments (TN UEs). The apparatus includes circuitry configured to: divide the plurality of NTN UEs into X NTN UE groups; partition a radio resource into M parts, where M≥X; divide the plurality of TN BSs into M TN BS groups; decide radio resource allocation regarding the plurality of NTN UEs, by allocating an i-th part of the radio resource to an i-th NTN UE group, where i=1, 2, . . . , X; and decide radio resource allocation regarding the plurality of TN BSs, by allocating a sum of a j-th to an M-th parts of the radio resource to a j-th TN BS group, where j=1, 2, . . . , M.
Aspects of the disclosure also provide a non-transitory computer-readable medium storing instructions. The instructions, when executed by a processor, can cause the processor to perform the above method for performing radio resource allocation in a TN-NTN mixed system.
Note that this summary section does not specify every embodiment and/or incrementally novel aspect of the present disclosure or claimed invention. Instead, the summary only provides a preliminary discussion of different embodiments and corresponding points of novelty. For additional details and/or possible perspectives of the invention and embodiments, the reader is directed to the Detailed Description section and corresponding figures of the present disclosure as further discussed below.
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:
The following disclosure provides many different embodiments, or examples, for implementing different features of the provided subject matter. Specific examples of components and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting.
For example, the order of discussion of the different steps as described herein has been presented for the sake of clarity. In general, these steps can be performed in any suitable order. Additionally, although each of the different features, techniques, and configurations, etc., herein may be discussed in different places of this disclosure, it is intended that each of the concepts can be executed independently of each other or in combination with each other. Accordingly, the present disclosure can be embodied and viewed in many different ways.
Furthermore, as used herein, the words “a,” “an,” and the like generally carry a meaning of “one or more,” unless stated otherwise.
As can be seen from
By analyzing the Reference Signals Received Power (RSRP) (or the Reference Signals Received Quality (RSRQ)) in the NTN beam (or the NTN cell), the coverage of the NTN beam can be determined. This determination can be based on comparing the received RSRP or RSRQ at the satellite from the NTN UE in question (or at the NTN UE in question from the satellite) against a predefined threshold. If the measured values exceed this threshold, it indicates that the NTN UE is within the coverage of the NTN beam.
In accordance with embodiments of this disclosure, coordination is established between TN and NTN radio resources to optimize spectrum allocation, enhance coverage, and improve overall network performance. The radio resources assigned for the TN cells can partially overlap with the radio resources assigned for the NTN cells. This partial overlap between the radio resources can involve the frequency domain, the time domain, and/or the polarization direction, enabling efficient utilization and allocation of resources within the coordinated TN-NTN framework.
According to one embodiment of the disclosure, based on a set of predefined threshold(s) {δ1NTN, δ2NTN, . . . , δM-2NTN}, the NTN UEs can be divided into (M-1) groups, i.e., {N1, N2, . . . , NM-1}. The radio resources can be partitioned into M parts, W1, W2, . . . , WM. Each of the (M-1) parts of the radio resources can be assigned to a specific group of the NTN UEs.
For example, as shown in
For example, the i-th part Wi of the radio resources can be determined by
W
i=(W−WM)*|Ni|/(sum(|N1|, |N2|, . . . , |NM-1)),
where |Ni| denotes the number of the NTN UEs included in the i-th NTN UE group Ni, and i=1, 2, . . . , M-1. Furthermore, each NTN UE in the group Ni receives a portion of Wi, denoted as bwi, which is determined by
bw
i
=W
i
/|N
i|.
Similarly, based on a set of predefined thresholds {δ1TN, δ2TN, . . . , δM-1TN}), the TN BSs can be divided into M groups, i.e., {T1, T2, . . . , TM}. The sum of radio resources (Wk, Wk+1, . . . , WM) can be assigned to the k-th TN BS group Tk, where 1≤k≤M.
Note that it is possible for some of the (M−1) NTN UE groups to be empty. For example, when M=4, the NTN UEs are divided into three groups: N1, N2, and N3. In this scenario, it is possible that only the groups N1 and N2 contain NTN UEs, while the group N3 does not have any NTN UEs. Similarly, some of the M TN BS groups can also be empty. For example, it is possible that only the groups T1, T2, and T4 have TN BSs, while the group T3 does not have any TN BSs.
In the above-described embodiment, the NTN UEs and TN BSs are grouped based on two sets of predefined thresholds. However, in another embodiment of the disclosure, grouping can be accomplished using an objective function.
Specifically, the maximum number (i.e., M) of the radio resource groups and the unit resources (i.e., {bw1, bw2, bwM-1}) for each of the radio resource groups W1, W2, . . . , WM-1 can be pre-determined, and an objective function can be pre-defined.
To maximize the objective function, two sets of threshold parameters can be determined. The first set of threshold parameters {δ1NTN, δ2NTN, . . . , δM-2NTN} is used for grouping the NTN UEs, while the second set of threshold parameters {δ1TN, δ2TN, . . . , δM-1TN} is used for grouping the TN BSs.
Using the first set of threshold parameters {δ1NTN, δ2NTN, . . . , δM-2NTN}, the NTN UEs can be divided into (M-1) groups, i.e., {N1, N2, . . . , NM-1}. Similarly, using the second set of threshold parameters {δ1TN, δ2TN, . . . , δM-1TN}, the TN BSs can be grouped into M groups, i.e., {T1, T2, . . . , TM}.
As mentioned previously, it is possible for some of the (M-1) NTN UE groups to be empty. Similarly, some of the M TN BS groups can also be empty.
Based on the number of NTN UEs in each NTN UE group and the unit resource for each radio resource group, the total radio resources W can be partitioned into M parts, {W1, W2, . . . , WM}, where Wi=|Ni|*bwi, for i=1, 2, . . . , M-1, and WM=W−sum(W1, W2, . . . WM-1).
The k-th part Wk of the radio resources can be assigned to the k-th NTN UE group Nk, where 1≤k≤M-1. For i=1, 2, . . . , M-1, each NTN UE in the i-th group Ni is allocated a portion of the radio resource, which has a size equal to bw i . The sum of radio resources (Wk, Wk+1, . . . , WM) can be assigned to the k-th TN BS group Tk, where 1≤k≤M.
Note that although in the above examples, NTN UEs are divided into (M-1) groups, other numbers of NTN UE groups are possible. For instance, M, (M-2), or (M-3) NTN UE groups can be used without departing from the spirit and scope of this disclosure.
The objective function can be formulated in various ways. Here, four non-limiting examples of the objective function are provided. Those skilled in the art can recognize that other forms of the objective function are also possible.
Example 1: (sum of TN BSs' throughput in group T1, T2, . . . , TM)*(sum of NTN UEs' throughput in group N1, N2, . . . , NM-1).
Example 2: (1−α)*(sum of TN BSs' throughput in group T1, T2, . . . , TM)+α*(sum of NTN UEs' throughput in group N1, N2, . . . , NM−1), where α∈(0,1) is a weighted factor.
Example 3: (sum of TN BSs' obtained bandwidth in group T1, T2, . . . , TM)*(sum of NTN UEs' throughput in group N1, N2, . . . , NM-1).
Example 4: (1-a)*(sum of TN BSs' obtained bandwidth in group T1, T2, . . . , TM)+α*(sum of NTN UEs' throughput in group N1, N2, . . . , NM-1), where α∈(0,1) is a weighted factor.
The RS Configuration Information Sending Module 510 sends reference signal (RS) configuration information to the satellite and the TN BSs. The RS configuration information defines how a reference signal that is to be used for acquiring the information necessary to allocate radio resources is transmitted. For example, the RS configuration information specifies the resource blocks on which the reference signal should be transmitted.
The required information acquiring module 520 acquires, from the satellite, the TN BSs, and/or the NTN UEs, information that is required to make radio resource allocation decisions. Two examples illustrating the specifics of this acquired information will be described below.
Based on the information acquired by the required information acquiring module 520, the radio resource allocating module 530 determines the optimal allocation of radio resources between the TN BS groups and the NTN UE groups. Consequently, the radio resource allocating module 530 generates resource allocation results. The radio resource allocating module 530 can include three sub-modules: an NTN UE grouping module 532, a resource partitioning module 534, and a TN BS grouping module 536. These sub-modules can handle NTN UE grouping, radio resource partitioning, and TN BS grouping, respectively.
The resource allocation result transmitting module 540 receives the resource allocation results generated by the radio resource allocation module 530, and transmits them to the satellite and the TN BSs.
For instance, the resource allocation results can be transmitted via unicast communication. In cases where the radio resources are partitioned in the frequency domain, the allocated frequency ranges and their corresponding valid duration can be transmitted to the respective TN BSs and the satellite.
Upon receiving the resource allocation results, the TN BSs and the satellite can configure or de-configure cells based on the received information. Additionally, they can broadcast cell information and deconfiguration details to the UEs within the cells. This ensures that the UEs are informed of the cell configuration changes.
Once the UEs receive the cell configuration or deconfiguration information, they can acknowledge its receipt by returning an acknowledgement message. Then, the UEs can access or leave the cell as required, aligning their behavior with the updated configuration.
In
For instance, a server can be responsible for collecting the information necessary to determine radio resource allocation, while a controller can decide resource allocation based on the information collected by the server. Note that this is merely a non-restrictive example, as those skilled in the art can recognize that there are various alternative approaches to accomplish the radio resource allocation.
In step S620, the required information for performing the radio resource allocation is acquired from the satellite, NTN UEs, and/or TN BSs.
In step S630, using the set of thresholds {δ1NTN, δ2NTN, . . . , δM2NTN}, the NTN UEs are divided into different groups based on the acquired information. As described above, the set of thresholds can be predefined for the TN-NTN framework, or determined using an objective function.
In step S640, the radio resources can be partitioned. In step S650, using the set of thresholds {δ1TN, δ2TN, . . . , δM-1TN}, the TN BSs can be grouped. In step S660, the radio resources can be allocated for the NTN UE groups and the TN BS groups in a manner described with reference to
In the following two examples, further details of the radio resource allocation process are provided.
As described with reference to
The required information can include: (i) information that facilitates to determine the NTN UE groups, and (ii) information that facilitates to determine the TN BS groups.
For instance, the information that facilitates to determine the NTN UE groups can include: (a) the received RSRP at the satellite from each NTN UE in the NTN beam, and (b) the received RSRP at each NTN UE from the satellite in the NTN beam, etc.
The information that facilitates to determine the TN BS groups can include: (a) a coupling loss, which can be defined as the path loss minus the transmitter's and the receiver's antenna gain, of each TN BS to the satellite, where the coupling loss can be inferred from a satellite reference signal received at the TN BS; (b) the coupling loss of each TN BS to the satellite, where the coupling loss can be inferred from a TN BS reference signal received at the satellite; (c) the coupling loss of each TN BS to the NTN UEs, where the coupling loss can be inferred from the NTN UEs' reference signal received at the TN BS; (d) the coupling loss of each TN BS to the NTN UEs, where the coupling loss can be inferred from the TN BS's reference signal received at the NTN UEs, for example.
As described with reference to
(A) Procedure 2-1: Dividing the NTN UEs in Each NTN Beam into (M-1) NTN UE Groups
According to one embodiment, the NTN UEs can be classified into M-1 groups, based on the received RSRP at the satellite. For example, the satellite can measure the received power of a UL signal (e.g., Sounding reference signal (SRS), preamble, Physical Uplink Control Channel (PUCCH), Physical Uplink Shared Channel (PUSCH), etc.) from the NTN UEs in the beam. Then, the NTN UE groups can be determined based on the individual received UL signal power and the predefined threshold set (e.g., {δ1NTN, δ2NTN, . . . , δM-2NTN}) .
For instance, with M=4, three NTN UE groups can be obtained, where N1={NTN UE id|the received NTN UL signal power≤∂1NTN}, N2={NTN UE id|δ1NTN<the received NTN UL signal power≤δ2NTN}, and N3={NTN UE id|δ2NTN<the received NTN UL signal power}.
According to an alternative embodiment, the NTN UEs can be classified into M-1 groups, based on the received RSRP at the NTN UEs. For example, the NTN UEs in the beam measures the received power of a DL signal (e.g., Synchronization Signal Block (SSB), Reference signal (RS), Channel State Information Reference Signal (CSI-RS), Tracking reference signaling (TRS), Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channel (PDSCH), etc.) from the satellite. Then, the NTN UE groups can be determined based on the individual received DL signal power and the predefined threshold set (e.g., {δ1NTN, δ2NTN, . . . , δM-2NTN}).
For instance, with M=4, three NTN UE groups can be obtained, where N1={NTN UE id| the received NTN DL signal power≤δ1NTN}, N2={NTN UE id|δ1NTN<the received NTN DL signal power≤δ2NTN}, and N3={NTN UE id|δ2NTN<the received NTN DL signal power}.
(B) Procedure 2-2: Partitioning the Radio Resources into M Non-Overlapping Radio Resource Parts
Partitioning of the radio resources can be performed across various domains, including but not limited to the frequency domain, the time domain, and the polarization direction.
For example, in the frequency domain, the radio resources W can be partitioned according to the number of NTN UEs in each NTN UE group. For a part Wi with i=1, 2, . . . M-1, Wi=(W−WM)*|Ni|/(sum(|N1|, |N2|, . . . , |NM-1|)), where the part WM is exclusively reserved for TN BS usage.
As another example, the radio resources W can be partitioned in the time domain, according to the number of NTN UEs in each NTN UE group. For a part Wi with i=1, 2, . . . M-1, Wi=(W−WM)*|Ni|/(sum(|Ni|, |N2|, . . . , |NM-1|)), where WM is the part exclusively allocated for TN BS usage.
(C) Procedure 2-3: Grouping TN BS(s) in the Satellite'S Coverage into M TN BS Groups
According to one embodiment, the TN BSs can be classified into M groups, based on the coupling loss from each TN BS to the NTN beam of the satellite. For example, the coupling loss of each TN BS to the NTN beam of the satellite can be inferred from the satellite reference signal received at the TN BS, or the TN BS reference signal received at the satellite. Then, the TN BS groups can be determined based on the individual coupling loss from the TN BSs to the NTN beam of the satellite and the predefined threshold set (e.g., {δ1TN, δ2TN, . . . , δM−1TN}).
For instance, with M=4, four TN BS groups can be obtained, where T1={TN BS id|the coupling loss from the TN BS to the NTN beam of the satellite≤δ1TN}, T2={TN BS id|δ1TN<the coupling loss from the TN BS to the NTN beam of the satellite≤δ2TN},T3={TN BS id|δ2TN<the coupling loss from the TN BS to the NTN beam of the satellite≤δ3TN}, and T4={TN BS id|δ3TN<the coupling loss from the TN BS to the NTN beam of the satellite}.
According to an alternative embodiment, the TN BSs can be classified into M groups, based on the coupling loss from each TN BS to the NTN UEs in the beam. For example, the coupling loss of each TN BS to an NTN UE can be inferred from the NTN UEs' reference signal received at the TN BS, or the TN BS's reference signal received at the NTN UEs, etc. Then, the TN BS groups can be determined based on the individual coupling loss from the TN BS to the NTN UEs in the beam and the predefined threshold set (e.g., {δ1TN, δ2TN, . . . , δM-1TN}).
For instance, with M=4, four TN BS groups can be obtained, where T1={TN BS id|the coupling loss from the TN BS to a selected one of the NTN UEs in the beam≤δ1TN}, T2={TN BS id|δ1TN<the coupling loss from the TN BS to the selected NTN UE in the beam≤δ2TN}, T3={TN BS id|δ2TN<the coupling loss from the TN BS to the selected NTN UE in the beam≤δ3TN}, and T4={TN BS id|δ3TN<the coupling loss from the TN BS to the selected NTN UE in the beam}. The selection of the NTN UE can be based on various predefined criteria.
In another example with M=4, T1={TN BS id|the average coupling loss from the TN BS to the NTN UEs in the beam≤δ1TN}, T2={TN BS id|δ1TN<the average coupling loss from the TN BS to the NTN UEs in the beam≤δ2TN}, T3={TN BS id|δ2TN<the average coupling loss from the TN BS to the NTN UEs in the beam≤δ3TN}, and T4={TN BS id|δ3TN<the average coupling loss from the TN BS to the NTN UEs in the beam}.
In another example with M=4, T1={TN BS id|the maximum coupling loss from the TN BS to the NTN UEs in the beam≤δ1TN}, T2={TN BS id|δ1TN<the maximum coupling loss from the TN BS to the NTN UEs in the beam≤δ2TN}, T3={TN BS id|δ2TN<the maximum coupling loss from the TN BS to the NTN UEs in the beam≤δ1TN}, and T4={TN BS id|δ3TN<the maximum coupling loss from the TN BS to the NTN UEs in the beam}.
In another example with M=4, T1={TN BS id|the median coupling loss from the TN BS to the NTN UEs in the beam≤δ1TN}, T2={TN BS id|δ1TN<the median coupling loss from the TN BS to the NTN UEs in the beam≤δ2TN}, T3={TN BS id|δ2TN<the median coupling loss from the TN BS to the NTN UEs in the beam≤δ3TN}, and T4={TN BS id|δ3TN<the median coupling loss from the TN BS to the NTN UEs in the beam}.
In this procedure, the k-th radio resource part can be allocated to the corresponding k-th NTN UE group. Specifically, the ratio resource part Wi is assigned to the NTN UE group Ni, where i=1, 2, . . . , M-1. The radio resource assigned to each NTN UE in the group Ni is determined by bwi=Wi/|Ni|.
Additionally, the sum of the radio resource parts from Wk to WM is assigned to the k-th TN BS group. In other words, the resource parts, Wk+Wk+1+ . . . +WM, are assigned to the k-th TN BS group, where 1≤k≤M.
For example, the information regarding bwi, and Wi for each NTN UE within the NTN UE group Ni can be sent to the satellite, where i=1, 2, . . . , M-1. Similarly, the information regarding Wi, Wi+1, . . . , WM can be sent to each TN BS within the TN BS group Ti, where i=1, 2, . . . , M.
In this example, the process for allocating radio resources between TN BSs and NTN UEs mainly includes procedures 1-3 as well. Since Procedures 1 and 3 are the same as those described in Example 1, the description of these procedures is omitted.
In this procedure, two sets of threshold parameters are determined to maximize the objective function. The first set of threshold parameters {δ1NTN, δ2NTN, . . . , δM-2NTN} is used for grouping the NTN UEs, while the second set of threshold parameters {δ1TN, δ2TN, . . . , δM-1TN} is used for grouping the TN BSs.
For example, the objective function can be designed as (sum of TN BSs' obtained bandwidth in group T1, . . . TM)*(sum of NTN UEs' throughput in group N1, . . . NM-1), which can be given by:
where ΓkN
Other examples of the objective function can include but not limited to:
According to one embodiment, the NTN UEs can be classified into M−1 groups, based on the received RSRP at the satellite. For example, the satellite can measure the received power of a UL signal (e.g., SRS, preamble, PUCCH, PUSCH, etc.) from the NTN UEs in the beam. Then, the NTN UE groups can be determined based on the individual received UL signal power and the threshold parameter set (e.g., {δ1NTN, δ2NTN, . . . , δM-2NTN}) obtained in Procedure 2-1.
For instance, with M=4, three NTN UE groups can be obtained, where N1={NTN UE id|the received NTN UL signal power≤δ1NTN}, N2={NTN UE id|δ1NTN<the received NTN UL signal power≤δ2NTN}, and N3={NTN UE id|δ2NTN<the received NTN UL signal power}.
According to an alternative embodiment, the NTN UEs can be classified into M-1 groups, based on the received RSRP at the NTN UEs. For example, the NTN UE in the beam measures the received power of a DL signal (e.g., SSB, RS, CSI-RS, TRS, PDCCH, PDSCH, etc.) from the satellite. Then, the NTN UE groups can be determined based on the individual received DL signal power and the threshold parameter set (e.g., {δ1NTN, δ2NTN, . . . , δM-2NTN}) obtained in Procedure 2-1.
For instance, with M=4, three NTN UE groups can be obtained, where N1={NTN UE id|the received NTN DL signal power≤δ1NTN}, N2={NTN UE id|δ1NTN<the received NTN DL signal power≤δ2NTN}, and N3={NTN UE id|δ2NTN<the received NTN DL signal power}.
Procedure 2-3: Partitioning the Radio Resources into M Non-Overlapping Radio Resource Parts
Partitioning of the radio resources can be performed across various domains, including but not limited to the frequency domain, the time domain, and the polarization direction.
For example, in the frequency domain, the radio resources W can be partitioned according to the number of NTN UEs in each NTN UE group. For a part Wi with i=1, 2, . . . M-1, Wi=|Ni|*bwi; or Wi=(W−WM)*|Ni|/(sum(|N1|, |N2|, . . . , |NM-1|)).
As another example, the radio resources W can be partitioned in the time domain, according to the number of NTN UEs in each NTN UE group. For a part Wi with i=1, 2, . . . M-1, Wi=|Ni|*bwi; or Wi=(W−WM)*|Ni|/(sum(|N1|, |N2|, |NM-1|)).
In both examples above, the part WM is exclusively reserved for TN BS usage. For instance, the part WM can be predetermined, or determined by WM=the total radio resources−sum(W1+. . . +WM-1).
(D) Procedure 2-4: Grouping TN BSs in the Satellite's Coverage into M TN BS Groups
According to one embodiment, the TN BSs can be classified into M groups, based on the coupling loss from each TN BS to the NTN beam of the satellite. For example, the coupling loss of each TN BS to the NTN beam of the satellite can be inferred from the satellite reference signal received at the TN BS, or the TN BS reference signal received at the satellite. Then, the TN BS groups can be determined based on the individual coupling loss from the TN BSs to the NTN beam of the satellite and the threshold parameter set (e.g., {δ1TN, δ2TN, . . . , δM-1TN}). obtained in Procedure 2-1.
For instance, with M=4, four TN BS groups can be obtained, where T1={TN BS id|the coupling loss from the TN BS to the NTN beam of the satellite≤δ1TN}, T2={TN BS id|δ1TN<the coupling loss from the TN BS to the NTN beam of the satellite≤δ2TN}, T3={TN BS id|δ2TN<the coupling loss from the TN BS to the NTN beam of the satellite≤δ3TN}, and T4={TN BS id|δ3TN<the coupling loss from the TN BS to the NTN beam of the satellite}.
According to an alternative embodiment, the TN BSs can be classified into M groups, based on the coupling loss from each TN BS to the NTN UEs in the beam. For example, the coupling loss of each TN BS to an NTN UE can be inferred from the NTN UEs' reference signal received at the TN BS, or the TN BS's reference signal received at the NTN UEs, etc. Then, the TN BS groups can be determined based on the individual coupling loss from the TN BS to the NTN UEs in the beam and the threshold parameter set (e.g., {δ1TN, δ2TN, . . . , δM-1TN}) obtained in Procedure 2-1.
For instance, with M=4, four TN BS groups can be obtained, where T1={TN BS id|the coupling loss from the TN BS to a selected one of the NTN UEs in the beam≤δ1TN}, T2={TN BS id|δ1TN<the coupling loss from the TN BS to the selected NTN UE in the beam≤δ2TN}, T3={TN BS id|δ2TN<the coupling loss from the TN BS to the selected NTN UE in the beam≤δ3TN}, and T4={TN BS id|δ3TN<the coupling loss from the TN BS to the selected NTN UE in the beam}. One skilled in the art can recognize that various predefined criteria can be applied to select the NTN UE.
In another example with M=4, T1={TN BS id|the average coupling loss from the TN BS to the NTN UEs in the beam≤δ1TN}, T2={TN BS id|δ1TN<the average coupling loss from the TN BS to the NTN UEs in the beam≤δ2TN}, T3={TN BS id|δ2TN<the average coupling loss from the TN BS to the NTN UEs in the beam≤δ3TN}, and T4={TN BS id|δ3TN<the average coupling loss from the TN BS to the NTN UEs in the beam}.
In another example with M=4, T1={TN BS id|the maximum coupling loss from the TN BS to the NTN UEs in the beam≤δ1TN}, T2={TN BS id|δ1TN<the maximum coupling loss from the TN BS to the NTN UEs in the beam≤δ2TN}, T3={TN BS id|δ2TN<the maximum coupling loss from the TN BS to the NTN UEs in the beam≤δ3TN}, and T4={TN BS id|δ3TN<the maximum coupling loss from the TN BS to the NTN UEs in the beam}.
In another example with M=4, T1={TN BS id|the median coupling loss from the TN BS to the NTN UEs in the beam≤δ1TN}, T2={TN BS id|δ1TN<the median coupling loss from the TN BS to the NTN UEs in the beam≤δ2TN}, T3={TN BS id|δ2TN<the median coupling loss from the TN BS to the NTN UEs in the beam≤δ3TN}, and T4={TN BS id|δ3TN<the median coupling loss from the TN BS to the NTN UEs in the beam}.
In this procedure, the k-th radio resource part can be allocated to the corresponding k-th NTN UE group. Specifically, the ratio resource part Wi is assigned to the NTN UE group Ni, where i=1, 2, . . . , M-1. The radio resource assigned to each NTN UE in the group Ni is determined by bwi=Wi/|Ni|.
Additionally, the sum of the radio resource parts from Wk to WM is assigned to the k-th TN BS group. In other words, the resource parts, Wk+Wk+1+. . . +WM, are assigned to the k-th TN BS group, where 1≤k≤M.
At 752 and 754, the controller 710 can send reference signal (RS) configuration information to the TN BS 730 and the satellite 740. Then, the satellite 740 generates a reference signal based on the RS configuration information, and sends it at 756 to the TN BS 730. The TN BS can measure the reference signal based on the RS configuration information and report the measurement results at 758 to the server 720.
At 762, the controller 710 can send request messages to the server 720 and the satellite 740 to obtain information. At 766 and 768, the server 720 and the satellite 740 can respond to the controller 710 by sending response messages carrying the requested information. For example, the information sent at 766 can be the satellite reference signal measured at the TN BS 730, while the information sent at 768 can be the received RSRP at the satellite 740 from each NTN UE (not shown in
At 772, the controller 710 can decide how to allocate the radio resources by grouping the NTN UEs, partitioning the radio resources, grouping the TN BSs, and assigning the radio resources between the NTN UEs and TN BSs. As described earlier, the NTN UEs in each NTN beam can be divided into (M-1) groups. The radio resources can be partitioned into M non-overlapping parts. The TN BSs in the satellite's coverage can be divided into M groups. The k-th part of the radio resources can be allocated to the k-th NTN UE group, where k ranges from 1 to M-1. The sum of the (k-th to M-th) radio resources to the kth TN BS group, where k ranges from 1 to M.
At 782 and 784, the controller 710 can transmit the resource allocation results to the TN BS 730 and the satellite 740 for implementation.
At 852 and 854, the controller 810 can send reference signal (RS) configuration information to the TN BS 840 and the satellite 850. The satellite 850 can forward the received RS configuration information at 856 to the NTN UE 830. The TN BS 840 can generate a reference signal based on the RS configuration information, and sends it at 858 to the NTN UE 830. The NTN UE 830 can measure the reference signal based on the RS configuration information and report the measurement results at 860 to the satellite 850. At 862, the satellite 850 can send the measurement results received from the NTN UE 830, together with a measured satellite reference signal at the NTN UE 830 (or a measured NTN UE reference signal at the satellite 850), to the server 820.
At 872, the controller 810 can request the required information from the server 820 by sending a request message. At 874, the server 820 can respond to the controller 810 by sending a response message carrying the required information. In the embodiment shown in
At 882, the controller 810 can decide how to allocate the radio resources by grouping the NTN UEs, partitioning the radio resources, grouping the TN BSs, and assigning the radio resources between the NTN UEs and TN BSs. At 892 and 894, the controller 810 can transmit the resource allocation results to the TN BS 840 and the satellite 850 for implementation.
At 952 and 954, the controller 910 can send reference signal (RS) configuration information to the TN BS 940 and the satellite 950. The satellite 950 can forward the received RS configuration information at 956 to the NTN UE 930. The NTN UE 930 can generate a reference signal based on the RS configuration information, and sends it at 958 to the TN BS 940. The TN BS 940 can measure the reference signal based on the RS configuration information and report the measurement results at 960 to the server 920.
At 972 and 974, the controller 910 can request the required information from the server 920 and the satellite 950 by sending request messages. At 976 and 978, the server 920 and the satellite 950 can respond to the controller 910 by sending response messages carrying the required information. For example, the information sent at 976 can be the NTN UE reference signal measured at the NT BS 940, while the information sent at 978 can be the received RSRP at the satellite 950 from the NTN UE 930.
At 982, the controller 910 can decide how to allocate the radio resources by grouping the NTN UEs, partitioning the radio resources, grouping the TN BSs, and assigning the radio resources between the NTN UEs and TN BSs. At 992 and 994, the controller 910 can transmit the resource allocation results to the TN BS 940 and the satellite 950 for implementation.
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.
The present application claims priority to U.S. Provisional Application No. 63/370,132, entitled “A method of group-based radio resource allocation between a TN and an NTN networks,” filed on Aug. 2, 2022. The U.S. Provisional Application is incorporated herein by reference in its entirety.
Number | Date | Country | |
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63370132 | Aug 2022 | US |