Spectrum resource sharing method, base station and computer readable storage medium

Abstract

Embodiments of the present application disclose a spectrum resource sharing method, a base station and a computer readable storage medium, which are used to improve the utilization of spectrum resources in a frequency division duplex spectrum sharing scenario. The method of the embodiments of the present application comprises the following steps: a base station acquires the number of radio resource control (RRC) connected users of an LTE cell; when the number of RRC connected users is equal to 0, the base station punches the PCFICH and PHICH occupied by the LTE system in a subframe, and maps the downlink service data of the NR system to the first target RE in the subframe, wherein the first target RE is an RE in symbol 0 of the subframe which is not occupied by the reference channel of the LTE system.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a spectrum resource sharing method, a base station, and a computer-readable storage medium. Background Technology

[0002] Frequency-division duplexing (FDD) and dynamic spectrum sharing (DSS) is a technology that allows fifth-generation (5G) mobile communication (New Radio, NR) and fourth-generation (4G) mobile communication (Long Term Evolution, LTE) technologies to share the same spectrum resources for deploying NR and LTE networks. Due to scarce spectrum resources, some operators cannot independently deploy 5G networks. Furthermore, in the early stages of 5G deployment, the penetration rate of 5G-enabled terminals is low, and deploying 5G networks independently would result in low spectrum resource utilization efficiency, leading to high investment but low returns. FDD DSS utilizes existing LTE spectrum to deploy 5G networks, helping operators achieve rapid 5G network deployment at low cost and enhance their brand competitiveness.

[0003] During the deployment of FDD DSS spectrum, the physical channels of LTE and NR need to avoid collisions, and LTE and NR will transmit their respective fixed channels on the same spectrum. Compared with the NR ONLY network of the same spectrum bandwidth, the NR DSS network introduces additional spectrum resource overhead for the LTE cell reference signal (CRS), physical downlink control channel (PDCCH), and LTE system messages. This results in the NR DSS network having lower total available spectrum resources than the NR ONLY network of the same bandwidth, and the peak throughput of the NR DSS network is lower than that of the NR ONLY network. Summary of the Invention

[0004] This application provides a spectrum resource sharing method, a base station, and a computer-readable storage medium to address the problem of low spectrum resource utilization in FDD spectrum sharing scenarios in related technologies.

[0005] The first aspect of this application provides a spectrum resource sharing method, which includes: a base station acquiring the number of connected users in the Radio Resource Control (RRC) state of an LTE cell; when the number of connected users in the RRC state is equal to 0, the base station punches holes in the PCFICH and PHICH occupied by the LTE system on symbol 0 in the subframe to release the resource units occupied by the PCFICH and PHICH, and maps the downlink service data of the NR system to a first target resource unit (RE) in the subframe, where the first target RE is an RE in symbol 0 of the subframe that is not occupied by the reference channel of the LTE system. By releasing the time-frequency resources on symbol 0 occupied by the LTE system in the subframe to the NR system to transmit downlink service data when the number of connected users in the RRC state of the LTE cell is 0, the utilization rate of spectrum resources is improved, thereby increasing the peak throughput of the NR DSS.

[0006] In some possible implementations, the LTE system is configured with 4 antenna ports. The method also includes: the base station mapping downlink service data to a second target RE in the subframe, where the second target RE is an unoccupied RE in symbol 1 of the subframe's reference channel. When the LTE system still occupies resource elements on symbol 1 but there is no actual need for their use, the portion of time-frequency resources occupied by the LTE system on symbol 1 can also be relinquished to the NR system, further improving spectrum resource utilization.

[0007] In some possible implementations, the LTE system is configured with 4 antenna ports. The method further includes: when the number of RRC connected users is not equal to 0, the base station obtains the value of the LTE system's Control Format Indicator (CFI); when the CFI value is 1, the base station maps downlink service data to a third target RE in the subframe, where the third target RE is the RE in symbol 1 of the subframe that is not occupied by the LTE system's channel. A CFI value of 1 indicates that the LTE system does not need or use some of the time-frequency resources on symbol 1, and therefore the unused spectrum resources on symbol 1 can be released to the NR system.

[0008] In some possible implementations, the method also includes: the base station determining the target symbol occupied by the control channel of the NR system based on the number of antenna ports of the LTE system; and the base station performing rate matching processing on the downlink service data to avoid REs in the target symbol.

[0009] In some possible implementations, the subframe can be an MBSFN subframe or a non-MBSFN subframe.

[0010] A second aspect of this application also provides a base station, which includes: an acquisition module for acquiring the number of RRC connected users in an LTE cell; and a mapping module for, when the number of RRC connected users is equal to 0, punching holes in the PCFICH and PHICH occupied by the LTE system in the subframe, and mapping downlink service data of the NR system to a first target RE in the subframe, wherein the first target RE is a RE of symbol 0 in the subframe that is not occupied by the reference channel of the LTE system.

[0011] In some possible implementations, the LTE system is configured with 4 antenna ports, and the mapping module is also used to: map downlink service data to a second target RE in the subframe, where the second target RE is a RE of symbol 1 in the subframe that is not occupied by the reference channel of the LTE system.

[0012] In some possible implementations, the LTE system is configured with 4 antenna ports. The acquisition module is also used to acquire the value of the LTE system's Control Format Indicator (CFI) when the number of RRC connected users is not equal to 0. The mapping module is also used to map downlink service data to the third target RE in the subframe when the value of CFI is 1. The third target RE is the RE of symbol 1 in the subframe that is not occupied by the LTE system's channel.

[0013] In some possible implementations, the base station also includes: a determination module for determining the target symbol occupied by the control channel of the NR system based on the number of antenna ports of the LTE system; and a rate matching module for performing rate matching processing on the downlink service data to avoid REs in the target symbol.

[0014] In some possible implementations, the subframe can be an MBSFN subframe or a non-MBSFN subframe.

[0015] A third aspect of this application also provides a base station, the base station including a memory; and a processor coupled to the memory, the processor being configured to execute a spectrum resource sharing method as described in the first aspect and any possible implementation thereof based on instructions stored in the memory device.

[0016] A fourth aspect of this application also provides a computer-readable storage medium including instructions that, when the computer-readable storage medium is run on a base station, cause the base station to perform a spectrum resource sharing method as described in the first aspect and any possible implementation thereof. Attached Figure Description

[0017] Figure 1 A schematic diagram of the communication system provided in this application;

[0018] Figure 2 A flowchart illustrating an embodiment of the spectrum resource sharing method provided in this application;

[0019] Figure 3 This is a time-frequency resource mapping diagram for a resource block within a subframe when the number of RCC connected users is 0 and the LTE antenna port is 1 or 2.

[0020] Figure 4 A schematic diagram of time-frequency resource mapping for a resource block within a subframe when the number of RCC connected users is 0 and the number of LTE antenna ports is 4;

[0021] Figure 5 This is a schematic diagram of resource mapping for a subframe when the LTE antenna port is 4 and CFI is 1, as provided in this application.

[0022] Figure 6 A schematic diagram of the structure of an embodiment of the base station provided in this application;

[0023] Figure 7 A schematic diagram of another embodiment of the base station provided in this application. Detailed Implementation

[0024] This application provides a spectrum resource sharing method, a base station, and a computer-readable storage medium to improve the utilization rate of spectrum resources in frequency division duplex spectrum sharing scenarios.

[0025] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0026] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] The embodiments of this application can be applied to communication systems, such as... Figure 1 As shown, Figure 1This is a schematic diagram of the communication system provided in this application. The communication system includes a base station and terminals. The terminals are user equipment that communicate with the base station, including 4G terminals and 5G terminals, corresponding to the terminals of the target LTE cell and the target NR cell in the embodiments of this application. The base station is a dual-mode base station, one for LTE and the other for NR. The spectrum used by the LTE system and the NR system partially or completely overlaps. The base station contains at least one LTE cell and at least one NR cell, and the number of LTE cells is the same as the number of NR cells.

[0028] The subcarrier spacing in NR and LTE systems is equal, such as 15kHz. This ensures the subcarriers are orthogonal, reducing interference between them. The OFDM symbol lengths for the subcarriers in NR and LTE systems are also equal, such as one-seventh of a millisecond for both OFDM symbols. Alternatively, the subcarrier spacing can also be equal. In this case, a guard interval must be reserved between the NR and LTE systems to further reduce interference.

[0029] In addition, the cyclic prefix (CP) length of the subcarriers in the NR system and the LTE system is the same. The cyclic prefix refers to the prefix added before the OFDM symbol enters the channel, which is used to fill the guard interval.

[0030] like Figure 2 As shown, Figure 2 This is a flowchart illustrating an embodiment of the spectrum resource sharing method provided in this application. The executing entity in this embodiment is a base station, and the embodiment includes the following steps:

[0031] S201: The base station obtains the number of RRC connected users in the LTE cell.

[0032] When a user terminal is in Radio Resource Control (RRC) connected state, it indicates that the user terminal is operating services with the base station. The base station obtains the number of RRC connected users in the LTE cell and can determine the LTE cell's spectrum requirements based on this number.

[0033] S202: When the number of RRC connected users is equal to 0, the base station will punch holes in the PCFICH and PHICH occupied by the LTE system in the subframe, and map the downlink service data of the NR system to the first destination element (RE) in the subframe.

[0034] The Physical Control Format Indicator Channel (PCFICH) indicates the location of control information. PCFICH is a channel strongly correlated with OFDM characteristics in the LTE system, carrying the location information of the control channel within the OFDM symbols. The Physical Hybrid Automatic Repeat Request (HARQ) Indicator Channel (PHICH) carries acknowledgment / non-deterministic (ACK / NACK) information for hybrid automatic repeat requests (HARQs).

[0035] The first target resource element (RE) is the RE in the subframe whose symbol 0 is not occupied by the LTE system's reference channel, including REs occupied by PCFICH, PHICH, and physical downlink control channel (PDCCH). The subframe can be a multicast / broadcast single frequency network (MBSFN) subframe or a non-MBSFN subframe. MBSFN subframes do not need to transmit CRS; only 1-2 symbols are needed to transmit PCFICH, PHICH, and PDCCH. Therefore, the scheme of this application is also applicable to MBSFN subframes, thus ensuring that time-frequency resources in different types of subframes can be fully and effectively utilized.

[0036] If the number of connected users in an LTE cell is 0, it means that there are no users in the current LTE cell that need to transmit data. In other words, the spectrum resources occupied by the LTE system control channel will not be used. Therefore, the control channel occupied by the LTE system in the subframe can be given to the NR system.

[0037] Specifically, since PCFICH and PHICH are typically mapped to resource elements corresponding to symbol 0 of a subframe, the base station performs puncturing on the PCFICH and PHICH used by the LTE system to free up the spectrum resources occupied by PCFICH and PHICH on symbol 0. Because the cell reference signal (CRS) in the LTE system is transmitted discretely across the entire system bandwidth, the CRS is transmitted across the full bandwidth regardless of whether any users are receiving downlink data in the LTE cell. The NR system needs to avoid the CRS. Therefore, the base station can further allocate REs on symbol 0 (excluding those occupied by the LTE system's CRS, including the REs occupied by the punctured PCFICH and PHICH) to the NR system, thereby improving spectrum resource utilization and ultimately increasing the peak throughput of the NR DSS.

[0038] The LTE system can be configured with 1, 2, or 4 antenna ports. When the LTE system is configured with 1 or 2 antenna ports, the LTE control channel occupies the RE on subframe symbol 0; when the LTE system is configured with 4 antenna ports, the LTE control channel occupies the REs on subframe symbols 0 and 1. Therefore, compared to 1 and 2 antenna ports, when the LTE system is configured with 4 antenna ports and the number of RRC connected users in the LTE cell is 0, the base station can also map downlink service data from the NR system to the RE not occupied by the LTE system's CRS in subframe symbol 1, i.e., the second target RE. Specifically, the second target RE is, for example, the RE occupied by the LTE system's PDCCH on symbol 1.

[0039] For example, such as Figure 3 As shown, Figure 3 This diagram illustrates the time-frequency resource mapping for a resource block within a subframe when the number of RCC connected users is 0 and the LTE antenna port is 1 or 2. It is understood that the position and number of CRS channels in the accompanying drawings of this application are merely examples and not intended to limit this application. When the LTE antenna port is 1 or 2, the LTE system occupies symbol 0 as the control channel, the NR system occupies symbol 1 as the control channel, and symbols 2 to 13 are used as downlink service channels for the NR system. Since the number of RCC connected users is 0, all REs on symbol 0 except those occupied by the LTE system's CRS are unused. Therefore, the REs occupied by PCFICH and PHICH on symbol 0 can be used by the NR system to transmit downlink service data.

[0040] like Figure 4 As shown, Figure 4This diagram illustrates the time-frequency resource mapping for a resource block within a subframe when the number of RCC connected users is 0 and the LTE antenna ports are 4. With 4 LTE antenna ports, the LTE system uses symbols 0 and 1 as control channels, the NR system uses symbol 2 as a control channel, and symbols 3 to 13 are used as downlink service channels for the NR system. Since the number of RCC connected users is 0, all REs on symbols 0 and 1 except those occupied by the LTE system's CRS are unused. Therefore, in addition to allocating the REs occupied by PCFICH and PHICH on symbol 0 to the NR system for downlink service data transmission, the REs on symbol 1 not occupied by the LTE system's CRS can also be yielded to the NR system for downlink service data transmission.

[0041] When the LTE system is configured with 4 antenna ports, but the number of RCC connected users is not zero, the base station further obtains the value of the LTE system's control format indicator (CFI). The CFI indicates the number of symbols occupied by the LTE system's control channel. When the CFI value is 1, it means that the LTE system needs to occupy one symbol, i.e., symbol 0, as the control channel. Since some REs on symbol 1 will not be used by the LTE system, the base station can map downlink service data to the third target RE in the subframe. The third target RE is the RE on symbol 1 in the subframe that is not occupied by the LTE system's channel; that is, the third target RE is the RE on symbol 1 that is not occupied by the LTE system's reference signal and downlink service data.

[0042] For example, such as Figure 5 As shown, Figure 5 This is a resource mapping diagram for a subframe with 4 LTE antenna ports and CFI of 1, as provided in this application. The LTE system occupies symbol 0 as the control channel and uses some REs on symbols 1 to 13 to transmit LTE downlink service data. The NR system occupies some REs on symbol 3 as the control channel and uses some REs on symbols 4 to 13 to transmit NR downlink service data. Since the remaining REs on symbol 1 (REs not occupied by the LTE system's reference signal and downlink service data) are idle, these idle REs on symbol 1 can be used as third target REs to transmit NR downlink service data.

[0043] Generally, service channels are mapped to symbols following the symbols occupied by the control channel. However, since the NR downlink service data in this application is mapped to REs preceding the NR control channel, the NR downlink service data needs to avoid the NR control channel. Specifically, the base station determines the target symbol occupied by the NR system's control channel based on the number of antenna ports in the LTE system. For example, when there are 1 or 2 LTE antenna ports, the NR system's control channel occupies symbol 1, and the target symbol is 1; when there are 4 LTE antenna ports, the NR system's control channel occupies symbol 2, and the target symbol is 2. The base station performs symbol-RB level rate matching processing on the downlink service data so that the NR system knows which REs cannot be used for NR data scheduling on the downlink service data, thus avoiding REs in the target symbol.

[0044] In this embodiment, when the base station confirms that the control channel in the symbol occupied by the LTE system is not fully utilized, it schedules the idle REs in the symbol to send NR downlink service data, thereby improving the spectrum resource utilization rate in the dynamic spectrum sharing scenario of LTE and NR, and thus improving the throughput of downlink service data of the NR system.

[0045] To verify the beneficial effects of the embodiments of this application, tests were conducted based on the above embodiments: NR downlink peak throughput was tested in a 20M bandwidth DSS scenario with no RRC connected users in the LTE cell. Test results: In the baseline FDD DSS scenario (without using the technical solution of this application), the measured NR DSS downlink peak throughput was 321.1 Mbit / s. After using the bearer function of this invention, the measured NR DSS downlink peak throughput was 366.53 Mbit / s, a gain of 14.1%.

[0046] The technical solution provided in this application can reduce the fixed overhead of LTE PDCCH to NR DSS, and the maximum reduction in overhead is shown in the table below:

[0047]

[0048] like Figure 6 As shown, Figure 6 A schematic diagram of a structure of a base station provided in this application. The base station 600 includes:

[0049] The acquisition module 601 is used to acquire the number of RRC connected users in an LTE cell.

[0050] The mapping module 602 is used to punch the PCFICH and PHICH occupied by the LTE system in the subframe when the number of RRC connected users is equal to 0, and to map the downlink service data of the NR system to the first target RE in the subframe. The first target RE is the RE of symbol 0 in the subframe that is not occupied by the reference channel of the LTE system.

[0051] Optionally, the LTE system is configured with 4 antenna ports, and the mapping module 602 is also used to map downlink service data to a second target RE in the subframe, where the second target RE is an RE of symbol 1 in the subframe that is not occupied by the reference channel of the LTE system.

[0052] Optionally, the LTE system is configured with 4 antenna ports. The acquisition module 601 is also used to acquire the value of the control format indicator (CFI) of the LTE system when the number of users in the RRC connected state is not equal to 0. The mapping module 602 is also used to map the downlink service data to the third target RE in the subframe when the value of CFI is 1. The third target RE is the RE of symbol 1 in the subframe that is not occupied by the channel of the LTE system.

[0053] Optionally, the base station also includes a determination module 603, used to determine the target symbol occupied by the control channel of the NR system based on the number of antenna ports of the LTE system; and a rate matching module 604, used to perform rate matching processing on the downlink service data to avoid REs in the target symbol.

[0054] In this embodiment, the subframe is either an MBSFN subframe or a non-MBSFN subframe.

[0055] This application also provides a base station. Figure 7 The schematic diagram of another embodiment of the base station provided in this application shows that the base station 700 includes: a memory 701 and a processor 702 coupled to the memory 701. The processor 702 is configured to execute the spectrum resource sharing method in any embodiment of the present invention based on instructions stored in the memory 701.

[0056] The memory 701 may include, for example, system memory, fixed non-volatile storage media, etc. The system memory may store, for example, an operating system, application programs, a boot loader, a database, and other programs.

[0057] This application also relates to a computer storage medium for storing computer software instructions used for the base station, including instructions for executing programs designed for the base station.

[0058] The base station can be as follows Figure 6 or Figure 7 The base station described.

[0059] This application also relates to a computer program product, which includes computer software instructions that can be loaded by a processor to implement the above-mentioned features. Figure 2 The process in the illustrated embodiment.

[0060] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0061] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0062] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0063] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0064] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

Claims

1. A method of spectrum resource sharing, the method comprising: The method comprises: The base station acquires the number of radio resource control (RRC) connected users of a long term evolution (LTE) cell; When the number of RRC connected users is equal to 0, the base station punches the physical control format indicator channel (PCFICH) and the physical hybrid automatic repeat request indicator channel (PHICH) occupied by the LTE system in a subframe, and maps the downlink service data of a new radio (NR) system to a first target resource element (RE) in the subframe, the first target RE being an RE in symbol 0 of the subframe that is not occupied by a reference channel of the LTE system, and the first target RE including an RE occupied by the PCFICH, an RE occupied by the PHICH, and an RE occupied by a physical downlink control channel.

2. The method of claim 1, wherein, The LTE system is configured as 4 antenna ports, and the method further comprises: The base station maps the downlink service data to a second target RE in the subframe, the second target RE being an RE in symbol 1 of the subframe that is not occupied by the reference channel of the LTE system.

3. The method of claim 1, wherein, The LTE system is configured as 4 antenna ports, and the method further comprises: When the number of RRC connected users is not equal to 0, the base station acquires a value of a control format indicator (CFI) of the LTE system; When the value of the CFI is 1, the base station maps the downlink service data to a third target RE in the subframe, the third target RE being an RE in symbol 1 of the subframe that is not occupied by a channel of the LTE system.

4. The method according to any one of claims 1 to 3, characterized in that, The method further comprises: The base station determines a target symbol occupied by a control channel of the NR system according to the number of antenna ports of the LTE system; The base station performs rate matching processing on the downlink service data to avoid the REs in the target symbol.

5. The method according to any one of claims 1 to 3, characterized in that, The subframe is an MBSFN subframe or a non-MBSFN subframe.

6. A base station, characterized by The base station comprises: An acquisition module configured to acquire the number of RRC connected users of an LTE cell; A mapping module configured to, when the number of RRC connected users is equal to 0, punch the PCFICH and the PHICH occupied by the LTE system in a subframe, and map the downlink service data of an NR system to a first target RE in the subframe, the first target RE being an RE in symbol 0 of the subframe that is not occupied by a reference channel of the LTE system, and the first target RE including an RE occupied by the PCFICH, an RE occupied by the PHICH, and an RE occupied by a physical downlink control channel.

7. The base station of claim 6, characterized in that The LTE system is configured as 4 antenna ports, and the mapping module is further configured to map the downlink service data to a second target RE in the subframe, the second target RE being an RE in symbol 1 of the subframe that is not occupied by the reference channel of the LTE system.

8. The base station of claim 6, wherein, The LTE system is configured as 4 antenna ports, The acquisition module is further configured to, when the number of RRC connected users is not equal to 0, acquire a value of a control format indicator (CFI) of the LTE system; When the value of the CFI is 1, the base station maps the downlink service data to a third target RE in the subframe, the third target RE being an RE in symbol 1 of the subframe that is not occupied by a channel of the LTE system. The mapping module is further configured to map the downlink service data to a third target RE in the subframe when the value of the CFI is 1, the third target RE being an RE in symbol 1 of the subframe that is not occupied by a channel of the LTE system.

9. The base station of any one of claims 6 to 8, characterized in that, The base station further includes: a determining module configured to determine a target symbol occupied by a control channel of the NR system according to a number of antenna ports of the LTE system; a rate matching module configured to perform rate matching processing on the downlink service data to avoid the REs in the target symbol.

10. The base station of any one of claims 6 to 8, characterized in that, The subframe is an MBSFN subframe or a non-MBSFN subframe.

11. A base station, characterized by The base station includes a memory; and a processor coupled to the memory, the processor configured to perform the spectrum resource sharing method of any one of claims 1-5 based on instructions stored in the memory device.

12. A computer-readable storage medium, characterized in that, comprising instructions that, when executed on a base station, cause the base station to perform the spectrum resource sharing method of any one of claims 1-5.

Images